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Old Dec 06, 2008, 02:38 PM
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Mini-Review
BAe Hawk by e-flite

I started working on my E-flite Hawk,

http://e-fliterc.com/Products/Defaul...ProdID=EFL8025

which I picked up for $139 at Ultimate Hobbies in Orange CA (they had several on the shelf),

http://www.ultimatehobbies.com/istar...epage.template

It's a really nice model ... the fuse is lightweight molded fg, and the wings and tail surfaces balsa covered in polyester film.

There's a nice video of the Hawk on the above site, flying on a 3S setup:

http://e-fliterc.com/ProdInfo/Files/EFL8025_hi.wmv

The model is quite similar in design to other OK-Model models http://www.okmodel.co.jp/, and has similar features (like the swiss cheese fuse bottom) : http://www.rcgroups.com/forums/showt...=775006&pp=100 [MiG-15], http://www.rcuniverse.com/magazine/a...rticle_id=1001 [L-39] and http://www.okmodel.co.jp/shincyaku/A...4-skyhawk.html [A-4].

Looking at the specs one will see that it's a rather small model, the fuse is big but the wings are tiny. Just as the original. Luckily it is designed around a 69mm fan:

Wingspan: 33.3 in (845mm)
Overall Length: 35.4 in (900mm)
Wing Area: 206 sq in (13.2 sq dm)
Flying Weight: 4346 oz (12191304 g)
Motor Size: 15 DF Brushless Motor
Radio: 4+ channels
Servos: Sub Micro (3 required, 4 with nose gear steering)
Speed Control : 60 amp brushless
Recommended Battery: 3S 11.1V 3000-3300mAh Li-Po
Landing Gear: Optional use, included


Clearly it is meant more as a semi-scale-looking design, and not so much as a speed daemon (there's other models for that).

But hey with Steve C around who knows ?


.
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Old Dec 06, 2008, 03:06 PM
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It is embarassingly easy to put the main components of this arf together to see how it looks

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Old Dec 06, 2008, 03:17 PM
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The 69mm fan slides in from the side - I suppose any half decent 69mm fan will do, but I am using a WeMoTec MiniFan I already have ...

E-flite on their web page has a recommended e-flite fan with a nice inrunner with a kv of 3700. That would mean the one in the video is flying on 3S with about 360W.

I plan to use a Mega 16 or similar on 3S, for around 600W. If I can get a hold of a NeuMotor 1100/2d I might try that instead.

.
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Old Dec 06, 2008, 03:26 PM
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The various parts & componets are generally lightweight, the fiberglass fuse weighs around 437g, and the built up wings around 142g.

So the empty airframe weight is around 585g...

.
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Old Dec 06, 2008, 03:34 PM
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There's plenty of room in the front for different size 3S packs.

The only thing in the way, possibly, are the elevator/steering servos mounted on one side of the tray.

.
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Old Dec 06, 2008, 03:41 PM
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Quote:
Originally Posted by Herb
Clearly it is meant more as a scale looking design, and not so much as a speed daemon (there's other models for that). But hey with Steve C around who knows ?


.


I'd have one on the way if I could afford it. My Jepe F-16 needs new batteries that I need to save up for and I'm working on revamping my F-86 with a more scale canopy (like clear!) and access hatch.

It's so nice to see a model for sale that really looks scale. It's just a shame they don't know better than to put all of those holes in the bottom of it now that I know you can fly most subjects with just the scale inlets.

Please let us know what you think of it after it flies. I'm curious how the Minifan will like it with no inlet ducting.

Steve C
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Old Dec 06, 2008, 03:43 PM
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Other details such as the fan mounting ring and the elevator linkage setup,

.
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Old Dec 06, 2008, 03:51 PM
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Swiss cheese bottom - the price you pay on this one for having a close to scale inlet. But then again, there's always the AirSally solution

Somewhat worrysome is the lack of even an inlet ring on the fan mount.

.
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Old Dec 06, 2008, 04:02 PM
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Quote:
Originally Posted by Steve C
... It's so nice to see a model for sale that really looks scale. It's just a shame they don't know better than to put all of those holes in the bottom of it ...
It definitely looks like a Hawk ... A smaller fan could work with those inlets I suppose, but one should keep in mind that the Hawk will always remain a somewhat draggy airframe due to the proportionately large fuselage.

My plan is to keep it light and agile. We shall see.
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Old Dec 06, 2008, 04:30 PM
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polyester resin or epoxy resin fuselage?
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Old Dec 06, 2008, 05:29 PM
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Quote:
Originally Posted by Herb
Swiss cheese bottom - the price you pay on this one for having a close to scale inlet. But then again, there's always the AirSally solution

Somewhat worrysome is the lack of even an inlet ring on the fan mount.

.
Herb,

Inlet ring is already in the airplane. It's the black ring you can see in several of your photos.

David
Horizon
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Old Dec 06, 2008, 07:27 PM
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the wemotec fit perfectly inside the plane ?
what motor you have ?Typhoon EDF-2W 450W ?
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Old Dec 06, 2008, 09:02 PM
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Quote:
Originally Posted by Herb
It definitely looks like a Hawk ... A smaller fan could work with those inlets I suppose,
Have faith my friend. Those inlets could work with the right ducts.

Steve C
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Old Dec 06, 2008, 11:47 PM
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Quote:
Originally Posted by Socomon
polyester resin or epoxy resin fuselage?
That is a good question. It looks like fiberglass resin to me.
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Old Dec 06, 2008, 11:49 PM
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Quote:
Originally Posted by Dave Eichstedt
Herb, Inlet ring is already in the airplane. It's the black ring you can see in several of your photos. David Horizon
Yes I noticed But it looks smallish compared to the standard WeMoTec inlet ring and some other intake rings I am used too. But then maybe it works fine - we shall see.
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Old Dec 06, 2008, 11:50 PM
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Quote:
Originally Posted by Helicoy
the wemotec fit perfectly inside the plane ?
what motor you have ?Typhoon EDF-2W 450W ?
Well it's designed for a 69mm fan (good choice btw) so the Wemotec MiniFan fits. Other 69mm fans should fit too, maybe with some slight sanding, or an adapter.
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Old Dec 06, 2008, 11:54 PM
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Originally Posted by Steve C
Have faith my friend. Those inlets could work with the right ducts. Steve C
I am listening ... Yes some duct work might be interesting. The front ply tray has to come out and then the fun can start.

What kind of surprised me some time ago is how well the Kyosho Illusion flies without any sort of half-decent ducting. Of course there the sleek airframe has something to do with it as well.
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Old Dec 07, 2008, 12:17 AM
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I tried to fix up a foam sapac foam Hawk that a guy at my field threw in the trashcan after the maiden. It took me a week just to recover the wing from another guy .

It was an uphill battle getting it to fly right though. I tried to make some simple foam ducting for it ... This one is so much nicer.

.
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Old Dec 07, 2008, 12:21 AM
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Gordon and I and I am sure a few others flew the Gloeckner Hawk for the MiniFan a few years ago, that was a fast one

It was a very nice design but not quite scale ...

.
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Old Dec 07, 2008, 01:58 PM
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Unfortunately I don't have an un-employed edf motor of the right wind for the MiniFan at this time, so I am ordering a 110g arc 28-47-1

http://www.rcgroups.com/forums/showp...72&postcount=1

with a kv=4250, Io=2.5A and Rm=0.009 Ohm (and thus a calculated eff. in the mid-upper-80 %'s), see eg here:

http://www.rcgroups.com/forums/showt...77#post7333577

On a good pack this should give somewhere between 520W and 600W on 3S,

http://www.s4a.ch/eflight/fancalc.htm

There'a a bunch of guys at my field flying these arc motors as replacements for burned up medusas, and they seem to hold up much better, very rugged. Ok maybe not 120% efficiency like the newer alien technology motors
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Old Dec 08, 2008, 11:17 AM
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Quote:
Originally Posted by Helicoy
the wemotec fit perfectly inside the plane ?
what motor you have ?Typhoon EDF-2W 450W ?
After some more testing I went the simplest route and used the MiniFan with the Het 2W I already had, after a bearing swap.

If you keep the mounting tabs on the Minifan, it should bolt right in. That is how I mounted mine. It should be easy to swap motor later if needed....

I have rarely seen kits as well made as this one . Even the wheels are so nice I feel bad to use them.

.
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Old Dec 08, 2008, 12:26 PM
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Quote:
Originally Posted by Steve C
Have faith my friend. Those inlets could work with the right ducts. Steve C
I measured the combined area of the two Hawk intakes yesterday, and they are 22.40 sq cm, or around 76% of the MiniFan fsa.

The outlet is limited by the diameter of the fg fuse end at 55 mm, or 23.76 sq cm which is a normal 80% fsa for the MiniFan ...

So the intakes should work just fine with ducting, at least in principle. Whether it's worth all the work is another - personal - question ...

.
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Old Dec 08, 2008, 03:11 PM
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Anyone dare to comment why E-Flite didn't make this plane retract ready?
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Old Dec 08, 2008, 03:17 PM
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a) size of plane (look at the pic of the wing)

b) cost, assembly & manufacturing simplicity issues ,

c) lack of reliable suitably sized small pneumatic retracts at reasonable cost (eg airpower ).
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Old Dec 08, 2008, 04:22 PM
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Anyone dare to comment why E-Flite didn't make this plane retract ready?
Wing thickness and weight.
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Old Dec 08, 2008, 05:31 PM
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Its really small. I seen it at the I-hobby show in October. The sapac hawk is MUCH nicer!!! This one aint bad looking, but no ducting and no retracts kinda stinks. But then again it is small. Just look at these new color schemes. Very nice and they now include full ducting and retracts are installable.
Red arrows
http://www.rc-warbirds.com/product_i...roducts_id/712

Blue version

http://www.rc-warbirds.com/product_i...roducts_id/764

T-45
http://www.rc-warbirds.com/product_i...roducts_id/711
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Old Dec 09, 2008, 05:07 AM
Julian T
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I am picking one of these up today. I am not a fan of fixed u/c and generally consider 70mm EDFs a bit small for retracts. So I am going bungee and belly flop. Is there a recommended position for the hook - I have found it varies widely and is critical for a successful launch every time. My Het Sniper has it fairly well back while my OK Models Mig 15 needed it way forward from where the manufacturer put it.

Julian
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Old Dec 09, 2008, 07:53 AM
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Looks like the cheese grater style cheater holes will slice the grass and dirt even better than a regular cheater hole on a belly landing...

...bit of a tongue twister that...cheese grater style cheater...ha ha
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Old Dec 09, 2008, 08:12 AM
Julian T
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I thought that with my Mig but it never proved to be a problem. But there are rather a lot of them...
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Old Dec 09, 2008, 01:25 PM
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Quote:
Originally Posted by juliant
... I am going bungee and belly flop. Is there a recommended position for the hook ... Julian
About half-way between CG and nose tip should work fine.

Points to consider are a) the ultracoat on the wing bottoms, and servo linkages might get scraped (use a smoke oil pod under fuse?) and as said b) the swiss cheese intakes might scrape up quite a bit of fod.
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Old Dec 09, 2008, 01:30 PM
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Incidentally among the 69mm fan models, this is one on the small side (see wing aera for ex).

I would imagine that it's direct market competition are the $200 fly and dent foamies. Up against those I think there' no comparison

For those who require a scale masterpiece Hawk for under $149 I would suggest the Graupner one:

http://www.motorsandrotors.com/Produ...oming_soon.htm
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Old Dec 09, 2008, 02:38 PM
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Wow, thats a spendy thing.

I will stick with my composite hawk
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Old Dec 09, 2008, 03:54 PM
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A relatively large fuse with a comparatively small wing, here next to my JePe F-16

.
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Old Dec 09, 2008, 03:57 PM
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I have found two pilots in my drawers, but they are bit on the small side

.
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Old Dec 09, 2008, 03:59 PM
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I should be flying her this weekend if the winds don't pick up

.
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Old Dec 09, 2008, 04:15 PM
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Quote:
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I have found two pilots in my drawers, but they are bit on the small side

.
errrr . . . I'm sorry you were disappointed with what you found in your drawers.
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Old Dec 09, 2008, 04:22 PM
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Quote:
Originally Posted by Herb
Incidentally among the 69mm fan models, this is one on the small side (see wing aera for ex).

I would imagine that it's direct market competition are the $200 fly and dent foamies. Up against those I think there' no comparison

For those who require a scale masterpiece Hawk for under $149 I would suggest the Graupner one:

http://www.motorsandrotors.com/Produ...oming_soon.htm
The SAPAC composite T-45 at 195.00 from turbofan electrics(they sell it without fan and motor) is certainly an option at this price point. It is 70mm, it is much bigger, and it does not have the cheese grater on the bottom. Of course it would not fly well on a 3s power system.
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Old Dec 09, 2008, 10:28 PM
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The fan mounting ring inside the fuselage is mounted at an angle in mine. When i install the eflite fan flush with the ring, it is angled ALOT! when it is in straight, the mounting ring inside the fuse is several mm's off. Frustrating to say the least. It is a pretty airplane, however!
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Old Dec 10, 2008, 12:18 AM
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Good luck on the maiden Herb. Looking forward to the rest of the review.
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Old Dec 10, 2008, 12:20 AM
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Mine's straight but : How the fan is mounted is important. When you look at it from the back, the fan has to blow air straight out, and that is what counts ...

Incidentally, I am not using the e-flite fan+motor since I already had the fan & motor, but that combination looks nice.

Yeah those pilots are $3 Dare ones that never got used for their intended purpose - they are itching for a flight
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Old Dec 10, 2008, 12:42 AM
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i am really thinking of geting this one and seeing what can be done with the ducts the fact that the motor/fan comes in from the back would make it easier to do duct that feed just the blades and not the spinner.Herb the wemo might be a great chioce for this as i think the E-flite fan has more FSA due to a smaller spinner/hub
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Old Dec 10, 2008, 12:56 AM
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Fan

I had the same problem with the fan not lining up correctly . i rotated the fan 180 and it fit perfect on mine. you will have to rotate the motor inside the fan also. good luck.
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Old Dec 10, 2008, 04:39 AM
Julian T
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Quote:
Originally Posted by Herb
About half-way between CG and nose tip should work fine.

Points to consider are a) the ultracoat on the wing bottoms, and servo linkages might get scraped (use a smoke oil pod under fuse?) and as said b) the swiss cheese intakes might scrape up quite a bit of fod.
Thanks Herb.

Julian
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Old Dec 10, 2008, 08:39 AM
deltas are cool
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the fan mounting tabs are not on Center line so yeah you need to have it in the right way or it will be off the thickness of the mounting tap 2 .080" -.100"
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Old Dec 10, 2008, 10:06 AM
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Hi guys, I ran up the eflite fan last night and was suprised how smooth it is..and very quiet also. I used a low charged 2100 and got 260 watts ,25 amps,9.9volts and 100 mph eflux. all with no exst cone just inlet ring. So it looks like it will make the stated numbers with no problem.next i will recharge all my batts and see what it will do on three and four cells. I think I will like this fan if it doesnt explode at higher rpm!
Scott
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Old Dec 10, 2008, 10:26 AM
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Well. what do ya know, I simply turned the fan around and its a perfect fit. The motor and fan are REALLY smooth. Thanks
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Old Dec 10, 2008, 10:54 AM
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Quote:
Originally Posted by AIR SALLY
i am really thinking of geting this one and seeing what can be done with the ducts the fact that the motor/fan comes in from the back would make it easier to do duct that feed just the blades and not the spinner.Herb the wemo might be a great chioce for this as i think the E-flite fan has more FSA due to a smaller spinner/hub
AS, I think I see you in every EDF thread. What EDF dont you own.
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Old Dec 10, 2008, 11:54 AM
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Quote:
Originally Posted by AIR SALLY
I am really thinking of geting this one and seeing what can be done with the ducts...
Hmm I see a set of nicely done lightweight ducts for the mini-Hawk in my future
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Old Dec 10, 2008, 12:30 PM
deltas are cool
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lith i dont have them all but i have parts for 4 of them now ...if turbo nut had pay pal i would get one and make ducts for it asap.
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Old Dec 10, 2008, 03:45 PM
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Ok Roger! Call me and lets see what we can do!
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Old Dec 10, 2008, 08:24 PM
SoCal, Year Round Flying!
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Picked one up today! It's purty!
Going with minifan and 2w-20 on 4S w/60A ESC.
At 1st glance it looks fairly easy to slightly enlarge the intake openings to 90% without undue loss of scale looks but maybe I'm wrong?
Hope you get one Roger, I'd like some artwork...I mean some ductwork!

Bruce
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Old Dec 10, 2008, 09:16 PM
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Quote:
Originally Posted by juliant
... So I am going bungee and belly flop. ... Julian
Consider adding a smoke pod to protect the bottom - it could be used as a grab device for handlaunching too:

.

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Old Dec 10, 2008, 09:29 PM
deltas are cool
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yeah i believe i'll get one ..i still think any ducting i do will need some aux naca type openings on the bottom of the ducts that could pull air from some of the openings on the bottom of plane.
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Old Dec 10, 2008, 09:53 PM
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Hope you do, shes really nice!
On the ducting, if we sand down the intakes closer or flush to the fuselage sides...thats a significant amount of added area.
That part is approx 3.5mm by 48mm per side.
And thats being conservative.
1.68 sq cm added to 22.40 = 24.08 sq cm
What would that do for the FSA Herb?
btw, what is the minifans FSA.
EDIT
searched around, Correct me if I'm wrong please.
minifan 100%FSA 4.5in or 29.03sq cm
90% 26.127sq cm
geezus I forgot to times 2 for both sides!= 3.36+22.40= 25.76 sq cm
cut back 4mmx48mm x 2 = 3.84 + 22.40 = 26.24 sq cm
We got our 90%!
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Old Dec 10, 2008, 10:11 PM
DELTAS RULE
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yeah, i saw the added flat ara on the inlets and was like..huh! i think its doable without any cheaters dad. if you get 90% your ready to rock. my alfa asbre only has 90% and its killer. all a cheater is going to do is disrupt airflow and cause turbulance, and loss in efficiently...that beeing the case just leave them along. i think trimming the inlets to beeing flush will give you enough area for the guys running 500+ watts.
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Old Dec 10, 2008, 10:23 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
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oh yeah i see what you are talking about....this looks doable i'm on it .i'll contact turbo nut tomarrow now if only the fans Joe order came in ...i want the duct to work with all the popular fans and the stock one this will make this thing really move out .i'll be sure to keep the duct out of he way of any Bigg batts you guys might throw at it.
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Old Dec 10, 2008, 10:52 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
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wish i could afford one! you should have bought those HET gear from me, they would be perfect for a little guy like this!
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Old Dec 10, 2008, 11:30 PM
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Cool! you'll have to make it in 2 pieces so it installs thru the cockpit though.
I'd say the join would be one side runner near the "V" merge. Think it would be an easy install then. Then I'd yank the stock fan intake lip out so the fan will butt up nicely against the ducting and.....yeah it'll work!
btw the stock fanlip appears to fit nicely with my minifan
AND there's a string thru the wing so you can easily pull the servo wires thru.
Nice touch there!
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Old Dec 10, 2008, 11:47 PM
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View of Hawk wing from the side ... I am having the aluminum side plates re-machined, or doubled up with jb weld - have to think about that.

.
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Old Dec 11, 2008, 12:25 AM
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Rodger I e-mailed scott at airland to see if I can get an order from him instead and have him send you two, one for c/n and one for you as promised. I need to wait and here back from him.
Herb-Your gonna give those airpowers one more whirl eh? I bet that ought to do it. Im interested to see how they work out once modded.
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Old Dec 11, 2008, 12:51 AM
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Answered my own ?
to see result, see my Edited post #58.
90% FSA achievable!
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Old Dec 11, 2008, 06:45 AM
Julian T
Fleet, UK
Joined Jun 2005
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Quote:
Originally Posted by Herb
Consider adding a smoke pod to protect the bottom - it could be used as a grab device for handlaunching too:

.

Will do Herb - already taken on board
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Old Dec 11, 2008, 08:30 AM
deltas are cool
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Bmiller

yes i was going to do it in 2 pieces .....but i intend to make the duct with a center fairing to eliminate the spinner /hub also i would like to leave the ring if at all possible so that it will be a easier install.
turbonut:PM'd you so i can get your number
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Old Dec 11, 2008, 09:43 AM
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Pm Sent!...its all in stock and ready to ship!...I did run up the stock fan and it is suprizingly smooth...next up is 4s then 5s and see if it pops....
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Old Dec 11, 2008, 11:32 AM
deltas are cool
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some body's got to push the envelope
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Old Dec 11, 2008, 05:49 PM
deltas are cool
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OK i have one on the way pump up your pay pals boys
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Old Dec 12, 2008, 12:55 AM
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Quote:
Originally Posted by AIR SALLY
yes i was going to do it in 2 pieces .....but i intend to make the duct with a center fairing to eliminate the spinner /hub also i would like to leave the ring if at all possible so that it will be a easier install.
turbonut:PM'd you so i can get your number
Nice you got one coming! For sure I want a duct!
Center fairing is better if you can work it out plus it'll pull some air past the batteries but don't hurt yourself, a nice simple V in the middle is darn good too..
With both intakes as a single unit, the assembly may be too wide to be able to install...you'll figure it out when you get yours.
The minifan seats against the ring. Duct won't fit thru to seat against the fan, easier all around to remove the ring then the fan will seat on the ducting as usual. Add in you'll probably need to slide the ducting even further back to get the intakes positioned anyway. The ring is glued to the bulkhead so it shouldn't be hard to remove, leaving a nice round hole ready for your ducting. Ahh you'll figure it out...I talk too much.

Bruce
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Old Dec 12, 2008, 08:59 AM
deltas are cool
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Bruce cant wait to get a look at it so you'll be number one on the list.hey Turbonut did you do any more runups ?
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Old Dec 12, 2008, 09:59 AM
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Not yet! tomorrow morning ...I have a 4s and a 5s ready...see if It breaks..
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Old Dec 12, 2008, 11:13 AM
deltas are cool
AIR SALLY's Avatar
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5s just might smoke the motor (stock motor)but hopfully the fan stay s together.....if i was making a new fan for the market right now i would really look at what has happened in the last 3 yrs and build a 70mm fan that could take 2500 -3000 watts that would cover it for a year or two
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Old Dec 12, 2008, 12:31 PM
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I am sure it will smoke it! so I will just do a very short run...I just want to see if the fan stays in one chunk!
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Old Dec 12, 2008, 12:46 PM
deltas are cool
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stand back eh!
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Old Dec 12, 2008, 12:48 PM
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The e-flite fan and motor look like they are nicely made, but then there's always the proven MiniFan.

The airframe & linkages do not look like they were designed to take more than 600W or so. I like the flexibility though of using all sorts of packs in the nose.
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Old Dec 12, 2008, 01:35 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
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dad, you cant do much of a center body on this one..the stock fan has a bended blade/spinner type thing....maybe its best just to do a smaller fairing.
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Old Dec 12, 2008, 11:44 PM
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I wouldnt do the center body for the intake as withthe stock fan you will affect the cooling of the motor..it realy is a clean set up they have used on the fan and motor..I think you will like it!
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Old Dec 13, 2008, 12:06 AM
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I just ran the stock motor and fan in my Phase 3 F-16 on a set of 2s 2200 tpx v2's in series for 4s. Got 459 watts and 36 amps on the astroflight wattmeter,not to shabby.
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Old Dec 13, 2008, 12:34 PM
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Do you know what the volts were under load? it sounds a bit low for a installed setup..
if you get a chance run it again and lets see if the batts are holding up..
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Old Dec 13, 2008, 12:49 PM
Julian T
Fleet, UK
Joined Jun 2005
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Quote:
Originally Posted by turbonut
Do you know what the volts were under load? it sounds a bit low for a installed setup..
if you get a chance run it again and lets see if the batts are holding up..
12.75? < 3.2v per cell so not great.

The standard motor won't last on 4s though and the esc is only rated for 3s.
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Old Dec 13, 2008, 02:19 PM
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Quote:
Originally Posted by MustangAce17
I just ran the stock motor and fan in my Phase 3 F-16 on a set of 2s 2200 tpx v2's in series for 4s. Got 459 watts and 36 amps on the astroflight wattmeter,not to shabby.
Looks like your LiPos are toast ... they should hold at least 3.45 -3.50 V / cells under load, yours only deliver 3.18 . The stock fan on decent 4S has been measured to deliver ca. 570 W.
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Old Dec 13, 2008, 02:36 PM
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I will post some more pics I took this week.

The WeMoTec MiniFan fist right in without any modifications, it fits in the intake ring as well as on the two wood rails.

I had to lengthen the motor wire cables so as not have to do the connections later through the fuse bottom.

Also, the power cables need to be securely suspended inside to fuse so as to not get sucked into the fan later

.
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Old Dec 13, 2008, 02:39 PM
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I did not use the recommended e-flite servos with their very delicate plastic gears.

I used instead a pair of trusty HS-81 MG servos I had lying around, which fit right in without any modification,

.
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Old Dec 13, 2008, 02:43 PM
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I added some tiny bit of epoxy to hold the elevator rods better in place, you never know ...

It was enough to just tape the elevator anhedral jig together, now the plywood is reusable.

.
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Old Dec 13, 2008, 02:46 PM
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I also needed to move the elevator and steering servo to the side, to make sure my bigger batteries do fit,

.
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Old Dec 13, 2008, 03:01 PM
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Thanks for the pics, I wondered about batt space with the stock servo positions.
Going with HS56hbs in the wings, slightly modded the stock servo mounts for wire clearance but like the fact they leave the servos easily removable.
I had to trim 1/8 off the lower fan tab to clear the bottom of the fuse on mine.
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Old Dec 13, 2008, 03:04 PM
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Yes the fan was a tight fit - maybe that's what that loud crack was about . Sanding the mounting tabs a bit on the WeMo would have made it slide in more easily ...
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Old Dec 13, 2008, 03:11 PM
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LOL! better drip a little glue on the fanmount to fuse joint!
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Old Dec 13, 2008, 08:14 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
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guess what i got today thanks Airland hobbies ...guys quick sevice form Scott at AIR LAND Hobbies ,and Lav. got the fans too thanks Scott and Joe...did i mention Airland Hobbies rocks?
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Old Dec 13, 2008, 08:21 PM
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herb batts are brand new,after more thinkin im gonna charge them back up and check it again.
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Old Dec 13, 2008, 08:34 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
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the best a 2200 batt can do is about 500-600 watts a 25c batt should only have to handle 45...maybe 50 amps in short bursts.it might be so much KV for 4s and that small of a batt.
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Old Dec 13, 2008, 08:43 PM
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my batts are charging now...numbers soon!
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Old Dec 13, 2008, 08:50 PM
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Bruce,

Mine has a bunch of down-thrust as you look at the orientation of the mylar tube from the back, in reference to the wings.

I am making some supports for the thrust tube, to redirect the air a bit upward, otherwise it looks like this thing will aim for the ground as soon as you open the throttle a bit?
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Old Dec 13, 2008, 09:04 PM
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I'll check mine but expect the same thing, looks like a use for those square foam packing pieces in the box eh!
I also extended the slots cut in the tube to snug up to the fan shroud better.
Might end up abit short but better that than loose...
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Old Dec 13, 2008, 09:07 PM
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roger,thanks for the info,
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Old Dec 13, 2008, 09:30 PM
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Herb,
When I hold the mylar tube to the bottom rear edge of the stabs it looks aligned.
I'd say a 1/4" shim on the bottom should hold it there.
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Old Dec 13, 2008, 11:36 PM
deltas are cool
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Tehachapi ,CA.
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i started a mod thread for every one to post there mods,and how to do them.
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Old Dec 14, 2008, 02:42 AM
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Cool Roger!
Fan unit and all servos installed in mine, used 3 HS65hb and one HS65mg for the elevator. All installed in stock locations for now, my battery pack fit.
Soldered on all connectors for the ESC (ready to plug and play)
Fan is angled downward stock but it needs to be, to clear the stabs inside the fuselage.
It will take more serious mods to get a straight shot out the back...(something to try at a later date perhaps)A shim will suffice for now.
Sanded the paint off the wing saddle(root)epoxying now.
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Old Dec 14, 2008, 02:51 AM
deltas are cool
AIR SALLY's Avatar
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i would like to make the wing removable ..any one have an idea how we can do this.?
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Old Dec 14, 2008, 04:00 AM
Julian T
Fleet, UK
Joined Jun 2005
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Quote:
Originally Posted by AIR SALLY
i would like to make the wing removable ..any one have an idea how we can do this.?
The OK MOdels Mig 15 which has identical construction to this Hawk recommends just taping the wings to the fuselage in the instructions. I went with epoxy but I remember someone in one of the threads on that model did just tape his wings and they were ok. Whether they would stand the power levels you might wish to apply

I am using the fan/motor combo from the Mig which is 5 blades and appears almost identical to the recommended fan. I found a 6904 has a slightly smaller outside shroud diameter and was slightly loose in the intake ring. I also found it necessary to remove a fair amount of the mounting lugs but not before I got a healthy cracking sound like Herb

I have tried this combo on 3, 4 and 5s. 4s would appear to be the sweet spot for this combo. Though it sounded great on 5s I am not sure hwo long the motor would hold up at the measured 850 watts.
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Old Dec 14, 2008, 05:11 AM
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Yup several models just use tape to hold the wings but they're designed for it.
You'd need to build up the fuselage area around the spars to spread the load out and fill the rods with resin or even steel rod. I think they're abit small to carry the entire load as is.

update on my build progress.
wings and stabs on, fixedgear installed, she can fly tomorrow!
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Old Dec 14, 2008, 12:17 PM
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Quote:
Originally Posted by juliant
... I went with epoxy but I remember someone in one of the threads on that model did just tape his wings and they were ok...
There are two carbon spars to hold the wing in place On mine I glued the spars in the fuselage, but made the wing removable by holding it in with tape.

I am sure it will work fine, has worked on my Aeronaut Panther for several years.

The wings sit very solidly in the mounts, and if not there's always the epoxy solution later ...
.
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