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Old Sep 03, 2012, 10:56 PM
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Originally Posted by scunna View Post
Good job, yeah for some reason those Hobbyking T45s sound fantastic. I had one last year with a generic 5-blade unit that sounded much better than it was supposed to. Only problem is the plane is just too tame and easy to fly
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Old Sep 04, 2012, 01:45 AM
scunna
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United Kingdom, England, South Shields
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pulls 60 on 5s 80 on 6s
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Old Sep 04, 2012, 03:46 PM
Diverted by planks
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South Florida
Joined Dec 2010
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Originally Posted by nighthawk0077 View Post
Good job, yeah for some reason those Hobbyking T45s sound fantastic. I had one last year with a generic 5-blade unit that sounded much better than it was supposed to. Only problem is the plane is just too tame and easy to fly
Yup, HK T-45 = perfect EDF trainer. Very docile. So, I know it's not too much of a challenge once you get going, but something about it's shape and color scheme that makes me still love seeing it in the air.
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Old Sep 04, 2012, 04:14 PM
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Cape Coral, FL
Joined Nov 2001
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Originally Posted by scunna View Post
I also have the HK BAE Hawk 70mm sitting in a box for about 2 months now. Is that the same one you have?

Time to dust mine off and build it , with a CS10 fan of course. Do you have any photos of the "carving" of the fuselage to fit the fan?

Regarding all up weight, the "standard" configuration (which we know is lame) uses 1600 3S LiPo. So a 3000 6S is probably max'ed out on weight. It looks by your casual hand launch that it handles the weight just fine.

Exactly which 6S 3000 packs are you running and what C rating?

At 80 amps continuous, I presume you want a pack that can deliver 100 amps. So a 35C rating should be enough.

I have the HK L2850 2100 kv motor still in the box, so I don't know if it draws 80 amps like the BL32.

Derek
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Old Sep 04, 2012, 05:02 PM
It should fly at least once
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Australia, NSW, Grenfell
Joined Mar 2006
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Just remember that this is a draggy airframe and excess power is wasted on it, sure it needs more than standard but don't go overboard.
Its like a Ferrari you don't need to drive it fast , it looks the goods.
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Old Sep 04, 2012, 05:09 PM
Progress with the process...
M3ATpl0w's Avatar
NE Alabama
Joined Feb 2011
136 Posts
Is the Hawk in the video the 64mm or the 70mm version?
If it were the 70mm flavor, why would he need to gut it for the fan?
It Does sound fantastic.
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Old Sep 04, 2012, 07:25 PM
Another one on the way...
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Plano, Texas
Joined Feb 2009
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Quote:
Originally Posted by Knife Liddle View Post
That`s right, STUPID fast, stupid powerful, probably just plain stupid too, but we`ll see how it holds up.

It`s powered by a Turnigy 3126 that has been rewound to 2.5 turns for aprox 2900kv (need to measure it). I added a 4" long shaft and an extra front bearing to support the longer shaft. The motor has an OD of about 37mm so it`s in the standoff position. I`m using a collet style adapter, but I`ll have to check to see which one it is. No mods to the shroud except what was needed to fit the standoff block. The rotor is bare bones stock.

Note: This is competely insane to run this $15 fan like this. Don`t do it, don`t even think about doing it. (That way I can be the only guy who has one).

Just the Facts.............

6s, 22v ( ran a 6s2p10ah battery to hold voltage)
145a......sustained
3.2 kw....""
97oz thrust.....6lbs 1oz
261 mph efflux speed (measured with Eagletree V3)

Esc used is a Suppo 7s 200a (the type with adjustable timming (30 degrees) and pwm 16k)

I`ll post some pics later. I may have found the powerplant for my Squal.

Cost about $80 for motor/wire/fan/esc. Then add lipos.
Lee,

What is your impression of that Suppo 200A ESC?

Yoram.
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Old Sep 04, 2012, 07:46 PM
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Australia, VIC, Melbourne
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Derek, it looks like it is the 'other' T-45 that HobbyKing also have. But that doesn't matter.... your one would work totally fine anyway!
The T-45 is just a fantastic model aircraft subject and all forms of it fly fantastically.

And a Tracknoob mentioned, there is just something about its shape (lines) and colours, that make it highly attractive - more so in the air!! Like a Ferrari !!

The L2855-2100 is certainly no BL32!!! lol
It will run very well on 5S - in any aircraft of this size range - but it will dislike 6S!! And pretty certainly will fry in a short time frame. But for its cost, and result, it is perfect for 5S.... though the 2300kv version is even better.

If you do want to run 6S, go for the CyclonePower (I think they have something 2100kv area), or otherwise a HET (2w30) 2200kv.
On 5S.... L2855-2300, or 2100kv for just 'good' power..... or for big power, CyclonePower 2550kv - and not sure which exact HET.

Seeing you have the L2855-2100v..... just do that on 5S and I am sure it will be a great flyer!
And if you feel you need, or want, more power/speed..... plan for the HET2W30 6s path one day - a very easy thing to change to then.

I have too many aircraft already now... but this 70mm T-45 has been a high desire target for ages now! Just luckily HK Aust doesn't have stock, and haven't in a long long time!!
I would almost intentionally smash/destroy (from flight!!) one other aircraft to have room for this!! (Either an F-15 or F-18 in 70mm's that I have). LOL
Hmmm, a "Dogfight to the death" would be a good way to do that...... good idea!
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Last edited by PeterVRC; Sep 04, 2012 at 07:51 PM.
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Old Sep 04, 2012, 10:52 PM
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Cape Coral, FL
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I kinda have a unique situation, so I should back-track a little and explain my goals for this BAE Hawk and maybe this will help home in on a motor / battery combo. I'm open to buy anything, but I happen to actually have all 3 kv ratings of the BL2855 - the 2100, 2300 and 2800. But I don't experiment much with them. I definitely only want to use the stock CS10 plastic shroud.

My goals: I have a very small tight field I want to fly this Hawk (where I fly my little 3D foamies) so I want it to fly light and slow, but still do a loop. So I need:
1) Slower speed with good thrust is key. Hand launch, no landing gear.
2) Lightest weight possible and good thrust at lower speeds.
3) Short flight time is OK, say 2.5 to 3 minutes.

Kinda just the opposite of what most people are trying to do. I am open to any cell count / combo with any of the L2855's. Or any other motor. Actually the L2855's are probably kinda heavy with the big heat sink cone.

This Hawk is one of the lighter airframes I have seen for it's size:
Fuselage 221 grams
Wing 110 grams
Stab + Rudder 20 grams
Nose cone 5 grams
Misc hardware 11 grams
TOTAL AIRFRAME 367 grams (12.93 ounces)

Then add servos, Rx, ESC, fan, motor, battery. I think sub 2 lbs is possible.

Derek
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Old Sep 04, 2012, 11:00 PM
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USA, CA, Aromas
Joined Sep 2010
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4s on the 2800kv is your only choice based on your goal set
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Old Sep 04, 2012, 11:01 PM
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Australia, VIC, Melbourne
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1) The L2855 tail cone is a very thin and light item.
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Old Sep 04, 2012, 11:05 PM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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Quote:
Originally Posted by ysolomon View Post
Lee,

What is your impression of that Suppo 200A ESC?

Yoram.
Great for the money. The type that has adjustable timing and pwm is worth the extra money. They cost in the $40 range.
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Old Sep 04, 2012, 11:10 PM
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Cape Coral, FL
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HK BAE Hawk - is it really a 70mm duct?

I don't know the history of this particular model, but maybe it started as a 64mm fan and then they "converted" the mold to fit a 70mm by simply enlarging the recess for the fan, but left the duct the same size. The inside diameter of foam is only 65mm, but the recess is fits a 70mm fan. What a joke, or should I say Choke!

No wonder scunna (or is it his buddy's plane ??) had to hollow out the interior.

Looks like I will be doing the same. Time to get out the big sharp knife .
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Old Sep 04, 2012, 11:12 PM
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Derek,

had the HK BAE Hawk 70mm airframe. Because of battery placement issues, I think that you will not be able to go 5 or 6S. So, stick to either the 2300kv or 2800kv L2855. The 2300kv will fly it fine on 4S but I don't know how easy the hand launches will be. If you have smallish(<350gr) 5S packs you should be OK though. Otherwise, the 2800kv on 4S is the safe.
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Last edited by anlucas; Sep 04, 2012 at 11:22 PM.
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Old Sep 04, 2012, 11:27 PM
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Cape Coral, FL
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Quote:
Originally Posted by jcdfrd View Post
4s on the 2800kv is your only choice based on your goal set
Quote:
Originally Posted by PeterVRC View Post
1) The L2855 tail cone is a very thin and light item.
Quote:
Originally Posted by anlucas View Post
Derek,

had the HK BAE Hawk 70mm airframe. Because of battery placement issues, I think that you will not be able to go 5 or 6S. So, stick to either the 2300kv or 2800kv L2855. The 2300kv will fly it fine on 4S but I don't know how easy the hand launches will be. If you have smallish(<350gr) 5S packs you should be OK though.
Hey guys, sorry I have not been on the ducted fan threads much lately - I got distracted with a multi-rotor project . It's like learning a foreign language.

For the Hawk, I'll go with the 2800 kv on 4S. My Gens Ace 4S 2500 weighs 297 grams.

I like that answer - I don't have to buy anything .

Derek
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