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Old Sep 18, 2006, 03:45 PM
diligentia vis celeritas
gunracer's Avatar
Corona, CA
Joined Feb 2006
3,547 Posts
i'm also amazed at some of the lower auw i've read on this thread...using the below components, my p40 comes in at 6.5 oz...

dx6 rx
2s 700 batt
eflite esc
stock motor
2 cox servos (elevator and ailerons)

to minimize wing flex, i reinforced the le with a pushrod bent to match the dihedral...relatively heavy, she still flys better than i ever expected her to...
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Old Sep 18, 2006, 05:19 PM
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peterp1964's Avatar
Joined Oct 2005
659 Posts
Quote:
Originally Posted by gunracer
i'm also amazed at some of the lower auw i've read on this thread...using the below components, my p40 comes in at 6.5 oz...

dx6 rx
2s 700 batt
eflite esc
stock motor
2 cox servos (elevator and ailerons)

to minimize wing flex, i reinforced the le with a pushrod bent to match the dihedral...relatively heavy, she still flys better than i ever expected her to...
well, your components are too heavy !

I used a bluebird 4ch receiver and servos, a BP10 esc (not light!), a
polyquest 3S 300mAh, a piece of ply, a firewall mount, a 20mm cdrom,
Deans 3pin plugs for the motor/esc, 2 washers and 2 nuts for the prop, the
charge plate, z-bends inside, the cox shrinktube methodon the outside.
Foam-safe CA on everything except the motor mount where I used epoxy.

AUW 151 gr, including the decals

Peter
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Old Sep 19, 2006, 09:41 AM
ooops
StCalvin's Avatar
Dekalb,Illinois
Joined Oct 2003
1,452 Posts
Due to dumb thumbs I finally had to retire my Spit and P-51. Was not a good day.
Going to build 2 more. This time will see how they work with lypos. I am concerned about balancing. With the Cox nihm's it was a real no brainer. How about with lypo's? Any issues?
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Old Sep 19, 2006, 03:52 PM
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MLem's Avatar
USA, CA, San Francisco
Joined Jun 2003
246 Posts
you're gonna like the lipo. on my corsair it slips right in and gives me long flight times. sounds like a viagra ad. heheh.
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Old Sep 19, 2006, 03:53 PM
KK6MQJ
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Joined Sep 2004
13,600 Posts
Hey Mlem, I just finished my Corsair too! 2S lipo with stock motor. You fly in south bay or? I am North Bay.
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Old Sep 19, 2006, 06:36 PM
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MLem's Avatar
USA, CA, San Francisco
Joined Jun 2003
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barnes,
i'm over the golden gate in sf. just flew at crissy field last weekend. in sf gotta fly 1 step ahead of park rangers...

i'm working on the mig 21 for beanie right now.

we should see if we want to schedule a fly-in or furball one of these days.

mike
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Old Sep 23, 2006, 11:05 PM
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Chattanooga, Tennessee, United States
Joined May 2003
27,197 Posts
Well, I've just got my LensRC 17T Spitfire pretty much together - 136g with 2s 480, 147g with 3s 480. Even then it feels too heavy for the very limited wing area. When my second kit comes I'm going to try a Medusa 4000 - maybe I can lose another 10g-20g.
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Old Sep 24, 2006, 09:48 AM
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Chattanooga, Tennessee, United States
Joined May 2003
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Here is the internal layout. I need to determine where to cut the starboard fuselage. I want to be able to remove the forward section of it to gain access to the ESC and battery - I guess I'll use some little rare earth magnets to hold it. This portion of the aircraft, with the tail feathers, and including the motor/prop and 2s 480, is 113g - add 23g for the wing, for an AUW of 136g.

Question: I faithfully followed the alignment for the stock motor (down and right thrust), but this amount of downthrust looked a bit excessive - doesn't it???

I don't trust servo tape, so my servos are tightly fitted between little balsa strips, so they cannot move for or aft when in use.

The Rx, ESc and antenna are all held with Velcro.

Cheers, Phil
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Old Sep 24, 2006, 09:59 AM
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United States, CO, Colorado Springs
Joined Jul 2004
531 Posts
thats what i was thinking when i built mine looks like alot of right and down thrust. when i hand launched the sucker it went perfectly strait and level with a gentle climb it was perfect
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Old Sep 24, 2006, 11:07 AM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
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Thanks for the vote of confidence! It's just that it doesn't look right!
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Old Sep 24, 2006, 11:16 AM
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SW Vermont
Joined May 2002
556 Posts
Kiwi--I think it's because the weight is so low and the overall surface areas are so small that the "extreme" right and down thrust is needed. But they do fly with zero trim if you use the built-in thrust angle.

Red61--drop me a PM.
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Old Sep 24, 2006, 02:14 PM
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United States, CO, Colorado Springs
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yep mine also needed no trim flew very srait from the start
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Old Sep 24, 2006, 09:16 PM
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Joined Oct 2005
659 Posts
Quote:
Originally Posted by Dr Kiwi
Question: I faithfully followed the alignment for the stock motor (down and right thrust), but this amount of downthrust looked a bit excessive - doesn't it???
what's with the giant prop ? trying for a heli mod I have a 4.5" on my P47
and _it_ looks big !

Peter
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Old Sep 25, 2006, 06:43 AM
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Chattanooga, Tennessee, United States
Joined May 2003
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Quote:
Originally Posted by peterp1964
what's with the giant prop ? trying for a heli mod I have a 4.5" on my P47
and _it_ looks big !

Peter

The only small CD ROM motor I have is this 17T - it doesn't draw more than ~3-4A with a 4"-5" prop even on 3s. - that's why I'm trying a 6x3. I do have some odd small Cox 3-blade props - to hell with the efficiency - they might be okay even on 2s. A Zagi might be okay, or 5.1x4.5 Broad-bladed APC, or an odd Graupner I have - all of those suck amps.

I really need a hotter, lighter CD ROM motor suited to 4-5" on 2s!

The opposite is true of the Medusa 4000 I want to try in a second Spitfire - it can't spin more than a 3" prop DD on 2s - and 3" looks awful small!
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Last edited by Dr Kiwi; Sep 30, 2006 at 11:38 AM.
Old Sep 25, 2006, 07:44 AM
Outcast outlaw
As far away from RCGroups and the AMA as possible!
Joined Aug 2004
6,601 Posts
Quote:
Originally Posted by Dr Kiwi
I really need a hotter, lighter CD ROM motor suited to 4-5" on 2s!
I don't know if the BP-21 is smaller or lighter, but it's suited to 4-5" on 2s.
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