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Old Aug 26, 2005, 04:55 PM
Neil Jarvis
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Surrey U.K.
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P-40 Warhawk Motor?

I have just bought a CMP p-40 ARF from Falir in the U.K. The finish on the model is superb and I am keen to find a powerful setup with LIPO's for it. The AUW will be in the region of 8lb.
http://shop.store.yahoo.com/raidente...60arfp40a.html

Any help would be appreciated.

Neil
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Old Aug 26, 2005, 08:18 PM
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East Anglia, UK
Joined Sep 2002
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Big astro cobalt 40 or a big AXI outrunner - 41 or 53 series maybe.

See their respective web pages for what voltage/current/props to run it on.
http://www.modelmotors.cz/index.php?...%20-%20409%20g)
http://www.astroflight.com/e/env/000...roducts:af-640


Aim for about 7-800W or more if you can afford it.

At 30A that tends towards 8s LIPO
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Old Aug 26, 2005, 08:33 PM
TRP
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United States, CA, Morgan Hill
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I was going to say Big Axi or HackerB50 9 - 11 XL

800 - 900Watts is what you are going to need.

How do I know? I had the same question a while back while getting started on this gem: http://www.rcgroups.com/forums/showp...3&postcount=16

Ted
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Old Aug 27, 2005, 04:46 PM
Neil Jarvis
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Is 100 watts per pound going to enable large loops?
The watts surely change with prop size, so what size prop will give an adequate thrust?
Neil
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Old Aug 29, 2005, 06:44 AM
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Madrid, Spain
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I have almost finished the P-40 50"
AXI 4130/16
CC PH 60
APCE 14x10
4 packs Polyquest 2600 10C 6S2P 5200mAh
Hitec HS-85BB for ailerons and elevator
Hitec HS-225BB for rudder
Hitec HS-75BB for retract
AUW 6.8 lb
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Old Aug 29, 2005, 04:41 PM
Neil Jarvis
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Did the cells need to go all that way back for the CG?
I was hoping to slot them in from under the cowl, where it removes.
Neil
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Old Aug 29, 2005, 05:22 PM
Rehab is for quitters
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What I'd like to know is the cost of the brushless motor, ESC and the lipoly's.


Dave...
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Old Aug 29, 2005, 07:05 PM
TRP
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Lookin' good.

Hit those decals/stickers with some 000 Steelwool to dull 'em down a bit if you want to give 'em that weathered look.

Ted
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Old Aug 30, 2005, 01:19 AM
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Quote:
Originally Posted by Neil Guildford
Did the cells need to go all that way back for the CG?
Yes
Quote:
Originally Posted by Neil Guildford
I was hoping to slot them in from under the cowl, where it removes.
Neil
It was my hope too. Maybe if you can put the rudder and elevator servo in the tail and with lighter batteries you can get it.
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Old Aug 30, 2005, 03:22 AM
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Quote:
Originally Posted by TRP
Lookin' good.

Hit those decals/stickers with some 000 Steelwool to dull 'em down a bit if you want to give 'em that weathered look.

Ted
Thanks, I didn't know that trick
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Old Aug 30, 2005, 04:59 AM
Neil Jarvis
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I've ordered the motor (same as you).
I must admit, you've done well on the AUW. I expected it to be as much as 8lb.
I'm going to try 3 packs of 2s 3200 Kokams ie 6S 1P.

Its going to be tricky getting the servos any further back than you have, but maybe the RX battery can be hot glued down the tail (done it before and its still there).
Any chance you can video your maiden?
Neil
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Old Aug 30, 2005, 06:47 AM
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Neil,
I don't know if we are talking about the same P-40, I have the smaller one.
http://www.cmpairplane.com/p40-50.htm
http://www.cmpairplane.com/p40-140.htm

You are saving 100gr, 3.52oz in your packs if I compare with mine. So if we talk about the same plane yours can be lighter.

I use an old pack 2S 1200mAh Kokam for RX battery, what I'm not sure is if can be safe to put a long cable from the controller to the battery or from the motor to the controller. Also is more weight.

I don't have a video camera but I will tell how it goes the maiden.
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Old Aug 30, 2005, 06:55 AM
Neil Jarvis
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I've the 50, same as yours.
I was thinking about a 1000 Nicad for the RX.

When do you think the maiden will be?
Neil
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Old Aug 30, 2005, 07:09 AM
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You can save weight if you use an UBEC or cheaper if you use Lipo for RX battery. I think that in this plane it is an investment.

I'm not sure when it will be the maiden, maybe next weekend if I can.

Gonzalo.
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Last edited by Gonsos; Aug 30, 2005 at 07:14 AM.
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Old Aug 30, 2005, 08:31 AM
Neil Jarvis
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Excellent, well good luck. I may have mine ready for the following weekend.
Neil

Can you show me a picture of how you did the canopy and battery access?
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