Guillows P-40, 27 inch

[frankben]

Hi

After my first build (Hurricane 16 inch) where I did al lot of learning I would like to build a p-40, 27 inch for RC.
Now, a lot of guys here are telling me that this plane will not fly becouse it is designed for static. On the plans however there are instructions for RC and there is a building treat on internet where one of U guys build it to fly, so why should I not give it a try? or am I seeing it wrong?





http://www.rcgroups.com/forums/showthread.php?t=1028262

[Phugoid]

These planes were designed to fly and will fly, even on rubber if kept light enough.

The kit in your picture is the 500 16 inch span model, not the 400 series 27 inch span model?

[frankben]

sorry, wrong picture. My box is 27 inch

[simonlschmitz]

frankben,

This plane will fly as an rc conversion.

http://www.virtualaerodrome.com/image_d ... &offset=12

Here is someone's video to prove it:

http://www.youtube.com/watch?v=Ax3sGfBZhTM

Have fun,

Simon

[frankben]

Hi,

On the Guillows plans they instruct to give 1" Dihedral in addition to the standard 1" 3/4 for RC flying, that's 2"3/4 and give me 12 degrees! witch is pretty much!

A guy "Bengston" posted this on a forum: Here is a few things I have learned from doing Guillows conversions.

1) Often the wing incidences are too large for electric R/C. I had a SE5a with incidences of 7 degrees. Lowering it to 2 made a dramatic improvement.

see: http://www.rcgroups.com/forums/showthread.php?t=91148

What should I do?????

[supercruiser]

First, we should clarify words. You mention dihedral, "bengston" said incidence. That is two different aspects of aircraft rigging. I think what is being said is that the wing tip height above horizontal (dihedral) is too much.
The dihedral helps with free flight stability. With an r/c model you have direct control of the model flight path, I am guessing that you could go with about half the height called for on the plans. I've never done an r/c conversion but I think 2 3/4 is excessive.

[frankben]

Sorry, you are right, I mixed up the meaning of the two words, English is not my natural language. I think I will keep the dihedral of 1"3/4 as is original on the blueprint. The incidence (angle of attack) 2 degrees. I also will add a little washout on the TE near the wing-tips.

Thank you for your advice

Frank

[simonlschmitz]

For the 400 series, I use a dihedral of 1"1/4 and an incidence(angle of attack) of about 0-1 degrees.

[frankben]

For the 400 series, I use a dihedral of 1"1/4 and an incidence(angle of attack) of about 0-1 degrees.

Thanks for the data, I measured de incidence on the plan and I also came up with 1 degree, I will built my wing with 1"1/4 dihedral.
Cross my fingers and hope it will fly rc , otherwise it will be a plane to hang on the sealing! , if there is any left!

Frank

[Seeker]

Is that one and a quarter inch for each wing, or is that how high you suspend just the one wing tip when gluing?

(just about to start a 403 Spit)

[frankben]

the middle section under the fuselage is flat, then each wing-tip is 1"1/4 high.

Make a new topic with pictures of your spit, I would like to follow your work!

I started today, pictures will follow later

[frankben]

Hi,
I would like to use this setup for my p40 conversion, what do you guy's think. Just dont now to use a 2 cell or 3 cell (3 cell give more power but also weight!)

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9303

http://www.slickzero.com/page/SRHP/PROD/Mot/2208-14-A-BP

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10192

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9827

[simonlschmitz]

If you use a 2 cell, then get a motor rated 2200-2600kV and a 7x5 prop. I tried my p-40 with the 2208 1450kV motor with 2 cell and a 7/5 prop and didn't get enough thrust to keep it in the air. I switched to the 3 cell and it did fine. My p-40 did weigh 16 oz so that might have had something to do with it. If you get it between 12-13 oz you should be okay.

[frankben]

the engine 2208-14 should give me with a GWS 9 x 5 propellor and a 2 cell battery about 485 g / 17.1 oz (74 Watt) of trust.
My plane should weight around 13 a 14 oz max. They recommend it for trainers up to 17 oz.

See http://www.slickzero.com/page/SRHP/PROD/Mot/2208-14-A-BP

[scigs30]

I cannot wait until the Large Stuka is laser cut, because I will electrifly that build. There is a lot of work into converting these to electric RC so I think the Stuka will be the only one I do. I just bought a P40 Electric kit about the same size as the Guillows P40 at 31 inches and cannot wait to start on it.