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Author Topic: Flat Wing P-30  (Read 2970 times)
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OZPAF
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« Reply #75 on: April 03, 2021, 01:26:14 AM »

Definitely agree! What a beautiful setting and I would think you have achieved your goal!

John
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calgoddard
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« Reply #76 on: May 02, 2021, 08:54:59 PM »

Thank you John and Urs for your kind words.

There was a calm morning at Washoe Lake, Nevada, On April 19, 2021.  So I went flying.

I flew my third Three Nite P-30 (red and yellow) for the first time.  This is the second one I built from the Volare Products short kit.  As you know, my first build of the Volare Products short kit (blue and yellow) flew OOS and was lost.

After a few trim flights, I wound the 12 x 1/16-inch motor to 1200 turns and 7 inch-ounces of torque.  The model rolled a bit to the left shortly after being launched due to the high torque, but recovered.  It DTed at 3 minutes and twelve seconds about 75 feet above the ground.  It could have been a flight close to four minutes but for the DT.  It may have caught some good air way up high.  On the other hand, the torque roll at the beginning of the launch surely cost the model some significant altitude.

See the attached pics.

This time the model was carrying one of my Walston RF transmitters - so the AUW was probably around 45 grams (not counting the rubber).  Naturally, the RF transmitter was not needed as the chases were short and the model easily retrieved by sight. This was the fifth wind of the rubber motor but the prior winds were something like 100, 300, 500 and 850.  I had taken out a slight amount of right thrust (maybe 1/2 degree) prior to the last flight because the model had been turning a bit tight to the right in the power phase.  I can either put that right thrust back in, or fly with a 10 x 1/16-inch rubber motor which can't take much more than 6 inch-ounces of torque but gives you a longer motor run.

Again, no lateral instability issues with this design were detected. So, the tip plates apparently eliminate any need for conventional dihedral and wing tip wash out.

Thanks for all of you that have read my posts on the development of this model and given me your support. I have around ten P-30 models, some of which are very high-tech.  The rudimentary design of my Three Nite P-30 has proven to be a good performer in my flights of three of them that I have built.  For some reason the glide of this design seems particularly good for a P-30. I am guessing that the good glide performance has something to do with the tip plates reducing wing tip vortices that induce drag.

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Re: Flat Wing P-30
Re: Flat Wing P-30
« Last Edit: May 02, 2021, 09:07:37 PM by calgoddard » Logged
Olbill
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« Reply #77 on: May 03, 2021, 12:38:37 AM »


 For some reason the glide of this design seems particularly good for a P-30. I am guessing that the good glide performance has something to do with the tip plates reducing wing tip vortices that induce drag.


I think there are a number of indoor duration classes that have benefited from this layout: LPP, F1M, Ministick, Wright Stuff. I'd like to build a competitive A6 like this. I actually started out in A6 with a flat wing/tip plates model, but the prop I was using then was inferior to current ones.
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OZPAF
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« Reply #78 on: May 03, 2021, 09:13:50 PM »

That's a rewarding result Cal. Perhaps a slight increase in the height of the wing tip plates would help to reduce the torque roll on launch with the more powerful rubber - effectively increasing the dihedral effect.

Anyway you certainly have developed an interesting model.

John
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