Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Patriot xl

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Old 01-10-2010, 09:34 PM
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rabbid fly
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Default Patriot xl

Would any of you guys know if the XL was built with a washout in the wing?? If so how much or should i even bother?
Any answer would be welcome. Thanks.Phil
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Old 01-10-2010, 10:18 PM
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combatpigg
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Default RE: Patriot xl

wash out is only needed to keep over weight planes from falling out of the sky, not good for any kind of a speed plane.
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Old 01-11-2010, 03:42 PM
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Default RE: Patriot xl

Thanks for the reply, i didn't think it was built with a washout, time to cut a wing!! Thanks.Phil
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Old 01-11-2010, 04:23 PM
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Default RE: Patriot xl

In order to be more accurate - a mechanical washout is a twist in the wing's tip in order to prevent tip stall.
in tapered wing, the stalling pattern starts from the tip and moves on tho the center of the wing, the washout (wing tip at lower AOA) spread the stalling pattern through the entire wing length.

as for the patriot xl, due to highly swept wing, there tip stall in almost unnoticeable and the plane acts very well at high AOA (mainly in landing).
implanting a washout will cause higher drag (something you want to reduce as much as possible - for high speed planes).

if you want to enhance the wing's performance, lowering the drag and preventing tip stalling due to wingtip vortex, you should build a winglets to reduce wingtip vortex.
you will gain a reduction in drag and a wing that perform much more predictable (mainly stalling characteristics).

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Old 01-11-2010, 04:37 PM
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Default RE: Patriot xl

that's excellent advice Ravivos, and i am thinking of doing this on the one i'm building.
there is a tapered jig piece for the Patriot wing in the kit..............the taper goes from fat to thin at the tip when doing work on the wing when it is upside down, so there is washout built in to the Patriot wing. this of cousre is for the 40 size. i don't see this on the XL.
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