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Wing section help


Monz
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Busy planning the next build, a quarter scale BF109 E4, and a bit stuck on which section to use.

I'd like something semi symmetrical to keep the lines between the fus and the wing. The Matt drawing says its similar to the NACA 2315, but that looks a bit thick for the slope.

Would the E374 thickened up a bit be ok? Any other ideas?

Thanks.

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Posted by Monz on 09/08/2019 21:05:11:

Busy planning the next build, a quarter scale BF109 E4, and a bit stuck on which section to use.

...

At 1/4 scale (!!), that's about an 8.14 ft wingspan and an average chord about 1.32 ft; that's pretty big. However, I'd be inclined to stick with a bona fide slope soaring wing section because the problem with very large models that have thick wing sections is that they're often relatively light, so often end up being a little bit slow.

If it was me I'd go for the thickest available proven PSS section (not a lot wrong with E374, but I seem to remember reading that RG15 is designed to work even when thickened up quite a lot, possibly as much as 15% but I could be mistaken), mounted at a reasonable angle on the fuselage with possibly a bit of artistic sleight of hand at the wing root. And washout, of course...

HTH

A.

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I'm no expert so I can't offer you any advice, but Andy Meade's Hawker Typhoon is 1/5 scale I think and built from a powered kit. After seeing it fly at the Lleyn PSSA event in June I'd question whether you need a specific "slope" section. The Typhoon has a thick semi-symmetrical section so yes will be draggy but the model carried enough momentum to fly like a tankbuster.

I'd probably say don't build the Me too light!

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Interesting observation. The designer of my current (rather long term) build has stated that his original Tempest, built to comply with the then current 5kg limit for scale comps was nowhere near as good a flyer as a much heavier second version that he built at 7kg - and that was not as good as a customer's model with a Quadra Petrol at 10kg that he test flew!

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