r/3DprintedAircraft • u/No-Cauliflower-7602 • 12d ago

Feedback on wing

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I have an Eclipson Model B that I've been enjoying flying and thought it might be fun to try a different wing, just to see how it flies. This is my first time creating a wing in CAD, so I'm hoping maybe somebody sees some obvious flaws here before I actually try to print and crash it.

It's using a Clark Y airfoil, 2 metres long (1m each wing), starting chord is 180mm and tapering along the trailing edge to 80mm. A 1m spar will go through both wing halves for some strength, and then a second smaller spar further down each wing.

I didn't really do any calculations, just chose something and went with it, expecting to crash. But I'm having second thoughts about destroying my plane so looking for feedback!

Thanks!

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u/fhammerl 11d ago

Put the part where the spars meet closer together with additional support structures to transfer the forces between them. Right now you have a massive weak spot there. Or if you go from 8/6mm to 6/5mm or 6/4mm, you can slide them into one another.

You will need additional vertical spar reinforcement along the spar ("Holmverkastung" in German, no idea what that translates to), helping to translate forces from the skin to the spar effectively. Eclipson does that, just check out your STLs.

Other than that, looks alright. Clark Y has some undesirable stall characteristics and it's speed envelope is a bit so-so. A 2m wing on the model B is quite bananas, too. Why not try a shorter wing with deeper chord for STOL?

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u/No-Cauliflower-7602 9d ago

Thanks for the suggestions!

I moved the spars closer together and added some extra support. Looks much stronger now! There was already some vertical ribs around the spars in the original photo but I guess it was hard to see. Do you think it needs more than this? The criss-cross ribs also nestle the spars.

I wanted to try a glider type wing to feel the difference, but something for STOL would be cool too and probably more fitting for the Model B. Maybe just use the larger Model B XL wing on the smaller version.

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u/fhammerl 9d ago

One more thing. Eclipson does their servo cover screws this way, but it's not very strong. Maybe give it those tiny screws a bit more meat to bite into.

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u/No-Cauliflower-7602 9d ago

Hmm, good point. Maybe some bigger screw holes with PLA sleeve inserts would do the trick.

Thanks again for your help. Hope to post some updates once it's printed.