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Old 09-22-2019, 11:13 AM
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Rktman Rktman is offline
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Default Cause of launch spiral?

Hoping the glider pros here can diagnose why my scratch-built slide pod did a 360° spiral on the way up? It wasn't a tight spiral, but more like a quick loop before settling into a normal glide at ejection.
Confirmed that nothing is misaligned (although I purposely made one wing 1/8" lower to get the glider to circle) and there was no rod-whip, it only did the loop about midway up.
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Old 09-22-2019, 01:23 PM
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If it does not do it regularly on subsequent flights, I would bet on a wind gust at that altitude.
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Old 09-22-2019, 02:01 PM
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Any chance it's because there's not enough dihedral?
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Old 09-22-2019, 03:59 PM
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Possibly. Dihedral tends to dampen the roll axis.
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Old 09-22-2019, 04:29 PM
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Quote:
Originally Posted by ghrocketman
Possibly. Dihedral tends to dampen the roll axis.


Oh, didn't know that. I thought it only functioned that way in horizontal flight, didn't realize it affected vertical trajectory as well.
Easily fixed though, it's already a polyhedral wing with enough space to put in another canted panel if need be.
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