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Archive for May, 2010
Posted by Knoll53 | May 13, 2010 @ 06:14 PM | 7,663 Views
After a few days of flight testing, the tip stall is tamed by proper CG placement. The short tail is adequate and needed to carve turns. Pitch is sensitve, but generally stable. At high speed there is a quick pitch oscilation. It's like a flutter, but I think that this wing is too stiff to flutter. More testing to follow.
The nose pitches up noticeably in lift. It's a good thing.
Posted by Knoll53 | May 08, 2010 @ 11:25 AM | 7,401 Views
This prototype project is primarily for testing flight characteristics of the real project, which is an all wood Horten 10-c. It is a bagged foam wing with a MH60 out to half span, then transitioning to SD8020 with about 6 degrees of twist. The tip rudders are removable. I consider them "training wheels". I've yet to build a swept flying wing that does not have a "interesting" tip stall. this one is no exception. The tip stall, although manageable, is a problem. So far I have tested various CG locations and have found a happy compromise. Too far back, it tip stalls severely. Too far forward, it is stable but performance is poor. It is as if you have full spoilers deployed. Having a in flight adjustable CG, coupled to "up elevator" would indeed act as an effective glide path control.

Next up, fine tuning CG and flight testing as pure flying wing without tape on tip rudders.