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Old Feb 14, 2013, 03:40 PM
Zachb657 is offline
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Question

Wingtip staling


How do you prevent wingtip staling on the Spirit 2 meter sailplane? I heard that you can put 1/32 balsa sheeting on the wingtips but i don't know if that will work.
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Old Feb 14, 2013, 03:48 PM
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Spy's sappin' my thermal!
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The easiest solution: don't fly slow and turn!

In all seriousness, yes, sheeting the wingtips is a solution. You can find more details on that, and lots of other improvements to the Spirit, here: http://www.charlesriverrc.org/articl...spiritmods.htm
Old Feb 14, 2013, 07:39 PM
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It's gonna be YUGE!!!
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Have you checked your washout?
Old Feb 14, 2013, 07:57 PM
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this space for rent
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The Charles River site has some great setup tips for the Spirit.

I maidened one for a guy and I thought it flew great. It flew noticeably faster than a Gentle Lady, and retained energy pretty well. I was able to core a thermal up well above the launch height from a high start.

My advice? Fly it faster, and try to be aware of how tight it will circle, and where the point of diminishing returns is.

Fun plane- I wouldn't mind picking a kit version of one.
Old Feb 16, 2013, 01:05 AM
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if its a built up wing , twist the tip at the rear up and shrink the covering , also can sand a blunter radius on the leading edge at the tip ...
Old Feb 16, 2013, 12:57 PM
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Last edited by superskeg; Oct 11, 2013 at 07:10 PM.
Old Feb 17, 2013, 06:51 PM
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How do you know just the tip stalled? If flying slowly while turning its very likely the entire inside wing stalled, especially if adequate washout.

Dive test will do nothing to prevent this, and is unrelated to the angle of attack. Flying a little faster will probably go a long way to solving your problem.
Old Feb 19, 2013, 03:05 PM
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The Spirit is well known for havign tip stall issues caused by a combination of covering sag forward of the spar in the tips, too much incidence, and shifty washout.

The Charles River article linked above goes in to each problem and possible soutions in depth.
Old Feb 19, 2013, 06:07 PM
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Adding about 1/4" - 3/8" washout did wonders for my Spirit in reducing tipstalls. Keeping the speed up helps too. That bird like to be flown fast in thermal turns and landing approaches.
Old Feb 19, 2013, 07:49 PM
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The sheeting doesn't do much. Washout is much more effective. It needs a lot.
Old Feb 19, 2013, 09:03 PM
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It may help to make the fin a bit larger, too. It's undersized, and that means it gets wiggly when you slow down. But of course, make sure you have some washout first, the same on both sides.

If I had one, I'd probably leave the fin the same size and make the fuselage a bit longer instead. But if I did that, I might have to rebuild the tail surfaces lighter to avoid having to put in too much nose weight. At some point I'd probably give up and build a Chrysalis or something.
Old Feb 20, 2013, 10:35 AM
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Quote:
Originally Posted by Al M View Post
The sheeting doesn't do much. Washout is much more effective. It needs a lot.
I had a fair amont of washout and no sheeting on mine and it worked pretty well.
Old Mar 18, 2013, 10:12 PM
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bobthefish50

Correcting Tip Stall in a 2M Spirit


Please see The attached thread:

https://www.rcgroups.com/forums/showthread.php?t=559452

Although I didn't mention it in this old exchange, the tip stall was afflicting my 2M Spirit. The correction, which worked immediately, was graciously provided by Mark Drela of the Massachusetts Institute of Technology.

Be well,

Bob
Old Mar 19, 2013, 01:50 AM
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One other thing to consider is that every turn in a R/E controlled plane begins with a skid. The combination of a high aspect ratio planform and slow speeds, makes skidding turns just about the most risky maneuver performed at low level.

Here's a link to a good article by Frank Reid about Skids on a full scale soaring site.

http://www.glider.org/

Go to: Individual Instruction Course page, then Skids article at bottom of page. Sorry, no direct link.
Old Mar 19, 2013, 05:20 AM
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always looking for clouds
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just fly faster id say.


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