Wingtip staling - RC Groups
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Feb 14, 2013, 03:40 PM
Registered User
Zachb657's Avatar

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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Feb 14, 2013, 03:48 PM
Spy's sappin' my thermal!
Chris Sutton's Avatar
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:
Feb 14, 2013, 07:39 PM
It's gonna be YUGE!!!
LVsoaring's Avatar
Have you checked your washout?
Feb 14, 2013, 07:57 PM
auto-tune remix
slopemeno's Avatar
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.
Feb 16, 2013, 01:05 AM
Registered User
Dennis Everett's Avatar
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 ...
Feb 16, 2013, 12:57 PM
Loopie/Zoomie ≠ Soaring
superskeg's Avatar
Last edited by superskeg; Oct 11, 2013 at 07:10 PM.
Feb 17, 2013, 06:51 PM
Registered User
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.
Feb 19, 2013, 03:05 PM
AMA 353531
rdeis's Avatar
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.
Feb 19, 2013, 06:07 PM
Registered User
R2R's Avatar
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.
Feb 19, 2013, 07:49 PM
Registered User
The sheeting doesn't do much. Washout is much more effective. It needs a lot.
Feb 19, 2013, 09:03 PM
Registered User
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.
Feb 20, 2013, 10:35 AM
AMA 353531
rdeis's Avatar
Originally Posted by Al M
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.
Mar 18, 2013, 10:12 PM

Correcting Tip Stall in a 2M Spirit

Please see The attached thread:

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,

Mar 19, 2013, 01:50 AM
Registered User
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.

Go to: Individual Instruction Course page, then Skids article at bottom of page. Sorry, no direct link.
Mar 19, 2013, 05:20 AM
always looking for clouds
socommk23's Avatar
just fly faster id say.

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