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Old 08-07-2022, 11:07 AM
David Paule David Paule is offline
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,421

Is anyone on the forums for non-RV aircraft? How did the other brands do?

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Old 08-08-2022, 07:57 PM
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simpkinsona simpkinsona is offline
Join Date: Dec 2010
Location: Vacaville, CA
Posts: 221
Default Overstress

Originally Posted by DanH View Post
Most of the rudder damage seen here is torsional overstress, not a failure of your gust lock. For rudders fixated with any type of lock which holds the rudder horns, directly or indirectly, the telltale is the kink in the trailing edge just above the bottom most rib.
A few months ago a similar thread went through this. I believe based on that thread and this one that all the failures were from the rudder hitting its stop with high velocity. All the damaged rudders that I’m aware of either had gust lock failures or or no locks installed. Most of the damaged rudders had witness marks from hitting the elevator. (Including one that had a gust lock that was claimed to have not failed).

I believe you are correct that all the failures were from overstress, but I believe that was from the inertia of the counterweight at impact.

I suspect it wouldn’t be hard for someone who knows how to calculate the torsional strength of the rudder to figure out a theoretical gust required to bend the rudder (I don’t have that knowledge).

Andy Simpkinson
RV-9a Subaru engine.

Last edited by simpkinsona : 08-08-2022 at 08:02 PM. Reason: Added paragraph
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Old 09-01-2022, 06:25 PM
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Malndi Malndi is offline
Join Date: Sep 2014
Location: Sydney Australia
Posts: 140
Default My thanks to Allan and James

I’ve had years of reliable service from my (red) antisplat gust lock bought in 2014, including standing up to a 3-day storm with 90 km/h winds. However this thread revealed that I had somehow slipped through the cracks and didn’t get the upgraded steel tube way back when it was introduced.

A message to Allan resulted in a replacement tube arriving here on the other side of the world, despite it being 8 years since the original purchase.

That’s impressive customer service and the gold standard in product support.

Last edited by Malndi : 09-06-2022 at 07:36 PM.
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