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SteveJeff
Joined: 28 Dec 2012 Posts: 1
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Posted: Sat Dec 29, 2012 3:50 am Post subject: Not mass balanced ailerons & cable failure |
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I found that many certified LSA aircrafts and some standard FAR 23 certified don't have mass-balanced surfaces, especialy ailerons. I'm interested in how they are designed to show freedom from flutter, especially control surface flutter and if these aircrafts can handle a disconnected freefloating aileron emergency (due to cable failure, for example).
If they are not prone to develop flutter in normal operation, how things may change if, for example, the aileron cable fails?
The limited speed of LSA is a big factor to avoid flutter in normal operation, so it may not be necessary to have mass-balanced surfaces. In normal operation, the aircraft was flight tested for flutter and also in normal service there were no flutter occurences.
However, the question is, how things change in a cable failure in these aircrafts? Even if it's a very rare occurence, from time to time cables may fail. I'm wondering especially about an aileron cable failure, when the aileron is disconnected and freefloating, how prone is to flutter? In this scenario, is it at risk to (violently) flutter?
As about FAR 23 aircraft, for example, American Champion series (Scout, Citabria..) have no mass-balanced surfaces, especially ailerons.
I hope it wasn't too hard to follow my post, I'm sorry, I was a bit in a hurry writing it. Thank you so much!
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Griswald3
Joined: 06 Feb 2014 Posts: 2
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Posted: Thu Feb 06, 2014 8:30 pm Post subject: Re: Not mass balanced ailerons & cable failure |
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Thanks for the post!
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garryd
Joined: 10 Dec 2015 Posts: 5 Location: Ithaca, NY
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Posted: Wed Jan 13, 2016 3:29 am Post subject: Re: Not mass balanced ailerons & cable failure |
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Great to know info about not mass balanced ailerons & cable failure...
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