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How To Prevent Flutter And Other Aeroelastic Modes
Ran across this article in Aviation Week. May require free registration/subscription to see. Very interesting on flutter.
https://aviationweek.com/business-av...oelastic-modes Also here are two embedded videos from the article on flutter Part 1 https://www.youtube.com/watch?v=rb3JHY_-ia4 Part 2 https://www.youtube.com/watch?v=jW8I2hX4GSs |
Interesting article and the Youtube links. There was a recent post about a F1 Rocket that lost most of the horizontal stabilizer but the pilot managed to land it safely. Scary stuff.
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The F1 Rocket that recently had the tail damage was above VNE however the failure appears to have been caused by a rapid G onset starting from a negative G value to above 8 G?s with a high onset rate. It does not appear to be flutter.
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I have had a prop/engine whirl mode with my 7, IO360 M1B engine w/Hartzell composite prop. The spinner moves 1/4" off center. It has occurred at low rpm after a gentle bounce on the runway. Has anyone else had this occur in an RV?
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Gust Loading
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Below is a link to a pitch I put together a few years ago. It describes different aeroelastic phenomena, including buffet, divergence, control reversal, control surface buzz, forced vibration, flutter, aeroservoelasticity; and discusses basic principles of flutter prevention.
"An Introduction to Airplane Flutter": https://drive.google.com/file/d/18nb...ew?usp=sharingEnjoy! |
Nice briefing Carl! This thread should be a sticky just so guys can find that easier.
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Carl,
The presentation, IMHO, is beyond excellent. I benefited from 15+ years of mentoring by John Thorp. After his passing I contacted Martin Holman (noted flutter expert) to reinforce John's position as various "modifications" were being explored by T-18 builders that my personal exposure led me to conclude they were not consistent with John's position. The push-back to my request to "think it over" was interpreted by many as "You have to do it my way" - even if I specifically stated otherwise. This presentation is the most "together" survey I've come across and I thank you for bringing together the concepts and teaching me what (except in limited circles) usually isn't taught! Thanks again! |
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