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07-10-2020, 03:24 PM
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Join Date: Mar 2018
Location: Buena Park, California
Posts: 279
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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.
__________________
RV8 standard build: Empennage 99% completed
Wing -- Closed
Fuselage -- Canopy Started
Avionics Installation -- Bench tested
Firewall Forward -- New engine received !
Electrical -- After engine installation
Donation paid through 2020
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07-10-2020, 05:34 PM
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Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,166
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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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07-10-2020, 06:14 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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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?
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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07-10-2020, 09:28 PM
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Join Date: Aug 2009
Location: Southern California
Posts: 882
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Gust Loading
Quote:
Originally Posted by sailvi767
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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You probably shouldn?t rule out turbulence/gust loading as a contributor either....
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07-10-2020, 09:29 PM
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Join Date: Jan 2005
Posts: 959
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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=sharing Enjoy!
Last edited by RV8JD : 07-10-2020 at 09:34 PM.
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07-10-2020, 11:09 PM
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Join Date: Aug 2009
Location: Goodyear, Arizona
Posts: 877
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Nice briefing Carl! This thread should be a sticky just so guys can find that easier.
__________________
Karl, Goodyear, Arizona (KGYR) ATP, CFII
RV-14A, Flying
Extra 330LX, Flying
RV-8, Sold
RV-7, Sold
Bearhawk 4-Place, Sold
=VAF= donor 2020
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07-11-2020, 04:35 AM
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Join Date: May 2005
Location: Boston, MA
Posts: 452
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Quote:
Originally Posted by RV8JD
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=sharing Enjoy!
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Excellent Carl. Thanks for creating and sharing.
Brian
__________________
Brian J.
Boston, MA
RV8 Based at ORH - Purchased
RV8 - The Project #83313 - Under Construction
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07-11-2020, 08:42 AM
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Join Date: Apr 2009
Location: Stockton, California
Posts: 296
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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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07-11-2020, 07:07 PM
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Join Date: Nov 2006
Location: Oklahoma
Posts: 672
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Quote:
Originally Posted by BillL
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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That's very interesting, Bill. I have an RV7 with the aluminum 7497 blended airfoil Hartzell and have never noticed mine do that.
__________________
Joe Schneider
RV-7, IO-360, BA Hartzell, N847CR
Flying since 2008
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