tonyplane(at)bellsouth.ne
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 Posted: Sun Jun 14, 2009 11:42 am Post subject: Zodiac XL Aileron Mass Balancing |
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“A number of individual Zodiac owners as well as government agencies have recommended the installation of traditional aileron mass balancing as a means to mitigate any risk of flutter with the Zodiac design. Based on the standard airframe design examined and on the GVT results and linear approach of the flutter analysis documented in this report, mass balancing for the ailerons of the CH601XL (see example Figure 24) or the use of spades (see Figure 25) is not needed or justified.
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While mass balancing of the ailerons is generally believed to prevent flutter, the extra weight associated with control-surface mass balancing could have negative consequences if not properly designed and/or supported. It is possible that modifications to the standard control system and/or basic airframe structure of the Zodiac could be necessary to properly install aileron mass balancing on the CH650E.
As any new modification (such as mass balancing) can potentially be associated with new “randomly excited non-linear vibrations”, it must therefore be “sound” (sensible) through logic and reasoning and effective as demonstrated through testing. Sometimes, if one does not know exactly what one is doing, one can make matters worse with a well-intentioned modification to an aircraft.
Hamburg, June 6, 2009”
FYI: Above From the CH601XL GVT Report, Pages 25 and 26.
GOTO http://www.zenairulm.com/FAQ/pdfdocs/CH601XL-GVT-June6.pdf
Tony Graziano
XL/Jab; N493TG; 501 enjoyable hours
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