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03-25-2009, 06:59 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,145
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"Wet Dog Shake" how much?
I am in the baffle trimming process right now. Getting ready for plenum layup. Can somebody tell me how much approximately the engine vibrates during start up and shut down? I need to figure out safe distance from upper cowling to the plenum to prevent touching and chafing. Do you guys notice how many feet  up and down your engine moves within the cowling? |
03-25-2009, 08:00 PM
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Join Date: Nov 2006
Location: Cumming, GA
Posts: 610
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baffling instructions?
The instructions on my -7 baffle kit said about 3/8" - 1/2".
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03-25-2009, 08:07 PM
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Join Date: Jan 2005
Location: Near Scipio, in Southern Indiana
Posts: 1,779
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I may be wrong, but it seems to be proportional to the weight of the prop.
Bob Kelly
__________________
Bob Kelly, Scipio, Indiana
Tech Counselor
Founder, Eagle's Nest Projects
President, AviationNation, Inc
RV-9A N908BL, Flying
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03-26-2009, 07:17 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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If you don't have enough room, it will rub and let you know during your test period. There will be black marks from where it is rubbing. Just file it down in those spots and you should be good. Don't let it go too long or it will cut through.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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03-26-2009, 07:51 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Quote:
Originally Posted by videobobk
I may be wrong, but it seems to be proportional to the weight of the prop.
Bob Kelly
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Bob is correct. A heavy prop increases the "shake" quite a bit.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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03-26-2009, 08:08 AM
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Join Date: Jan 2005
Posts: 1,009
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Once you start flying, be sure to check the clearance of the exhaust pipes to the motor mount (near lower cowl exit). My pipes were making contact, and only a few start/stop cycles managed to inflict some damage to the mount.
Terry, CFI
RV9A N323TP
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03-26-2009, 10:10 AM
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Join Date: Aug 2005
Location: Virginia Beach, VA
Posts: 474
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Terry,
Were the damages just cosmetic (rubbed the primer off) or did it actually damage the mount somehow?
__________________
Tim Ribble
Virginia Beach
RV-6A (only took 13 years to build  )
N621TR In unrestricted operation
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03-26-2009, 03:51 PM
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Join Date: Jan 2005
Posts: 1,009
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Actually hammered flat spots into the mount. Had an inspector look at it and pronounce it still fit. However, if I had allowed it to continue, I'd be looking at a welding project. BTW, my first attempt at realignment resulted in the pipes making contact with the bottom lip of the fuselage (marks on the pipes). I now have over .5 inches of clearance all the way around. This all happened after the prop was dynamically balanced.
Terry, CFI
RV9A N323TP
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