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05-11-2014, 09:15 AM
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Join Date: Feb 2005
Location: Victoria B.C.
Posts: 1,266
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Performing Loops
I was up doing loops and rolls the other day with a average size guy(180 lbs).
At the top of the loop just before easing the back pressure off it felt like and sounded like someone hit the tail of the plane with a two by four. I landed and inspected the tail section, no damage or cracks. Tried again with different entry speeds and still this happened. I have never experienced this before have any of you? OAT was around 65 and alt. was 5500 asl.
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05-11-2014, 09:33 AM
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Join Date: May 2014
Location: Friendswood TX
Posts: 218
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Were you doing multiple back to back loops. Maybe hitting your own prop wash? In other aircraft I've done it in level turns, but never vertical.
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05-11-2014, 09:42 AM
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Join Date: Feb 2005
Location: Victoria B.C.
Posts: 1,266
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No it happened on the first loop and I was already almost completely inverted easing the back pressure off. I have hit my own turbulence before horizontally and vertically and feeling was not the same.
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05-11-2014, 09:43 AM
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Join Date: Apr 2006
Location: Ottawa , Canada
Posts: 224
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You probably have thought of this already.... but did you look for an unknown object floating around in your tail area that came loose?
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Chris Hepburn
Ottawa, ON
RV-8 C-GOGO FLYING
Renew 12/20
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05-11-2014, 09:49 AM
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Join Date: Feb 2005
Location: Victoria B.C.
Posts: 1,266
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Yes, I did look, there were no loose objects.
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05-11-2014, 09:59 AM
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Join Date: Mar 2010
Location: USA
Posts: 454
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Loose item in baggage compartment? I cannot think of anything except for a sizable piece of FOD that started floating around once you got into zero G territory at the top of the loop.
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05-11-2014, 10:00 AM
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Join Date: Apr 2006
Location: Lantz,Nova Scotia ,Canada
Posts: 556
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Check for oil canning on the bottom skin of the fuselage. I had a similar sound and that's what it turned out to be. It got my attention the first time or two.
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Paul Tuttle
RV 8
C-FPVT
Flying.
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05-11-2014, 10:12 AM
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Join Date: Jun 2011
Location: Moose Jaw, SK, Canada
Posts: 550
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When I was training in my old Cherokee 140 I would get a "bang" whenever we did a spin, and the top bulkhead panel separating the cabin from the tail cone would pop out. Happened every time, and definitely seemed to be a little oil canning in the fuse.
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Gerry Julian
Moose Jaw Saskatchewan
RV6A "Second Wind" C-GERZ (born N242UL)
O-360 A1A, Sensenich FP prop
Those who think any system is foolproof greatly underestimate the ingenuity of fools
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05-11-2014, 10:24 AM
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Join Date: Oct 2005
Location: Vancouver, WA USA
Posts: 908
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Quote:
Originally Posted by Norman CYYJ
I was up doing loops and rolls the other day with a average size guy(180 lbs).
At the top of the loop just before easing the back pressure off it felt like and sounded like someone hit the tail of the plane with a two by four. I landed and inspected the tail section, no damage or cracks. Tried again with different entry speeds and still this happened. I have never experienced this before have any of you? OAT was around 65 and alt. was 5500 asl.
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I outlined the key, low airspeed wile still loaded, the tail stalled, been there done that. More speed on entry and a little more G at entry will get you to the top before it slows to a stall speed. this happens a lot easier two up then solo.
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05-11-2014, 10:48 AM
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Join Date: Mar 2010
Location: USA
Posts: 454
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Quote:
Originally Posted by Russ McCutcheon
I outlined the key, low airspeed wile still loaded, the tail stalled, been there done that. More speed on entry and a little more G at entry will get you to the top before it slows to a stall speed. this happens a lot easier two up then solo.
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I'm unclear on what you are connecting, or what a "tail stall" is. You can stall, buffet, and snap airplanes every which way and not hear banging in the airframe. Oil canning is a good thought. Though this is definitely not a "typical" thing with RVs and aerobatics, no matter how you choose to fly through loops.
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