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08-23-2012, 05:31 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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When using the engine hoist method, I run multiple nylon straps around the engine mount (at the top, actually) and around the crank (just aft of the starter ring). So, it's kind of a three-point hoist.
Greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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08-23-2012, 05:53 PM
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Join Date: Jan 2006
Posts: 307
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What is the benefit of mounting the pants in flying attitude as apposed to
Standing on the ground.
Thanks
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08-23-2012, 06:26 PM
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Join Date: Oct 2005
Location: Melbourne, Australia
Posts: 1,868
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Quote:
Originally Posted by tadsargent
What is the benefit of mounting the pants in flying attitude as apposed to
Standing on the ground.
Thanks
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You want the wheel pants and intersection fairings mounted "in trail" when there's no weight on the landing gear (ie no flex in the landing gear).... to simulate actual flight condition. That produces the least drag in flight. There's a lot of flex in the landing gear when the weight of the aircraft is on it. In other words, if you set up the wheel pants and intersection fairings to be in trail when the landing gear is loaded, they will certainly NOT be in trail once you lift off the runway. That will rob you of considerable speed.
__________________
You’re only as good as your last landing 
Bob Barrow
RV7A
Last edited by Captain Avgas : 08-23-2012 at 06:42 PM.
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08-23-2012, 06:46 PM
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Join Date: Jan 2006
Posts: 307
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The 8 gear are condiderably stiffer, is this true for them as well
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08-23-2012, 10:18 PM
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Join Date: Nov 2005
Posts: 1,256
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Just did this a few weeks ago on my -7A to fit wheel pants and gear leg fairings...2-ton engine hoist with straps to the upper part of the motor mount, and sawhorses underneath to stabilize and shim to level. I was nervous as ****, but my fellow builders were confident and it all worked just fine, no problems. We did not lower it back down fully onto the sawhorses, just enough to put a little weight on one under the aft spar to stabilize everything while we worked. Stayed that way for a day or so, then, back on the wheels. No worries at all.
Jacking anything other than wing jack points would worry me a bunch more than lifting via the motor mount. After all, that mount + the engine pulls you the rest of the plane all over the sky.. 
__________________
Steve "Flying Scotsman"
Santa Clarita, CA
PP-ASEL, ASES, Instrument Airplane
RV-7A N660WS flying!
#8,000
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08-24-2012, 01:07 AM
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Join Date: Jan 2005
Posts: 3,646
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Quote:
Originally Posted by Dan Langhout
Problem is, the plane is still in the shop and neither the wings or tail is on - so I can't jack using the wing lift points plus it appears the CG is pretty far forward of the wing spar attach structure in this configuration which would make it difficult to jack at that location.
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Dan-
I felt more comfortable jacking up the plane under the spar. Like you, I worried a bit about the fwd c.g. with the engine on but no wings or tail. What I did, then, was build a 2x6 box to put under the spar, jacked it up there with two car jacks, but also had an engine hoist on the mount to make sure the nose couldn't drop. Worked pretty well.
FWIW, I have to do it again because I didn't align my wheel pants before getting the wings on and flying, but it's probably time to do after flying for a few hours. I'll probably lift the plane the same way again because I'm not convinced that lifting pretty much the entire weight of the plane on two tapped-in-aluminum tie down points is a great idea.
__________________
Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto
Donation reminder: Jan. 2021
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08-24-2012, 01:24 AM
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Join Date: Jan 2005
Location: Santa Clara, CA
Posts: 204
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2X4, countersunk holes to clear the tank vents. This locates the 2X4 and keeps it from moving. I used carriage bolts and a washers (so the head of the carriage protrudes) for jack pads. Works great. I can email a close up of the 2X4 jack pad, just have get to the airport and take a picture.

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RV6 built and flying
Bearhawk Patrol plans purchased
Last edited by AMURRAY : 08-24-2012 at 01:49 AM.
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08-24-2012, 07:34 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,653
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Quote:
Originally Posted by skylor
Lycoming specifically recommends against using the engine lifting ring to lift the weight of the engine and airframe. I suspect that case damage can result from overloading this lifting point...that would be a very expensive mistake!
I have used the engine mount cross tube multiple times without trouble.
Skylor
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A fair point brought up by you and Sam. I certainly wouldn't suggest lifting the entire airframe or even just the entire fuselage by the engine hoist ring. But lifting one end of the fuselage, sans wing and tail, will not harm a case that is designed for much higher loads. Nor do I suggest that the airframe remain suspended for a long period; just long enough to get it on/off the sawhorse.
Actually, best practice would seem to me to be to remove the engine and then hoist by the engine mount. That reduces the stress on both the mount during the lift and the airframe when it is on the jacks/sawhorses.
__________________
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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