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04-22-2012, 07:00 PM
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Join Date: Feb 2005
Location: Arvada, CO
Posts: 39
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Another Harbor Freight Jack
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04-22-2012, 07:04 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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FWIW, I drilled holes in the base of the jack and bolted it down. I like the welded versions a lot, but have zero welding skills.
Greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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04-22-2012, 07:27 PM
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Join Date: Oct 2007
Location: Macon, GA
Posts: 499
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Seems like the shorter, $18 bottle jacks would work just as well, assuming you made a taller stand. Any reason why not? I'd think 6" of lift would be more than enough?
http://www.harborfreight.com/4-ton-h...ack-66450.html
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Macon, GA (KMCN)
RV-7, Niner Fife Victor
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04-23-2012, 05:06 AM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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Really cheap.
Mine are simply two concrete blocks with a flat piece of wood on top, then the usual bottle jack borrowed from my bench press.
Fred Flintstone kinda deal! Jack both my -6A and -10 with them.
Best,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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04-23-2012, 07:24 AM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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Quote:
Originally Posted by gtmule
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I have two of the shorter bottle jacks and, yes, they work but barely. There's a lot of spring in those legs. MUCH more convenient to have the longer throw and not require boxes or cinder blocks etc. underneath. In addition, when I change from small to large wheels/tires, the smaller jacks were not sufficient (probably not a lot of others out there doing that though!).
Greg
__________________
Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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04-23-2012, 07:35 AM
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Join Date: Sep 2007
Location: WA
Posts: 988
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resistance to overturning...
Beware of using a small jack on blocks, there is not much resistance to overturning with a small jack fully extended... It takes a surprising length of extension to get the wheel in the air and there is some positional movement of the jack point, especially with a tail dragger with the the tail on the ground.

__________________
Stephen
RV7 powered by a lycoming thunderbolt IO-390
turning a whirlwind HRT prop
with more hours flying than building... 2,430 on the hobbs!
ORCA Flight
Race 771
margarita!
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05-15-2012, 03:21 AM
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Join Date: Mar 2009
Location: Virginia
Posts: 37
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Jacks are...
$40 online right now. Might have to do this just as a side project, or to at least have the jacks handy for future use.
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05-15-2012, 06:30 AM
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Join Date: Jan 2011
Location: Adelaide South Australia, Australia
Posts: 193
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From the number of people doing it I guess it is o.k. but are the two tiedown points strong enough to support the weight of the whole aircraft?
Quote:
Originally Posted by Mike S
I built these a year + ago, have worked well for me.
I welded the jacks to steel plate, about 14" square, 3/8" thick.
Bit heavier than the ones shown at the start of the thread, but totally no way they are going to tip over in normal use.

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Mike I see in your Picture you are jacking from a fueslage point near the undercarrage. Exactly where is that point?
Jim
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05-15-2012, 07:36 AM
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Join Date: Mar 2007
Location: West Texas
Posts: 282
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Jack stands
The idea has been around for a while ever since Harbor Freight has had the cylinder jacks available at a reasonable price.
I made these eight years ago, for use in certified aircraft that were significantly heavier than RVs. A little over the top but they will probably last as long as the cylinders will hold up.
One accessory I did not add was some small casters on one end so that the stand can be tilted slightly and then rolled under the wing. They are pretty heavy to drag around.
Dave A.
6A build
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05-25-2012, 09:17 PM
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Join Date: Jan 2005
Posts: 3,646
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This is probably a dumb question, but although I know jacking at the tie down point is common, is the tie down point strong enough to hold +/- 500# of plane all in that one point on regular basis? Usually it's one bolt on the jack going into the tapped extruded aluminum tie down bracket which, in turn is attached to the spar with nothing more than 4 AN3 bolts. Seems like a failure either in the treads, bolt, tie down bracket, and/or spar would be quite problematic. Just curious.
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Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto
Donation reminder: Jan. 2021
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