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  #1  
Old 01-31-2012, 03:30 PM
schristo@mac.com's Avatar
schristo@mac.com schristo@mac.com is offline
 
Join Date: Sep 2007
Location: WA
Posts: 988
Default a great way to spend 45 dollars... put together a wing jack stand

I have been looking for a better solution to jacking up the wing for some time... I have been using a jack arm arrangement that slips into the axle but it is really a marginal solution; it is a bit pricey, takes way too much effort just to lift a wheel, and is in the way during maintenance. So, for a while I contemplated ordering a commercial wing stand... while they are pretty nice, they run around well north of 200 dollars plus shipping. Doing a bit searching on VAF there are several scattered examples of an inexpensive solution that I mined for ideas.

Parts that I used:
From Harbor Freight, a 3 ton super heavy duty long ram hydraulic flat bottom jack for a whopping 40 dollars (I even had a coupon for 10% to level off the tax).
From Lowe's, a 3/8-16 x 3" carriage bolt, lock nut, a 3-1/2" hose clamp, 1" steel pipe cap, and a single 10' stick of 1/2" emc for about 5 bucks.

I had a good piece of plywood in the hangar to make a 18"x18" base, and I just used some #10 cs screws that were left over from the build.

Set the jack in the center of the board oriented so that the pump arm is easy to access. Measure the desired length for the conduit support legs. Cut them and squeeze the ends in a vice, bend the ends to sit flat. Drill the base and supports, attach hardware... I used some gorilla tape at the top to cover any rough edges.



I drilled a slightly oversized hole in the pipe cap for the carriage bolt to nestle down into and tightened down a nyloc nut so the cap will just jiggle.



Thread the cap assembly into the tie-down.


Jack away


This works so well I really wish that I did it long ago...
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  #2  
Old 01-31-2012, 03:34 PM
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Mike S Mike S is offline
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Location: Dayton Airpark, NV A34
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Default Good idea, but....

Just a thought here, but I would cut off the excess bolt length, as it will make it stronger.

There maybe little to no chance of this bending, but why give it any extra help??



With the angle shown, the longer the bolt unsupported, the weaker it is.

Imagine what would happen if the bolt were a foot long
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Last edited by Mike S : 01-31-2012 at 03:37 PM.
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  #3  
Old 01-31-2012, 04:22 PM
humptybump humptybump is offline
 
Join Date: Feb 2011
Location: USA
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Default

Other than Mikes suggestion, I like this setup ! ... probably enough to make one of my own
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  #4  
Old 01-31-2012, 04:55 PM
scsmith scsmith is offline
 
Join Date: Jan 2008
Location: Ashland, OR
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Default a lttle bit worried....

about just having that hose clamp around the top of the braces. Would not take much side load to make that slip, or make one of the diagonals slip out from under it.

Maybe pin the diagonals to the clamp somehow? rivet them? just thinking out loud here....

Is there anything fixing the base of the jack to the plywood?
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  #5  
Old 01-31-2012, 05:19 PM
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Geico266 Geico266 is offline
 
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Location: Huskerland, USA
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Default

If you look carefully at the top of my jack I drilled a 1/2" hole about 1/4" deep. Then took a 3/8-16 socket head cap screw and rounded the head on a grinder to fit the hole in the top of the jack.




I stole the idea from a guy in KC about 6 years ago. I welded my braces to the ring at the top.
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Last edited by Geico266 : 01-31-2012 at 05:24 PM.
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  #6  
Old 01-31-2012, 05:37 PM
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frazitl frazitl is offline
 
Join Date: Jan 2005
Location: Las Vegas, NV
Posts: 488
Default I have three

made almost exactly the same as Stephens about 6 years ago for our Mooney.
To solve the problem of attaching the support struts at the top, I found a
ring in the electrical isle at Home Depot with an ID big enough to just
swallow the jack body. I think it even had four flats around the
circumference to attach the strut tops with screws. Anyway, they work
great. I countersunk the top of the jack ram to deepen the hole, and just
use two cut off bolts in the tie down holes to provide secure jack points.

Only improvement I might make is to buy some lock rings available from industrial supply houses like McFaddin-Dale. Probably safer if you ever have to leave the plane on the jacks overnight...

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  #7  
Old 01-31-2012, 06:46 PM
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panhandler1956 panhandler1956 is offline
 
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Default

Very cool tip! Thanks for sharing!

I love the innovation in our group.
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  #8  
Old 02-01-2012, 03:57 AM
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NickAir NickAir is offline
 
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Default

I made similar jacks. Work great. Lock rings are a good safety idea.
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  #9  
Old 02-01-2012, 08:44 AM
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N8RV N8RV is offline
 
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Default

Quote:
Originally Posted by NickAir View Post
I made similar jacks. Work great. Lock rings are a good safety idea.
OK, I'll bite. What are lock rings?
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  #10  
Old 02-01-2012, 10:31 AM
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fl-mike fl-mike is offline
 
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Default

I'm still an advocate for reversing the design approach of the jack ram to wing tie down point.

I use a 1.25-1.5" twelve point socket and bolt that to the tie-down hole with a standard hex head bolt. Put the ram of the jack into the open socket and there is no way that is slipping off.
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