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dlm46007(at)cox.net
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 Posted: Sat Apr 05, 2008 3:01 am Post subject: Jack Stands |
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From: David McNeill [mailto:dlm46007(at)cox.net (dlm46007(at)cox.net)]
Sent: Saturday, April 05, 2008 3:47 AM
To: 'rv10-list(at)matronics.com'
Subject: RE: Jack Stands
I see a couple of potential problems with your design.
(1) Standard aircraft jacks have mechanical locks and don't depend on hydraulics to hold in place after the lift.
(2) The lift appears to be made and supported only on the steel bolt into aluminum threads; on our QB wings there was a .100 gap between the skin and the bottom of the fixture; the choice was enlarge the hole in the skin or use a block of wood suitably padded with baffling material against the spar. We chose a block aligned along the main spar. BTW, the jack pads that Van supplies should be trashed. They are made of nylon and would engage at most four threads. How Vans can supply a short nylon fitting to support a 100K+ machine amazes me.
(3) wood will become dry and brittle over time and should be checked regularly.
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From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] On Behalf Of Albert Gardner
Sent: Wednesday, December 19, 2007 10:22 PM
To: rv10-list(at)matronics.com
Subject: Jack Stands
Being a sort of cheap frugal type I made these stands out of $12 worth of ¾ plywood and 2 long rams from Harbor Freight on sale.
Seems to work OK. (base is 18” square.)
Albert Gardner
Yuma, AZ [quote][b]
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Albert Gardner
Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ
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| Posted: Sat Apr 05, 2008 7:13 am Post subject: Jack Stands |
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The comments directed toward my wooden base design jackstand (photo attached) are all valid.
Mechanical locks seemed unnecessary because the only use so far has been to lift the mains just clear of the surface in order to align the wheel pants. I also changed a tire once but immediately placed blocks under the axle. The plane is supported entirely with the bolt which screws in about an inch and a half. On the other hand that’s the same amount the tie-down ring screws in also. I don’t think I’d use this design if I was going to go into the jackstand business but it did seem adequate for personal use and cost about $90 for a pair using Harbor Freight rams. In some ways it’s better than the commercial designs I looked at because the bolt screws into the tiedown ring support and goes into a hole in the top of the ram so it can’t slip off unlike some expensive designs I’ve see in use. “NOTICE: DON’T TOUCH THE PLANE-IT’S ON JACKS!”
Albert Gardner
Yuma, AZ
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RV-9A N872RV
RV-10 N991RV |
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Sat Apr 05, 2008 8:51 am Post subject: Jack Stands |
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Our aircraft at work require mechanical locks be set any time we walk away from the jacks. 1 minute, 1 hour, 1 day. When a jack lifting mechanism fails the lock is the last line of protection. The mechanical lock is a safety feature and our employer tells the FAA that “Safety is #1”.
The instructions and procedures for Jacking an Aircraft are just like doing a preflight run-up. The design of the equipment can be simple, the cost of construction inexpensive. The result, now that is important when it’s my invested capital. YMMV.
John Cox
Oregon
Do not archive
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Albert Gardner
Sent: Saturday, April 05, 2008 8:08 AM
To: rv10-list(at)matronics.com
Subject: RE: Jack Stands
The comments directed toward my wooden base design jackstand (photo attached) are all valid.
Mechanical locks seemed unnecessary because the only use so far has been to lift the mains just clear of the surface in order to align the wheel pants. I also changed a tire once but immediately placed blocks under the axle. The plane is supported entirely with the bolt which screws in about an inch and a half. On the other hand that’s the same amount the tie-down ring screws in also. I don’t think I’d use this design if I was going to go into the jackstand business but it did seem adequate for personal use and cost about $90 for a pair using Harbor Freight rams. In some ways it’s better than the commercial designs I looked at because the bolt screws into the tiedown ring support and goes into a hole in the top of the ram so it can’t slip off unlike some expensive designs I’ve see in use. “NOTICE: DON’T TOUCH THE PLANE-IT’S ON JACKS!”
Albert Gardner
Yuma, AZ
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dougpflyrv(at)aol.com
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| Posted: Sat Apr 05, 2008 8:54 am Post subject: Jack Stands |
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I RECENTLY FOUND THIS JACK & STANDS ON BARNSTORMERS.COM. PLAN TO ORDER THEM MONDAY. THEY ARE SMALL & LIGHT ENOUGH TO CARRY ON BOARD.
RV JACK AND JACK STAND • AVAILABLE FOR SALE • Jack and a pair of Jack Stands to service the wheel, tires and brakes This a Jack system it comes with a 4 ton Bottle Jack. Don't risk damaging your wings. The aircraft is very stable sitting on the stands. They are made from stainless steel that is laser cut and TIG welded. $150 • Contact Sonny Poarch - SKUNKWORKS located Weirsdale, FL USA • Telephone: 352 269-4370 • Posted March 25, 2008 • Show all Ads posted by this Advertiser • Recommend This Ad to a Friend • Email Advertiser • Save to Watchlist • Report This Ad • View Larger Pictures
 
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Albert Gardner
Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ
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| Posted: Sat Apr 05, 2008 11:29 am Post subject: Jack Stands |
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Aircraft Spruce- and I think Van’s also-sell an RV Jack that slips in the hollow axle after the nut comes off as this one does. A small bottle jack is then used to lift the plane far enough to change a tire. It looks like this jack works the same but also includes a stand. Having had a couple of flat tires I can point out some difficulties that need to be overcome. - With a flat tire the wheel pant is going to be against the ground hiding the lower screws. A wing jack works well but none of these axle jacks will work until you get the pant off. I installed hex headed screws in the lower position of the pant but it’s still tough to get them out and the pant off with a flat tire. On the front you just need to accumulate enough weight to hold the tail down for tire repair. A wing jack will have to lift a lot farther than an axle jack to get the wheel clear of the ground. A 2 ton bottle jack is sufficient if it has the required stroke length.
- After the wheel is removed you need to hold the plane up. I carried some short pieces of redwood 2x4”s, stacked them up a placed under the axle after the wheel was removed. Some redwood is very light and I kept the redwood and the RV jack in the plane. Looks like this jackstand would do the trick also.
- You probably will need some help from others to do any tire repair or replacements other than patching and filling a tube so maybe you could lean on them for the jacks and stands also saving yourself money and the trouble of carrying stuff around. One flat tire was at Albany, OR and needed a tube and tire and happened in front of the FBO, the other was at Needles, CA on a VERY HOT day and (the baggage carpet came in very handy) required a tube although a patch may have worked as a temporary fix. In both cases air was required so a hand pump and gage are necessary items in your tool kit. Remember you need tools to remove and split the wheel also.
- So, how much are we going to carry? Jacks, tools, tubes, tires, etc. Or, keep this stuff at home, throw yourself on the mercy of fellow avnuts when you travel, and when RV’s (or other less fortunate home builders) in trouble land at your home field you can save them.
Albert Gardner
Yuma, AZ
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RV-9A N872RV
RV-10 N991RV |
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