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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
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 Posted: Wed Jun 30, 2010 7:01 pm Post subject: Jacking Point |
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Okay, so I'm sure this has been asked a few times already, and I should search the archive, but what the heck, let's start a new thread.
I got my new tires today (Goodyear Custom Flight III, btw. Super sweet.) and started looking for ways to get them on. I can really only see two ways to jack the plane up easily with a normal jack.
1) I could put a short saw horse under the wing tie down and then put a hydraulic jack on it and lift the side of the airplane up by this point. If I just gently lift the plane by hand at this point, it seems like that's an awful lot of weight to be lifting that far out on the wing. Can the spars really handle this?
2) I could put a saw horse under the lower engine mount bolt to the firewall and use a hydraulic jack to lift the plane up. This seems less scary, but I question the shear strength of the bolt lifting all of the weight by this single point.
What's the convential wisdom on jacking a tail dragger RV-8 to change the tires? There has to be a way with out building some elaborate dolphin contraption.
BTW, with regards to my tire wear, since there's a fair amount of camber(?) afforded by the Grove gear, I've got nearly all the wear on the outside 50% of the tread. I could probably rotate them 180 degrees and get another 70 hours of flight time, which wouldn't be bad for 22-year old stock kit tires from Van's (remember, I swiped them from the RV-4 project after the brake incident). But, I probably should have rotated them a bit sooner. While there's not cord showing, the tread is gone. Live and learn; I'll be rotating these GYCFIII's in a more timely manner. If I can double my wear life by rotating because of the camber, I might get 1000 hours out of these babies! 
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: Enjoying The Fruits of 2500 Hours of Labor!
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donkeyvet(at)aol.com
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| Posted: Wed Jun 30, 2010 8:08 pm Post subject: Jacking Point |
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Matt,
I modified a tall Harbor Freight hydraulic jack at the top to accomodate a screwed in tie-down ring. Tall enough to nix the saw horse. Seems to work great. Seems like a 6g wing can handle some gentle jacking at that point. Chock all of the wheels. E-mail me (at) donkeyvet(at)aol.com (donkeyvet(at)aol.com) if you want a picture of the modification. Dennis Flosi
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Speedy11(at)aol.com
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| Posted: Thu Jul 01, 2010 6:51 am Post subject: Jacking Point |
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Matt,
That explains the tire wear better. Mine did the same thing on an 8A and I flipped the tires at about 60 hours to extend the wear. Even with the tread gone on one side it is evening up nicely now. Time for to order my GYs.
I used a HF cheap jack to make an airplane jack much as Dennis Flosi did. Mine is an 8A, though. Sounds like Dennis is doing fine with the same device and his is an 8. You can see photos of my jack at http://www.rv-8a.net/2010Mar.htm.
Stan Sutterfield
| Quote: | BTW, with regards to my tire wear, since there's a fair amount of camber(?) afforded
by the Grove gear, I've got nearly all the wear on the outside 50% of the
tread. I could probably rotate them 180 degrees and get another 70 hours of
flight time, which wouldn't be bad for 22-year old stock kit tires from Van's
(remember, I swiped them from the RV-4 project after the brake incident). But,
I probably should have rotated them a bit sooner. While there's not cord showing,
the tread is gone. Live and learn; I'll be rotating these GYCFIII's in
a more timely manner. If I can double my wear life by rotating because of the
camber, I might get 1000 hours out of these babies!
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[quote][b]
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