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  #1  
Old 10-05-2019, 12:53 PM
mbauer mbauer is online now
 
Join Date: Nov 2015
Location: Nikiski, AK
Posts: 388
Default Project: Design RV-6 Tire Jack

Working on a creating a portable RV Jac.

Came up with a simple screw jack setup. Now working on getting it manufactured by a local fabrication shop.

Gone through several design changes, have a final edition that isn’t shown, it is over at the metal fab shop for a price quote. As you can see from the photos, I’m not the best welder….

The one that will be built will be close to the following prototype specs:
Weight: 1lb 0.1 oz
Height Before Extension: 4.5”
Height Extended: 7.25”
Base: 3” x 4” x 1/8” Mild Steel Plate
Tower: 1” square mild steel tube
Screw lift: ˝” All Thread

Normally would need a 7/8” wrench to work the nut, now using a square tube and some pins, trying to go tool-less as you can see in some of the photos. Clearing a flat tire/disc brake became a challenge with a couple of the designs.

Photos show some of the prototypes, there are more.

Photo of the best working ones, the one on the right had great promise, until it started leaning while it was being extended; lightest one of the group at 14.2oz, the handles at the bottom hit the tire when full or flat had to use the hose clamp again, it did raise the RV using just the handles to rotate:



This photo shows sliding under the axle. Problem with this jack was it could not be placed under the axle like designed for. Had to slide and lock it under the hose clamp further out. The tabs hit the disc brake…. It did miss the flat tire when it is under the axle, just couldn’t rotate the nut to extend it.


This photo shows the lift available to get the tire off the ground when full. Notice had to lift on the hose clamp due to the disc brake issue.



Another angle while extended.



A different prototype at work. This one cost quite a bit of money for the parts. Over 3lbs but can lift over 7”. Main/bottom thread and nut are from a pipe jack stand.



Trying to get the RV Jac under the axle on pavement and having enough lift was a challenge. In dirt it will be a non-issue, just use the base to scrape a pad.

Best regards,
Mike Bauer
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Mike Bauer
N999SN 1998 Syd Nelson RV-6 (purchased 2017)
UTC -09:00 Alaska
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  #2  
Old 10-08-2019, 08:55 PM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 1,858
Default

Funny timing, I was thinking of this same type of solution just the other day. Seems a screw jack is the most compact method. I was considering an aluminum body and steel screw.
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Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec), but donated early in Sep'19.
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  #3  
Old 10-08-2019, 09:16 PM
mbauer mbauer is online now
 
Join Date: Nov 2015
Location: Nikiski, AK
Posts: 388
Default

Quote:
Originally Posted by WingsOnWheels View Post
Funny timing, I was thinking of this same type of solution just the other day. Seems a screw jack is the most compact method. I was considering an aluminum body and steel screw.
Looked at aluminum as well for the "tower" part. Biggest issue for me is all the aluminum in town is 1" pipe or tube with .125" walls. The mild steel has .065 walls. The only real weight saving would be the base, both would be 1/8" thick.

I have enough aluminum to make several, but after looking at the savings, decided it would be easier to drill a couple of lightning holes in the mild steel tower. The aluminum I have was for a different project, but would work on this.

A couple of holes should get the weight down under 1lb. The final prototype weighed in at 1lb 0.1oz.

Best regards,
Mike Bauer
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N999SN 1998 Syd Nelson RV-6 (purchased 2017)
UTC -09:00 Alaska

Last edited by mbauer : 10-08-2019 at 09:26 PM.
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  #4  
Old 10-08-2019, 09:47 PM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 1,858
Default

Quote:
Originally Posted by mbauer View Post
Looked at aluminum as well for the "tower" part. Biggest issue for me is all the aluminum in town is 1" pipe or tube with .125" walls. The mild steel has .065 walls. The only real weight saving would be the base, both would be 1/8" thick.

I have enough aluminum to make several, but after looking at the savings, decided it would be easier to drill a couple of lightning holes in the mild steel tower. The aluminum I have was for a different project, but would work on this.

A couple of holes should get the weight down under 1lb. The final prototype weighed in at 1lb 0.1oz.

Best regards,
Mike Bauer

Makes sense. I have a metal supply house down the street and a 12x28 lathe, so I could make a custom part as needed.
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Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec), but donated early in Sep'19.
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  #5  
Old 12-09-2019, 10:21 PM
mbauer mbauer is online now
 
Join Date: Nov 2015
Location: Nikiski, AK
Posts: 388
Default RV6 Tire Jack Needs Tested

I plan to advertise and sell these RV6 Jacks.

At present I have one left that I would like to send to someone to test.

If you are interested in testing one; I need to know what feedback you will have, what you like/dislike about them, more than willing to send the last prototype to you for testing.

Please PM me and we can communicate to get it on the way to your location.

Photos show the completed prototypes. You will need to have a 7/8" wrench to operate the screw jack.

These are designed for 5.00x5 tires. Other sizes will need modification to fit under the axle and give enough lift.

Here are three photos of the prototypes, these were made while creating jigs to construct them for a production.






The prototype weighs in at 1lb, has two coats of zinc phosphate primer, three coats of Rust-Oleum Bright Coat Metallic Finish paint. The paint will be changed.

The Metallic Finish is not very durable, after drying for 48-hours it is soft and finger prints, scratches etc. show up like crazy. Clear coating did not work. Too bad as they look just like chrome when sanding with 1000 grit wet/dry for the final coat!

Interested? Please PM.

I've read where most carry spare tire and tubes, but not many have jacks. These should help change tires to get back in the air with just one person operation. Not that big, 3"x4" base, the tower is right at 4-1/2" high when retracted and weigh only 1lb.

Best regards,
Mike Bauer
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N999SN 1998 Syd Nelson RV-6 (purchased 2017)
UTC -09:00 Alaska

Last edited by mbauer : 12-09-2019 at 10:26 PM. Reason: Size of jack edit
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  #6  
Old 12-09-2019, 11:42 PM
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Vlad Vlad is offline
 
Join Date: Oct 2008
Location: Utah
Posts: 7,946
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I am interested Mike. Email on the way. Flying to some “interesting” airstrips without services I would love to have a jack like that.
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  #7  
Old 12-10-2019, 08:23 AM
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Bob Martin Bob Martin is offline
 
Join Date: Jan 2005
Location: Charlottesville, Virginia
Posts: 1,187
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Mike,
I can't seem to tell what the jack is lifting against.
You have nice pictures but the detail is not clear to me, meaning I don't understand what it is grabing or pushing/lifting against.

I like this idea as I am that flys without a jack and had experianced a flat away from home. not fun.
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RV-6, 0-360 Hartzell C/S, Tip up, 1200+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
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  #8  
Old 12-10-2019, 08:33 AM
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jeffkersey jeffkersey is offline
 
Join Date: Sep 2015
Location: Cottontown, TN
Posts: 252
Default Band Clamp?

Quote:
Originally Posted by Bob Martin View Post
Mike,
I can't seem to tell what the jack is lifting against.
You have nice pictures but the detail is not clear to me, meaning I don't understand what it is grabing or pushing/lifting against.

I like this idea as I am that flys without a jack and had experianced a flat away from home. not fun.
Looks like he has a band clamp around the gear leg just after it bends horizontal. I have been carrying a couple U-Bold to make something for a jack to hold on to...

Cool little Jack. How much are they going to sell for?
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RV7A Purchased Flying
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  #9  
Old 12-10-2019, 09:43 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 8,600
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Quote:
Originally Posted by mbauer View Post
I've read where most carry spare tire and tubes, but not many have jacks. These should help change tires to get back in the air with just one person operation. Not that big, 3"x4" base, the tower is right at 4-1/2" high when retracted and weigh only 1lb.
I really like the idea, but having to carry a (heavy) 7/8" wrench also, would be a deal breaker for me.
For most RV owners, the jack would be the only use for that wrench (I happen to have large barrel plugs that need it for the ign. lead nuts, but most don't) and it probably would double the weight penalty of hauling the jack (would need to call the jack weight 2 pounds instead of 1).

An alternative would be to get a quote on a water jetted aluminum open end wrench with a short handle that could be part of the jack "kit".
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Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #10  
Old 12-10-2019, 09:59 AM
FLY6 FLY6 is offline
 
Join Date: May 2010
Location: Burlington On. Ca
Posts: 117
Default 7/8 wrench

I believe many would carry a 7/8 wrench to change spark plugs. Though maybe that was his rational.
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Flying RV6, O-320, 160hp
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