OK, everyone has made some good points. I’ll try to explain what led me to this solution. I needed to do a complete brake and wheel bearing job so I wanted both wheels off the ground while I did all this work, including replacing brake fluid and testing the whole system for leaks and proper brake pad movement.
1. Cost was a consideration with me. These stands were inexpensive to make. Rather than use 4x4’s I could have made the whole stand out of 2x4’s and doubled them wherever I thought they needed to be beefier - like the vertical legs. That would have lessened the cost a bit. Also, the Harbor Freight jacks are inexpensive. And you might could get by with only one.
2. I had tried the “Weights pulling down the tail” method using concrete blocks on a mechanics crawler, but I found it difficult to manage it alone. It’s easier to just slide the stand between the foot steps and jack it up.
3. Earlier I had tried to make a cheap hydraulic lift for lifting under the wing tie downs.
(A) I never came up with a good design that precluded the tie down ring from slipping off the jack.
(B) I just didn’t like the idea of that much weight pushing down on the aluminum threads that the rings were screwed into. Maybe I’m just being silly about that.
4. When both stands are in place holding the plane off the ground, there is a lot of downward force on those loose 4x4’s under the feet of the stand. It’s difficult to even kick them out from under the stands. However, a couple of 1/2 inch dowels in each one that protrudes about 1/4 or 1/2 inch and that mate with holes on the underside of the stand bases would make it more secure. I have no concern about the wind blowing the plane sideways since I’m in a hangar.
I appreciate everyone’s comments. I just wanted to throw this out there as “Yet Another Jack Idea” to be critiqued. I have found this design to be convenient and easy for one person to manage.
RV-12 N864RV 90 hrs TT
Donation Made for 2019
Last edited by JimMac : 05-14-2019 at 06:04 PM.
Reason: Add a sentence