COBRA Hydraulic Jack

I built one of Jay's jacks many years ago with his parts list, pictures and prints.

It works great and is very robust.

Richard
www.craggyaero.com

On Sunday, November 22, 2020 at 9:01:16 AM UTC-8, Richard Pfiffner wrote:
I built one of Jay's jacks many years ago with his parts list, pictures and prints.

It works great and is very robust.

Richard
www.craggyaero.com

If you need more clearance in the lowered position a double-acting bottle jack is the answer:
https://www.northerntool.com/shop/to...E&gclsrc=aw.ds

Tom

On Sunday, November 22, 2020 at 6:08:23 PM UTC-5, 2G wrote:
On Sunday, November 22, 2020 at 9:01:16 AM UTC-8, Richard Pfiffner wrote:
I built one of Jay's jacks many years ago with his parts list, pictures and prints.

It works great and is very robust.

Richard
www.craggyaero.com
If you need more clearance in the lowered position a double-acting bottle jack is the answer:
https://www.northerntool.com/shop/to...E&gclsrc=aw.ds

Tom

Just to keep the nomenclature straight: the link shows a two-stage telescopic cylinder and it is still only single acting, i.e. one can power it up but either a spring inside or the load will have to bring it back down. This is NOT a double acting cylinder which could be extended and retracted hydraulically.
This one will most likely only lift the designated 2t on the first stage, which is still way more than needed in this application here.

Uli
'AS'

On Sunday, November 22, 2020 at 7:09:45 PM UTC-8, AS wrote:
On Sunday, November 22, 2020 at 6:08:23 PM UTC-5, 2G wrote:
On Sunday, November 22, 2020 at 9:01:16 AM UTC-8, Richard Pfiffner wrote:
I built one of Jay's jacks many years ago with his parts list, pictures and prints.

It works great and is very robust.

Richard
www.craggyaero.com
If you need more clearance in the lowered position a double-acting bottle jack is the answer:
https://www.northerntool.com/shop/to...E&gclsrc=aw.ds

Tom
Just to keep the nomenclature straight: the link shows a two-stage telescopic cylinder and it is still only single acting, i.e. one can power it up but either a spring inside or the load will have to bring it back down. This is NOT a double acting cylinder which could be extended and retracted hydraulically.
This one will most likely only lift the designated 2t on the first stage, which is still way more than needed in this application here.

Uli
'AS'
The lift height you will need depends upon what is needed to extend the gear fully and still clear the ground. This is glider dependent, but will likely be more than what the first stage can produce. And, more importantly, it has a lower profile to allow the fuselage dolly to be well below the glider's nose. This is critical for positioning the glider to be jacked up. Again, this depends upon the individual glider's ground clearance.

Tom