John,

That is a really scary photo!  But, I will say that you have your CG figured out for sure.

Sent from my iPad

On Oct 28, 2013, at 12:36, John Barrett <jbarrett@carbinge.com> wrote:

> Hi Greg,
>
> I made my jacks from Harbor Freight hydraulic cylinders with flat bottoms
> and welded up stands around them.  A lot of work and the cylinder hydraulics
> don't hold up all that well.   Also they are not as stable as the expensive
> commercial ones.  We were jacking up the plane outside for gear checks in
> Redmond a couple years ago and light winds were really scary.  I only use
> inside the hangar since then and have modified them to make them a little
> more stable.  They are workable and now I'm pretty comfortable with them,
> but investing in some good ones is not a bad alternative.  The aircraft  has
> to go up so high and the jack points are close enough together that light
> lateral forces will cause things to sway and wobble - makes me pucker
> sometimes.  
>
> The episode in the photo was on concrete apron that was not at all flat -
> that added to the instability and was not a good plan.  
>
> John Barrett
> N31VP
>
>
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