translate linear motion into a rotation

[nearbeer]

Thank you for your time and looking at my post. I have a rotisserie that I am building for my 65 Mustang Restoration. I was able to score some small hyd. cylinders from my work that were laying around; it led me to think that I could use them to rotate the support arms at each end of the car 90 deg to access the bottom of the car for floor pan repairs. I plan on welding a support bracket and stop on the vertical tubes that will support the hinge/arm. From there, I am lost in the sauce on how to translate the linear movement of the hyd. cyl. into a rotation. I thought about some type of variable radius arm made out of flat bar (like the cam/radius arm that you see on Nautilus gym machines) but I have no idea if that would work or not. Any advice is greatly appreciated.

In search of my next cold one,

NearBeer

[cadcamdave]

Perhaps a spur gear on the pivot axis, and a length of gear rack attached to the cylinder...