I bought a set of Lado actuators that were a drop in fit to replace the air cylinders on some robart 622 retracts in an 86" warbird. The system at the time used a controller that allowed the stagger to be adjusted, but I found the amount of time for up/down to be too slow. What I also found was that because electronics shut down when resistance builds up, the retracts don't do a good job of working reliabily when they are asked to pull a door closed or push a door open. In my case, I have a Kawasaki Ki 61 Tony that uses a mechancial linkage to pull the inner doors closed when the wheel comes up into the well. I found that the resistance shutoff would shut off the retract before it was fully retracted.

I don't know if this has been improved/changed or what, but I ultimately took these actuators back out and put air back in. They did work, but they were very slow - somewhere between 5-10 seconds for a cycle and they could not operate mechancially linked inner doors without shutoff.

Just my own experiences.

Jeff Lovitt