Yes, I mean force from the cylinder itself. I used the 1 1/2" throw Robart cylinders on the main gear doors. When the doors are open, the cylinders are at the end of their throw. That means that when the oddrs are closed, the cylinders still have around 1/4" or more of throw left. Thus, unless you put on a limiter (like a wheel collar on the piston) the cylinder is pulling on the door hinge with all its force when the doors are closed. That's good for keeping the doors closed during flight (trust me, they would open if the cylinders aren't holding them closed - at least some), but its also hard on the door hinge, and on the door-to-hinge glue joint. The 1/8" G10 sheet door hinge Aeropoxied to the gear door should easily be up to the task though.

Bob