Egor,

The Dubro hinges might just be the ticket. Then I could use my Great Planes Slot Machine and get a good job done. Here is a shot of the bay door that I already cut out. I cut out only half of the area between the formers with the idea of the radio being on the part I didn't cut out. I read once where someone took that oval ply panel that you remove from the fuselage bottom and turn it into a hatch cover and attach the radio to it. Makes it an easy to access radio installation and I was headed in this direction. It appears that the available area between the formers is 13". WoW! Wonder what the payload on this guy could be?? I like the idea of a BIG bay so it kind of looks like I could mount the servo tray and the radio up on a high shelf so to speak. The fuse here is 6" tall so if I dedicated the bottom three inches to bay area.....that yields 108 in3 of bomb space to work with!! I look forward to dropping those maple tree helicopter seeds.

I can see where the bellcranks would be handy for both a direction change and a ratio change. What I can't quite see yet is going from one servo to two doors and two arms per door, keep thinkin' - I guess I could have two servos, one to open the doors and one for a bomb release. Sequential operation...that would be nice. Can a radio make a standard (non retract)servo open and close as if it's operated by a rocker switch or only in a proportional type of way?

The radio is an open question. I am willing to spend the money to get a decent one and it's already got to be at least 6 channels. The only possible constraint is to go with JR because my other radio is the low end JR Quattro and can work as a buddy box and my father, who is learning this hobby with me is on JR.

Thanks for the diagram.

Greg