I'm getting ready to mock up/mount my engine(thunder tiger.91 4 stroke) to its mounts and to the firewall. I noticed the building plans do incorporate in a degree and a half of "down thrust",but I dont see ANY "right thrust" designed in there anywhere. Do I not need it,or should I account for alittle right thrust when mounting my engine on the mount rails? I'm using an anti-vibration Dubro rubber mounted mount. Its an expensive mount and I want to make sure I've got everything right before I do drilling the holes in the rail. So whats the deal with it not having any right thrust?


Oh,and while I'm at it,I'll ask this too....I may have to reposition the firewall about 1/2-3/4" back further in the fuselage to be able to get the motor back far enough because of that bulky motor mount. Is there gonna be enough room in the fuel tank compartment to still fit the tank in to pull this off? Or are there any other problems I might run into doing this? I know alot of you guys have built this kit,and might be able to help me here. I'm using a 14oz Du-bro tank many of you have also installed. I just dont want the motor to stick out the front too far.

Jester,
Just use the supplied engine mount that comes with the kit. It's more than enough for the 4-stroke engine you're using. I've had 3 Sig Pigs, all with the OS 91 FX in them, and they all used the mount that comes in this kit.

Hope this helps

Ken

I built mine without right thrust and it does ok.
I have some rudder mixed with the throttle (its on a switch) that really helps with the take off roll.