I have a sig 4 star 40 that a friend at work gave me. I had to do a little repair work on it, and now I am ready to mount my new OS .46 LA engine. The mount I bought seems a little too short to have the propeller clear the tip of the plane. I also do not know if I should center the engine, angle it, etc.....

My questions are:

1. Can I shave the tip of the plane so the mount I have will work (looks are not important).

2. Should I just mount the engine dead center and even on the firewall, or is there something special I should do?

3. What size fuel tank should I get?

Thanks for your time.
Sean Corder

Hi,
I am not familiar with the 4* so can't answer all of your questions.
On my GP Super Sportster I had to laminate some plywood together to make a spacer to go between the engine mount and firewall. This moved the engine forward enough to clear the front of the plane. This would probably be easier than modifying the plane. Don't forget to fuel proof it.
KW_Counter

Thanks, I will do that. How do I know how far vertically to mount the engine? I believe i can get it nearly correct, just buy eye balling the shape of the nose. (this is my first gas plane, I fly electric) Is there magic in the placement of the engine ?

Sean

I will look into plans tonight and let you know about the place of the thrust line.