moving the firewall back on a CG Ultimate..?
I agree.
Don't move the fire wall, move the cowl.
I am almost at the covering stage on mine. It will use the OS 120.
I will fit the cowl to the motor before I start to cover.
You might also look to see if you can move the motor back on the motor mount. The carb. on my OS clears the fire wall with only about 1/4 inch of space. Thats plenty of room. All else is cut to fit so that the end result looks good.
I am also building a second Ultimate 15% larger than the CG Ultimate. All I did was Xerox copy the rib pattern at 115% magnification and increased the span to be about 62 inches.
The cowl for this Ultimate will be the old Ohio RC Ultimate. I will modify the fuse of the airplane to fit the cowl. A little wider than plan, but it will look good when finished.
Once its done no one will know that you changed anything.
good luck
tonyc
tonyc