As I recall the little metal tag that FAA wants visible on the aircraft has
a space for the A/C MFR. That is where you put your name. You are the Mfr.
and therefore entitled to do the condition inspections and all modifications
consistant with your airworthiness cert. I didn't find any approval blank
for Canadian Home Rotors when I made modifications to my helicopter. They
did ask me not to call it a Safari if I was making un-approved mods.

Stuart Fields
Experimental Helo magazine
P. O. Box 1585
Inyokern, CA 93527
(760) 377-4478 ph
(760) 408-9747 publication cell
"Ernest Christley" wrote in message
...

I have just been informed by the designer of the aircraft that I am
building that there is a possibility that he may not allow me to use an
alternative engine. Granted that weight and balance, as well as power
requirements must reasonably lie within allowable ranges, what is the roll
of the kit or plans manufacturer in the final homebuilt aircraft? Will the
FAA award him the power to veto my airworthiness certificate?