Where is the Wigeon engine file?

I'm making a mod and I want to port the Lansdale engine to the Wigeon, but I can't seem to find the Wigeon engine file. Does anyone know where I can find it?

 

The engine files are in the common folder. this is so it can be shared between the pigeon and wigeon.

 

Yep, vehicles/common/pigeon to be exact.

 

Thanks for the help!