Interesting thread, I am building a BlueJay Dirty Birdy and had to change a lot to the nose to get the motor to fit[:@] went from 2 1/4 to 2 3/4 inch spinner siize. Man I can not believe how wide this Irvin 72 is. Turned into a custom build all the way. Interesting plan's and instructions with this bird. . Now a lot of SANDING[:@]
Larry K