RE: Extreme Flight 87" Yak 54 - Build & Fly
Neo,
It's like the challenger I built... you use front former as a template to cut a ring of ply.
The ring is temp mounted to the former and the cowl fitted and tacked.
The ring is then permanently epoxied to the cowl and reinforced.
Then the screws go in from the front of the cowl to reach back and screw the cowl ring to the front former.
It makes for a decent setup, though maybe a tad heavier and a few steps more work.
Here is a pic of the wooden cowl I made for the C3... The ring shown is the "cowl ring" and was screwed (or blindnutted to the F1 former).... This pic shows it before I trimmed the excess wood to the ring....
On an ARF, there will be some inset usually as the cowl fits back further than the F1 former... On the Yak we'4re talking maybe only 1/4"-1/2" inset.
J. David