Mounting cowling

Help Support Sonerai.net:

planda31

Member
Joined
Dec 28, 2019
Messages
19
Anyone give me some do's and don'ts on mounting the cowling? How far back from the face of the prop hub? Should there be a gap on the bottom at the front of the gear? (taildragger). I assume to center the front opening with the prop hub. Thanks in advance.
 

planda31

Member
Joined
Dec 28, 2019
Messages
19
Anyone give me some do's and don'ts on mounting the cowling? How far back from the face of the prop hub? Should there be a gap on the bottom at the front of the gear? (taildragger). I assume to center the front opening with the prop hub. Thanks in advance.
There have been enough of these made, seems like there could be a parallel dimension down from the top longeron to the hinge on the cowling. Also the forward dimension or the gap between the cowling and the prop flange.
 

Soneraifred

N99FK and me at OSH
Staff member
Administrator
Joined
Jan 12, 2006
Messages
926
Location
Franksville, WI
The cowling location relative to the front face of the prop hub is really a function of the width of the spinner rear bulkhead flange. If the flange is 3/4” wide, you’ll want the front of the cowling about 7/8” back from the prop hub face. When I installed my cowling, I made a plywood bulkhead with the correct spacing built in that I bolted the prop hub, and then screwed the front cowling flange to it.
The cowling horizontal split line should be on the crankshaft centerline and parallel to the top longeron. The bottom rear of the cowling should be below the bottom of the landing gear where it is attached to the bottom of the fuselage.
 
Top