Dimpled or countersunk-Forward bottom skin

jimbo · #1 10-25-2009, 11:33 AM

On the RV9 fuselage does the forward F972 bottom skin that rivets to the center spar section carrythru get dimpled or countersunk? The F972 skin is 0.040" and I think the flange on the center spar section is that thickness also. I haven't found where it is called out either way. My thought is it is better to countersink the skin then the center spar section flange. I see there are 4 rivet holes called out that are to be countersunk on the seat/baggage area bottom skin so these 4 places must be dimpled on the corresponding F972 skin.

Just wanting to make sure I am not missing anything here.

Jim
RV9a fuse

scard · #2 10-25-2009, 11:53 AM

I'm pretty sure it is in the instructions. Read carefully. Machine countersink.

mcencula · #3 10-25-2009, 07:55 PM

http://www.vansaircraft.com/pdf/7_9_fuselage.pdf

jimbo · #4 10-27-2009, 11:36 AM

I was wondering what the source was of the explanation memo (http://www.vansaircraft.com/pdf/7_9_fuselage.pdf) posted on Mike Cencula's post. The memo makes it cut and dry-unlike Vans plans. Says not to countersink the F972 forward bottom skin.

Jim

jimbo · #5 10-27-2009, 11:42 AM

Duh.....Coming from Vansaircraft.com it must have been written by Vans themselves. I hadn't seen this before. Thanks Mike for this info.

Jim