Blister on cowl for mixture arm

[Hornet2008]

I emailed Vans re the mixture arm contacting the port side of the air scoop on the cowl. They replied to get a straight mixture arm. I made up a dummy straight arm and tried it an looks like it will contact the FAB more than the offset one. I have already cut the cowl for the blister. Question Do I put a blister on the other side to match? Any photos or links would be greatly appreciated.

[Dan B]

I had to make a blister on my cowling. It is really not that noticeable.

[rightrudder]

Hi Pete,

I'd just do the one side. It's down low on the cowl, so as Dan says, it'll be hard to notice.

Check out my RV build thread elsewhere (RV-9A SoCal). On pages 19 & 20 there are pics and descriptions of the blister and airbox mods.

[Hornet2008]

Thanks Dan & Doug

[bugsy63]

G'day Pete,

I had the same experience as the other posters with my mixture arm. I re-made the FAB attachment plate to move the whole affair over my about 50mm then canted the inlet to align with the snout.

I also had to make the Vans modification to th FAB.

I've got an unused straight mixture arm here to try but I found it didn't avoid the blister. It's certainly not obstrusive in my opinion.

Contact me at mickbrooks2@optusnet.com.au if you want to have chat. I may have some left over bits that you need too.

[flynwest]

I too had to make a bump out on the cowl. Shhhhh don't tell my wife but I went to the kitchen and got one of the big serving spoons. I then used it for a mold to make a nice little blister then glassed it to the hole I had cut for the mixture arm. Looks good and I'm sure it is worth the 10 knots all RV mods get.