Originally posted by MrSteve09
CurtD,...
I am curious to know where you got the fiberglass cowl for the Dirty Birdy 60 that you are building?? Typically "wood" Dirty Birdy's had wood cowls, EXCEPT for the Dirty Birdy 40 kits which came with glass cowls.
Yes,... my Dirty Birdy is a bit confusing since it has a diferent shape rudder, NO sub fin, as the depth of the fuselage was increased to include the open pipe tunnel.
And yes,... to the best of my knowledge the anhedral stab was a UFO and XLT feature only.
In any case here is what the 91 Surpass looks like mounted inverted in my Dirty Birdy.
Signed,
Steve T.
Actually the original wooden DB had NO cowl. Like most airplanes of that era it used wooden beam mounts with the engine sitting in a hole just big enough to shoehorn it in.
The fiberglass cowling is my own. I made a split mold and can pull a cowl with about 30 min. work. The cowl makes working on the engine a breeze. I side-mount my .91 Surpass and run a 12-11N APC prop which seems just about right.
Your DB appears modified considerably from Joe's original design. The vertical fin and rudder are very different and the lack of subfin makes it look like another design. I would expect that without the subfin there would be considerable roll coupling in knife edge?? I also notice the wingtips are squared off. The original has a sharp edge around the entire wingtip and the same on the stab. Look closely at the tips in my pics. Joe B. says that the wing needs those sharp tips but I've never asked him why.
Sorry, but your DB wouldn't be legal for SPA!!
