EZFlap wrote:Look at the Bellanca 14 series. I THINK I remember an airfoiled stabilizer.

The 0009 and its ilk are fairly well accepted for tail surfaces. Very unlikely that you will have any problems, but you need to check with a real aero guy just to make sure.

mtv wrote:If you're proposing to do this to a certificated airplane, it would most definitely be considered a "major alteration" by the FAA. That would require either an STC or a field approval. I seriously doubt any FSDO would issue a field approval on something like this.

You could put the airplane in the "Experimental-Flight Test and Engineering" category for a time to experiment with this if you want. You'll have to apply to the FAA for a new airworthiness certificate, then another to go back to original configuration.

You might want to talk to Doug Keller in Oregon. Doug developed a set of slotted flaps for the experimental Cub market. He also experimented with an airfoil on the lower surface of the tail, but apparently concluded that wasn't necessary. His web site: http://www.performancestol.com/about_us.htm

I don't know how much he'll be able to share with you, but it'd be worth a call.


Thanks will make that call. I'd like to put together/generate dwg's, math, list of other aircraft so equipped for a one time stc or field approval.
Mark M.

MTV