On Sun, 14 Sep 2003 10:59:15 GMT, Kevin Horton
wrote:

On Sun, 14 Sep 2003 02:19:01 -0700, Roland M wrote:

I heard of a tail drager Canada? USA? with an amazing 15mph stall anyone
know, kit/plans/manufactured, still in buisness? Thanks Roland

That sounds like the Pegazair. Their web site lists the VSO for the
Pegazair P-80 as 23 mph, with the minimum controllable speed as 15 mph,
whatever that means.

Even a VSO of 23 mph is hard to believe, with a weight of 1200 lb and a
wing area of 150 sq. ft. That implies a CL of 5.9 which doesn't seem
credible to me. 15 mph implies a CL of 13.9, although some of the weight
is probably being supported by power in this case, so the actual CL
required would be a bit less.

I suspect the quoted specs are IAS numbers, which are pretty much
meaningless given the usual position errors at high angle of attack. I
fly a C182 that will fly at less than 30 kt IAS, but I don't believe for a
minute that the airspeed is really anywhere close to 30 kt CAS.

See: http://www.tapanee.com/index.html

You'll have to click the little "English" button near the top left of the
page, as the company is based in Quebec, and most of their sales are in
Quebec.

It is interesting to compare the claimed performance against the CLs that
Chris Heintz quotes. He claims he gets a CL max of 3.3 with leading edge
slats plus flaps, which is in line with various wind tunnel studies I have
seen.

http://www.zenithair.com/stolch801/design/design.html

The claimed performance of the Zenair CH-801 implies a CL max of 3.3
(stall speed of 39 mph at 2,150 lb weight with 167 ft^2 of wing area).

http://www.zenithair.com/stolch801/performance.html

In a 20 knott headwind the Peg will hover under power at a fairly
steep angle. In a 30 knott wind it can be backed onto the runway. It
is similar to a scale Helio Courier. It has automatic leading edge
slats and full span flaperons. Gross weight is 1420 lbs.

I am building one.