Flap Droop Horton STOL kit
 

Does the Horton STOL kit add any flap droop? Or are the flaps mechanically set IAW the service manual?

Same question for the Robertson kit.

Thanks

No flap droop on my aircraft which has the Horton STOL kit. No change to the rigging.

Richard

Robertson vs Horton
 

I do not know much about the Horton.
I believe it is just the leading edge mod?

I have a Robertson STOL T337D

Am pretty sure these are the RSTOL specs

Gross weight 4700

I believe regular gross 4200?
Does that mean 5000lb payload increase?

Leading edge mod

Wingtip fairings

Various other fairings cleanup booms / rudders

Stall fences atop wing inboard of airlierons (standard?)

1/3 flap - all flaps come out and back together
2/3 flap - more
3/3 flap - more, but ailerons actually go back up a bit

vortex generators cleanup bottom / rear drag
450 fpm single engine climb at max gross
(turbo up to 16,500 MSL)

I know the 'published' numbersd are
takeoff ground roll 395 ft
landing roll 360 ft

Of course that is on hairy edge of stall with
at or near full power
and everything screaming 'dont do this!'


I have screwed around a bit down near there. Weird.

Departing Annapolis solo one cool morning,
I know I was off the ground before the crossover,
maybe what, 400 ft from end of runway? Maybe less?

In transition training years ago, played with it at Martin State.
My (mil) instructor said, "Let's see what it can do."

Again, we were stopped before the first high speed exit ramp.
Again, less than 500 ft from touchdown.
The controllers were whistling at us.

On a BFR w instructor we were doing 45-60 banks at 55mph
when he said, "This is very strange, especially in a twin"

For what it is worth,
the gal that used to maintain my and a four other 'thrashers
noted to me in comparison w others,
mine flew notably more nose down (diff angle of incidence),
and was a 'screamer.'

One of the reasons I am reluctant to fly any other 337 is
the RSTOL perf is so ingrained in me, I'd get myself into trouble.

D

The Horton kit on my airplane (P337) has the drooped wing leading edge, a wing fence just inboard of the aileron and VG's on the bottom of the rear fuselage.

MTOW is 4700 Lbs.

Low speed performance is quite good although probably not as good as the Robertson.

Richard

Not sure what you are asking, Flap Droop? Are you referring to the ailerons acting as flaps?

Robertson stol
 

The Robertson stol kit has their flap aileron interconnect, as the flap angle increases the ailerons increase their deflection. This was patented by Robertson.
I find that it dose make the controls heavier. But the kit certainly gets the plane of the ground quick and reduces approach speeds. I have two 337 one with kit and one without (long story) . Jury still out on which I prefer.
I also have the Robertson manual.