Horton/Robertson differences

[JimC]

Are there any differences between these two that can be indentified from photos or an exterior inspection without dropping the flaps?

[hharney]

Maybe if they were side by side. Not sure????

[general]

I've had both my Robertson had a fence on top of the wing going from the front to the back just outside the flaps. My Horton did not have the fence on top of the wing, but the Hortons also have Vortec generators that fit on rear engine cowling just below the engine. The Horton has other differences on the Leading Edge of the vertical tail Boom

[JimC]

I've seen Horton with stall fences, and I've seen Robertsons with aft cowling VGs.

[rrolland]

The Horton has the drooped leading edge extension as well as the fences just outboard of the flaps.

Some aircraft -such as mine- also have the Robertson VG's under the rear engine cowling.

Hope this helps.

[JimC]

I think the problem in finding differences is that Horton basically copied Robertson. Both have a leading edge cuff, stall fences outboard of the flaps and large rear cowling VGs.

[AP AVM]

Here is a picture of a 77 337G Skymaster II with complete Horton kit installed on it. Wing tips droop plus have formed winglets on them.

[JimC]

The winglets are not part of the Horton STOL STC.

[JimC]

I think I found a partial difference:

All Robertson kits came with tail boom fairings. Some Horton kits had tailboom fairings, and you can purchase tailboom fairings without either STOL kit.

So from logic 101:
If it doesn't have tailboom fairings; it doesn't have a Robertson kit.

Can anyone find an example where this is false?

[hharney]

If it has a Robertson the seller would be smart enough to brag about that system as it is worth much more money. If it just says STOL kit it's probably a Horton. I have never seen a STOL kit without the boom fairings. Not saying they aren't out there I just think that's a poor identifying component. Why would you rely on the ad without calling and talking to someone that represents the plane? Anyone that knows anything should be able to verify the system by extending the flaps and see if the ailerons are inter-connected.

[JimC]

Well, one I was looking at was being sold by "a friend" - that's not too uncommon. They didn't know which STOL it had. I know of at least one plane currently listed online by an aircraft dealer that says "STOL kit installed" - and I'm sure it's a Robertson.

I did find one more way to check: Robertson has a remarked ASI with a slower white arc; Horton does not.

[MelsML55]

Mine has the cuff on the leading edge and a small spoiler(air gate) at each end of the wing.

[hharney]

Originally Posted by MelsML55

Mine has the cuff on the leading edge and a small spoiler(air gate) at each end of the wing.

You also have FENCES on the top of the wing (one on each wing) and VORTEX GENERATORS on the rear fuselage and BOOM FAIRINGS on the connection of the boom and the vertical stab

The spoilers you refer to on the end of the wing are droop wing tips. Which yours are pretty much Cessna Stock tips not the radical droop that Horton offers as an option

[kilr4d]

Originally Posted by MelsML55

Mine has the cuff on the leading edge and a small spoiler(air gate) at each end of the wing.

Nice paint Mel.

Start a thread, tell us about your bird.

[JimC]

Originally Posted by MelsML55

Mine has the cuff on the leading edge and a small spoiler(air gate) at each end of the wing.

Is yours a Horton?