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#3
09-06-17, 11:09 PM
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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
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General Sky Tree top Flying in C336, O2, 337A, P337G with IO-550's 
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#5
09-10-17, 05:59 PM
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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.
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#7
09-12-17, 03:14 PM
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Jim
The difference is the Robertson has the ailerons interconnected with the flaps. As the flaps are extended the ailerons also extend providing flaps across the full wing span. This does make the roll very stiff but amazing performance. It would cost in excess of $10K to do a Robertson today (now owned by Sierra) where the Horton and Stein kits are less than half of that price All Horton kits had the VG's on the rear cowl, along with leading edge cuff, boom fairings and stall fence on upper surface of the wing. There are a couple different wing tip options. Stock Cessna tips or the 80 degree droop tip Horton never made ANY claims to enhanced performance as it would have cost much more for the STC. The Horton just piggy backed Robertson's following
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Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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#8
09-12-17, 07:26 PM
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Yes, I knew the part about the drooping ailerons. Here's the problem I'm trying to solve:
I look at a picture of a 337 for sale on the internet. I see the cuff & fences. The ad says "STOL kit." Before I waste more time, which one is it? Last edited by JimC : 11-03-21 at 04:24 PM.
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#11
09-17-17, 03:48 PM
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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?
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#12
09-17-17, 08:37 PM
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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.
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Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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#13
09-18-17, 07:54 AM
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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.
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#15
09-20-17, 09:22 PM
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Quote:
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
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Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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