Horton/Robertson differences

AP AVM · #1 09-14-17, 09:16 PM

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 · #2 09-16-17, 09:43 PM

The winglets are not part of the Horton STOL STC.

JimC · #3 09-17-17, 03:48 PM

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 · #4 09-17-17, 08:37 PM

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 · #5 09-18-17, 07:54 AM

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.