Skymaster Forum  

Go Back   Skymaster Forum > Messages
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
Thread Tools Rate Thread Display Modes
  #1  
Unread 09-03-17, 06:24 PM
JimC's Avatar
JimC JimC is offline
Registered User
 
Join Date: Aug 2012
Location: United States
Posts: 301
JimC is on a distinguished road
Horton/Robertson differences

Are there any differences between these two that can be indentified from photos or an exterior inspection without dropping the flaps?
Reply With Quote
  #2  
Unread 09-04-17, 10:44 AM
hharney's Avatar
hharney hharney is offline
Forum Administrator
 
Join Date: Jul 2002
Location: Michigan (8D4)
Posts: 2,253
hharney is on a distinguished road
Maybe if they were side by side. Not sure????
__________________
Herb R Harney
1968 337C

Flying the same Skymaster for 47 years
Reply With Quote
  #3  
Unread 09-06-17, 11:09 PM
general's Avatar
general general is offline
Registered User
 
Join Date: Nov 2003
Location: Belize City, Belize, Kiowa, KS, Breckenridge, CO
Posts: 61
general is an unknown quantity at this point
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
__________________
General Sky
Tree top Flying in C336, O2, 337A, P337G with IO-550's
Reply With Quote
  #4  
Unread 09-07-17, 07:19 AM
JimC's Avatar
JimC JimC is offline
Registered User
 
Join Date: Aug 2012
Location: United States
Posts: 301
JimC is on a distinguished road
I've seen Horton with stall fences, and I've seen Robertsons with aft cowling VGs.
Reply With Quote
  #5  
Unread 09-10-17, 05:59 PM
rrolland rrolland is offline
Registered User
 
Join Date: Apr 2016
Location: Miami FL
Posts: 93
rrolland is on a distinguished road
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.
Reply With Quote
  #6  
Unread 09-10-17, 07:53 PM
JimC's Avatar
JimC JimC is offline
Registered User
 
Join Date: Aug 2012
Location: United States
Posts: 301
JimC is on a distinguished road
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.
Reply With Quote
  #7  
Unread 09-12-17, 03:14 PM
hharney's Avatar
hharney hharney is offline
Forum Administrator
 
Join Date: Jul 2002
Location: Michigan (8D4)
Posts: 2,253
hharney is on a distinguished road
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
__________________
Herb R Harney
1968 337C

Flying the same Skymaster for 47 years
Reply With Quote
  #8  
Unread 09-12-17, 07:26 PM
JimC's Avatar
JimC JimC is offline
Registered User
 
Join Date: Aug 2012
Location: United States
Posts: 301
JimC is on a distinguished road
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.
Reply With Quote
  #9  
Unread 09-14-17, 09:16 PM
AP AVM AP AVM is offline
Registered User
 
Join Date: Feb 2016
Location: Waterloo,ON
Posts: 82
AP AVM is on a distinguished road
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.
Attached Thumbnails
Click image for larger version

Name:	FB_IMG_1503849302538.jpg
Views:	1177
Size:	79.7 KB
ID:	1775  
Reply With Quote
  #10  
Unread 09-16-17, 09:43 PM
JimC's Avatar
JimC JimC is offline
Registered User
 
Join Date: Aug 2012
Location: United States
Posts: 301
JimC is on a distinguished road
The winglets are not part of the Horton STOL STC.
Reply With Quote
  #11  
Unread 09-17-17, 03:48 PM
JimC's Avatar
JimC JimC is offline
Registered User
 
Join Date: Aug 2012
Location: United States
Posts: 301
JimC is on a distinguished road
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?
Reply With Quote
  #12  
Unread 09-17-17, 08:37 PM
hharney's Avatar
hharney hharney is offline
Forum Administrator
 
Join Date: Jul 2002
Location: Michigan (8D4)
Posts: 2,253
hharney is on a distinguished road
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.
__________________
Herb R Harney
1968 337C

Flying the same Skymaster for 47 years
Reply With Quote
  #13  
Unread 09-18-17, 07:54 AM
JimC's Avatar
JimC JimC is offline
Registered User
 
Join Date: Aug 2012
Location: United States
Posts: 301
JimC is on a distinguished road
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.
Reply With Quote
  #14  
Unread 09-20-17, 04:46 PM
MelsML55 MelsML55 is offline
Registered User
 
Join Date: May 2015
Location: T67
Posts: 27
MelsML55 is on a distinguished road
Mine has the cuff on the leading edge and a small spoiler(air gate) at each end of the wing.
Attached Thumbnails
Click image for larger version

Name:	Screen shot 2017-09-20 at 3.37.26 PM.png
Views:	1232
Size:	583.9 KB
ID:	1776  
Reply With Quote
  #15  
Unread 09-20-17, 09:22 PM
hharney's Avatar
hharney hharney is offline
Forum Administrator
 
Join Date: Jul 2002
Location: Michigan (8D4)
Posts: 2,253
hharney is on a distinguished road
Quote:
Originally Posted by MelsML55 View Post
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
__________________
Herb R Harney
1968 337C

Flying the same Skymaster for 47 years
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 12:51 PM.


Powered by vBulletin® Version 3.6.9
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.