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Offline Motorman

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« on: November 23, 2017, 10:27:23 AM »
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« Last Edit: March 08, 2022, 09:27:58 PM by Motorman »
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Offline John Rist

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Re: Tom Morris Control Systems
« Reply #1 on: November 24, 2017, 08:05:09 AM »
I am not sure how to answer the question.  However I have a Tom Morris built and setup E Cavalier.  It appears to have around a 560 sq in wing.  The flap horn is about 1.25" long and the elevator horn is around .850 long.  If you contact Tom and tell him what you are building he will build a custom fit control system that has all of the control rods, control horns, and bellcrank sized to fit.  He built the control system for my Sakitumi-E.  It was spot on ready to drop in.  Can't go wrong with a Tom Morris built set of controls.
John Rist
AMA 56277

Offline Motorman

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Re: Tom Morris Control Systems
« Reply #2 on: November 24, 2017, 04:35:54 PM »
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« Last Edit: March 08, 2022, 09:28:35 PM by Motorman »
Wasted words ain't never been heard. Alman Brothers

Offline Motorman

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Re: Tom Morris Control Systems
« Reply #3 on: November 27, 2017, 11:15:01 AM »
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« Last Edit: March 08, 2022, 09:28:50 PM by Motorman »
Wasted words ain't never been heard. Alman Brothers

Online Howard Rush

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Re: Tom Morris Control Systems
« Reply #4 on: November 27, 2017, 01:42:26 PM »
Thought this thread would get more traction.

You can get the control geometry you want with most any size control horns. Which size to use is determined by weight, structure, and control wiggliness. We can probably get away with shorter control horns than in bygone days, because now we have stiff carbon pushrods and no-slop ball links. The shorter the control horns, though, the more friction in the bushings.

3/32” wire is plenty for an elevator control horn. Elevators don’t have much hinge moment.

The main issue I’ve had with stunt control horns is bent wire. You can get straight ones by making your own using Derek Moran’s process. Search for it on the SSW forum. 
The Jive Combat Team
Making combat and stunt great again

Offline jose modesto

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Re: Tom Morris Control Systems
« Reply #5 on: November 27, 2017, 03:43:05 PM »
Motorman.
The two systems you listed are used in 700 si planes
The system you call small is what Randy Smith shows for his SV series of planes

The large system is what Paul Walker plunlished in the Impact article  FM mag 1991

The small system came in second at this years nats. Derek Barry 65 oz close to 700 squares

The large system is slower. Needs more bellcranck movement to get deflection. Works great on rear CG models
The smaller is faster ( assume same  bellcranck )
My take is that the smaller system works better with electric as the CG is further forward and controls are a little faster
Jose Modesto


Offline Motorman

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Re: Tom Morris Control Systems
« Reply #6 on: November 28, 2017, 02:43:34 PM »
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« Last Edit: March 08, 2022, 09:27:16 PM by Motorman »
Wasted words ain't never been heard. Alman Brothers

Online Howard Rush

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Re: Tom Morris Control Systems
« Reply #7 on: November 28, 2017, 05:13:52 PM »
I'll have to draw it out on paper.

Use 3D paper.

This reminds me of something Gary Letsinger said: the main product of analysis is insight, not answers.
The Jive Combat Team
Making combat and stunt great again

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