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Elevator trim servo

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ashontz

Joined: 27 Dec 2006
Posts: 723

Posted: Thu Feb 08, 2007 6:22 am Post subject: Elevator trim servo

I'm thinking of using something other than an expenive Ray Allen unit. Any suggestions? Is there a specific weight limit for how heavy the trim servo can be? Obviously I want to install something that's light as possible and yet still up to the task.



Thanks

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larry(at)macsmachine.com
Guest

Posted: Thu Feb 08, 2007 7:27 am Post subject: Elevator trim servo

Mr Ashontz,

I'd recommend you reconsider Ray Allen Mac Trim Systems as they have 

product for trim switches, stick grips with switches, rocker

switches and position indicators that are designed to work with each 

other.  Expensive or not, it's easier than doing a

servo that will either not fit the space needed or work with the other 

components or have the force function or operating voltage

or distance throw that you need.  I'd recommend you go with a company 

that has worked all that out ahead of time. 

It's more than one component and if you decide to do the R&D, you should 

plan on adding another year or more working on your plane.



Larry McFarland - 601HDS at www.macsmachine.com

ashontz wrote:

 	  Quote: 	
		   



 I'm thinking of using something other than an expenive Ray Allen unit. Any suggestions? Is there a specific weight limit for how heavy the trim servo can be? Obviously I want to install something that's light as possible and yet still up to the task.



 Thanks



 --------

 CH601XL - Corvair





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=93633#93633

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ashontz

Joined: 27 Dec 2006
Posts: 723

Posted: Thu Feb 08, 2007 7:59 am Post subject: Re: Elevator trim servo

 	  larry(at)macsmachine.com wrote: 	
		  Mr Ashontz,

I'd recommend you reconsider Ray Allen Mac Trim Systems as they have 

product for trim switches, stick grips with switches, rocker

switches and position indicators that are designed to work with each 

other.  Expensive or not, it's easier than doing a

servo that will either not fit the space needed or work with the other 

components or have the force function or operating voltage

or distance throw that you need.  I'd recommend you go with a company 

that has worked all that out ahead of time. 

It's more than one component and if you decide to do the R&D, you should 

plan on adding another year or more working on your plane.



Larry McFarland - 601HDS at www.macsmachine.com

ashontz wrote:

 	  Quote: 	
		   



 I'm thinking of using something other than an expenive Ray Allen unit. Any suggestions? Is there a specific weight limit for how heavy the trim servo can be? Obviously I want to install something that's light as possible and yet still up to the task.



 Thanks



 --------

 CH601XL - Corvair





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=93633#93633



   



	
	




Thanks. However, I like making stuff and have an idea using a little motor assembly like this (http://www.hobbyengineering.com/H1646.html). If I'm not mistaken, 46 in-oz of torque is 4lbs applied at one inch, that's actually a lot or torque, enough to easily drive a 1/4 bolt through a all-thread connector sliding through a square hole and attached to the elevator trim bellcrank. At 20 threads per inch, at 62rpm and about 1/2" deflection needed that would translate to about 9 seconds to travel the full range of deflection.



Working in mm a 1/4inch bolt is 6.35mm in diameter which gives a circumference of 19.9, roughly 20:1, so the fulcrum action of the thread would be a multiplier of 20 or 46oz times 20, or almost 80pounds.



This unit is nice in that it's got all the multiplicative torque needed and as metal gears, and weighs hardly anything, and only costs $23 to boot. Making an aluminum housing for this badboy would be a piece of cake. I just may have to give it a try at that price.



Unless my math is off, this seems like it fits well within the parameters of the Ray Allen component at a tenth the price.

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ashontz

Joined: 27 Dec 2006
Posts: 723

Posted: Thu Feb 08, 2007 8:33 am Post subject: Re: Elevator trim servo

http://www.aircraftspruce.ca/catalog/elpages/ractrimservos.php



SERVOS ONLY 

RAC Servo Sys. Part No. Output Shaft Movement Travel Time Price Buy 

T2-7A 11-02048 0.7 in. 10 sec. $127.95 ($157.38CAN)   

T2-10A 11-02058 1.0 in. 16 sec. $127.95 ($157.38CAN)   

T3-12A 11-02065 1.2 in. 19 sec. $149.95 ($184.44CAN)   

T4-5 11-02066 0.5 in. 15 sec. $193.95 ($238.56CAN)   



I wouldn't be surprised if ray allen is using a very similar looking arrangement internally as what I'm describing. I guess $127 for just the servo itself isn't too bad. I may still try it though. Ray Allen's motor is probably a 5v motor with a voltage divider in it. The travel and time is nearly exactly the same though as well as the output force.

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admin(at)arachnidrobotics
Guest

Posted: Thu Feb 08, 2007 9:40 am Post subject: Elevator trim servo

[quote][b]

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naumuk(at)alltel.net
Guest

Posted: Thu Feb 08, 2007 3:33 pm Post subject: Elevator trim servo

I thought the same thing when I did my aileron trim. Jeff Small did a 

nice installation using an automotive component, but I couldn't find a used 

one anywhere. An OEM replacemnt cost more than the Ray Allen.

    I still got my Ray Allen for nothing. I asked for one for Christmas!

                                    do not archive

Bill Naumuk

HDS Fuselage

Townville, Pa

---

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