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Cockpit controlled trim for Firestar-2 - Request Inputs

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aslsa.rng(at)gmail.com
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Posted: Wed Aug 19, 2009 5:48 pm Post subject: Cockpit controlled trim for Firestar-2 - Request Inputs

Mahesh, The cockpit adjustable elevator trim tab on a Mini Max I once owned was a pretty simple lash up of a piece of hinge, a cable and an RC bellcrank. Seemed to work okay.One caveat, the trailing edge of the Kolb elevator is made of 5/16" aluminum tubing and there isn't a lot to attach to, or much to control  any torque said trim tab would put upon it. You could change that, too, but now you're into uncovering, adding weight, recovering, adding weight, repainting, adding weight.........

 Not an expert, but why not go with a KISS system like Larry's fixed tab or a bungee system and see if that doesn't get the job done well enough.

Rick Girard



 On Wed, Aug 19, 2009 at 4:01 PM, Dana Hague <d-m-hague(at)comcast.net (d-m-hague(at)comcast.net)> wrote:

[quote] --> Kolb-List message posted by: Dana Hague <d-m-hague(at)comcast.net (d-m-hague(at)comcast.net)>

 

 At 01:02 PM 8/19/2009, Mahesh Iyer wrote:

  	  Quote: 	
		   I wanted some expert advice on building a cockpit controlled trim for my Firestar-2.

 

 Can any of you guide me with some good designs that I could use as a starting point to build? After flying the Cessna’s for quite some time, I am pampered by the use of the trim wheel and want to build something close to it for my Firestar-2.

  	
 



 I built a simple bungee trim for my UltraStar.

 

 <http://smg.photobucket.com/albums/v486/flyparafan/Kolb/?action=view&current=elevator_trim.jpg>

  

 I have aluminum trim tabs on the elevators, set to a slow cruise (about 40 mph) on the theory that I might survive a landing at that speed if the elevator linkage broke.  The bungee adds nose down trim, giving me just enough for a shallow dive when the front tanks are nearly empty.  What you see in the picture is a loop of bungee cord (the black and white striped lines), which attach to the elevator bellcrank at the rear and a piece of cord at the front (the red sleeve covers the knots).  The cord goes around a pulley attached to the fuselage frame with a cushioned tube clamp, thence to a jam cleat (also attached with cushioned clamps) where I set it as required.  Pull back on the line for nose down.  Of course a Firestar is different but the idea would be the same.

  

 The bungee, pulley, cleat, and red ball on the end of the line are all from West Marine.

 

 -Dana

 --

  If cars had followed the same developmental path as computers, a Rolls Royce would cost $100, get a million miles per gallon and explode once a year, killing everyone inside.



 

 

 

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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Thu Aug 20, 2009 5:39 am Post subject: Re: Cockpit controlled trim for Firestar-2 - Request Input

This one worked pretty good. May work again after I rebuild the airplane...



http://www.bcchapel.org/pages/0003/FSII%20Hot%20Box.html



Richard Pike

MKIII N420P (420ldPoops)

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