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Manual Trim

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Greg McFarlane

Joined: 12 Apr 2012
Posts: 57
Location: Albany Western Australia

Posted: Fri Apr 13, 2012 2:36 am Post subject: Manual Trim

Has anyone considered or fitted manual trim in an RV10 to eliminate any runaway trim issues, give infinite fine trim capability & just reduce electric complexity.

Lew Gallagher

Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC

Posted: Fri Apr 13, 2012 4:01 am Post subject: Manual Trim

Hey Greg,



I  just ran across the manual elevator trim option last week while I'm on 

this detour helping guys build RV-8's.  I was amazed at how simple it was. 

I asked if anyone had tried it on the RV-10.  He didn't know, but our guess 

is that the -8 uses only one tab and it's a small one vs. the -10's  two 

tabs.  I  never have liked the idea of funky cams and twisted tail effect on 

the -10, but with the correct alignment it works OK.  If you'd like, I can 

track down the hardware for the manual -8  ... perhaps there is an adaptor 

to  split the cable for the two tabs, or you could be the 

inventor/experimenter.



Later, - Lew



--

_________________
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
Fly off completed !

Greg McFarlane

Joined: 12 Apr 2012
Posts: 57
Location: Albany Western Australia

Posted: Fri Apr 13, 2012 4:32 am Post subject: Re: Manual Trim

Thanks Lew, I was thinking more along the lines of keeping the "funky" cam and just replacing the servo with a "normal" Vans manual type cable set up.

psychobob96(at)gmail.com
Guest

Posted: Fri Apr 13, 2012 4:36 am Post subject: Manual Trim

I've considered several methods of manual trim, however since I haven't started building yet it's all theoreticall.  I'll be interested to hear there ideas. 

Jason

 Do not archive On Apr 13, 2012 3:17 PM, "Greg McFarlane" <grbcmcfarlane(at)gmail.com (grbcmcfarlane(at)gmail.com)> wrote:[quote] --> RV10-List message posted by: "Greg McFarlane" <grbcmcfarlane(at)gmail.com (grbcmcfarlane(at)gmail.com)>

 

 Has anyone considered or fitted manual trim in an RV10 to eliminate any runaway trim issues, give infinite fine trim capability & just reduce electric complexity. [Rolling Eyes]

 

 

 

 

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rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Fri Apr 13, 2012 4:53 am Post subject: Re: Manual Trim

I installed a pitch trim enable push button next to my panel mounted rocker. No relays, trim speed controllers and definitely no runaways. KISS. One would have severe cramping in your arm if you had to fly very far. Yes it is sensitive at cruise...just don't tap the rocker long. Once trimmed close at cruise my AP takes care of it and will let me know if I need to retrim. I love the setup, cost and will even more when it breaks.

_________________
Wayne G.

johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Fri Apr 13, 2012 4:58 am Post subject: Re: Manual Trim

Here is a source if you are looking for one...

http://www.periheliondesign.com/moreproducts.htm

_________________
#40572 Phase One complete in 2011

rene(at)felker.com
Guest

Posted: Fri Apr 13, 2012 5:03 am Post subject: Manual Trim

I just install my auto trim this annual. Works great, wish I had done it in

the beginning.  Thos trutrak guys are great.



If you go manual trim, you lose that option.



YMMV



Rene' Felker

N423CF

801-721-6080

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dlm34077(at)q.com
Guest

Posted: Fri Apr 13, 2012 5:38 am Post subject: Manual Trim

If you are referring to pitch trim; my auto trim works in auto when the AP is in actively drving the aircraft. During manual control of the aircraft the trim switch works. I also fashioned a plug so that it reconnects the completely manual system if the auto pitch trim must be removed for maintenance; the aircraft is still operational.  

   

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sean(at)stephensville.com
Guest

Posted: Fri Apr 13, 2012 5:58 am Post subject: Manual Trim

Just a note that TT send out the plug mentioned below with the AutoTrim 

now, so there's no need to make one yourself.  One was supplied with my 

AutoTrim purchase.



-Sean #40303 (Fitting Doors)



On 4/13/12 8:37 AM, DLM wrote:

[quote]

 If you are referring to pitch trim; my auto trim works in auto when 

 the AP is in actively drving the aircraft. During manual control of 

 the aircraft the trim switch works. I also fashioned a plug so that it 

 reconnects the completely manual system if the auto pitch trim must be 

 removed for maintenance; the aircraft is still operational.



 --

Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Fri Apr 13, 2012 11:54 am Post subject: Re: Manual Trim

If you have a Trio autopilot with auto trim, not only does it trim when you use the autopilot; you can also use the trim function when hand-flying the aircraft. And, it is programable to run fast at low airspeeds, slow at high airspeeds. I use it all the time in cruise when hand-flying, for fine adjustments to the trim.



Also, it is a workaround against a stuck trim "hat" switch. (pull trim CB, you can still trim thru the autopilot). Negative side, if the trim runs away, you need to pull both the trim and the autopilot CB's and then trouble-shoot where the problem is. For this reason I have those breakers side by side, directly in front of me.



Of course it is still electrical; if the motors, wires to the motors, or battery fails, there's no trim.

_________________
Bob Turner
RV-10 QB

Mauledriver(at)nc.rr.com
Guest

Posted: Fri Apr 13, 2012 1:55 pm Post subject: Manual Trim

I've found the easiest way to trim for any climb, descent or for level 

flight is to simply engage the TT AP.  If I want to hand fly at that 

point (??), I just disconnect the TT and there we are.



With that said, trimming "manually" with the trim button could hardly be 

easier.



Bill



On 4/13/2012 9:02 AM, Rene Felker wrote:

 	  Quote: 	
		   



 I just install my auto trim this annual. Works great, wish I had done it in

 the beginning.  Thos trutrak guys are great.



 If you go manual trim, you lose that option.

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