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Old 05-19-2021, 10:41 AM
Snowflake's Avatar
Snowflake Snowflake is offline
Join Date: Oct 2009
Location: Sidney, BC, Canada
Posts: 4,185
Default [Wanted] Gretz Elevator Trim Info

Gretz used to sell a kit to mount your electric elevator trim servo in the space where the VS and HS meet in the fuselage, and use a short cable out to the tab. That kit is no longer available, but i'm wondering if anyone has any photos of such an install, or a copy of the Gretz paperwork that came with such an install. Specifically hoping to identify servo and cable part numbers.

I was sure i'd seen a discussion recently on this that had photos but a search has not been successful in finding it... Any help appreciated!
Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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Old 05-19-2021, 11:24 AM
Kyle Boatright Kyle Boatright is offline
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,546

Rob, I have that setup. Basically you have the standard Ray Allen trim servo mounted on the aft fuselage deck. It actuates the trim tab using a cable routed through one of the lightening holes on the HS, then through a hole in the center of the HS and Elevator spar webs. The cable exits the underside of the elevator and ties to the trim tab with a standard clevis. If you want pictures, I can make/post some.

The thing I donít know is the cable length. It looks like one of the green ones youíd custom source through Vanís or Aircraft Spruce. It has a threaded connection on each end.
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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Old 05-19-2021, 11:40 AM
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Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,956

Sounds similar to the setup in the RV 10.

You might get some ideas or parts from the 10 plans.
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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Old 05-19-2021, 11:47 AM
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Isaac Isaac is online now
Join Date: Nov 2009
Location: Peoria, Az
Posts: 159
Default RE:Gretz Trim Mod

The attached doc is what I got a long time back on the Gretz elect trim servo install. Don't know what happened to the first page. I was able to get a used kit that included the cable and a few pieces of the kit from another builder and fab the rest myself so I don't know the actual length of the cable. Take note of where the trim servo is mounted on the deck. It is offset to the side where the cable exits into the horizontal stab to give the cable a more straight line path to the trim tab.
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RV6 N947J
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Old 05-19-2021, 11:58 AM
Stevea Stevea is offline
Join Date: Jun 2008
Location: San Jose, CA
Posts: 122
Default Gretz elevator trim system


Well, I'm almost no help. Went through all my build photos and could not find any close up ones of the Gretz trim setup on my 6A. Also can't find any install info in my build maybe it didn't come with any? Pretty sure I would not have thrown it away.

I can tell you the Gretz kit used a Ray Allen T3-12A servo. Don't remember the cable having any part number stamped on it.

If you like, I'd be willing to pull the empenage fairing off and take some close up photos of my setup. Let me know if that would help.
Steve Allison
RV-6A - sloooowwww build
First flight - 3/8/14
Phase II - 5/19/14
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Old 05-19-2021, 05:21 PM
J Crate J Crate is offline
Join Date: Oct 2006
Location: Orillia, Ontario Canada
Posts: 47

Rob, I have the cable (never used). It is 5í end to end. If interested, pay for shipping and make what you think is a fair donation to Doug.
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Old 05-19-2021, 08:20 PM
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Fred.Stucklen Fred.Stucklen is offline
Join Date: Oct 2006
Location: Brooksville, FL
Posts: 416

I'm the original designer of this trim configuration. I gave it to Warren Grett to sell.

Here's a picture of the MAC Servo installation:

I'm looking for the cable spec...
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Fred Stucklen
RV-7A N924RV Flying (1888 Hrs & counting)
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)

First 2021 Contribution done
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