Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25781
Location: Livermore CA USA
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 Posted: Wed Oct 22, 2008 2:34 pm Post subject: TruTrak "Failsafe Automatic Pitch Trim"... |
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At 05:37 AM 10/22/2008 Wednesday, you wrote:
| Quote: | --> RV8-List message posted by: "Don McNamara" <N8RV(at)gte.net>
Also, Matt, what's that gizmo attached to your pitch servo? I have a TT system as well, but don't have that rectangular thing with a wire for my control arm ...
-- Don
N8RV |
The special linkage between the stepper motor and the pitch axis bellcrank is a strain gauge that provides feedback to another electric box from TruTrak that controls the elevator trim tab. When the strain gauge detects pressure on the elevator because of an out-of-trim condition, the device will automatically feed in trim to compensate and reduces the workload on the pitch axis servo. This function is wired in parallel with the normal electric trim button on the stick that the pilot uses so the trim input from the system can always be overridden. They call it their "Failsafe Automatic Pitch Trim". I believe that it only works in conjunction with the autopilot engaged, however. It would be cool if would also auto-trim for different power settings when the autopilot was disengaged.
I've included a picture of the linkage below and more information from TruTrak's web site below as well. Seems like a really cool device.
Here's a link to the Manual:
http://www.trutrakap.com/documents/AutomaticPitchTrim.pdf
Matt Dralle
RV-8 #82880 N844RV (res)
[url=file://C:\Incoming\2008.10.20%20-%20RV-8%20-%20TruTrak%20Autopilot%20Pitch%20Servo%20With%20Auto%20Elevator%20Trim%20Sensor%20Linkage%20(1).jpg] [img]cid:.0[/img][/url]
[img]cid:.1[/img]
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