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  #1  
Old 06-09-2010, 12:21 AM
chriscencula chriscencula is offline
 
Join Date: Mar 2008
Location: Northern California
Posts: 49
Default Autopilot servo location in RV-6

I'm trying to decide how to mount the roll servo in my RV.

I've got both wings with top skins & inboard bottom skins attached.
Trying to decide between putting the servo in the wing VS fuselage...
TruTrak shows the servo mounted in the wing just outboard of the inspection hole (close to the next most outboard rib). The axis of (rotation of) the servo arm is perpendicular to the axis of the the bellcrank to which it attaches...

The Dynon install has the servo under the floor behind the spar...
I wonder in an *actual* installation whether there are likely interference issues with either installation... Dynon: with the servo pushrod and lightening holes, stick bottom and servo rod-end bearing etc? Tru-Trak: interference between mounting bracket and the servo pushrod?

Would be great to hear from others who have completed this installation, particularly if there are good pictures either 1) available -OR- 2) to be taken?
Especially helpful would be the ability to view/inspect any installations in Northern California... May be able to meet at Golden West fly-in if you're 'in the neighborhood' this coming Friday or Saturday?

Some considerations :
1) Access for inspection/maintenance
2) Ease of installation
3) Preferred alignment of servo axis w/bellcrank axis (if mounted near bellcrank)
4) Minimize 'couple' formed by rod-end coupling being off-axis from bellcrank or control stick (to extent possible)


Thanks,
Chris
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  #2  
Old 06-09-2010, 06:54 AM
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Ironflight Ironflight is offline
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When we added the roll servo to Louise's -6, we put it under the seat, and the only modification required was a slight enlargement to the hole through which the aileron pushrod exits the fuselage (just needed a little notch). Keeping it all in the fuselage made the wiring simple, and access is reasonable - we have removed the servo a couple of times to get at the output arm screw, and it only takes a couple of minutes to get it out.

I haven't done a wing installation yet, so can't give you a direct comparison.

Paul
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  #3  
Old 06-09-2010, 02:53 PM
chriscencula chriscencula is offline
 
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Hi Paul,

Thanks for the reply...
A couple of additional questions:
1) Is the 'floor' in the area 'made' to be removable per Van's standard plans, or is this an 'extra feature' that was added to your plane for access to the servo etc?
2) Were there any other 'very close' clearance issues with moving parts pertaining to the servo installation?

Thanks,
Chris
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  #4  
Old 06-09-2010, 03:48 PM
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Ironflight Ironflight is offline
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Yes, that portion of the floor is removable - it is basically the seat pan, and how you get at the stick/aileron pushrods.

Placement is important to avoid interference when the stick and servo pushrods move full travel, but it is a no-brainer to find the "right" location. Everything is tight in a small airplane like this, so this is nothing unusual.

Paul
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RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
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  #5  
Old 06-09-2010, 04:18 PM
gasman gasman is offline
 
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Paul, Mel mounted his servo under the right seat, and connected the rod to the base of the stick. Could you draw us a better picture of how you did it? Thanks......... Warren
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  #6  
Old 06-09-2010, 05:07 PM
CNEJR CNEJR is offline
 
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Location: Conroe, Texas
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Default I had mine mounted in my 6.......

under the seat, but moved it to the last bay in the left wing. The way the servo pushrod was angled to the stick under the seat, I felt like it would always be controling roll while biasing the pitch. This would lead to the pitch always seeking. Since moving it to the wing, the roll pushes straight on the aileron bellcrank, with no bias on the pitch. Very eash to get to with left tip off. Works well, your results may vary.
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  #7  
Old 06-09-2010, 07:22 PM
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billnaz billnaz is offline
 
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Default seat install second

You can print up the instructions for the under seat install from the Dynon web site. It's well documented with good 3views. My install was uneventfull with just a little triming for clearance.
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  #8  
Old 06-10-2010, 12:27 AM
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Rosie Rosie is offline
 
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Location: I live in on the Rosamond Skypark (CA) and am married to Victoria (Tuppergal).
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Here's my TruTrak autopilot roll servo installation from last year Rosie



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  #9  
Old 06-10-2010, 06:31 AM
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Ironflight Ironflight is offline
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Mikey's looks just like the pictures Rosie posted - except on the other side.
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Editor in Chief - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
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Dayton Valley Airpark (A34)
http://Ironflight.com
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  #10  
Old 06-10-2010, 11:32 AM
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Michael White Michael White is offline
 
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Quote:
Originally Posted by Ironflight View Post
Mikey's looks just like the pictures Rosie posted - except on the other side.
Hey Paul,
Does Mikey have as much FOD in his underseat bays as Rosie does?
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