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  #1  
Old 03-02-2019, 10:50 AM
MConner MConner is offline
 
Join Date: Mar 2018
Location: Snead Island, Florida
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Default AOG RV-10

(Temporary fixed to get home, original thread left up for information)


On landing the pitch trim would only run nose down from either stick, not up at all. After landing and fiddling with it I see that the tab on the copilots side is full up and the pilot side is just a little nose up above neutral.

Suggestions?
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Last edited by MConner : 03-02-2019 at 03:23 PM.
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  #2  
Old 03-02-2019, 11:02 AM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default If

If the tab is full up that means it is commanding full nose down trim. The Rv-10 needs far more up trim than down and the way van designed the trim tabs, only one tab is used for Nose down trim; the other will be about neutral...

Now why it isn’t moving, well that’s another question...
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Last edited by rocketman1988 : 03-02-2019 at 11:07 AM.
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  #3  
Old 03-02-2019, 11:16 AM
MConner MConner is offline
 
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Thanks Bob. Is there only one trim motor? I did not build the plane and am not familiar with the location of the motor or how it is reversed.

Anyone with guidance can call me 941. 730. 5632
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  #4  
Old 03-02-2019, 11:42 AM
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Carl Froehlich Carl Froehlich is online now
 
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Quote:
Originally Posted by MConner View Post
Thanks Bob. Is there only one trim motor? I did not build the plane and am not familiar with the location of the motor or how it is reversed.

Anyone with guidance can call me 941. 730. 5632
Remove the eppennage fairing and examine the trim motor/cam/control cable arrangement. From there you can trouble shoot your problem.

You will need to provide more information on what you using for trim motor controller, as in Safety Trim, Dynon Autopilot module, etc.

Carl
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  #5  
Old 03-02-2019, 12:09 PM
rdrcrmatt rdrcrmatt is offline
 
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Location: Milwaukee, WI
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Are you stuck at an airport away from home?


What trim system and control system do you have? What trim switches do you have and where are they located?

I've had to replace the hat switches in my infinity grips already (120hrs)
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  #6  
Old 03-02-2019, 12:43 PM
MConner MConner is offline
 
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Thanks Matt, got some tools, headed back to the plane now.
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  #7  
Old 03-02-2019, 01:01 PM
lr172 lr172 is offline
 
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Quote:
Originally Posted by MConner View Post
Thanks Bob. Is there only one trim motor? I did not build the plane and am not familiar with the location of the motor or how it is reversed.

Anyone with guidance can call me 941. 730. 5632
There is only one trim motor and it actuates a lever system to control both tabs via cable. If the motor is moving in one direction, but not the other, your problem likely lies with the relays or grip switches/wiring. When using a grip, you must have individual relays for up and down power delivery to the trim motor. These can be home made or on board purchased from providers. Operation in a single direction points to one of those relays failing or it's wiring.

I am guessing that you didn't command the full up trim and that could also point to your grip wiring touching a ground somewhere. The constant stick movement can wear the insulation off the wire if not carefully secured. Turn on the master and see if the trim motor is running against it's stop. Your stick switches typically provide a ground to the relay for activation. In this case, a shorted wire merely activates the relay and doesn't pop a CB. If you did command all that trim via testing, look at the relays as mentioned above.

Larry
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Last edited by lr172 : 03-02-2019 at 01:13 PM.
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  #8  
Old 03-02-2019, 01:05 PM
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Ironflight Ironflight is offline
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We don’t know how you’re wired, but a common failure with the early Ray Allen trim relays was that they’d only run one direction when they start to go. You can tell if you try the trim with teh cokpit silent, and see if you can hear a relay click - in either direction.

They eventually went with a newer relay that hasn’t had reported issues.

Paul
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  #9  
Old 03-02-2019, 01:22 PM
moosepileit moosepileit is offline
 
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Thoughts as a non-RV-10 flyer or builder.

Where are you? Home field in your hangar or AOG on the road? Any RV-10 builders or maintainers nearby?
Is there a hangar available?
Can you get home from there without the plane?

Has the RV-10 been flown with the elevator trim set near nuetral and inop? How can it be secured in a flyable setting and what indications do you have if the pitch trim is depowered?

Assumes Day, VMC, No autopilot or pitch trim inputs powered. What would you lose?

May require flaps retracted or nearly so. Are you and the runways ready for no flaps?

What weight/balance could it be done at? What speed range and control loading?

How much stick force and travel difference will there be for hands free cruise at 110 knots or some other number? Is the no-flap takeoff and no flap landing trim setting the same?


The -10 may be the least suitable RV for this option, so just throwing it out to have darts thrown at the idea.
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Last edited by moosepileit : 03-02-2019 at 01:24 PM.
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  #10  
Old 03-02-2019, 03:21 PM
MConner MConner is offline
 
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Location: Snead Island, Florida
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Default Update

Ok I appreciate all the support. I can hear the relay clicking in both directions. I did run the trim full forward without meaning to a little at the time while troubleshooting it.

Thank you for being part of this forum and helping me understand how the system worked.
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Last edited by MConner : 03-02-2019 at 03:33 PM.
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