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  #1  
Old 01-15-2022, 03:03 PM
rondawes's Avatar
rondawes rondawes is offline
 
Join Date: Mar 2016
Location: Wylie, TX
Posts: 100
Default Trim indicator position in cruise

When I did the pre-buy on the RV-7A that I purchased, we noted that the trim position indicator was inop. The seller had it replaced as part of the deal.

When I'm in cruise and trimmed for level flight, the illuminated light bar is at the very bottom (indicating nose down). I suspect that's not normal but wanted to inquire what is typical.
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  #2  
Old 01-15-2022, 03:25 PM
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B Cunningham B Cunningham is offline
 
Join Date: Jan 2005
Location: Louisville, KY
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Default

The indicator should be set up to indicate the centered position when the trim tab is in the neutral position. You can determine that in your hangar, Whether or not you require nose up or down trim in cruise flight is dependent on several other factors. The indicator not being one of them.
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  #3  
Old 01-15-2022, 04:44 PM
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wcalvert wcalvert is offline
 
Join Date: Jan 2019
Location: Anacortes Wa
Posts: 443
Default Hmm... not so fast

My experience is different than the previous reply. Although I agree that the trim indicator has nothing to do with the flight of the aircraft, the trim range I saw after my build did not favor centering the neutral trim tab position in the center of the trim indicator travel.

In my plane at least, takeoff trim indicates about 1/4 up from the bottom, fast cruise nearly at the bottom, and landing at the top.

The original OP doesn't mention what indicator system he is using. I set the trim range using the trim setup routine in the Dynon Skyview.

This may all be caused by something like the ratio of the trim arm swing in relation to the tab throw, I don't know, but it is what it is.

Note: all of my parts are stock Vans electric trim system connected to a Dynon HDX display.
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  #4  
Old 01-16-2022, 09:09 AM
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rondawes rondawes is offline
 
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Location: Wylie, TX
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Default

Sorry for the omission, my -7A has the standard Ray Allen sensor and indicator.
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  #5  
Old 01-16-2022, 10:21 AM
Ralph Inkster Ralph Inkster is offline
 
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Location: Calgary, Alberta
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Quote:
Originally Posted by rondawes View Post
When I did the pre-buy on the RV-7A that I purchased, we noted that the trim position indicator was inop. The seller had it replaced as part of the deal.

When I'm in cruise and trimmed for level flight, the illuminated light bar is at the very bottom (indicating nose down). I suspect that's not normal but wanted to inquire what is typical.
Ive flown a lot of RVs & they all indicated differently. Totally depends on how the linkage is set.
Only moment I even look at the indication is during run up (close to center good enough, Id adjust for climb out by feel). I trim for cruise by feel.
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