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  #1  
Old 02-24-2016, 07:16 PM
rightrudder rightrudder is offline
 
Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,846
Default Electric elevator trim tab setup

Just thought I'd throw this out there. Originally, I had about 2/3 up trim, 1/3 down trim, but I'm finding that 3/4 up and 1/4 down works much better...far easier to stabilize at 65 knots in the pattern. Check those clevis pins and keep them lubricated; they're not the hardest material and I suspect they'll wear out sooner than you might think.

Everything looks good under the cowling at 11.3 hours into Phase 1. Oil consumption was maybe a quart total, and that's running it pretty hard, 65 to 75 percent power most of the time. I'm gonna continue this regimen for the next 10 hours or so and carefully track it. So far, not too much is puking onto the exhaust through the breather tube, but maybe that's because I'm keeping it at just over 6 quarts.

I cut down the baffle air dams to about 1/3 of their original size, and initial climb temps are coming down. CHTs in "performance cruise" are in the 360-370 range with a 65-degree OAT, with only about a 15-degree variance, and yes, No. 3 is the hottest. Will try the washer trick.

Today, the OAT at 6500' was about 48 degrees, and I used the heater for the first time. Veeerrrry effective, with the heat muff that surrounds both crossover tubes.

I'm still landing a bit long...this thing is a kite on approach compared to what I'm used to!
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RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019!
Tail number N427DK
Donation made for 2021
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart

Last edited by rightrudder : 02-24-2016 at 07:25 PM.
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  #2  
Old 02-24-2016, 07:48 PM
Soarandtow Soarandtow is offline
 
Join Date: Feb 2015
Location: Wynne, AR
Posts: 60
Default

Glad to hear your flying and all is well thus far.
Keep us all posted
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RV9 99% built 1% Togo
N61LD
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  #3  
Old 02-24-2016, 08:05 PM
rockwoodrv9 rockwoodrv9 is offline
 
Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,717
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Very cool Doug. I cant wait to get to phase 1. Are you posting pictures and experiences anywhere?

I worked on my trim today. I am ready to mount and have the D-Sub pins all done. Now I just need to figure out what wire coming from my garmin and VP to hook to it!!
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O-320 D2A
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  #4  
Old 02-25-2016, 08:07 AM
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airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,384
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Only 8.1 hours on my Phase I so far, but I have found that I am only using about 10% of my trim tab travel, if that.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 750 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #5  
Old 02-25-2016, 01:30 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,297
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Quote:
Originally Posted by airguy View Post
Only 8.1 hours on my Phase I so far, but I have found that I am only using about 10% of my trim tab travel, if that.
Then you either haven't begun to learn to slow down on approach like you should, you are not using flaps, you don't trim to anywhere neutral while flying a landing approach, or you have a very aft C.G. (or a combination of all of these).

The OP's post about pitch trim tab travel is right on.
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Van's Aircraft Engineering Prototype Shop Manager
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RV-6A (aka "Junkyard Special ")
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  #6  
Old 02-25-2016, 03:26 PM
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airguy airguy is offline
 
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Location: Garden City, Tx
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Quote:
Originally Posted by rvbuilder2002 View Post
Then you either haven't begun to learn to slow down on approach like you should, you are not using flaps, you don't trim to anywhere neutral while flying a landing approach, or you have a very aft C.G. (or a combination of all of these).

The OP's post about pitch trim tab travel is right on.
Part of that is true - I'm still flying fast approaches (learning to slow it down) and I'm only using 2 notches of flaps for landing (so far), and I'm not trimming to neutral for slow flight because that's only the flare portion of the landing for me. I'm still breaking in the engine and fighting oil temps, I haven't gotten to the slow flying part yet.

I don't mind holding the stick forces for landing, it's 30 seconds and the forces are light. I'm not going to be running the trim around much until I've got more time in the seat, aside from cruise conditions.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 750 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #7  
Old 02-25-2016, 02:23 PM
rightrudder rightrudder is offline
 
Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,846
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Quote:
Originally Posted by rockwoodrv9 View Post
Very cool Doug. I cant wait to get to phase 1. Are you posting pictures and experiences anywhere?

I worked on my trim today. I am ready to mount and have the D-Sub pins all done. Now I just need to figure out what wire coming from my garmin and VP to hook to it!!

It will be sooooo worth it! Hang in there!

I'll do a 20 hour update. I just haven't had the chance to take any pictures, what with dialing in the EFIS, listening for funny engine sounds, etc. Some very pretty rock formations, etc. in the high desert. I'll try to get some video with the V-stab camera at some point too.

I'll say, it's a lot more comfortable at 10 hours than 5, as I'm building a lot of trust with the engine.
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RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019!
Tail number N427DK
Donation made for 2021
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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