aileron controls
Posted: Fri Feb 17, 2012 9:17 pm
<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> Paul,
I just finished the aileron control area. The only horn that hit on my a/c was the left one. It just barely hits the beam flange where the beam turns down. Upon measuring the aileron deflections, I found that when you pull the mixer arm up as far as it will go the ailerons will be up with 10 degrees of reflex from the "neutral position". Be sure to note that the mixer arm in the neutral position is 7/8" down from the upper stop. I thought there was only to be 6 deg of reflex although I have heard of people with 12 deg.
I therefore will limit my up pull on the mixer arm so that the horn does not hit. Six deg of reflex leaves plenty of clearance. I read somewhere in this list that someone either bends the beam flange out of the way or cuts it for the required clearance.
One of the problems that I encountered was that when the flaps are put down, they do not give equal deflection. There is about 2 deg difference between left and right when the flaps are dropped to 25 deg. 25 deg of flap is all I could get. Also in the 10 deg reflex position there is also a 2 deg difference. At 6 deg reflex the difference is negligible. I am convinced that the control geometry is wrong. In the early Rebel Rouser editions there were some mentions of this problem but I did not pay too much attention to it. Maybe my instructions are outdated and or wrong. I have elected to continue regardless of these discrepancies.
About 3 weeks ago I posted to this list a copy of my request to MAC for the aileron info. After at least a week with no response I called the factory for the info. In conflict with the info posted in the mainenance manual available at the MAC website, I was told that there is no way you can get 20 deg up aileron. Well, that is true using the stock components.(Heck, maybe my parts are wrong!!!) I was quoted 15-18 degrees up with 10-12 down. I tried to get further verification of the aileron "neutral position" and travel requiremnets but after a couple of calls with promises of return calls that never happened I finally gave up on the factory offering any help in this critical area. There does not seem to be much differential on my set up. I get almost as much down travel as I do up travel.
Boy those bellcrank bearings are awfully sloppy. This is another area that you will want to repair/replace or redesign.
Good luck you'll need it,
Rick D.
PMi4218393@aol.com wrote:
I just finished the aileron control area. The only horn that hit on my a/c was the left one. It just barely hits the beam flange where the beam turns down. Upon measuring the aileron deflections, I found that when you pull the mixer arm up as far as it will go the ailerons will be up with 10 degrees of reflex from the "neutral position". Be sure to note that the mixer arm in the neutral position is 7/8" down from the upper stop. I thought there was only to be 6 deg of reflex although I have heard of people with 12 deg.
I therefore will limit my up pull on the mixer arm so that the horn does not hit. Six deg of reflex leaves plenty of clearance. I read somewhere in this list that someone either bends the beam flange out of the way or cuts it for the required clearance.
One of the problems that I encountered was that when the flaps are put down, they do not give equal deflection. There is about 2 deg difference between left and right when the flaps are dropped to 25 deg. 25 deg of flap is all I could get. Also in the 10 deg reflex position there is also a 2 deg difference. At 6 deg reflex the difference is negligible. I am convinced that the control geometry is wrong. In the early Rebel Rouser editions there were some mentions of this problem but I did not pay too much attention to it. Maybe my instructions are outdated and or wrong. I have elected to continue regardless of these discrepancies.
About 3 weeks ago I posted to this list a copy of my request to MAC for the aileron info. After at least a week with no response I called the factory for the info. In conflict with the info posted in the mainenance manual available at the MAC website, I was told that there is no way you can get 20 deg up aileron. Well, that is true using the stock components.(Heck, maybe my parts are wrong!!!) I was quoted 15-18 degrees up with 10-12 down. I tried to get further verification of the aileron "neutral position" and travel requiremnets but after a couple of calls with promises of return calls that never happened I finally gave up on the factory offering any help in this critical area. There does not seem to be much differential on my set up. I get almost as much down travel as I do up travel.
Boy those bellcrank bearings are awfully sloppy. This is another area that you will want to repair/replace or redesign.
Good luck you'll need it,
Rick D.
PMi4218393@aol.com wrote:
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Hi everyone.
Fuselage is done up to the firewall on s/n 374. I had some time off so I pulled everything out of the interior and primed it. That's going to be the finish for the interior; it's a utility airplane right? . Reinstalled everything back in and it feels good
to know that a lot of it doesn't have to come back out again!
While putting everything in place I noticed that the control horns that attach to the control tubes will hit the aft spar when either control tube between them and the mixing unit are in the most upper position. Has anyone else come across this and if so wha
t's an appropriate fix? Shift the hanger inboard or shorten the control rods?
Hopefully starting the tail mods this weekend.
Paul Michel
Rebel #374
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