Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
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 Posted: Sat Apr 02, 2011 8:49 am Post subject: Heavy Right Wing... (Follow Up) |
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Last night I went out and measured the position of the left aileron and found it to be pretty darn close to perfect on both inboard and outboard edges. I measured the right aileron and noted that the outboard edge was about 1/32 lower than the inboard edge. So, I thought I'd try splitting the different between the original location and the current one. I went out test this new setting and to my amazement and jubilation, the trim is almost dead center across the speed range of 170-230mph. A little tap either way easily accounts for fuel burn on a given side. I also noted that the skid ball is nicely dead center across those speed ranges. Yahoo! One less thing to worry about!
Thanks to everyone on the List for their input! Very much appreciated!
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Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 160+ Hours TTSN - Paint job is all that's left...
At 09:27 AM 4/1/2011 Friday, you wrote:
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After a good night's rest I got to thinking about these most recent observations. Dropping the RIGHT aileron a 1/16" caused the trim requirement at high speed to go from the previous full-LEFT to a full-RIGHT setting. Wouldn't this imply that now the LEFT aileron needs a similar adjustment perhaps? Maybe only a 1/32" on the left side? Seems that if a given aileron that was too HIGH was dropped too much it would still cause the same drag/trim problem if its too LOW? So the fact that now my trim is completely the opposite implies that the RIGHT aileron is probably now exactly on and moreover, it was TWICE as much too high as the LEFT aileron still is.
Does any of this make sense?
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Matt Dralle
At 08:47 PM 3/31/2011 Thursday, you wrote:
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>Thanks to everyone for the great feedback on this issue!!
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>I went out after work tonight and had a look at the aileron alignment and sure enough, the outboard edge of the right aileron was high by about 1/16-3/32 of an inch. I took the hinge off the aileron and elongated the holes slightly and reassembled, dropping the outboard side by about 1/16". I went out and took it up to about 220mph and now - are you ready for this - it requires full RIGHT trim! Completely the opposite from before. So, obviously I need to reduce the drop by 50% and I should be dead-on neutral trim! Its amazing to me how such a little movement had such a HUGE impact on the trim. No, aileron edge smooshing necessary, by the way! Whew!
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>Best,
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>Matt Dralle
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>At 09:10 AM 3/31/2011 Thursday, Matt Dralle wrote:
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>>Dear Listers,
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>>Well, taking the RV-8 in for paint is getting closer and closer and I'm trying to get all the little things that need doing done before then. Dealing with the heavy right wing is the next thing on the list. Currently, at low speed I have about neutral aileron trim. The faster I go, the more LEFT trim I need. Above 200mph, I run out of left trim and the left aileron is noticeably "up", maybe .125" or so. Both of my ailerons are "chubby" at the trailing edge. I wanted to confirm with the List that "squeezing" the RIGHT aileron will add a bit of lift on the RIGHT side and hopefully neutralize the issue?
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>>Thanks!
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>>Matt
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