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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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 Posted: Sun Oct 08, 2006 12:52 pm Post subject: MKIII Trim Tabs (subject changed) |
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| Now, should I fly the Mark III with that gigantic vertical trim
removed or
| not? Taxied and hot taxied and seemed like I had some rudder effect
on the
| ground without the 12x7" hunk of bent aluminum on the tail...?
What's the
| worst scenario?
|
| jsf
John F:
My old mkIII flies about as well out of trim as it does in trim.
Can't really detect much difference.
Most folks automatically assume the aircraft is not rigged corrected
when they fly a mkIII without the proper rudder trim. However, I have
found through the years, adverse yaw is primarily caused by the nature
of Kolb aircraft design, especially mkIII's with high horse power
engines, 65, 80 and 100. I think it has to do with the way the prop
wash hits the tail section, primarily. Sometimes engineers,
scientists, and great thinkers, have a difficult time realizing this
simple problem and the simple solution to correct it. I am sure they
can find their answer with a calculator or a computer. I did not do
it that way. I experimented with changing thrust line, changing
leading edge position of the upper vertical stabilizer, and good old
fashioned sheet metal trim tabs. Only the trim tab worked, and it
took some time and energy to get the correct size and angle. Now my
mkIII with 912ULS flies in trim without aid of a heavy foot on the
rudder pedals.
If you are interested in the size and angle I use on my mkIII, next
time I am at the airstrip I will get that info for you. If you are
interested enough, you can do a search in the archives, because I have
posted this info, more than once, in the past. That is what makes the
archives so important, and that is why it is important to use the
correct subject line and keep your msgs informational.
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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jsflan(at)valornet.com
Guest
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| Posted: Sun Oct 08, 2006 3:24 pm Post subject: MKIII Trim Tabs (subject changed) |
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|
Appreciate the guidance from so many. Would have tried the MIII today
without the trim tab but winds all day and from looks of shredded clouds to
north where airport is, probably pretty rough upstairs. Will report if and
when. Thanks,
jsf
do not archive
---
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