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fklein(at)orcasonline.com
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 Posted: Wed Apr 15, 2009 9:39 am Post subject: Trim Damper Assembly |
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All,
Before bonding on the top, I want to be certain that the Trim Damper
Assembly is properly adjusted, particularly w/ respect to the amount
of friction when it moves in the slot in TS01. As far as I can tell,
the Build Manual does not address this question, yet it would appear
to be key to having the pitch control system function properly without
burning up the pitch trim motor. I can't seem to get my mind around
the function of this seemingly elaborate confusion of spring, tube,
thru bolt, and nuts of various sizes...it's complexity suggests that,
when properly adjusted, it performs a critical function.
I reference Fig. 2, p. 19-2, and Step 4 & Fig. 6 on p. 19-4.
Can anyone please enlighten me on what proper adjustment would be?
Thanks in advance,
Fred
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frans(at)paardnatuurlijk.
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| Posted: Wed Apr 15, 2009 10:38 pm Post subject: Trim Damper Assembly |
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Fred Klein wrote:
| Quote: | Before bonding on the top, I want to be certain that the Trim Damper
Assembly is properly adjusted, particularly w/ respect to the amount of
friction when it moves in the slot in TS01. As far as I can tell, the
Build Manual does not address this question, yet it would appear to be
key to having the pitch control system function properly without burning
up the pitch trim motor. I can't seem to get my mind around the function
of this seemingly elaborate confusion of spring, tube, thru bolt, and
nuts of various sizes...it's complexity suggests that, when properly
adjusted, it performs a critical function.
|
It appears to me that the function is to take sudden load applications,
i.e. flutter, and to cancel out any slack in the system behind it,
particularly from the gears in the trim motor assembly. Any slack here
would induce flutter, and the trim damper assembly will make this slack
"invisble".
These trim motors are awfully strong, so I doubt you could adjust the
friction so much that the motor would not be able to move it anymore
and/or burn up.
Also, I believe that, despite the suggestion of "adjustable" components,
that the adjustable range is neglectible. If bolted together properly,
it is performing its intended job (whatever that may be).
| Quote: | Can anyone please enlighten me on what proper adjustment would be?
|
I guess everyone has another perception of that the proper adjustment
would be. As of so far no Europa's have come down due to inproper
adjustment, it appears that in reality the adjustment is not critical.
The ommission about this adjustment in the manual is a further
indication that it is not critical. 
I would suggest to set it halfway the available range. I can't recall
how I adjusted it, but most likely I set it halfway the available range
as well.
--
Frans Veldman
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raimo.toivio(at)rwm.fi
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| Posted: Thu Apr 16, 2009 1:49 am Post subject: Trim Damper Assembly |
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Hi Fred
I did it as follows:
According my building diary, 2nd February 2003 I purchased a simple fish scale (I hate fishing), connected it to the bellcrank TS03 by 90 degrees. I adjusted the damper unit until it gave up exactly when there was a force 4,5 kg = 10 lbs when I pulled the fish scale. I do not remember from where I got this tip to complete the task. I assume 4,5 kg is a medium size fish!
That was the first and last time all together I use fish scale in my life time. That scale is in my buiding museum now.
I confirm my stabs have done their job well.
Raimo OH-XRT
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g-iani(at)ntlworld.com
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| Posted: Thu Apr 16, 2009 9:39 am Post subject: Trim Damper Assembly |
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Fred
I do not think the adjustment is very critical. I did mine up tight at
first and the result was that it juddered. That is the friction stopped it
moving at all until the forces were quite high. It then jumped a short
distance and did it again. I loosened it off until it stopped juddering and
it has work perfectly since.
Ian Rickard G-IANI XS Trigear, 200 hours
Europa Club Mods Rep (Trigear)
e-mail mods(at)europaclub.org.uk
or direct g-iani(at)ntlworld.com
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gccole13(at)btinternet.co
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| Posted: Sat Apr 18, 2009 7:26 am Post subject: Trim Damper Assembly |
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Fred,
I have an email from Andy Draper, dated may, 2002, which could be out of date by now. This states:
The correct force that the friction damper should resist is 5kg +0/-1kg at 90 degrees to the long arm (the one that the servo attaches to)
At the time I thought this was a hell of a load and I settled for the lower end of the range.
Since you still have the top off, you could check that the trim tab servo internal limit stop on full nose up trim cuts in before the trim bellcrank hits the tab link rod when full up elevator is applied ( a very unlikely combination I know). On my early mono wheel kit I had to shorten the two plastic clevis forks by 3mm so that they could bottom out when screwed on to the servo link rod. Maybe the factory made this mod on later kits.
Gerry Cole
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raimo.toivio(at)rwm.fi
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| Posted: Tue Apr 21, 2009 3:40 am Post subject: Trim Damper Assembly |
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[quote] ---
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