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bdanbish(at)gmail.com
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 Posted: Sun Sep 21, 2008 9:59 pm Post subject: Adjusting the tailplanes |
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Hi all,
I've been double checking my tailplanes prior to putting the top on and found some discrepencies from my orginal measure measurements of 5 deg. down and 13 deg up. I assume this is from the upgrade to mod 70. Sure thought I had it adjusted, but glad I checked.
So, instead of the above, I have 5.7 deg down and 11.2 deg up. Maybe someone out there can save me some head scratching and a whole lot of hassle fiddling with bolts in and out numerous times to get this set right, so here are my questions:
1) The TP18 has a rod end on it (TP18C). I seem to remember this is what I'll use to make adjustments. Will screwing that out (more threads showing) give me more degress of upward travel as I need? Or should it be screwed in more?
2) Does the Main pitch push rod need to be adjusted also?
I know this may seem like a simple thing to figure out but I know someone's bound to have made a lot of these adjustments and has a simple way to get the right results.
As always, your help is much appreciated. 
Dan
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ptag.dev(at)tiscali.co.uk
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| Posted: Sun Sep 21, 2008 11:54 pm Post subject: Adjusting the tailplanes |
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Hi! Dan
Can't help with the adjusters but I recall 8 years ago finding out that
Andy Draper wanted 1 deg more than the 12 deg in the manual and wouldn't
do the first flight test until I got it to 13 deg. actually by grinding
away the balance weight "up stop". I think the adjusters mostly only
change the range of operation to the control stick (may be wrong here)
but I think the limiting factor is always the bump stop of the balance
weights at the top and bottom.
Regards
Bob Harrison G-PTAG
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bdanbish(at)gmail.com
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| Posted: Mon Sep 22, 2008 4:09 pm Post subject: Adjusting the tailplanes |
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Ah, that makes sense. Except if too much weight is taken off to get them in balance? Thanks for the help.
Dan
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bdanbish(at)gmail.com
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| Posted: Mon Sep 22, 2008 11:55 pm Post subject: Adjusting the tailplanes |
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I was able to figure it out tonight, it wasn't as much trouble as I thought it was going to be.
After removing the weights and cables from the TP18 rod and disconnecting it so I could adjust it, unscrewing it has the effect of increasing the up direction without affecting the down position much. I was able to get both to 13.3 deg up and 5.0 deg down. The .3 will come out when I add a bit of cushion to the top of the mass balance tower.
I measured from the middle of the tailplane, at the outside point of the trim tab. I assume this isn't critical.
I feel like I got it nail this time. Thanks for the input.
Dan
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ptag.dev(at)tiscali.co.uk
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| Posted: Tue Sep 23, 2008 12:35 am Post subject: Adjusting the tailplanes |
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Hi! Dan
I don't know who you were replying to? But if it was a response to my
message I didn't intend you to remove any material from the balance
weights but to thin the bump stops.
Regards
Bob Harrison G-PTAG
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bdanbish(at)gmail.com
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| Posted: Tue Sep 23, 2008 10:24 am Post subject: Adjusting the tailplanes |
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Just confirming that I got things set right. Thanks for the input.
Dan
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