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fklein(at)orcasonline.com
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 Posted: Sat Jun 23, 2007 1:03 pm Post subject: Tailplane Torque Tube |
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Jim,
What with the recent discussion of tailplane issues and my need to
address mis-aligned TP13 bushes, I came across your post in 2006. After
reading resultant posts on your thread, I'm curious how you proceeded
and how you feel about your results. When you mention using a machine
shop to make your holes, does that mean you removed your torque tube
from your completed aircraft in order to do the shop work? What kind of
a job was that?...I didn't realize it was feasible...
Fred
A194
On Monday, October 23, 2006, at 04:05 PM, Jim Butcher wrote:
| Quote: | Recent inspection has revealed excessive play in our port tailplane.
The problem is play in the torque tube pin. We incorporated Mod 62
(larger pins) during our build so that’s not an option.
Our Tech Counselor suggested using AN386 taper pins. He said they are
commonly used for similar applications in certificated aircraft. AC
43-13 confirms that AN386 pins are used in joints where "the absence
of play is essential".
A search of this forum suggested that the inner tube (TP4) would crush
and bind in the bearing (TP11) if tapered pins were used. Our thoughts
are to Loctite a 12" length of 1.375" OD .093" wall 4130 steel tubing
centered inside of TP4. This would prevent the crushing of TP4 and 12"
allows it to span the TP11 bearings. We would use a machine shop to
accurately make the tapered holes for AN386-3 pins. The tapered pins
would be installed vertically since there is not much material left on
TP9 (the center bracket) from the installation of 3/8", Mod 62 pins.
In the original design, the pins also locate TP10 sleeves against TP11
bearings inside the fuselage to prevent left - right torque tube
movement. We would like to locate TP10 independently of the pins. Our
thoughts are to machine TP10 sleeves to fit outside the fuselage
between TP12 and TP11 to achieve the same purpose. Alternatively, we
could split or slot TP10 and secure them to TP12 inside the fuselage
with hose clamps (Oetiker style for 360 deg contact).
Comments?
Jim & Heather Butcher
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h&jeuropa
Joined: 07 Nov 2006
Posts: 645
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| Posted: Sun Jun 24, 2007 5:37 am Post subject: Re: Tailplane Torque Tube |
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Fred,
Yes we have installed taper pins and although we haven't flown with them, they are very secure and there is no play in the system. We did it a little differently than described initially. We loctited a tube inside the torque tube as descirbed and we opened up the original holes to accept the taper pins so they are horizontal. Since we had the oversize pins in place, there wasn't much material left on TP9, so our machine shop made steel rings which were welded in place on each side of TP9 to provide a reasonable amount of material for the taper pins. On the outer end, we just installed taper pins thru the nylon sleeve like original. Others who have the original 1/4" pins have just replaced them with taper pins as there is plenty of material available.
We found that removing the torque tube assembly is not difficult just working through the access hole on the stbd side and viewing through the little hole at the base of the vertical fin on the stbd side. The most difficult part is attaching the mass balance assembly and pitch push rod to TP9!
Jim Butcher
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grahamsingleton(at)btinte
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| Posted: Sun Jun 24, 2007 2:43 pm Post subject: Tailplane Torque Tube |
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Fred
I've only done it once, but it took me an hour and a half to get the
torque tube out of an XS recently, ( year or so ago) I didn't crawl in
the back.
It took two of us about 4 hours to get it all back again, also without
crawling down the back.
This XS mono had my tailwheel/rudder drive mod so there was an extra
access hole below the stab which helped get another hand in to hold a
spanner.
Graham
Fred Klein wrote:
| Quote: | Jim,
What with the recent discussion of tailplane issues and my need to
address mis-aligned TP13 bushes, I came across your post in 2006.
|
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grahamsingleton(at)btinte
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| Posted: Sun Jun 24, 2007 2:55 pm Post subject: Tailplane Torque Tube |
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Jim
my understanding is that enlarging the pin holes more than about 3/8"
will start to weaken the TP9, have you increased the size much from 3/8?
Graham
hoping for a ride one day when you have the long wings installed!
h&jeuropa wrote:
| Quote: |
Fred,
Yes we have installed taper pins and although we haven't flown with them, they are very secure and there is no play in the system. We did it a little differently than described initially. We loctited a tube inside the torque tube as descirbed and we opened up the original holes to accept the taper pins so they are horizontal. Since we had the oversize pins in place, there wasn't much material left on TP9, so our machine shop made steel rings which were welded in place on each side of TP9 to provide a reasonable amount of material for the taper pins. On the outer end, we just installed taper pins thru the nylon sleeve like original. Others who have the original 1/4" pins have just replaced them with taper pins as there is plenty of material available.
We found that removing the torque tube assembly is not difficult just working through the access hole on the stbd side and viewing through the little hole at the base of the vertical fin on the stbd side. The most difficult part is attaching the mass balance assembly and pitch push rod to TP9!
Jim Butcher
|
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h&jeuropa
Joined: 07 Nov 2006
Posts: 645
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| Posted: Wed Jun 27, 2007 3:21 am Post subject: Re: Tailplane Torque Tube |
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Graham,
TP9 was reinforced with steel rings welded to each side. The largest portion of the taper pin is .447 inches.
Jim
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