Today's Message Index:
----------------------
1. 01:39 AM - Re: Tailplane torque tube bushing question (Kingsley Hurst)
2. 07:20 AM - Re: Tailplane torque tube bushing question (G&TPowell)
3. 01:49 PM - Re: Tailplane torque tube bushing question (Laptop JR)
4. 03:05 PM - Torque Tube CLAMP Mod Prices:- (R.C.Harrison)
5. 06:42 PM - Dive to Vne (Martin Tuck)
6. 11:44 PM - Handling characteristics (Rman)
Message 1
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Subject: | Re: Tailplane torque tube bushing question |
George,
I take it that the TP5 sleeve (at the root end of the tailplane) slides
easily along the torque tube TP4 until the torque tube begins to enter TP6
(the sleeve with the pip pin hole).
As I see it, there is more than one scenario that could cause this.
1 The TP5 sleeve could be slightly out of alignment causing the torque
tube not to want to enter TP6. On forcing the alignment during rigging, TP5
would then bind on the torque tube and jam.
2 TP6 may be slightly out of alignment which would cause it to bind as
the torque tube enters it.
3 There may be a slight film of epoxy or similar on the inside of TP6
4 TP6 may have been shrunk. This can happen if grooves were ground
around its periphery to enable better bonding (the heat causes the sleeve to
shrink - Ask me how I know this !)
5 Any combination of the above.
If TP5 is tight all the way along TP4, either 3 or 4 above may apply ?? If
TP5 IS indeed tight all the way, will the tailplane fit on the wrong end
of TP4 torque tube ?
I think it is important to properly identify the problem before trying to
determine a fix.
Good luck
Kingsley in Oz.
> I purchased an XS kit in 2003 and never got my Accelerated Stage I kit,
> due to the collapse of EMIL. Later, I purchased the tailplanes already
> built from a charity that got them from someone's estate. The torque tube
> TP4 is extremely tight when I try to put the tailplanes on, and it is
> nearly impossible to get the TP4 to seat properly in the TP6 sleeve
> already bonded into the tailplanes (the TP12 pins will not seat into the
> TP13 bushes, due to the difficulty in getting the torque tube in). If I
> can't get the tailplanes on in my shop, I certainly won't be able to get
> them on the completed airplane.
Message 2
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Subject: | Re: Tailplane torque tube bushing question |
Thanks to all for the replies.
To answer the points raised, I did lubricate TP4, but with Teflon white lithium
grease, as I saw suggested on another thread. This helped some, but not much.
The TP4 does slide through TP5, but not very easily on one side.
I did check for epoxy contamination; I believe that both TP5 and TP6 are clean.
I opened up the bottom of the tailplane to check the integrity of the TP6 join,
and I found that a few blobs of epoxy had dripped between the joints of the
foam in the empty foam tube area between TP5 and TP6. I thought that these
might be binding the TP4 as it passed through. Removing these little blobs helped
a little.
With the bottom of the tailplane open, I can easily see the TP4 when it reaches
TP6. The serious binding begins when TP4 enters TP6.
The points raised by Kingsley seem possible, if not probable. As I did not construct
these tailplanes, I don't know how well they were made when the TP5 and
TP6 sleeves were set. It seems entirely possible that one or the other (or both)
are not in alignment. From visual inspection of the TP6 it does not appear
that grooves were cut in it to "key" the epoxy bond, so I don't think that
would have contributed to TP6 "shrinking".
I am glad I opened up the bottom to check this, as I will now roughen the surface
of TP6 with a dremel or drill when doing the layup described in Service Bulletin
006.
If I have to remove TP6 (and/or TP5) to reset them, what is the proper technique
to do so?
Your suggestions are greatly appreciated.
George Powell
Visit - www.EuropaOwners.org
Message 3
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Subject: | Re: Tailplane torque tube bushing question |
And Kingsley and George
If one of the bushes are out of line, only tightening when the second is
mounted on the tube - then a heat cure while mounted might free them by
letting them go into alignment?
JR (bob) Gowing also in Oz
do not archive
----- Original Message -----
From: "Kingsley Hurst" <hurstkr@redzone.com.au>
Sent: Monday, September 17, 2007 6:36 PM
Subject: Re: Europa-List: Tailplane torque tube bushing question
> <hurstkr@redzone.com.au>
>
> George,
>
> I take it that the TP5 sleeve (at the root end of the tailplane) slides
> easily along the torque tube TP4 until the torque tube begins to enter TP6
> (the sleeve with the pip pin hole).
>
> As I see it, there is more than one scenario that could cause this.
>
> 1 The TP5 sleeve could be slightly out of alignment causing the torque
> tube not to want to enter TP6. On forcing the alignment during rigging,
> TP5 would then bind on the torque tube and jam.
>
> 2 TP6 may be slightly out of alignment which would cause it to bind as
> the torque tube enters it.
>
> 3 There may be a slight film of epoxy or similar on the inside of TP6
>
> 4 TP6 may have been shrunk. This can happen if grooves were ground
> around its periphery to enable better bonding (the heat causes the sleeve
> to shrink - Ask me how I know this !)
>
> 5 Any combination of the above.
>
> If TP5 is tight all the way along TP4, either 3 or 4 above may apply ??
> If TP5 IS indeed tight all the way, will the tailplane fit on the wrong
> end of TP4 torque tube ?
>
> I think it is important to properly identify the problem before trying to
> determine a fix.
>
> Good luck
> Kingsley in Oz.
>
>
>> I purchased an XS kit in 2003 and never got my Accelerated Stage I kit,
>> due to the collapse of EMIL. Later, I purchased the tailplanes already
>> built from a charity that got them from someone's estate. The torque
>> tube TP4 is extremely tight when I try to put the tailplanes on, and it
>> is nearly impossible to get the TP4 to seat properly in the TP6 sleeve
>> already bonded into the tailplanes (the TP12 pins will not seat into the
>> TP13 bushes, due to the difficulty in getting the torque tube in). If I
>> can't get the tailplanes on in my shop, I certainly won't be able to get
>> them on the completed airplane.
>
>
>
Message 4
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Subject: | Torque Tube CLAMP Mod Prices:- |
I am pleased to announce the availability of prices of the parts to
effect this modification.
Should you be interested and haven't received pricing details today
please e-mail me direct with your request.
Best regards
Bob Harrison.
Robt.C.Harrison
Message 5
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Hi Guys,
The 'Dive to Vne' as part of the UK annual inspection was mentioned again.
In my mind Vne is a maximum design speed for the aircraft, first
calculated and then demonstrated by the manufacturer (probably with some
margin) as part of the 'proof of design' test program. It is a test that
takes the airframe close to the outer edge of the envelope and I don't
think one to be undertaken lightly particularly by your average private
pilot.
The test has two possible outcomes and to me a positive result is not
worth the risk of the alternative.
Is there anyway the PFA can persuade the CAA to rethink the need for
this test as part of an annual check - or at least set some standards as
to who can perform the test, no passengers, entry and exit altitudes,
wearing of helmet/parachute in case the test proves negative, etc.
Maybe a requirement to dive to 90% of Vne would be a satisfactory
compromise?
Regards,
Martin Tuck
N152MT
Wichita, Kansas
Message 6
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Subject: | Handling characteristics |
All,
There is a very good article in this months Kitplanes (page 19) in which
one of the test pilots gives the Europa very high ratings in the
handling category. Puts it right up there with some of the best. He
also credits Ivan Shaw as being one of the top designers in experimental
aviation...
Jeff - Baby Blue
329 hours
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