Today's Message Index:
----------------------
1. 01:27 AM - CAA Mode "S" Consultation Response (William Mills)
2. 08:33 AM - Debugging a TCU Problem (Paul McAllister)
3. 08:48 AM - Mod. 62 - Replacement of tailplane torque tube drive pins (Gert Dalgaard)
4. 08:49 AM - Re: Debugging a TCU Problem (Gilles Thesee)
5. 09:10 AM - Re: Mod. 62 - Replacement of tailplane torque tube drive pins (Richard Iddon)
6. 09:10 AM - Re: Debugging a TCU Problem (Gilles Thesee)
7. 09:42 AM - Re: Debugging a TCU Problem (Paul McAllister)
8. 10:27 AM - Re: Debugging a TCU Problem (Gilles Thesee)
9. 10:43 AM - Re: heavy wing (=?UTF-8?Q?R=C3=A9mi_Guerner?=)
10. 12:59 PM - Re: Mod. 62 - Replacement of tailplane torque tube drive pins (Duncan McFadyean)
11. 02:03 PM - gas cap for XS (ken carpenter)
12. 03:25 PM - Re: gas cap for XS (Raimo Toivio)
13. 09:15 PM - Re: Mod. 62 - Replacement of tailplane torque tube drive pins ()
14. 10:25 PM - Re: Debugging a TCU Problem ()
15. 10:48 PM - Re: Mod. 62 - Replacement of tailplane torque tube drive pins (Mike Parkin)
16. 10:49 PM - Re: Mod. 62 - Replacement of tailplane torque tube drive pins (Gert Dalgaard)
17. 11:01 PM - Re: Mod. 62 - Replacement of tailplane torque tube drive pins (William Mills)
18. 11:23 PM - Re: Mod. 62 - Replacement of tailplane torque tube drive pins (Gert Dalgaard)
Message 1
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| Subject: | CAA Mode "S" Consultation Response |
To All UK Recipients,
Have all the UK builders / pilots made a response to the CAA
Consultation Paper on the proposed implementation of Mode "S"? Just a
reminder to get your responses in by Tuesday 29th August. The more the
better. All details are on the PFA website.
Best wishes,
William
Do not archive
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| Subject: | Debugging a TCU Problem |
Hi all,
I am looking for some ideas on debugging a TCU - Turbo - waste gate issue.
The background is as follows:
About a year ago, every now and then the orange TCU light would flash. I'd
power cycle and it would go away. Over time it is almost at the point that
this happens every time. At first I thought it was just the waste gate
sticking, but after further investigation I realized that if the waste was
stuck, the servo would move and the cable would bow in and out. (Lockwood
confirmed this).
In my case what happens is the the servo just doesn't move. I can hear is
making the normal "growling" noise, but it doesn't do its normal cycle on
power up. If I start the engine and power cycle the TCU then all is well.
I asked the Lockwood guys and they think I have a faulty servo. I have
reseated all of the cables but it didn't make any difference. I really
don't want to buy a $370 servo just to find out it that its not the problem.
The next step is to go buy a servo to prove this theory, but before I do I'd
be interested in an other ideas.
Thanks, Paul
Message 3
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| Subject: | Mod. 62 - Replacement of tailplane torque tube drive pins |
OK, I have now done the Europa modification No 62!
Amen.
Easy to write, but believe me - a hard job.
I did the fix according to the factory recommendations, but actually
I feel that it's just a matter of time before the problem occurs again.
Think a better fix would have been to put AN5 bolts instead of the
pins and to mill a aluminum plug which could slide inside the TP4
torque tube and give you the possibility to tighten the arrangement
together.
I am interested in comments from folks who have done this mod. the
Europa way to hear from their experience.
Regards Gert
OY-GDS / Europa Mono / Kit 151 / 914 / 400 hours
Message 4
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| Subject: | Re: Debugging a TCU Problem |
--> Europa-List message posted by: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
Hi Paul,
>
> About a year ago, every now and then the orange TCU light would flash.
Do you mean, while engine was running ? During cruise, for instance ?
> I'd power cycle and it would go away. Over time it is almost at the
> point that this happens every time. At first I thought it was just
> the waste gate sticking, but after further investigation I realized
> that if the waste was stuck, the servo would move and the cable would
> bow in and out. (Lockwood confirmed this).
Are you sure the servo is so powerful as to overcome any cable binding
or wastegate sticking ?
Have you tried disconnecting the cable at the servo end to observe what
is going on at power on ?
>
> In my case what happens is the the servo just doesn't move. I can
> hear is making the normal "growling" noise, but it doesn't do its
> normal cycle on power up. If I start the engine and power cycle the
> TCU then all is well.
If it growls, then it is trying to do its duty. What prevents it ? Cable
? Wastegate ? Stuck bearings inside ?
By the way, did you install it in the safe environment of the cabin, or
in the engine compartment inferno ? (We chose the cabin for the TCU and
servo).
>
> I asked the Lockwood guys and they think I have a faulty servo. I
> have reseated all of the cables but it didn't make any difference. I
> really don't want to buy a $370 servo just to find out it that its not
> the problem.
>
> The next step is to go buy a servo to prove this theory, but before I
> do I'd be interested in an other ideas.
>
I would first remove it from the airplane, and conduct a close
inspection and some bench tests.
But first, does it work with no cable ?
And what about the TCU connectors cleanliness, condensation, etc...?
BTW, the yellow light (if correctlly wired) might indicate a TCU
malfunction ;-((
Keep us posted,
Best regards,
Gilles Thesee
Grenoble, France
http://contrails.free.fr
Message 5
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| Subject: | Mod. 62 - Replacement of tailplane torque tube drive |
pins
Gert,
I also did the mod last year. Before doing it I asked Andy about the
possibilities of having to do it again and he told me that, so far as he
knew, no one has had to do it twice (although he could be proved
wrong!). Mine have not shown any sign of loosening again since I did
the mod.
Richard Iddon. G-RIXS
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Gert
Dalgaard
Sent: 26 August 2006 16:47
Subject: Europa-List: Mod. 62 - Replacement of tailplane torque tube
drive pins
OK, I have now done the HYPERLINK
"http://www.europa-aircraft.biz/pdfs/modifications/Mod%252062.pdf"Europa
modification No 62!
Amen.
Easy to write, but believe me - a hard job.
I did the fix according to the factory recommendations, but actually I
feel that it's just a matter of time before the problem occurs again.
Think a better fix would have been to put AN5 bolts instead of the pins
and to mill a aluminum plug which could slide inside the TP4 torque tube
and give you the possibility to tighten the arrangement together.
I am interested in comments from folks who have done this mod. the
Europa way to hear from their experience.
Regards Gert
OY-GDS / Europa Mono / Kit 151 / 914 / 400 hours
"http://www.matronics.com/Navigator?Europa-List"http://www.matronics.com
/Navigator?Europa-List
"http://forums.matronics.com"http://forums.matronics.com
"http://www.matronics.com/contribution"http://www.matronics.com/contribu
tion
--
25/08/2006
--
25/08/2006
Message 6
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| Subject: | Re: Debugging a TCU Problem |
--> Europa-List message posted by: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
Paul McAllister a crit :
> Hi all,
>
> I am looking for some ideas on debugging a TCU - Turbo - waste gate issue.
Paul,
By the way, connecting a laptop to your TCU during tests might provide
interesting data.
FWIW,
Best regards,
Gilles
http://contrails.free.fr
Message 7
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| Subject: | Debugging a TCU Problem |
--> Europa-List message posted by: "Paul McAllister" <paul.mcallister@qia.net>
Hi Gilles,
Thanks for your ideas, see my answers to your questions in the txt
____________________________________________
> Do you mean, while engine was running ? During cruise, for instance ?
No, this is when I first turn on the master prior to engine start. I
have never had a problem in flight or after engine start up
>Are you sure the servo is so powerful as to overcome any cable binding
>or wastegate sticking ?
Lockwood Aviation tell me yes. John Hurst (Ex US Manager of Europa)
confirmed this.
>Have you tried disconnecting the cable at the servo end to observe
> what is going on at power on ?
Well, no, but given two independent confirmations I didn't think it was
worth the effort.
Also, this isn't a repeatable problem. It happens with the first
power up, but once it works it says working. So, I could go to all the
trouble to try what you suggest, but it I couldn't conclude any thing
for sure.
>If it growls, then it is trying to do its duty. What prevents it ?
>Cable ? Wastegate ? Stuck bearings inside ?
Well, it has been my observation that is always makes barely audible
"growling" noise when it is its "steady state" condition. It's not
sounding like it is straining.
>By the way, did you install it in the safe environment of the cabin,
>or in the engine compartment inferno ? (We chose the cabin for the TCU
>and servo).
Mine is in the cabin
>I would first remove it from the airplane, and conduct a close
>inspection and some bench tests.
I agree, a close inspection of the unit and the integrity of the crimp
connectors is in order. One theory I have is the feedback pot
on the servo might be faulty, may be the wiper is intermittent and
all it takes is an initial movement and its okay. Perhaps the engine
vibration is enough to do this.
I have inspected all of the cables in the engine compartment.
>BTW, the yellow light (if correctlly wired) might indicate a TCU
>malfunction ;-((
Yes, the cost of a new TCU would make the price of a servo look like
small change. I often think that most of the TCU's functionality
could be replaced by a 7 lb spring on the waste gate !!
Thanks for your input.
Paul
Message 8
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| Subject: | Re: Debugging a TCU Problem |
--> Europa-List message posted by: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
> No, this is when I first turn on the master prior to engine start. I
> have never had a problem in flight or after engine start up
>
Do you confirm the MP always stays within specified limits ? At
take-off, for instance ?
If so, have you considered the "yellow indicator failure" hypothesis ?
>
>
>> Are you sure the servo is so powerful as to overcome any cable binding
>> or wastegate sticking ?
>>
> Lockwood Aviation tell me yes. John Hurst (Ex US Manager of Europa)
> confirmed this.
>
If they did not examine your setup, I would not trust them too much on
that...
What is sure, is that if the wastegate is stuck, the servo won't be
powerful enough. It happened to some pilots I know, and sure enough, the
servo could not overcome the friction.
>
>> Have you tried disconnecting the cable at the servo end to observe
>> what is going on at power on ?
>>
>
> Well, no, but given two independent confirmations I didn't think it was
> worth the effort.
>
> Also, this isn't a repeatable problem. It happens with the first
> power up, but once it works it says working. So, I could go to all the
> trouble to try what you suggest, but it I couldn't conclude any thing
> for sure.
>
>
>
If it were my airplane, I would first make sure it is not the cable or
wasegate.
Disconnecting the cable is no big deal.
> .....
> I agree, a close inspection of the unit and the integrity of the crimp
> connectors is in order. One theory I have is the feedback pot
> on the servo might be faulty, may be the wiper is intermittent and
> all it takes is an initial movement and its okay. Perhaps the engine
> vibration is enough to do this.
Could be, that is if it is the servo...
Best of luck in your troubleshooting,
Best regards,
Gilles
http://contrails.free.fr
Message 9
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Kim,
The rudder was fully functional.
Remi
From: Kim Prout <kpaviat@verizon.net>
Subject: Re: Europa-List: Re: heavy wing
A stuck rudder will induce a heavy roll...did you consider this a
possibility??? Right rudder needed on takeoff will result in right roll
tendency in flight.
kp
Message 10
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| Subject: | Re: Mod. 62 - Replacement of tailplane torque tube drive |
pins
That seems entirely credible given that the original looseness probably
develops as a results of either poor manufacture in the first place
and/or builder-induced looseness as the drive pins are repeatedly
assembled/dissembled during original construction.
But I'm holding my breath too!
Duncan McF.
----- Original Message -----
From: Richard Iddon
To: europa-list@matronics.com
Sent: Saturday, August 26, 2006 5:08 PM
Subject: RE: Europa-List: Mod. 62 - Replacement of tailplane torque
tube drive pins
Gert,
I also did the mod last year. Before doing it I asked Andy about the
possibilities of having to do it again and he told me that, so far as he
knew, no one has had to do it twice (although he could be proved
wrong!). Mine have not shown any sign of loosening again since I did
the mod.
Richard Iddon. G-RIXS
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Gert
Dalgaard
Sent: 26 August 2006 16:47
To: europa-list@matronics.com
Subject: Europa-List: Mod. 62 - Replacement of tailplane torque tube
drive pins
OK, I have now done the Europa modification No 62!
Amen.
Easy to write, but believe me - a hard job.
I did the fix according to the factory recommendations, but actually I
feel that it's just a matter of time before the problem occurs again.
Think a better fix would have been to put AN5 bolts instead of the
pins and to mill a aluminum plug which could slide inside the TP4 torque
tube and give you the possibility to tighten the arrangement together.
I am interested in comments from folks who have done this mod. the
Europa way to hear from their experience.
Regards Gert
OY-GDS / Europa Mono / Kit 151 / 914 / 400 hours
- The Europa-List Email Forum - --> - NEW
MATRONICS WEB FORUMS - --> - NEW MATRONICS LIST WIKI -
--> - List Contribution Web Site - Thank you for your
generous support! -Matt Dralle, List Admin.
-->
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25/08/2006
Message 11
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Anyone know where I can get a gas cap. Don't need a locking cap.
Ken carpenter N 9XS
Message 12
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| Subject: | Re: gas cap for XS |
Hi Ken
I have an extra gas cap.
Please let me know your exact address.
I will send it immediately.
It is free for you.
Please contact privat
raimo.toivio@rwm.fi
Kindest Regards,
Raimo Toivio
=========
Raimo M W Toivio
OH-XRT Europa XS Mono #417, almost completed...will be painted in few
days
OH-CVK C172 Skyhawk, this year more than 100 hrs
OH-BLL Beechcraft C45 w radial engines (grounded so far...)
37500 Lempaala
Finland
tel + 358 3 3753 777
fax + 358 3 3753 100
gsm + 358 40 590 1450
raimo.toivio@rwm.fi
www.rwm.fi
----- Original Message -----
From: ken carpenter
To: europa-list@matronics.com
Sent: Sunday, August 27, 2006 12:01 AM
Subject: Europa-List: gas cap for XS
Anyone know where I can get a gas cap. Don't need a locking cap.
Ken carpenter N 9XS
Message 13
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| Subject: | Re: Mod. 62 - Replacement of tailplane torque tube drive |
pins
--> Europa-List message posted by: <rparigor@suffolk.lib.ny.us>
Hello Gert
"I am interested in comments from folks who have done this mod. the Europa
way to hear from their experience."
YIKES
My kit A-265 came through with 3/8 pins. The holes were trilobal, 2 of the
pins dropped in by hand, the other 2 way too loose.
Andy sent me 3/8" pins .001" oversized. Not even close to resolve.
Next he sent me 10mm reamer and 4 10mm pins. Better but it is a new build
and there was play 1/2 way towards unacceptable. The reamer cut a little
oversized and the pin sizes were not too precise.
That was Factory resolve which would have no way lasted very long. Factory
went out of business shortly there after.
In less than thousands of words, I made a plastic fixture to hold things
solid in my Bridgeport milling machine. Snuck up on holes with a reamer,
then a second one a few thousands over the first. Plenty of cutting fluid.
I then machined a pin out of 416 Stainless Steel. Used precision pins to
measure hole, and hand lapped .0008" oversized. Pretty good but fit was
still not to my liking!
Ends up that although when you ream a hole, you can measure a size, if you
look at it under a microscope, it is not too close to smooth. I then made
a series of pins in .0001" increments. Then I forced them 1 at a time
till I could feel a good amount of resistance. Once you get to this
resistance point, going larger does not change hole size. I will call this
burnishing. After burnishing I measured holes, and made pins oversized.
Not a trivial job making a pin holding tolerance to ~ .0002". Turn just a
little over, then hand lap to precise size. I also lapped the center of
pins a thousand or 2 undersized so the first hole would get minimal
damage.
Absolute no play, and I am pretty certain this is a permanent repair. Pin
size was a little over .400" which was OKed by Andy.
Ron Parigoris
Message 14
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| Subject: | Debugging a TCU Problem |
--> Europa-List message posted by: <rparigor@suffolk.lib.ny.us>
Hello Paul
Will first make a few comments on your problem. After my name will comment
on:
"I often think that most of the TCU's functionality could be replaced by a
7 lb spring on the waste gate !!"
Page 10-24 of the owners manual
10.4.6) Orange caution lamp of TCU blinking
Indicates a failure of a sensor, sensor wiring, TCU, or leakage in the
airbox.
Did you hook up a computer to see if all parameters are within reason? It
sounds like if something is out it will not cycle servo.
Is sounds like the growl you are talking about is the slight fighting the
motor/pot/computer does to take control of the servo. I have no first hand
but have read that noise is pretty common out of servo. If the wastegate
is stuck, since the cable is pushing to open, like you said it will just
bow, the servo is more than strong enough to do that.
My experience on model aeroplane servos with dirty or failed pots, is
often they will jitter, or will not park or stop in the same location. On
some servos if there is no pot feedback, it will allow the servo to drive
beyond the stop and break things.
Hook up a laptop first and make sure all is happy. Make sure that the
switch you are using to power the TCU is not making a high resistance
contact, where it is actual dropping battery voltage to TCU (measure
voltage on turn on at the TCU if you can) and when you pump a little more
voltage when alternator does its magic, the TCU is happy. Long wires
feeding TCU or poor contacts/ground can drop voltage as well. Change
switch or take apart and clean contacts if you can. Red #2 pencil erasers
sliced to fit usual do a great job! Be sure to clean out debris after.
If you think the servo is suspect, and you are not quite comfortable
ripping it apart to try and fix it, I will be glad to do the honors for
you. My experience with model servos is precise cleaning with a little bit
of contact cleaner (with lube) usual resolves. It also allows a very close
inspection of the pot, after a while the pot itself wears out and becomes
unserviceable. Sometimes the shotgun spray without disassembly will work,
not reliable enough for me. Sometimes the pot does in fact develop a dead
spot. I have had fair success adjusting the wiper track to a non worn out
part of resistive disk or slider.
Ron Parigoris
"I often think that most of the TCU's functionality could be replaced by a
7 lb spring on the waste gate !!"
I don't agree a spring on wastegate will give anywhere near as much
control that is needed.
Function of TCU only does 2 tasks. Opens or closes Wastegate, and opens or
closes enrichment solenoid. Bad if one tries and make things simplier than
necessary. There is a reasonable amount of things that need to be in order
for the engine to boost over 100%. When it does the enrichment solenoid
will enrich. TCU processes to allow normal boost, but if some input
happens that is undesirable will open wastegate.
Airbox pressure is measured in absolute terms. To achieve 100% power, more
turbo boost is needed at altitude compared to sea level. If you were to
use a 914 on a airboat, and were willing to accept only 100% power, I
could see using a pneumatic solenoid to actuate the wastegate, where
airbox pressure would feed the solenoid to open the wastegate. If you were
to make such a device with an aneroid you could probably use it in your
plane. It however would allow boost if intake air was too hot, would not
know if turbine had potential of overspeeding (that is what I believe
function is of static air sensor, algorythm measures difference of static
and airbox (and other inputs) and knows when overspeed is likely). TCU may
open wastegate if it senses engine overspeed?
If you wanted to put more burden on pilot, you could probably introduce a
aneroid style blow off valve on the airbox (only Cont. and Lyc. I know of
that make such a thing, and probably too big, and allows too much leak)
that will not allow overboost, and have a pilot controlled wastegate.
Instead of a aneroid style mechanical blow off valve, you could take input
from absolute airbox pressure sender with a little circuit and open a
solenoid to leak out airbox pressure. I was actual toying with the idea of
putting a blow off solenoid in the airbox so in the event the wastegate
stuck closed, you would at least not blow up engine. Solenoid that would
suit bill is not easy to find. I found one that would probably work fine
and filled my requirements, but it is used on the Space Shuttle, lead time
was in years and would cost half as much as a 914. The operator manual
speaks DO178B (10-18) take offs where you turn off TCU with wastegate
closed, and the pilot adjusts throttle for max boost and RPM. Once
critical altitude to clear obstacle, you then turn on TCU. The reason for
this operation is in event of wastegate opening by the TCU at a critical
moment, it may ruin your day. Anyway the reason you don't just leave the
wastegate closed all the time, or for that matter not even have a
wastegate and just let the turbo run full all the time, is when you adjust
manifold pressure with the throttle, yes you may be saving the engine, you
have a severe high airbox pressure that will do good for turbo long life.
Message 15
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| Subject: | Re: Mod. 62 - Replacement of tailplane torque tube drive |
pins
--> Europa-List message posted by: "Mike Parkin" <mikenjulie.parkin@btopenworld.com>
----- Original Message -----
From: <rparigor@suffolk.lib.ny.us>
Sent: Sunday, August 27, 2006 5:14 AM
Subject: Re: Europa-List: Mod. 62 - Replacement of tailplane torque tube
drive pins
> --> Europa-List message posted by: <rparigor@suffolk.lib.ny.us>
>
> Hello Gert
>
> "I am interested in comments from folks who have done this mod. the Europa
> way to hear from their experience."
>
> YIKES
>
> My kit A-265 came through with 3/8 pins. The holes were trilobal, 2 of the
> pins dropped in by hand, the other 2 way too loose.
>
> Andy sent me 3/8" pins .001" oversized. Not even close to resolve.
>
> Next he sent me 10mm reamer and 4 10mm pins. Better but it is a new build
> and there was play 1/2 way towards unacceptable. The reamer cut a little
> oversized and the pin sizes were not too precise.
>
> That was Factory resolve which would have no way lasted very long. Factory
> went out of business shortly there after.
>
> In less than thousands ..................
All this for a couple of pins ??????
Just which century were you planning to fly your aircraft Ron??
regards,
Mike
do not archive
Message 16
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| Subject: | Re: Mod. 62 - Replacement of tailplane torque tube drive |
pins
--> Europa-List message posted by: Gert Dalgaard <lgds@post6.tele.dk>
Hi Ron
Sounds like a god and permanent way to solve that problem!
Regards Gert
Den 27/08/2006 kl. 6.14 skrev <rparigor@suffolk.lib.ny.us>:
> --> Europa-List message posted by: <rparigor@suffolk.lib.ny.us>
>
> Hello Gert
>
> "I am interested in comments from folks who have done this mod. the
> Europa
> way to hear from their experience."
>
> YIKES
>
> My kit A-265 came through with 3/8 pins. The holes were trilobal, 2
> of the
> pins dropped in by hand, the other 2 way too loose.
>
> Andy sent me 3/8" pins .001" oversized. Not even close to resolve.
>
> Next he sent me 10mm reamer and 4 10mm pins. Better but it is a new
> build
> and there was play 1/2 way towards unacceptable. The reamer cut a
> little
> oversized and the pin sizes were not too precise.
>
> That was Factory resolve which would have no way lasted very long.
> Factory
> went out of business shortly there after.
>
> In less than thousands of words, I made a plastic fixture to hold
> things
> solid in my Bridgeport milling machine. Snuck up on holes with a
> reamer,
> then a second one a few thousands over the first. Plenty of cutting
> fluid.
> I then machined a pin out of 416 Stainless Steel. Used precision
> pins to
> measure hole, and hand lapped .0008" oversized. Pretty good but fit
> was
> still not to my liking!
>
> Ends up that although when you ream a hole, you can measure a size,
> if you
> look at it under a microscope, it is not too close to smooth. I
> then made
> a series of pins in .0001" increments. Then I forced them 1 at a time
> till I could feel a good amount of resistance. Once you get to this
> resistance point, going larger does not change hole size. I will
> call this
> burnishing. After burnishing I measured holes, and made pins
> oversized.
> Not a trivial job making a pin holding tolerance to ~ .0002". Turn
> just a
> little over, then hand lap to precise size. I also lapped the
> center of
> pins a thousand or 2 undersized so the first hole would get minimal
> damage.
>
> Absolute no play, and I am pretty certain this is a permanent
> repair. Pin
> size was a little over .400" which was OKed by Andy.
>
> Ron Parigoris
>
>
Message 17
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| Subject: | Re: Mod. 62 - Replacement of tailplane torque tube drive |
pins
--> Europa-List message posted by: "William Mills" <william@wrmills.plus.com>
The other way is to clean the drive sleeve and torque tube surfaces with
acetone and a jet of compressed air, then use a wicking grade Loctite to
bond them together after lining up the tailplane trailing edges. It must be
about 800 to 900 hours since I did that to mine and they are still solid. I
will, of course, have to deal with dismantling if I ever have to, but a heat
source inside the torque tube should do the trick. I also had to provide
some lubricating tubes to replace the oil into the torque tube bearings,
because the acetone washes that out too.
Regards,
William
----- Original Message -----
From: <rparigor@suffolk.lib.ny.us>
Sent: Sunday, August 27, 2006 5:14 AM
Subject: Re: Europa-List: Mod. 62 - Replacement of tailplane torque tube
drive pins
> --> Europa-List message posted by: <rparigor@suffolk.lib.ny.us>
>
> Hello Gert
>
> "I am interested in comments from folks who have done this mod. the Europa
> way to hear from their experience."
>
> YIKES
>
> My kit A-265 came through with 3/8 pins. The holes were trilobal, 2 of the
> pins dropped in by hand, the other 2 way too loose.
>
> Andy sent me 3/8" pins .001" oversized. Not even close to resolve.
>
> Next he sent me 10mm reamer and 4 10mm pins. Better but it is a new build
> and there was play 1/2 way towards unacceptable. The reamer cut a little
> oversized and the pin sizes were not too precise.
>
> That was Factory resolve which would have no way lasted very long. Factory
> went out of business shortly there after.
>
> In less than thousands of words, I made a plastic fixture to hold things
> solid in my Bridgeport milling machine. Snuck up on holes with a reamer,
> then a second one a few thousands over the first. Plenty of cutting fluid.
> I then machined a pin out of 416 Stainless Steel. Used precision pins to
> measure hole, and hand lapped .0008" oversized. Pretty good but fit was
> still not to my liking!
>
> Ends up that although when you ream a hole, you can measure a size, if you
> look at it under a microscope, it is not too close to smooth. I then made
> a series of pins in .0001" increments. Then I forced them 1 at a time
> till I could feel a good amount of resistance. Once you get to this
> resistance point, going larger does not change hole size. I will call this
> burnishing. After burnishing I measured holes, and made pins oversized.
> Not a trivial job making a pin holding tolerance to ~ .0002". Turn just a
> little over, then hand lap to precise size. I also lapped the center of
> pins a thousand or 2 undersized so the first hole would get minimal
> damage.
>
> Absolute no play, and I am pretty certain this is a permanent repair. Pin
> size was a little over .400" which was OKed by Andy.
>
> Ron Parigoris
>
>
> --
>
>
Message 18
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|
| Subject: | Re: Mod. 62 - Replacement of tailplane torque tube drive |
pins
Hi William
That could also be an option though it sounds a little to permanent
for me :-))
Gert
Den 27/08/2006 kl. 8.00 skrev William Mills:
> The other way is to clean the drive sleeve and torque tube surfaces
> with acetone and a jet of compressed air, then use a wicking grade
> Loctite to bond them together after lining up the tailplane
> trailing edges. It must be about 800 to 900 hours since I did that
> to mine and they are still solid. I will, of course, have to deal
> with dismantling if I ever have to, but a heat source inside the
> torque tube should do the trick. I also had to provide some
> lubricating tubes to replace the oil into the torque tube bearings,
> because the acetone washes that out too.
> Regards,
> William
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