Today's Message Index:
----------------------
1. 12:40 AM - Re: Tail wheel control cables attachment (Mike Parkin)
2. 12:44 AM - Re: Tail wheel control cables attachment (GRAHAM SINGLETON)
3. 01:14 AM - Re: Tail wheel control cables attachment (Robert C Harrison)
4. 02:21 AM - ELT mount for free, anyone? (Frans Veldman)
5. 02:40 AM - Tail wheel control cables attachment (Justin Kennedy)
6. 09:33 AM - Re: Bing Carb Checks ----- FAA investigated fatal accident.. (rampil)
7. 10:47 AM - Re: Re: Bing Carb Checks ----- FAA investigated fatal accident.. (Frans Veldman)
8. 11:50 AM - Re: Bing Carb Checks ----- FAA investigated fatal accident.. (rampil)
9. 12:48 PM - Bing Carb Checks ----- FAA investigated fatal accident.. (Guerner Remi)
10. 01:02 PM - FW: Bing Carb Checks ----- FAA investigated fatal accident.. (Guerner Remi)
11. 01:12 PM - Tail wheel control cables attachment (Guerner Remi)
12. 01:26 PM - Re: Re: Bing Carb Checks ----- FAA investigated fatal accident.. (Frans Veldman)
13. 01:27 PM - TIAS 2010 w Europa (Raimo Toivio)
14. 01:40 PM - Re: FW: Bing Carb Checks ----- FAA investigated fatal accident.. (Frans Veldman)
15. 01:44 PM - Tail wheel control cables attachment (Guerner Remi)
16. 02:09 PM - Re: FW: Bing Carb Checks ----- FAA investigated fatal accident.. (Fred Klein)
17. 02:38 PM - Re: FW: Bing Carb Checks ----- FAA investigated fatal accident.. (Frans Veldman)
18. 03:20 PM - Re: FW: Bing Carb Checks ----- FAA investigated fatal accident.. (GRAHAM SINGLETON)
19. 04:26 PM - Re: Tail wheel control cables attachment (Fred Klein)
20. 04:36 PM - Re: Tail wheel control cables attachment (GRAHAM SINGLETON)
21. 10:20 PM - Re: Tail wheel control cables attachment (rparigoris)
Message 1
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Subject: | Tail wheel control cables attachment |
I used these screw shackles as a replacement. More than enough strength and
not too expensive.
See http://www.s3i.co.uk/rapide_link_standard.php
Regards,
Mike
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Subject: | Re: Tail wheel control cables attachment |
Bob's right. This has been a common problem over the years. Use the AN115
=0Ashackles.=0AGraham=0A=0A=0A=0A=0A________________________________=0AFrom
: Robert Borger <rlborger@mac.com>=0ATo: europa-list@matronics.com=0ASent:
Sunday, 12 September, 2010 23:58:21=0ASubject: Re: Europa-List: Tail wheel
rger <rlborger@mac.com>=0A=0ARemi,=0A=0ALoose the clips! Replace them with
AN115 Cable Shackles, Clevis Pins and a =0ACotter Pins (split pin).=0A=0Ah
ttp://www.aircraftspruce.com/catalog/appages/an115.php=0Ahttp://www.aircraf
tspruce.com/catalog/hapages/clevispins.php=0Ahttp://www.aircraftspruce.com/
catalog/hapages/cotterpins.php=0A=0ACheck six,=0ABob Borger=0Ahttp://www.eu
ropaowners.org/N914XL=0AEuropa XS, Short Wing, Intercooled Rotax 914=0Arlbo
rger@mac.com=0ACel: 817-992-1117=0A=0A=0A=0A=0AOn Sep 12, 2010, at 12:18 PM
, Guerner Remi wrote:=0A=0A> Hi all monowheel drivers,=0A> =0A> After landi
ng on a mountain strip today I noticed I had some trouble =0A>controlling t
he aircraft on roll out and tight turning on the parking. The next =0A>lan
ding on another altiport was uneventful but again I had trouble tight turni
ng =0A>to the parking spot.=0A> During the preflight check for the return f
light, this is what I found: the =0A>starboard ring attaching the cable of
the tailwheel fork was open and was barely =0A>insuring a very loose conne
ction. See attached picture.=0A> I am afraid that if that ring had become f
ully disconnected, I would have =0A>crashed into the wall of rocks on the l
eft side of that runway!=0A> Lesson learned: check that tailwheel control c
ables carefully before EVERY =0A>takeoff.=0A> Of course I am thinking at so
me solution to insure a safer connection of those =0A>cables.=0A> =0A> Remi
=======
Message 3
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Subject: | Tail wheel control cables attachment |
Hi! Mike ....we will miss you
Regards
Bob H
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Mike Parkin
Sent: 13 September 2010 08:37
Subject: RE: Europa-List: Tail wheel control cables attachment
<mikenjulie.parkin@btinternet.com>
I used these screw shackles as a replacement. More than enough strength and
not too expensive.
See http://www.s3i.co.uk/rapide_link_standard.php
Regards,
Mike
Message 4
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Subject: | ELT mount for free, anyone? |
I just replaced my ELT by a PLB, now this is allowed in the Netherlands.
(PM me if you want to know more, only one specific brand of PLB is
acceptable as an ELT replacement).
The ELT mount I took out is available if anyone is interested.
The mount was made for an Artex ME406 (but any other ELT will fit), it
is an aluminium construction that fits just behind the D-panel on the
starboard side, so the ELT is level with the D-opening for easy access.
The mount carries also the antenna, and the mount itself is tuned as a
ground plane for the antenna. It is light weight but designed to
withstand at least a survivable crash.
It has two horizontal legs in a V which are attached against the rear of
the D-panel, one vertical support leg to the floor, and one long
perforated strip reaching about 3 feet into the tail, for taking up
decelleration forces and its length is carefully tuned so it acts as a
ground plane radial for the antenna at the same time.
Available for free.
I can take it with me to the Texel fly in, but I'm also willing to ship
it if you care for the shipping costs.
If no-one is interested I will bore out the anchor nuts and scrap the rest.
Frans
Message 5
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Subject: | Tail wheel control cables attachment |
Hi Guys,
Just a wee note on the Single carb operation. I have a 912S in my monowheel
and had an experience which may shed a little light in this.
I was opening up to take off after a successful run up check and the engine
would only give me 4000 RPM instead of the minimum of 5500 RPM I was expec
ting. It also sounded a bit rough.
I aborted the take off and started the search for the problem. To cut a lon
g story short a crescent shaped piece of rubber from fuel hose about 4 mm l
ong had blocked the port carburettor main jet completely.
I removed the main jet and tried to pass fuel through it and it was complet
ely blocked.
Thus I can say that a Rotax 912s will give 4000 rpm on the starboard carb o
nly. I am sure it was not doing the engine much good and but I guess it wo
uld have provided enough power to get me out of trouble.
Good to see so many of you at Sywell.
Safe flying
Justin
Justin Kennedy
G-ZTED Europa Clasic Monowhell Rotax 912s Airmaster prop with Warp Drive bl
ades.
Message 6
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Subject: | Re: Bing Carb Checks ----- FAA investigated fatal accident.. |
Hi Frans,
I looked at that referenced Italian site for FlyGas.
They gave no indication that their mod had been operationally tested
in any way as of this data (Sep 13, 2010)
Their cross tube looks to be about an inch +/- in diameter. At about
a foot long, my back of napkin estimate is that there would be quite
a pressure drop across that tube at WOT, causing an imbalance in
MP across the engine. Looks doubtful to reduce carb imbalance
vibration on that basis, but will likely cause an RPM related imbalance
of its own which would not be adjustable.
Before we jump on another bandwagon lets see some actual operational
data, preferably with an accelerometer quantifying vibration.
Cheers,
Ira
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=312294#312294
Message 7
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Subject: | Re: Bing Carb Checks ----- FAA investigated fatal accident.. |
On 09/13/2010 06:30 PM, rampil wrote:
> Their cross tube looks to be about an inch +/- in diameter. At about
> a foot long, my back of napkin estimate is that there would be quite
> a pressure drop across that tube at WOT,
Pressure drop? Both halves of the engine carry the same manifold
pressure. If there is no inbalance, the air inside the cross tube is
more or less static, although it will cancel out the intake pulses, so
the air will be thrown left and right but never actually leave the tube.
This is a good thing by itself, because it will soften the intake
pulses. This will even out the mixture between the front and rear cylinder.
Let me explain this further: I guess everyone knows that the front
cylinders of a Rotax get a different mixture than the rear cylinders.
Some people think it has something to do with the distance to the carbs.
Wrong. The reason is that the Rotax fires two cylinders at each side,
and then fires the cylinders on the other side. So at each engine halve,
you will find two intake cycles, and then nothing for a while (during
this time the other cylinders on the opposite engine half have their
intake cycles.
This means that the airflow in one carb has to accelerate at the first
intake cycle, and when that intake valve closes, the other cylinder has
its intake cycle. This cylinder benefits from the air already at speed
through the carb. All this has to do with inertia. For the first
cylinder, apart from the fact that is has the task to accelerate the
mixture after it came to a halt during the pause, the acceleration of
the fuel is lower than the acceleration of the air. So the first
cylinder at each engine halve gets a leaner mixture than the one that is
to fire just after it.
So, the idea of a balance tube is to keep the air up to speed, because
both engine halves have the same problem, but at alternating moments.
Balance tubes are common things in cars, both for the intake as well as
for the exhaust. But usually they have a much larger diameter.
But all this has nothing to do with carb imbalances, this is just an
additional advantage. So, let's go back to the claim that this larger
cross tube makes imbalances less obvious:
> Looks doubtful to reduce carb imbalance
> vibration on that basis,
Never took the small balance tube away (for pneumatic carb balancing)?
Without the tube, imbalances become more obvious. Put the tube in, and
some of the imbalance is gone, because the tube allows some of the
mixture from the higher manifold pressure side to flow to the lower
manifold pressure side. Put even more tube in (i.e. a larger diameter)
and more mixture can flow through it, making the difference in MAP
between both halves even less, and thus lessening the imbalance.
> Before we jump on another bandwagon lets see some actual operational
> data, preferably with an accelerometer quantifying vibration.
Fine, if there is such data. If there isn't, we'll have to revert to
basic physics and engine knowledge.
I might install a larger cross tube some day (not for the cross tube
actually, but for the option to fit fuel injectors), and I will let you
know what I find.
Frans
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Subject: | Re: Bing Carb Checks ----- FAA investigated fatal accident.. |
Hi Frans,
I mentioned the cross tube since you had mentioned the failure of a carb
and that both sides could be fed through the single carb and the"fat"
cross tube. Outside that scenario, there should normally be little flow
and resistive drop.
I am not sure what a cross tube does to "soften" the incoming air pulses.
The flow rate is mainly determined by the linear speed profile and the
fixed surface area of the downgoing piston with the major flow restriction
at the intake valve orifice. The extra compliance of the cross tube is
probably only a small increment to the supply through the carb unless
the butterfly is nearly closed.
Sadly there is no public detailed spec on the Rotax 9xx series, but I do
try to relate its operation from what I learned from Charles Taylor, John Heywood,
and Will Pulkrabek's books.
For most pilots wanting to learn a bit more about their engines (I.e.,
Lycosaurus types), John Schwaner's Engineering Manual is great! Full
of easy to read facts, not conjecture or rumor from a very experienced A&P. (www.sacskyranch.com)
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=312300#312300
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Subject: | Bing Carb Checks ----- FAA investigated fatal accident.. |
Thank you Jerry, that is nice to know!
Remi
<<<<< and the engine
ran very rough but I kept enough power and kept it running to get it
safely
to an airport. That's one of the reasons I love that engine it kept on
going
with one carb, basically half an engine. >>>>
Message 10
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Subject: | FW: Bing Carb Checks ----- FAA investigated fatal accident.. |
Hi Frans,
Looks like an interesting modification. But I am wondering if there
is any inconvenience with this system. If not, why did Rotax design
the engine manifolds with a small balance tube?
Remi
<<<<There is a solution to that:
http://www.flygas.info/en/kit-intake-manifold.html
This set replaces the balance tube between the carbs by a much larger
balance tube, so each carb can feed both halves of the engine. It also
doesn't matter much anymore if your carbs are balanced or not, you can
just loose a carb and the engine keeps running on 4 cylinders.>>>>>>>
Message 11
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Subject: | Tail wheel control cables attachment |
Thanks to those who have made suggestions for the replacement of the
clips. I like the Shackles + Clevis Pins solution.
Attached are two pictures of my temporary fix.
Regards
Remi
Message 12
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Subject: | Re: Bing Carb Checks ----- FAA investigated fatal accident.. |
On 09/13/2010 08:47 PM, rampil wrote:
> I am not sure what a cross tube does to "soften" the incoming air pulses.
Ok, I will try to explain some more.
The firing order of the Rotax is 1-4-2-3. The intake order is of course
similar.
Now, let's see what happens.
For ease of explanation, we will start with cylinder 4. The order we
will follow is thus 4-2-3-1.
Intake of #4 opens. Air starts to accelerate through the carb.
At the moment #4 closes, intake #2 opens. This cylinder is on the same
carb as #4. The air is already up to speed through the carb, it only has
to take the next exit.
Intake #2 closes. As on this side of the engine there are no more
intakes, and we now have to wait for the two cylinders on the other side
of the engine to complete their intake cycle, the air comes to a
screaching halt. There is nowhere to go for the air, all intakes on this
side are closed!
At the same time #2 closes, intake #3 opens. This one is on the other
carb. The air has been come to a stop there, because while the engine
was working on #4 and #2, this carb had no throughput at all. So intake
#3 has the task to start accelerating the air. When #3 closes, #1 opens,
same bank, so the air can just go through. And when #1 closes, this bank
is done, air comes to a stop, and we switch over to intake #4. The whole
cycle repeats itself here.
Ok, now with the balance tube. This will fit in between previous paragraphs.
At the moment intake #2 closes, there are no open intakes on that side
anymore. The air however is at speed, and due to inertia the air wants
to keep going. (keep in mind that the engine runs at 5000 rpm, and at
this speed, inertia of the gasses plays a significant role). Luckily
there is a balance tube, and the air still rushing through the carb
(remember, there is a whole column of air up to speed from the airbox
that doesn't know that intake #2 just closed) takes the only exit
remaining: the balance tube.
At the moment intake #2 closed, intake #3 opens. This one is at the
other side. Luckily, there is just a bunch of air arriving through the
balance tube! This air fills up the gap, at the moment the air through
the carb of #3 has to start moving. Of course the flow through the
balance tube doesn't last very long, but at the moment it ceases, the
column of air through its own carb has just accelerated enough to take over.
This is of course a simplified explanation, you'd better think of all
this as pressure waves. To complicate things further, the column of air
rushing in that finds all doors shut, bounces back. This backwards
pressure wave interferes a moment later with the start of a new inlet cycle.
So, this is what a balance tube is for. Maintaning a smooth air stream
is more efficient and is easier on the carbs. Usually this translates in
more power, and a more even distribution of density and mixture.
Unfortunately, the balance tube of the Rotax is very small, and probably
doesn't do much at WOT.
Frans
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Subject: | TIAS 2010 w Europa |
Hi
We had a nice airshow (Tampere International Airshow) 14-15th 2010 of
August here in Tampere EFTP.
Check
http://www.tampereairshow.fi/en/start
During that wonderful sunny weekend there were 30.000 visitors.
Most loved were Midnight Hawks (4x Bae Hawks with very tight formation
by Finnish Airforce) and F-16 Solo Team (by Royal Netherlands Airforce).
Of course Mustang was great as usually (unfortunately pilot Bertil
Gerhardt got killed in a crash in Norway just a week after the show) as
was Closter Gauntlet (only one in the world) and Fouga Magister with
DC3.
Our tent - The Europa hangar - is beside the main ground exhibition
area. Europa OH-XRT was pulled out and there was a sign which told My
Europa=B4s story. Me or some of my friend was always there trying to
give answers for thousands of questions people made during that show.
***
Some of you may remember: I got married just 10 years ago 15th of August
2000.
I had just finalized my rudder and tailplanes and got a wonderful wife
to help me to build the rest of the plane.
Rest is history: we got two daughters and a flying plane.
When the Airshow was almost finalized our 10th Wedding Days were
started!
That was a wonderful time...much of good friends and relatives, tasty
food and cool drinks and some show time also.
We got some "surprise visitors" like Finnish Airforce with around 30
pilots.
Their present was a VERY low by pass performed by a new Casa 295-M
transport plane and an invite to their base in EFKA.
Also RNLAF visited us - look at the attached pic and also
http://www.f16demoteam.nl/F16/image/news2010/fin2010-001.jpg
Those boys really liked our Samba Girls!
It was a magic way to have a family festival surrounded all that avion
theme.
Terveisin, Raimo Toivio
Europa XS Mono OH-XRT #417 +180 hrs
37500 Lemp=E4=E4l=E4
FINLAND
p +358-3-3753 777
f +358-3-3753 100
toivio@fly.to
www.rwm.fi
Message 14
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Subject: | Re: FW: Bing Carb Checks ----- FAA investigated fatal accident.. |
On 09/13/2010 09:55 PM, Guerner Remi wrote:
> Looks like an interesting modification. But I am wondering if there is
> any inconvenience with this system. If not, why did Rotax design the
> engine manifolds with a small balance tube?
Looks like a question that fits into the same category as some other
questions:
1) Why is the carb attached to a flange that often ruptures and we have
to inspect regularly? Why don't they fix it? On how many cars do the
carbs once in a while just fall off?
2) Why did Rotax not install a carb heater on the 912?
3) Why does Rotax still sell a voltage regulator which is not up to its
task?
4) Why is the TCU data cable a RS232 and not an USB, and do I have to
find a DOS computer to read out the engine parameters? Why can't they
write a decent program for their clients who pay a lot of money for this
engine?
5) Why did Rotax not install a billet pump on the 914, and forces us to
rely on two electrical fuel pumps instead?
6) Why do I need to manually disconnect the wastegate servo in case the
system starts surging, and is the TCU unable to recognize and solve the
problem on its own? How many cars exhibit this behaviour?
Etc.
Of course, Rotax may have had a reason for this one. But then again,
they might have not.
The whole balance tube looks as an afterthought, something they came up
with after the design was ready and the molds for the intake manifold
where already done. So there we have it, way too small, floating in the
air, and it gave them a good opportunity to attach two springs to it to
prevent the carb from falling off when the famous flange ruptures.
Who knows?
Frans
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Subject: | Tail wheel control cables attachment |
Hi Ron,
Thank you for your suggestions. However, having no tail wheel stop is
not good. While pushing your aircraft backwards, the tailwheel will
turn 180 degrees or more and your rigid turnbuckles will be
dangerously damaged. Same thing may happen when landing in a crosswind
with the rudder (and therefore the tailwheel) deflected. When
contacting the ground, the tailwheel is violently pushed to the
opposite position and again your turnbuckle may be damaged . The
Singleton stop is a lot better than the original XS stop (a rolled pin
which breaks after a few dozens landings), but as I saw several
Singleton stops damaged by the beating they take, I designed a
stronger copy (see attached picture).
Regards
Remi
<<<<**I ripped off Grahams aluminium tailwheel stop
**I incorporated turnbuckles on tailwheel drive, one side with an eye
and the other
with a clevis>>>>>>>
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Subject: | Re: FW: Bing Carb Checks ----- FAA investigated fatal accident.. |
On Sep 13, 2010, at 1:36 PM, Frans Veldman wrote:
> 1) Why is the carb attached to a flange that often ruptures and we
> have
> to inspect regularly? Why don't they fix it? On how many cars do the
> carbs once in a while just fall off?
> 2) Why did Rotax not install a carb heater on the 912?
> 3) Why does Rotax still sell a voltage regulator which is not up to
> its
> task?
> 4) Why is the TCU data cable a RS232 and not an USB, and do I have to
> find a DOS computer to read out the engine parameters? Why can't they
> write a decent program for their clients who pay a lot of money for
> this
> engine?
> 5) Why did Rotax not install a billet pump on the 914, and forces us
> to
> rely on two electrical fuel pumps instead?
> 6) Why do I need to manually disconnect the wastegate servo in case
> the
> system starts surging, and is the TCU unable to recognize and solve
> the
> problem on its own? How many cars exhibit this behaviour?
>
> Etc.
Frans...All excellent questions...
>> On how many cars do the carbs once in a while just fall off?
...I'll just bite my tongue and resist further comment...afterall, I'm
still building...
Fred
do not archive
Message 17
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Subject: | Re: FW: Bing Carb Checks ----- FAA investigated fatal accident.. |
On 09/13/2010 11:03 PM, Fred Klein wrote:
>>> On how many cars do the carbs once in a while just fall off?
>
> ...I'll just bite my tongue and resist further comment...afterall, I'm
> still building...
Don't get me wrong. I'm happy with my Rotax 914. It is a nice and
reliable engine. But it doesn't mean that it is perfect, or that nothing
can be improved upon.
I think there is a lack of competition here. Why should they improve it?
It sells anyway.
Do they actually still have a development department? Or have they left
years ago because they harvested enough money? Is that why there is no
EFI version of the 914, no Windows version of the TCU-program, etc?
Frans
Message 18
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Subject: | Re: FW: Bing Carb Checks ----- FAA investigated fatal accident.. |
Fred=0AI have to smile, why indeed. Why did they not have a proper breather
on the =0Acoolant collector bottle. If they had I might not have got a bla
ck eye and some =0Abroken bones.=0AWe must keep on learning and sharing inf
ormation.=0AGraham=0A=0A=0A=0A=0A________________________________=0AFrom: F
red Klein <fklein@orcasonline.com>=0ATo: europa-list@matronics.com=0ASent:
Monday, 13 September, 2010 22:03:43=0ASubject: Re: Europa-List: FW: Bing Ca
rb Checks ----- FAA investigated fatal =0Aaccident..=0A=0A--> Europa-List
message posted by: Fred Klein <fklein@orcasonline.com>=0A=0A=0A=0A=0AFrans.
..All excellent questions...=0A=0A>> On how many cars do the carbs once in
a while just fall off?=0A=0A...I'll just bite my tongue and resist further
comment...afterall, I'm still =0Abuilding...=0A=0AFred
Message 19
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Subject: | Re: Tail wheel control cables attachment |
On Sep 13, 2010, at 1:39 PM, Guerner Remi wrote:
> Thank you for your suggestions. However, having no tail wheel stop
> is not good.
> <<<<**I ripped off Grahams aluminium tailwheel stop
Remi,
Bob may have been using the colloquial phrase "ripped off" to mean
that he copied Graham's design rather than that he removed it.
Fred
Message 20
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Subject: | Re: Tail wheel control cables attachment |
I consider copying to be a form of flattery =0AGraham=0A=0A=0A=0A=0A_______
_________________________=0A=0A=0ARemi,=0A=0ABob may have been using the co
lloquial phrase "ripped off" to mean that he =0Acopied Graham's design rath
er than that he removed it.=0A=0AFred=0A=0A=0A_=0A
Message 21
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Subject: | Re: Tail wheel control cables attachment |
Hi Remi
When I mentioned I "ripped off" Grahams designed of his tailwheel stop, I meant
that I copied his design.
I did in fact fabricate it from 7075 Aluminium that is quite robust.
http://www.mcmaster.com/#about-aluminum/=8u6cpz
http://www.europaowners.org/forums/gallery2.php?g2_itemId=28015
http://www.europaowners.org/forums/gallery2.php?g2_itemId=28009
What material did you make your stop from?
Ron Parigoris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=312370#312370
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