another poor man's car engine conversion

On Feb 14, 9:07*am, Karl-Heinz Künzel
wrote:

Under "Bilder" on the left you will see details of the engine.

KH
-----------------------------------------------------------------------------
Note the excellent method used for belt tensioning.

-R.S.Hoover

wrote:
On Feb 14, 9:07 am, Karl-Heinz Künzel
wrote:

Under "Bilder" on the left you will see details of the engine.

KH
-----------------------------------------------------------------------------
Note the excellent method used for belt tensioning.

-R.S.Hoover

I looked for it but didn't see it. Was it an eccentric shaft mount on
the driven wheel? Those planes looked like Fournier RF4s at fist
glance. Yummy!

BrianW

On Feb 14, 2:00*pm, Brian Whatcott wrote:

I looked for it but didn't see it. Was it an eccentric shaft mount on
the driven wheel? * Those planes looked like Fournier RF4s at fist
glance. Yummy!

----------------------------------------------------------------------------------------------

Yes. You can see it in one of the engine photos. The eccentricity
appears to be machined into the shaft. That is, a diameter of about
2" from which the shaft stub projects off-center. This method is
probably the most common, dating back to the Stewart PSRU. But the
problem has always been adequate CLAMPING of the eccentric, which this
PSRU appears to have resolved through the use of TWO clamping plates,
as shown in one of the photos. There's some very good Practical
Engineering here.

-R.S.Hoover

On Feb 14, 6:38*am, jan olieslagers
wrote:
.. But he answers the axle needn't be long, as the engine is only a
2-cylinder.

Any thoughts / ideas / comments / experiences?
TIA,

The "shortness" may not preclude harmonic vibration. Each situation
is unique.
I've never had any hands on with a @CV motor but from what I see he

http://www.youtube.com/watch?v=7mvTWiF6KFM

It looks to me like it would be much easier to put the belt drive and
prop on the flywheel end. Far fewer things to move and/or
modify..........

For some other interesting insights into the Citroen motor for those
like me that don't have a physical one in front of them to examine,
take a look starting at 1:50.

http://www.youtube.com/watch?v=2QTTAzJbL3w

Are there sources for these motors, and/or parts, in the states?
===============================
Leon McAtee

jan olieslagers wrote:
Yesterday I was talking to a friend who plans to power his single-seat
slow flyer with an engine from a Citroen Visa. I suppose this engine (a
linear descendant from the famous Citroen 2CV) is not well known in the
US, it is an air-cooled 2-cylinder boxer, in this particular application
it would produce some 45 HP.

My friend absolotely wants it in the plane as it is in the car, i.e.
with the clutch side rearward (the plane is a traditional "puller"), and
wants to take power from the clutch side. His idea is to have a belt
reduction "behind" the engine, then a transmission axle above the engine
to drive the prop. Now I'm sceptical 'cause I heard all kind of bad
things about transmission axles driving propellers, vibration not the
least. But he answers the axle needn't be long, as the engine is only a
2-cylinder.

Any thoughts / ideas / comments / experiences?
TIA,

A two cylinder air cooled 45HP engine implies heat rejection of some
portion of 70%/30% of 45HP/2, or a fraction of about 53 HP X 746 watts
from EACH cylinder.
39 kilowatts is serious heating, even if the biggest part departs via
the exhaust pipe. One reason why people pay attention to fins and ducts
- or even more, to water-cooling such engines.

BrianW

Found a whole series of rebuild videos. Shade tree mechanicn' isn't
just a US thing. All I can say is that these must be durable little
motors.............

http://www.youtube.com/watch?v=0olqe-jgDiI
======================
Leon McAtee

On Sat, 14 Feb 2009 13:38:56 +0000, jan olieslagers
wrote:

Yesterday I was talking to a friend who plans to power his single-seat
slow flyer with an engine from a Citroen Visa. I suppose this engine (a
linear descendant from the famous Citroen 2CV) is not well known in the
US, it is an air-cooled 2-cylinder boxer, in this particular application
it would produce some 45 HP.

My friend absolotely wants it in the plane as it is in the car, i.e.
with the clutch side rearward (the plane is a traditional "puller"), and
wants to take power from the clutch side. His idea is to have a belt
reduction "behind" the engine, then a transmission axle above the engine
to drive the prop. Now I'm sceptical 'cause I heard all kind of bad
things about transmission axles driving propellers, vibration not the
least. But he answers the axle needn't be long, as the engine is only a
2-cylinder.

Any thoughts / ideas / comments / experiences?
TIA,

if you hunt out the cd on the micro imp (there is a web site) you will
see pictures of molt taylor's effort to use one of these engines to
power the prototype micro imp. he gave up on it after extensive
tinkering failed to achieve anything like the published power figures.
( where have we heard that before :-) :-) )

if this is a much improved version of the motor you may have
success.(you may not)
molt taylor solved the vibration problem using his flexidyne drive
unit. you could make one of these from the drawing details on the cd.
all of his notes and photos of the project right up to his death are
on the cd. it's an interesting browse. almost all the details of his
engineered drive shaft are there in the drawings as well. from memory
some of his calculations are absent.

Stealth Pilot

"Stealth Pilot" wrote in message
...
On Sat, 14 Feb 2009 13:38:56 +0000, jan olieslagers
wrote:

Yesterday I was talking to a friend who plans to power his single-seat
slow flyer with an engine from a Citroen Visa. I suppose this engine (a
linear descendant from the famous Citroen 2CV) is not well known in the
US, it is an air-cooled 2-cylinder boxer, in this particular application
it would produce some 45 HP.

My friend absolotely wants it in the plane as it is in the car, i.e.
with the clutch side rearward (the plane is a traditional "puller"), and
wants to take power from the clutch side. His idea is to have a belt
reduction "behind" the engine, then a transmission axle above the engine
to drive the prop. Now I'm sceptical 'cause I heard all kind of bad
things about transmission axles driving propellers, vibration not the
least. But he answers the axle needn't be long, as the engine is only a
2-cylinder.

Any thoughts / ideas / comments / experiences?
TIA,

if you hunt out the cd on the micro imp (there is a web site) you will
see pictures of molt taylor's effort to use one of these engines to
power the prototype micro imp. he gave up on it after extensive
tinkering failed to achieve anything like the published power figures.
( where have we heard that before :-) :-) )

if this is a much improved version of the motor you may have
success.(you may not)
molt taylor solved the vibration problem using his flexidyne drive
unit. you could make one of these from the drawing details on the cd.
all of his notes and photos of the project right up to his death are
on the cd. it's an interesting browse. almost all the details of his
engineered drive shaft are there in the drawings as well. from memory
some of his calculations are absent.

Stealth Pilot

If you are talking about the Flexidyne coupling, those were and still are
made by Dodge (now Baldor Dodge) which has a web site at:
http://www.dodge-pt.com

The Flexidyne coupling is a soft start device that acts as a centrifugal
clutch, rather than a dampener or soft drive system component; but is
reputed to solve some very low frequency (resonance on starting) problems
and appears to have a wealth of accessories and mounting methods available.
I have no personal experience whatsoever, but I do recall that the units
were a feature of more than one of Molt Taylor's designs--including both the
IMP series and the power pack system that merged a pair on engines to a
single propeller.

Peter

On Sat, 14 Feb 2009 13:38:56 +0000, jan olieslagers wrote:

Yesterday I was talking to a friend who plans to power his single-seat
slow flyer with an engine from a Citroen Visa. I suppose this engine (a
linear descendant from the famous Citroen 2CV) is not well known in the
US, it is an air-cooled 2-cylinder boxer, in this particular application
it would produce some 45 HP.

My friend absolotely wants it in the plane as it is in the car, i.e.
with the clutch side rearward (the plane is a traditional "puller"), and
wants to take power from the clutch side. His idea is to have a belt
reduction "behind" the engine, then a transmission axle above the engine
to drive the prop. Now I'm sceptical 'cause I heard all kind of bad
things about transmission axles driving propellers, vibration not the
least. But he answers the axle needn't be long, as the engine is only a
2-cylinder.

Any thoughts / ideas / comments / experiences?
TIA,

He's a ****ing idiot on his way to die.
--
Bear Bottoms
Private Attorney General