36HP VW Engine

On Thu, 23 Oct 2003 15:11:37 GMT, Peter Dohm
wrote:

These engines were used, I assume with some success, in aircraft such
as the Jodel D9; and were claimed, by the aircraft plans provider, to
produce roughly 24 or 25 horsepower at typical aircraft engine rotational
speeds.


The Jodel had an empty weight just over 300 pounds, gross weight of about
500 pounds, and supposedly cruised around 60 statute miles per hour with
a takeoff run of less than 250 feet and obstacle clearance distance of less
than 500 feet. Little has been heard of the D9 or similar aircraft since
ultra lights ceased to be foot-launched.

Please be aware that the VW engines of 1200 cc and less displacement, and
probably the 1300 cc engine as well, had a serious oil pressure problem
in long term service. The camshaft of these early engines rode directly
in the crankcase halves without bearing liners. As wear occurred, some
mechanics attempted to have the mating surfaces of the case halves milled
and the complete case line-bored. The process was only partially effective
and it was generally impossible to fully restore oil pressure to these
engines on any long term basis.

Not only that, those cases are Magnesium, and they deteriorate
significantly with age. They harden, granulate, and crack.
Either start with a later model magnesium case (still risky) or get a
new aluminum universal replacement case and go from there.

Please also remember that VW engines from relatively new cars with only a
few thousand miles of use were dirt cheap in wrecking yards and that new
engines were available at very reasonable prices from every VW dealer in
both the US and France (were the D9 was designed) when these aircraft were
designed and for about two decades after that.

Another aircraft using similar power was the Stewart Headwind. Mr. Stewart
is still in business selling plans for his designs and has a web site at
http://www.StewartAircraft.com/main.html

Personally, I agree with BD5ER and JFLEISC that you should treat the 36hp
engine as having primarily antique value and choose something else to
power your project.

Peter

Claton Cadmus wrote:

I have a 1959 36HP VW engine and would like information and opinions
on converting this for use in a small single place homebuilt. Also
can anyone tell me or point me to a source of this engines HP and,
more importantly, torque vs RPM curve.

Thanks Claton

Also, the 36 HP VW engine as well as the earlier 25 HP had the generator
town cast into the case as well, You can't just unbolt it like you could on
the 40 HP 1200cc and later.

clare, @, snyder.on, .ca wrote:

On Thu, 23 Oct 2003 15:11:37 GMT, Peter Dohm
wrote:

These engines were used, I assume with some success, in aircraft such
as the Jodel D9; and were claimed, by the aircraft plans provider, to
produce roughly 24 or 25 horsepower at typical aircraft engine rotational
speeds.


The Jodel had an empty weight just over 300 pounds, gross weight of about
500 pounds, and supposedly cruised around 60 statute miles per hour with
a takeoff run of less than 250 feet and obstacle clearance distance of less
than 500 feet. Little has been heard of the D9 or similar aircraft since
ultra lights ceased to be foot-launched.

Please be aware that the VW engines of 1200 cc and less displacement, and
probably the 1300 cc engine as well, had a serious oil pressure problem
in long term service. The camshaft of these early engines rode directly
in the crankcase halves without bearing liners. As wear occurred, some
mechanics attempted to have the mating surfaces of the case halves milled
and the complete case line-bored. The process was only partially effective
and it was generally impossible to fully restore oil pressure to these
engines on any long term basis.

Not only that, those cases are Magnesium, and they deteriorate
significantly with age. They harden, granulate, and crack.
Either start with a later model magnesium case (still risky) or get a
new aluminum universal replacement case and go from there.

Excellent point. I had forgotten that replacement cases might be available.
Who makes them, and who distributes them. Also do you know of a source for
new replacement cases and heads for the Corvair?

Please also remember that VW engines from relatively new cars with only a
few thousand miles of use were dirt cheap in wrecking yards and that new
engines were available at very reasonable prices from every VW dealer in
both the US and France (were the D9 was designed) when these aircraft were
designed and for about two decades after that.

Another aircraft using similar power was the Stewart Headwind. Mr. Stewart
is still in business selling plans for his designs and has a web site at
http://www.StewartAircraft.com/main.html

Personally, I agree with BD5ER and JFLEISC that you should treat the 36hp
engine as having primarily antique value and choose something else to
power your project.

Peter

Claton Cadmus wrote:

I have a 1959 36HP VW engine and would like information and opinions
on converting this for use in a small single place homebuilt. Also
can anyone tell me or point me to a source of this engines HP and,
more importantly, torque vs RPM curve.

Thanks Claton


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