Looking for a sub-100hp engine with long TBO time.

"Anthony W" wrote in message
news:gQPcf.7191$vC6.670@trnddc05...
Check out the Honda four stroke personal watercraft engines. They're
powerful and designed to run at full load for extended lengths of time.
However, you'd have to use a reduction unit to get the RPM down low
enough to drive a prop.

I think I am correct in saying that others have tried using a boat type
powerplant before, and have found problems, especially with keeping them
cool.

With a closed loop (most engines not on the water) water cooled engine, the
engine sees cooling water at a pretty low temperature. They usually have
unregulated flow, and unlimited water, so the cooling passages don't have to
be very large, or move the water very fast to be effective in keeping the
engine cool. Closed loop systems see water coming in at around 180 degrees,
so the flow has to pass through quickly and soak up as much heat as they
can, but are not able to take on much more heat. (because of it's already
high temperature) The passages have to be larger, and contact more of the
hot parts to remove enough heat to keep the engine cool.
--
Jim in NC

"Vaughn" wrote

Beemer? http://www.microlightsport.co.uk/Cat.../bmwengine.htm I
have
spent thousands of hours riding on top of my BMW engine, and often thought
that
I wouldn't mind flying behind one. That said, they have never been
terribly
popular with homebuilders for some reason.

Partially because the engine and transmission share a case, so it makes them
heavy. That said, some are being used.
--
Jim in NC

Maybe this?

http://www.hexatronengineering.com/prod02.htm

David


"tffy" wrote in message
oups.com...
This is for a hypothetical ultralight design, so just looking for
suggestions here of where to look at... hopefully a 4-stroke, purchase
price doesn't matter much, certification status doesn't matter either.
Long time before overhaul matters A LOT... so, the longer the better.
Is there anything out there in the 80-hp range? How about a motorcycle
engine conversion - how long can those go before needing to be
overhauled?

Thanks!

dje wrote:
Maybe this?

http://www.hexatronengineering.com/prod02.htm

Looks great on paper--really great. The website hasn't been updated in
a long time though, not exactly confidence inspiring. Click on "News
Briefs & Articles" and you get:



Web Changes

March 2001:

We are slowly making changes to our site that will allow for uniformity
and clarity.




Recent Media Coverage
EAA Oshkosh 2000 Coverage
Copperstate 2000 Fly-In
2001 Sun 'N Fun

Jim Carriere wrote:

dje wrote:
Maybe this?

http://www.hexatronengineering.com/prod02.htm

Looks great on paper--really great. The website hasn't been updated in
a long time though, not exactly confidence inspiring. Click on "News
Briefs & Articles" and you get:






http://www.ultralightflyer.com/airve...ft_engine.html

This is a reference of them having it at Airventure 2005

tffy a écrit :
This is for a hypothetical ultralight design, so just looking for
suggestions here of where to look at... hopefully a 4-stroke, purchase
price doesn't matter much, certification status doesn't matter either.
Long time before overhaul matters A LOT... so, the longer the better.
Is there anything out there in the 80-hp range? How about a motorcycle
engine conversion - how long can those go before needing to be
overhauled?

Thanks!


Hi,

In the 80 hp 4-stroke range, you'll find only the Jabiru 2200 and the
Rotax 912. Only those engines do have demonstrated in-flight reliability
and substantial TBOs.
Others engines CAN be installed, but be prepared to spend LOTS of time
sorting out cooling and installation problems.
It takes many test-cell and flight-test hours to make a reliable engine
out of a prototype.
And many many engine overhauls to ensure an acceptable TBO.
Besides, most road vehicle or boat engines are heavy. Remembers road
engines are designed to run at relatively low engine power settings,
with the occasional short burst at full power.

On the other hand, aero engines spend their operational life running at
60-75 % power.

My two cents,
Regards,
Gilles Thesee
Grenoble, France
http://contrails.free.fr

tffy wrote:

This is for a hypothetical ultralight design, so just looking for
suggestions here of where to look at... hopefully a 4-stroke,

http://www.rotaryengines.ca/main/about.htm

http://www.rotaryengines.ca/main/aircraft.htm


Is these guys deliver any engine?


by
--
Pub: http://www.slowfood.fr/france
Philippe Vessaire Ò¿Ó¬

I think the Yamaha engines are the same that are in snowmobiles. The snow
version would be closed loop.
Jerry

"Morgans" wrote in message
...

"Anthony W" wrote in message
news:gQPcf.7191$vC6.670@trnddc05...
Check out the Honda four stroke personal watercraft engines. They're
powerful and designed to run at full load for extended lengths of time.
However, you'd have to use a reduction unit to get the RPM down low
enough to drive a prop.

I think I am correct in saying that others have tried using a boat type
powerplant before, and have found problems, especially with keeping them
cool.

With a closed loop (most engines not on the water) water cooled engine,
the
engine sees cooling water at a pretty low temperature. They usually have
unregulated flow, and unlimited water, so the cooling passages don't have
to
be very large, or move the water very fast to be effective in keeping the
engine cool. Closed loop systems see water coming in at around 180
degrees,
so the flow has to pass through quickly and soak up as much heat as they
can, but are not able to take on much more heat. (because of it's already
high temperature) The passages have to be larger, and contact more of the
hot parts to remove enough heat to keep the engine cool.
--
Jim in NC

HKS, 4 stroke, 2 cyclinder, 60 HP.
Jerry
"tffy" wrote in message
oups.com...
Thanks! There isn't anything 2-cylinder available in this power range
(or perhaps less, all the way down to 60hp), is there? The a/c
performance can afford to be somewhat anemic, while mounting space is
at a premium.

You can try Honda CX500 engine, V-shaped, 2 cylinder, foure stroke water
cooled, less then 100hp. This engine was used in Honda CX 500 motor cycle. A
turbo charged engine is also available. Dirt cheap price and available on
ebay for even less then $100-200.

Here is the link for ebay if you are interested to see this engine:

http://cgi.ebay.com/ebaymotors/1980-...QQcmdZViewItem


"tffy" wrote in message
oups.com...
Thanks! There isn't anything 2-cylinder available in this power range
(or perhaps less, all the way down to 60hp), is there? The a/c
performance can afford to be somewhat anemic, while mounting space is
at a premium.