Rotax RPMs

On Thu, 29 Nov 2007 21:47:23 +0000 (UTC), (Paul
Tomblin) wrote:

In a previous article, said:
A quick Google search yielded this info on the engine used in the
Remos:

http://www.rotaxservice.com/rotax_en...ax_912ULSs.htm

Ok, I'm a little embarassed that I couldn't find that info myself.

Is a reduction gearbox seen as a reliability problem, or isn't that such a
big deal any more?

I've run some accident analyses of homebuilts using alternate engines. Out of
~95 homebuilts with Rotax four-strokes that had accidents during 1998-2004,
about 14% of them were due to some sort of mechanical problem with the
powerplant. None of them were due to failures of the gearbox.

BTW, that 14% is about the same as conventional engines....

Ron Wanttaja

I haven't flown one, so I can't be certain, but I'm guessing it would at
least seriously hamper the engines ability to windmill during a temporary
fuel starvation, or carb ice situation.

I've never thought of that.

Does anyone with Rotax flight experience know the answer to that?

"Bertie the Bunyip" wrote in message
.. .
Phil wrote in
:

On Nov 29, 3:47 pm, (Paul Tomblin) wrote:
In a previous article, said:

A quick Google search yielded this info on the engine used in the
Remos:

http://www.rotaxservice.com/rotax_en...ax_912ULSs.htm

Ok, I'm a little embarassed that I couldn't find that info myself.

Is a reduction gearbox seen as a reliability problem, or isn't that
such a big deal any more?

--
Paul Tomblin http://blog.xcski.com/
"Oh my G'Quan, they killed Koshi!" - Citizen G'kyle, Babylon Park

I don't think anyone really knows the reliability of this engine and
gearbox. It hasn't been in service long enough.

It's been around almost twenty years now!


Bertie

Yeah, but other than that 20 year history, there is very little data. ;-)

KB

wrote:
I haven't flown one, so I can't be certain, but I'm guessing it would at
least seriously hamper the engines ability to windmill during a temporary
fuel starvation, or carb ice situation.


I've never thought of that.

Does anyone with Rotax flight experience know the answer to that?

We had the engine stop during a power-off
stall. The idle was set too low. It didn't
start turning again until we started it.

I don't know what would happen at 120 knots,
but I wouldn't count on it windmilling.

Why do you want it to windmill? there is no vacuum system.
wrote in message
...
I haven't flown one, so I can't be certain, but I'm guessing it would at
least seriously hamper the engines ability to windmill during a temporary
fuel starvation, or carb ice situation.

I've never thought of that.

Does anyone with Rotax flight experience know the answer to that?

news.verizon.net wrote:
Why do you want it to windmill? there is no vacuum system.

Quicker restart.

Paul,

Does it really run at 4300rpm?


Yes (no offense, but in what hole have you been hiding all those years?
;-))

It is geared down. It is a very, very quiet engine, much quieter than
any Lycosaurus or TCM. Thanks to water cooling which also ends the
shock cooling debate. Welcome to 1990s technology.

--
Thomas Borchert (EDDH)

Phil,

I don't think anyone really knows the reliability of this engine and
gearbox. It hasn't been in service long enough.


Are you kidding? These have been in service in huge numbers for well
over a decade. The original Diamond Katana was introduced with them.
These engines are VERY proven. It may have happened outside the US (and
thus outside the advertising range of "Flying" and thus outside their
editorial coverage), but trust me, it still happened.

--
Thomas Borchert (EDDH)

Does it really run at 4300rpm?

You can run it over 5,000 for 5 minutes or so. I usually run about
4,800 in the Evektor Sportstar I fly.

Thomas Borchert wrote in
:

Paul,

Does it really run at 4300rpm?


Yes (no offense, but in what hole have you been hiding all those years?
;-))

It is geared down. It is a very, very quiet engine, much quieter than
any Lycosaurus or TCM. Thanks to water cooling which also ends the
shock cooling debate. Welcome to 1990s technology.


Actually,there's nothing on it that wasn't on some airplane engine by the
end of the first world war.
They're good engines, but I wouldn;t have one.




Bertie