rotax engine

[michelda]

Hi guys

In fto where I fly there is p2006 that we used for MEP rating.
The rotax engines have a limitation of 5800 rpm for 5 min maximum and 5500 RPM continuously.
In the cockpit I have only Map gouge and propeller rpm gouge.
How can know if I' m using the engine at or above 5500 RPM?

thanks for any answer
Michelda

[hetfield]

With a gear ratio of 1:2.4286

- 5.500 = 2.264
- 5.800 = 2.388

[dirkdj]

The engine is probably driving the propeller through a gearbox with a fixed reduction ratio. In this case the propeller gauge will be marked with a red line and a yellow sector.

[Utrinque Apparatus]

Michelda

I believe the Rotax 912 S (?) Engines on your aircraft drive through a 2.43:1 reduction Gearbox, so can work out Limitations from this ? perhaps a quick look at the Rotax website will help

[michelda]

Thanks guys,

but with 16/17 inches of Map, I have the RPM on the red line (like all other kind of engines) and I don't think that the engine is at its maximum rpm.
What do you think?

I checked on rotax website but I didn't get answers.....or I didn't find them

Michelda

[hetfield]

In the cockpit I have only Map gouge and propeller rpm gouge.

So just convert prop rpm to eng rpm, a no brainer IMHO.

Formula......see above.