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Old 23rd Mar 2014, 20:40
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flyer96
 
Join Date: Jul 2011
Location: Kent
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Manifold Air Pressure

Hi All,

I'm trying to understand the process for flying with a constant speed prop on a Rotax 912 ULS. There is hardly any information on this in the POH of the aircraft concerned, but I found this in the Rotax operating manual:

https://www.dropbox.com/s/g5ojged3nl...M%20Curve.tiff
https://www.dropbox.com/s/5rn30esf3f...M%20Table.tiff

From my understanding, I should choose a desired RPM for the fuel burn/speed I want, and set the manifold pressure according to the graph or the table. Am I correct to assume this? Also, I'm aware the MAP will decrease as I gain altitude, but what I am uncertain with is whether I should maintain the MAP shown on the graph (for my required RPM) regardless of my altitude, by advancing the position of the throttle as I gain altitude? I hope this makes sense and any help would be greatly appreciated.

Josh

Last edited by flyer96; 23rd Mar 2014 at 20:43. Reason: Fix broken image links
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