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Rotax 912s Benchmark Performance

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irampil(at)notes.cc.sunys
Guest

Posted: Wed Apr 04, 2007 5:20 am Post subject: Rotax 912s Benchmark Performance

Greetings All, 

 

I have been interested for some time in developing a set of performance data for the Rotax 912s 

as installed in my Europa Trigear.  This information, provided in the POH of all certificated 

constant speed propellor aircraft is sadly lacking from Europa or Rotax manuals. 

 

I am enclosing the static performance data at sea level on a standard pressure day for my engine. 

The aircraft is chocked and not moving. At some point soon I hope to add the data including TAS 

airspeed at 3000, 6000, 9000 feet density altitude.  NM means not measured because I thought 

higher power would jump my chocks! 

 

Hopefully this data will allow us to make informed choices for MP and RPM settings for speed or 

economy, etc. 

 

 

At this point I would appreciate comments on the data and methods, etc. 

 

Cheers, 

 

Ira   N224XS

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nwcmc(at)tiscali.co.uk
Guest

Posted: Thu Apr 05, 2007 10:34 pm Post subject: Rotax 912s Benchmark Performance

The figures you supply are interesting in that they show relative fuel consumption with different power settings. The absolute figures will obviously change a bit for an aircraft in the air with the change on prop loads for the aircraft flying at speed. For what it is worth in practical terms I found the following relevant.   

   

Using a variety of throttle and prop settings I came to the following conclusions:  

     Despite the fact that the minimum drag speed is given as 75kts the      aircraft seems to be a lot happier in terms of angle of attack once it is      above 100kts. I doubt that there is much to be gained flying slower than      this.  
With that in mind I used two speeds to compare fuel flows: 105kts      and 120kts IAS  
At 120kts the difference between 4500rpm and 5000rpm gave negligible      differences in fuel flow as greater throttle settings were needed at      4500rpm.  
At 105kts there was a 1.5litres/hr benefit from using 4500rpm over      5000rpm.   
Although the fuel flow is significantly lower at 105kts the better      overall economy is not much better because you fly 15nm less in any given      hour.   

   

The engine gives better fuel flows with lower OAT so I generally found it worthwhile climbing to 7000-8000ft in hot weather to get cooler air into the engine. Some day I must do some comparison figures up there as well.  

   

Hope this is of interest.  

   

Regards  

   

Nigel Charles  

   

-----Original Message-----

 From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of irampil(at)notes.cc.sunysb.edu

 Sent: 04 April 2007 14:19

 To: europa-list(at)matronics.com

 Subject: Fw: Rotax 912s Benchmark Performance  

   



  Greetings All, 

 

 I have been interested for some time in developing a set of performance data for the Rotax 912s 

 as installed in my Europa Trigear.  This information, provided in the POH of all certificated 

 constant speed propellor aircraft is sadly lacking from Europa or Rotax manuals. 

 

 I am enclosing the static performance data at sea level on a standard pressure day for my engine. 

 The aircraft is chocked and not moving. At some point soon I hope to add the data including TAS 

 airspeed at 3000, 6000, 9000 feet density altitude.  NM means not measured because I thought 

 higher power would jump my chocks! 

 

 Hopefully this data will allow us to make informed choices for MP and RPM settings for speed or 

 economy, etc. 

 

 

 At this point I would appreciate comments on the data and methods, etc. 

 

 Cheers, 

 

 Ira   N224XS

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