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Revs

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BEBERRY(at)aol.com
Guest

Posted: Wed Mar 22, 2006 11:22 am Post subject: Revs

Just recently there have been a number of letters which have  indictaed that 

914 flyers , and maybe others, are using a peak rpm of 5800  on take off.  I 

have always thought that 5,700 was the limiting  number. Has there been a 

change?

 

Patrick

Gilles.Thesee(at)ac-greno
Guest

Posted: Wed Mar 22, 2006 11:31 am Post subject: Revs

BEBERRY(at)aol.com a crit :

 	  Quote: 	
		   



      

  

 Just recently there have been a number of letters which have  indictaed that 

 914 flyers , and maybe others, are using a peak rpm of 5800  on take off.  I 

 have always thought that 5,700 was the limiting  number. Has there been a 

 change?

  

 Patrick



   

Hey Patrick,
	




I think the ower's manual as not changed since 1998 regarding power 

settings.  How old is your engine ?

Downloadable from any good Rotax-related website 



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

BEBERRY(at)aol.com
Guest

Posted: Wed Mar 22, 2006 2:10 pm Post subject: Revs

Hi Giles -build started (not by me) in 1999. Engine purchased  2002.  Any 

further commenrts on rev limits appreciated.

 

Patrick

Gilles.Thesee(at)ac-greno
Guest

Posted: Wed Mar 22, 2006 2:20 pm Post subject: Revs

BEBERRY(at)aol.com a crit :

 	  Quote: 	
		   



      

  

 Hi Giles -build started (not by me) in 1999. Engine purchased  2002.  Any 

 further commenrts on rev limits appreciated.

  

 Patrick



   


	


Patrick,



That is about the date we bought our engine. In the crate you have the 

manuals in English and German.

You can download them from the download section in my website or from 

the Rotax website.



The limit is 5800 rpm.



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

hdwysong(at)gmail.com
Guest

Posted: Wed Mar 22, 2006 2:23 pm Post subject: Revs

Hello Patrick -



10.1.1 of the Operator's Manual (July 01/2004, Rev 3) says 5800 rpm (5 

min.) for Take-off, 5500 rpm Max continuous, and ~1400 rpm for Idle.



http://www.rotax-aircraft-engines.com/pdf/dokus/d03378.pdf



D



------------------

BEBERRY(at)aol.com wrote:

 	  Quote: 	
		   

 

      

  

 Hi Giles -build started (not by me) in 1999. Engine purchased  2002.  Any 

 further commenrts on rev limits appreciated.

  

 Patrick

BEBERRY(at)aol.com
Guest

Posted: Wed Mar 22, 2006 3:32 pm Post subject: Revs

Gilles -- thanks , Patrick

rparigor(at)suffolk.lib.n
Guest

Posted: Wed Mar 22, 2006 9:10 pm Post subject: Revs

Hello Patrick



"I have always thought that 5,700 was the limiting  number"



Like others have said 5800RPM is POH limit. That said you need a accurate

tachometer to measure. Airmaster on their Constant Speed uses 5700RPM for

take off power, 100RPM buffer so as to not overshoot the 5800 rpm redline.



I think 6100RPM was the number Phil Lockwood said the valves begin to

float.



Ron Parigoris

william(at)wrmills.plus.c
Guest

Posted: Wed Mar 22, 2006 10:59 pm Post subject: Revs

Hi Patrick and all,

May I suggest you do not rely on the accuracy of the Rotax tachometer. 

After 200 hours, mine was found to be under reading by 300 rpm, which meant 

I had been taking off regularly at 6,100 without knowing!  Fortunately, I 

never cruised at 5,500.  Apparently it is not unusual for Rotax tachos to be 

out of calibration to that extent.

Best wishes,

William



Do not archive



---

BEBERRY(at)aol.com
Guest

Posted: Thu Mar 23, 2006 1:45 am Post subject: Revs

In a message dated 23/03/2006 07:00:29 GMT Standard Time,  

william(at)wrmills.plus.com writes:



Hi  Patrick and all,

May I suggest you do not rely on the accuracy of the  Rotax tachometer. 

After 200 hours, mine was found to be under  reading by 300 rpm, which meant 

I had been taking off regularly at  6,100 without knowing!  Fortunately, I 

never cruised at  5,500.  Apparently it is not unusual for Rotax tachos to be 

out  of calibration to that extent.

Best  wishes,

William



Thanks for that William.    Patrick

topglock(at)cox.net
Guest

Posted: Thu Mar 23, 2006 7:31 am Post subject: Revs

I've heard the same thing about the Rotax tachs.  Fortunately, the 

Airmaster prop controller takes its RPM reading from the prop and 

constrains the engine according to that reading.  Or so I've been told. 

  So far (at 150hrs) the tach coincides with the factory set numbers 

(5700, 5400, 5000) set up in the prop controller.  I've also heard that 

improper adjustment of the ignition/tach pickups can cause errant tach 

readings...



Jeff - N55XS

150 hrs, and now on autopilot... 



BEBERRY(at)aol.com wrote:

 	  Quote: 	
		   

 

      

  

  

 In a message dated 23/03/2006 07:00:29 GMT Standard Time,  

 william(at)wrmills.plus.com writes:

 

 Hi  Patrick and all,

 May I suggest you do not rely on the accuracy of the  Rotax tachometer. 

 After 200 hours, mine was found to be under  reading by 300 rpm, which meant 

 I had been taking off regularly at  6,100 without knowing!  Fortunately, I 

 never cruised at  5,500.  Apparently it is not unusual for Rotax tachos to be 

 out  of calibration to that extent.

 Best  wishes,

 William

 

 

 

 Thanks for that William.    Patrick

 

 

 

 

 

 

 

 

 

  

  

  

 

 

 

 

 


	




--

tonyk(at)kaon.co.nz
Guest

Posted: Thu Mar 23, 2006 12:39 pm Post subject: Revs

 	  Quote: 	
		  > Fortunately, the Airmaster prop controller takes its RPM reading from

the prop and constrains the engine according to that reading.  Or so
	


I've been told. 



That's correct. There is a rotational sensor built into the Airmaster

prop and that is used to provide feedback to the the prop speed

controller. 



Tony

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