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                           RotaxEngines-List Digest Archive
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                     Total Messages Posted Thu 07/05/07: 1
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Today's Message Index:
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     1. 10:36 AM - Re: RotaxEngines-List Digest: 1 Msgs - 07/04/07  ()
 
 
 
________________________________  Message 1  _____________________________________


Time: 10:36:54 AM PST US
From: <thomriddle@adelphia.net>
Subject: RotaxEngines-List: Re: RotaxEngines-List Digest: 1 Msgs - 07/04/07


Waste of money in my opinion. You can get similar results from simply changing
the pitch of your prop.

Thom in Buffalo
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>            ----------------------------------------------------------
>                            RotaxEngines-List Digest Archive
>                                       ---
>                      Total Messages Posted Wed 07/04/07: 1
>            ----------------------------------------------------------
>  
>  
> Today's Message Index:
> ----------------------
>  
>      1. 11:11 PM - Gearbox Ratio change on Rotax 912UL  (John Herbert)
>  
>  
>  
> ________________________________  Message 1  _____________________________________
> 
> 
> Time: 11:11:30 PM PST US
> From: "John Herbert" <jherbert@vodamail.co.za>
> Subject: RotaxEngines-List: Gearbox Ratio change on Rotax 912UL
> 
> 
> Does anybody have any experience with the efects of changing the gearbox
> ratio on a Rotax 912UL from 2.27 to 2.43 ?
> 
> I have been told, but wish to get more information on this subject, that to
> change the ratio to 2.43 will improve performance. I personally cannot see
> how this is possible as the propeller merely converts available engine power
> to thrust. The only difference that I can possibly see is that the slightly
> slower turning prop with the 2.43 ratio will have a slightly coarser pitch
> than it would have with the 2.27 ratio to get the same static full throttle
> RPM. This will possibly result in slightly better cruise speed at the same
> power setting, but in my mind the effect will be marginal.
> 
> I am installing higher compresion pistons in a 912UL and am investigating
> the idea of changing the gearbox ratio to 2.43. Any ideas or comments would
> be welcome.
> 
> John Herbert
> 
> Tel: 0834634865
> Fax: 0137500938
> 
> P O Box 879
> White River
> 1240
> 
> 
>  
> 
> 
>  
>  
> 
> 


 

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