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1. 10:36 AM - Re: RotaxEngines-List Digest: 1 Msgs - 07/04/07 ()
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| Subject: | 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
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> Total Messages Posted Wed 07/04/07: 1
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> Today's Message Index:
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>
> 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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