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vmenkal(at)mac.com
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 Posted: Wed Aug 19, 2009 5:53 pm Post subject: Jab 3300 vs Rotax 912ULS performance - technical interpretat |
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Hi folks. Trying to determine the increase in performance I could
expect by using a Jab 3300 rather than a Rotax 912ULS in my soon to be
built CH750 and would appreciate some technical help with the numbers.
The numbers I get are as follows
Jabiru 3300 (at) 3300 RPM, 123 HP, 200 ft lbs, 178 lbs "ramp" weight,
$24500 with CH750 FWF
Rotax 912ULS (at) 5800 RPM, 100 HP, 94 ft lbs - 225 ft lbs with 2.43
reduction gear, 156 lbs "ramp" weight, $20000 with CH750 FWF
Was I correct to calculate the shaft torque for the Rotax by
mulitpllying by the reduction gear ratio?
Would some power loss but not torque? Ie the Rotax max HP at shaft
will actually be a bit less due to friction losses but torque will be
same.
Appreciate technical advice on these numbers ie what does higher HP
but lower torque in Jab actually mean in real life? Will the Jab
give faster cruise but the Rotax more pull under heavy loads?
I am particularly interested in what the numbers would mean for float
operations.
Thanx gang.
Cpt Vic
Building Zenair CH750
Whitehorse Yukon
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pete(at)flylightning.net
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| Posted: Thu Aug 20, 2009 8:47 am Post subject: Jab 3300 vs Rotax 912ULS performance - technical interpretat |
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Based on US prices your cost figures for the Jab and Rotax are backwards.
Jabiru 3300 plus fwf kit = $20,450. Rotax + fwf kit = $24,500+
Pete Krotje
Jabiru USA Sport Aircraft, LLC
931-680-2800
www.usjabiru.com
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