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HomeAircraftHelicopterHIROBOOther › Gear ratio on evo 90
03-09-2008 11:32 PM  10 years agoPost 1
filou406

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Lexington SC US

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Hi
Some weeks ago you spoke about a new gear ratio for evo 90, 8.27 instead of 7.9 for OS in 3D flight Somebody has compared both of them with 90os SZ in 3D with 710mm blade? Which is the best for this configuration?
Thanks

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03-11-2008 10:45 PM  10 years agoPost 2
filou406

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Lexington SC US

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Nobody has made the comparaison??
Thanks

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03-11-2008 11:11 PM  10 years agoPost 3
shlm

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West Chester, PA

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During our testing we found the 8.27 to be the better choice of the two. It allow you to take advantage of the torque without having a high head speed. In addition, the engine would pull stronger as compared when pushing it.




Steven B.

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03-12-2008 05:25 AM  10 years agoPost 4
oldboldpilot

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Southern California

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Would this not also be a great ratio for the new YS?

Helis are Man's Defiance of the Laws of Nature - OCHC

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03-12-2008 07:50 AM  10 years agoPost 5
shlm

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West Chester, PA

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Yes, with the YS SR.




Steven B.

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