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HomeAircraftHelicopterAerial Photography and Video › Helical gear question
10-26-2012 10:27 AM  6 years agoPost 1
Helicek

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istanbul - turkey

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Hello everybody,
Are helical gears designed to turn in a specific direction?
Will it hurt the gear system on my t-rex F3C helicopter, if the direction is reversed?
Let us know what you think.
Cheers,
Ahmet

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10-26-2012 11:54 AM  6 years agoPost 2
adamsz06

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Geilenkirchen Germany

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How'd that happen? Pinion and main gear both installed upside down?

R.I.P. Roman

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10-26-2012 02:50 PM  6 years agoPost 3
G-Limo

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Europe

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The shaft thrust direction on the pinion gear is reversed if you turn them the other way.. The Pinion shaft will get pulled out (if originally it was pushed in) if you see what I mean..

/Limo

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10-26-2012 05:24 PM  6 years agoPost 4
Helicek

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istanbul - turkey

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Hi Limo,
you are right about the axial trust. Other than that I guess you can spin them either way.
Cheers,
Ahmet

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10-29-2012 04:49 PM  6 years agoPost 5
splitboarder

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San Diego, California

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You can just swap two motor leads and everything will turn the opposite direction. You will need to swap blades around on your main hloders and tail holders.

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10-29-2012 05:43 PM  6 years agoPost 6
G-Limo

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Europe

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A great idea, providing it's a FBL Head as you can flip the Blade Holders over.

This solution will be more of a problem if it's a FB Head. If the Pitch arms change to lagging rather than leading may make a difference. Make sure you have no Delta Offset on the blade holders to screw up the stability!!

Limo.

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10-29-2012 06:32 PM  6 years agoPost 7
Helicek

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istanbul - turkey

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Hi Guys,
I just wanted to increase the existing gear ratio on my t-rex f3c AP heli to suit 470rpmv (and 500rpmv) brushless motor to spin 180cm main rotor efficiently around 1200rpm running on 12S.
It is possible to do this if a secondary reduction is implemented like Vario ships. I am working on it and I will let you look at my design soon.
Ahmet

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