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HelicopterMiniature Aircraft Whiplash & Fury 55 › Cyberheli Helical Gears
12-19-2003 11:44 AM  13 years agoPost 1
johnb

Key Veteran

Guildford, Surrey UK

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Has anyone tried the helical 8.18:1 gears from Cyberheli?

I'd be interested in hearing the benefits, noise?

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12-19-2003 11:17 PM  13 years agoPost 2
Arjan

Heliman

UK

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Why would you change it if the original gear works fine? I have many flying hours on my Furry and still using the original gear and it shows absolutely no sign of wear. Also i think the gear hub of the fury is not designed to transfer axial loads to the main rotor shaft. The normal gear "floats" between the teflon o-rings. Try some sound absorbing material inside the canopy if you are woried about the sound comming from the gears But a helical tailgear set would be more interesting!

Best regards, Arjan.

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12-19-2003 11:34 PM  13 years agoPost 3
rckrzy1

Elite Veteran

Hurst Texas

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But a helical tailgear set would be more interesting!
Yep got them in my Pmax.



Wildcat Fuels

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12-30-2003 09:22 PM  13 years agoPost 4
invrtd

Veteran

Victorville CA

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THe old tsk's had the helical main gear. They have the smoothest feel of any gears. You can't get any smoother unless you go to a belt drive like the Robbe machines. It is also quieter. If your flying FAI it may impress the judges with a quite machine.

Clark

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12-31-2003 02:17 AM  13 years agoPost 5
Agilefalcon

Key Veteran

Fort Worth, Texas

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Yes, helical gears are smoother; however, using them imposes a thrust component on the bearings and loads the gear. If the gear is designed to take the vertical/thrust load, then you'll be fine.

Chris Berardi
Team BobbyJack's Hobbies

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02-26-2004 03:05 PM  13 years agoPost 6
wjvail

Key Veteran

Meridian, Mississippi

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Anyone got an update on this yet? Anyone flying a set? Experiences?

In the name of something different, I got a set on the way. I was hoping someone could say they loved 'em or hated 'em.

Anybody?

Bill

"Well, Nothing bad can happen now."

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02-26-2004 04:16 PM  13 years agoPost 7
invrtd

Veteran

Victorville CA

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I loved them on my TSK's.

Clark

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02-26-2004 05:35 PM  13 years agoPost 8
wjvail

Key Veteran

Meridian, Mississippi

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Thanks Clark. Anyone try a set with the X-Cell auto unit? As someone pointed out they will put a thrust load on the unit when powered.

https://www.cyberheli.com/shop-prod...?ProductID=1915

Bill

"Well, Nothing bad can happen now."

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02-28-2004 01:57 PM  13 years agoPost 9
leadlag

Veteran

Worthing UK

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The advantage of having helical gears is that they are quieter than straight cut.

The Disadvantage is that they do not transmit the power as efficiently as straight cut.

As simple as that.

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02-28-2004 07:47 PM  13 years agoPost 10
kenman

Senior Heliman

Columbia, Maryland, USA

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That is exactly right and that's why you find helical gears in passenger car trannies, and straight cut gears in race cars.

Ken

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04-01-2004 12:18 PM  13 years agoPost 11
Spoon

Heliman

Hong Kong

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now i am using the 8.45 helical gears from Stephen .... very well

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04-01-2004 01:23 PM  13 years agoPost 12
smudge

Senior Heliman

Wiltshire, UK

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Thrust loads

I dont see the problem with a thrust load.

The helical angle is usually only about 20-30 degrees. Anyway, that big whirly windmill thing on the top provids a lot of thrust load.

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04-01-2004 06:38 PM  13 years agoPost 13
Gero Adrian

Senior Heliman

Stuttgart, Germany

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Hi,

@leadlag,kenman
wrong - due to the fact that more teeth are in contact, you can transmit more torque. The reason for straight gears is:

- you are able to shift with reduced or no clutch usage - see bikes.
- cheaper


If you have gears with so called evolvents, they will run as quit as helicals. The real disadvantage of helical gears is the force in the axis direction. You need additional axial bearings (like in the blade holders)

bg

Gero

Best regards

Gero

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