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HelicopterMain Discussion › Main Gear Teeth Missing on Hawk IV
03-16-2003 11:57 PM  14 years agoPost 1
SteveP2

rrNovice

West of Ireland

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My Hawk IV started making a clicking noise today, when I started the engine after a minor 'crash'. The blades had struck soft ground when I sent it into a right side landing from about 1 foot high (I'm still a very poor pilot, as you may tell).

I looked at the main gear and saw that some teeth were missing in about 3 different places on the wheel, about 3 teeth in each place - worn down or cut off - and this was causing the clicking noise. The Hawk IV has only had about 30 mins of flying time since I got it.

Is it normal (or common for the Hawk) to lose teeth from the main gear like this - and what would have caused it? Surely this must be a design fault that Century should be told about?

Thanks for any help.

Steve P.

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03-17-2003 12:16 AM  14 years agoPost 2
gwallace1

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Susanville, CA

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Any time that the tail rotor comes in contact with the ground, you run the risk of stripping teeth off the main gear. For the first three months I went through three main gears, until I figured out that it was a good idea to keep the tail out of the terra firma. Put a new gear on and you'll be on your way!! Just remember not to throw the one way bearing that is in it away. The bearings are like $35.00, but the main gear is only about $8.95.

Greg

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03-17-2003 12:35 AM  14 years agoPost 3
Indrid

rrKey Veteran

Hamburg, NY

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yep i had that happen too, luckily main gears are only $8.

dont crash, and all will be fine.

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03-17-2003 04:53 AM  14 years agoPost 4
Ace4

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Chandler, AZ

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Yeah my first crash ate some teeth on my Falcon's main gear. That and it liquefied the gears in the tailrotor gearbox. I think the main gear is pretty easy on strip teeth from during a crash on the Hawk/Falcon.

Ace4

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03-17-2003 05:01 AM  14 years agoPost 5
Indrid

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Hamburg, NY

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yes, if anything i would like to see a stronger maingear...

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03-17-2003 09:39 AM  14 years agoPost 6
SteveP2

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West of Ireland

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Thanks for the advice guys. My tail rotor had hit the ground (albeit very soft soil) prior to losing the teeth. So, that is obviously the answer!

Steve P.

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03-17-2003 04:21 PM  14 years agoPost 7
scottc

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shakopee​minnesota..USA

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had that happen to my hawk also.....

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03-17-2003 05:16 PM  14 years agoPost 8
oldfart

rrProfessor

Vancouver, Canada

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missing teeth

Guys, hitting ANY object but air with ANY shaft drive heli (wire or tube) will strip teeth from the top of the maingears.

The T/R is spinning at 8000 or so RPM. So when the T/R comes in contact with anything there is a lot of energy to dissipate.....something has to give. In this case it is the teeth on an inexpensive part. If they did not give something else would have to bend (output shaft or t/r hub) ) or break (T/R transmission case, blade holders or tail blades). NOTE: these are what will be damages in a belt drive system,

Sometimes you can hit a solid object in a crash so hard that you can damage all these parts!

Moral of the story - Keep the tail rotor away from anything but air when it is under power.

Phil

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03-17-2003 05:54 PM  14 years agoPost 9
Indrid

rrKey Veteran

Hamburg, NY

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belts are probably more durable.... but more finicky with temp changes and such. i guess it comes down to preference, as some people are having helis upgraded from belt to TT while others are having them done into belt drive FROM torque tube....

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03-17-2003 09:32 PM  14 years agoPost 10
oldfart

rrProfessor

Vancouver, Canada

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Stephen

Please read the "NOTE" in my original post - it refers to what will give (read break or bend) in the belt drive system.

Actually these teeth breaking are an advantagemore expensive items from breaking and will even save the torque tube in most instances.

This is another of their advantages.

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