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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawl Pro Torque Tube Question
05-03-2005 10:26 PM  12 years agoPost 1
marked23

rrKey Veteran

Lynnwood, WA

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A question for somebody who has the kit:

In the Hawk Pro kits, the entire tail assembly comes pre-assembled, right? The torque tube is already attached to the tail output gear.

My question is:
How is the torque tube attached at the rear? I'm looking at the pictures and I don't see the bayonet style connection that the old Hawk TT upgrade had. So what is it now?

-Mark

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05-03-2005 10:59 PM  12 years agoPost 2
HeliAdict

rrApprentice

Texas

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The input shaft slides inside the tt and there is a collar with a set-screw that sets against the input shaft.

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05-03-2005 11:40 PM  12 years agoPost 3
marked23

rrKey Veteran

Lynnwood, WA

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On the input shaft, is there a flat that the set screw compresses against?

If so, does that mean that the tube end is deformed by tightening the set screw?

If not, does that seem like an interface that is likely to slip after repeated stress?

-Mark

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05-04-2005 12:29 AM  12 years agoPost 4
HeliAdict

rrApprentice

Texas

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I haven't taken it down that far yet. I am building it for a friend and only looked at it out of couriosity. If someone else doesn't chime in with the info you are asking I will open it up and look tomorrow.

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05-04-2005 04:39 AM  12 years agoPost 5
Gearhead

rrMaster

Vt

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same way as the front.

Jim

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05-04-2005 05:14 AM  12 years agoPost 6
marked23

rrKey Veteran

Lynnwood, WA

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Wasp,

Well, no. The Hawk Pro has a different torque tube than the upgrade that is available for the Hawk Sport. That's why I'm asking.

I have a theory about why they changed it. I suspect that the tube is different because with the old system, a replacement tube consisted of two bayonet ends and a bearing. The new replacement tube, I'm guessing, will have one bayonet end and no bearing. Presuming you didn't destroy the bearing in your crash, you can just slip on the one you already have. This makes the replacement cheaper to make, and I hope, cheaper to buy.

We'll see.

-Mark

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06-03-2005 06:54 PM  12 years agoPost 7
ThBrtmn

rrVeteran

Savannah, Georgia

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Whats the latest on this...I have the upgraded TT for the sport....I have 2-3 bearing cups that I kept from the CF And the SS TT that have bit the dust...On the rear output shaft it has a flat spot for the set screw of the dogbone cup that the end of the TT -dogbone/knuckle slides into.. That platic cup comes off. Can you use the Pro TT on it? Will it be cheaper?

~BART~

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06-03-2005 07:36 PM  12 years agoPost 8
marked23

rrKey Veteran

Lynnwood, WA

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I did some online research on this. I don't have both parts to actually compare.

The Hawk Pro instructions list that part as HW3070A.

The Raven 50 uses this same HW3070A part with the dogbone cup on it. The Hawk Pro instructions show no cup... like the tube directly connects to the tail input shaft with a collar and some set screws.

If that part is the same part (and I would presume that it is) that comes with the Hawk Sport upgrade, then you are good to go with buying the Hawk Pro TT replacement... so long as you get that collar and set-screws. (HW3065 and/or HW3065A)

Cheaper, yes. I'm guessing that's why there was a design change.

-Mark

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawl Pro Torque Tube Question
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