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HomeAircraftHelicopterThunder TigerOther › Main head gap ?
10-10-2005 11:28 AM  12 years agoPost 1
Rui_JC

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Portugal

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Hello all,

I've noticed a gap between the main shaft and the main head.
When I fold the main blades into the blade caddy and move the head in an arch movement ( like the arrows in the picture ) I find a gap movement. This gap movement is not up and down... it's like the main shaft has a smaller diameter that it should inside the main head.

Are your raptors 30 V2 like this?
Is this normal or the head has a problem ?

I'm thinking of placing a shim arround the main shaft to remove this gap. What do you think is best?

Keep it up...literally

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10-10-2005 12:39 PM  12 years agoPost 2
playfair

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Rochester, NY

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That's what happens with the plastic heads over time.

I have a bud that wraps a thin shim over the top of the main shaft and forces the head on.

I was getting many flights from using thin CA; with the spindle and pivot out of the head you can see the top of the mainshaft in the hub- carfully drip a little around the shaft.

I more recently used JBweld around the section that pushes into the hub. It hasa held perfect for many flights, but I haven't tried to pull the hub off yet.

I since retrod to the metal head, with the "welded" assembly on backup.


The sky is our canvas

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10-10-2005 01:56 PM  12 years agoPost 3
Rui_JC

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Portugal

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Thanks guys,

One question...

I have been having some tail ( up & down ) motion only in fast foward flight.

Can this be related?

Keep it up...literally

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10-10-2005 11:03 PM  12 years agoPost 4
Rafael23cc

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Junction City, KS

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The real best solution to the problem is a metal head hub, but I believe the glue version will work for you for a while ( i have not done it. I changed the head inmediately after finding the movement)

YES! the movement on the head will cause you to see a tail movement on FFF.

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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10-10-2005 11:16 PM  12 years agoPost 5
Heli-pres

rrApprentice

American Fork

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Head
Dont use glue. Your dealing with a helicopter, do it right and put the metal rotor hub on. Its not much money and it will cure your problem forever.
JOHN


Quick UK Flight Team

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10-11-2005 12:02 AM  12 years agoPost 6
RevGadget

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Decatur, Alabama

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Hey, clue me in. I don't believe I understand the picture or something. Are you talking about the gap between the washout assembly and head block? Or what?


3D2me= One eye on the Tx, one on the Heli and my thumbs in between.

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10-11-2005 12:43 AM  12 years agoPost 7
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Are you talking about the gap between
Nope, The plastic headblock tends to wear the mainshaft bore, such that the entire head wobbles on the mainshaft.

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10-11-2005 01:12 AM  12 years agoPost 8
RevGadget

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Decatur, Alabama

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Got it. Thanks Al.


3D2me= One eye on the Tx, one on the Heli and my thumbs in between.

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10-11-2005 10:16 AM  12 years agoPost 9
Rui_JC

rrVeteran

Portugal

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Al Magaloff, you are correct.

And the best solution is to buy a metal head.

I just bought on ebay a plastic one for now ( cheaper ) but is on my list to buy a metal one and replace the plastic one.

Also want to check my tail movement if it's related to the head gap.

This weekend, after a few minutes of hoovering, low altitude circuits and nose in, started my FFF and i almost saw my heli dissasemble it self in mid air due to the tail big vibration. Managed to stabilise in a perfect hoover and land safe.

Keep it up...literally

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10-11-2005 11:13 AM  12 years agoPost 10
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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Use epoxy as Alexander stated. Yes the best solution is the QUK headblock.

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10-11-2005 11:21 PM  12 years agoPost 11
PietervA

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New Zealand

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I agree, replace with a metal headblock. The plastic hub wears/stretches not only around the mainshaft, but the rotor hub pin also loosens as it's hole becomes more oval. JB works, but you might struggle to get the mainshaft out of the headblock!

BTW, I've started using the hardened mainshafts for my 50s, and now have minimal wear from washout hub, or the mainshaft bearings. Haven't crashed yet to see how they'll destroy the rest of the heli

Enjoy.

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10-12-2005 09:34 AM  12 years agoPost 12
Rui_JC

rrVeteran

Portugal

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Perhaps i'm jumping to conclutions...

I think the gap apeared due to the vibration of the tail !!!!

If i had the metal one the gap would not apear.

The plastic one wears out easy i guess !!!

Keep it up...literally

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10-12-2005 10:28 AM  12 years agoPost 13
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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I think the vibration in the tail appeared when the gap in the head block was large enough to allow the head to rock every cycle.

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