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jathanjr
Extreme 3D
Extreme 3D


Joined: 21 Jan 2013
Posts: 75
Location: League City, Texas

PostPosted: Tue Mar 12, 2013 5:03 am
PostPost subject: rotor head
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hi everyone, i was just wondering; i have a Dynam e-razor 450 and the rotor head, where the blades are attached has some up/down play. Is this common or not.. how do you fix this, if it is fixable?
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tombo242
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Joined: 04 Nov 2008
Posts: 4718
Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Tue Mar 12, 2013 7:59 am
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Hi jathanjr,

Not sure how it's fixed on your heli, but that play is dangerous. Usually one of 2 ways to sort it:

#1. There may be a collar with a set screw that you can slacken and adjust the collar for no head slack.

#2. You will have to put in shims to remove the slack.

If you have a manual it should give you some idea of how to adjust this, but your problem is that the head can lift - the servos will not and so the pitch will change. If you can see the movement then it is far too much!

Tom.
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jathanjr
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Joined: 21 Jan 2013
Posts: 75
Location: League City, Texas

PostPosted: Tue Mar 12, 2013 8:24 am
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hi tom, how do you remove the blade grips? do you know?
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Burgess
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Joined: 27 Mar 2012
Posts: 1087
Location: Wales

PostPosted: Tue Mar 12, 2013 10:39 am
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Hi jathanjr,

Here is a link to a manual for your heli: -

http://www.dynam-rc.com/download/E-RAZOR450.pdf

Undo and remove the two M3 machine screws and lock nuts and withdraw the blades from the blade holders. Inside the blade holders you will see the hex socket machine screws you will need two hex wrenches to undo the screws from either end of the feathering shaft -which will probably have had thread-lock applied.

Withdraw the feathering shaft and inspect the bearings in both blade holders by inserting the feathering shaft from the inboard end and rotating. This ought to be smooth action with no cogging action felt. Also check the metal spacers and O rings in either side of the rotor housing for wear.

Any problems with these plastic blade holders, just replace the whole set and fit new O rings too.

The design of these plastic blade-holders is similar to Align Trex 450X and the Storm 430.
http://www.helipal.com/stp-002-main-rotor-holder.html

Burgess
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jathanjr
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Joined: 21 Jan 2013
Posts: 75
Location: League City, Texas

PostPosted: Wed Mar 13, 2013 12:42 am
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Hi and thank you burgess! my rotor head is all metal and yes there is definately thread lock on the screws. any ideas how to free the hex screws from the thread lock?
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Burgess
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Joined: 27 Mar 2012
Posts: 1087
Location: Wales

PostPosted: Wed Mar 13, 2013 1:25 am
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Hi,
Use a soldering iron to heat the head of the screw just enough to soften the thread lock. Then first apply just enough tightening motion to crack the seal and then unscrew.


Burgess
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jathanjr
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Joined: 21 Jan 2013
Posts: 75
Location: League City, Texas

PostPosted: Wed Mar 13, 2013 3:19 am
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very good, thank you so much!
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