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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Decided to change heads
03-17-2014 02:44 AM  4 years agoPost 1
Gas Power

rrApprentice

Hampstead, NC 28443

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I am building the HD, just started. I got the head built, but the grips are SO tight. I took out spacers, put in spacers, just can't get it to loosen up. What am I doing wrong? Should I just go with the Trex700 head? I do want to keep it flybarred for now.
Please, someone have the answers, I have spent over 4 hours just on the head already.

Thanks,
Jamie

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03-17-2014 04:13 AM  4 years agoPost 2
RM3

rrElite Veteran

Killeen, Texas - USA

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check how the bearings both the axial and thrust are installed...makes sure they are installed in each of the grips correctly...if they are not seatd properly it can cause a fitment issue. Also the dampers and/or spacers may be too wide and causing too much thrust pressure in the grips....I had to trim my dampers down a bit to get the HD head to loosen up.

showing a preference will only get you into trouble, 90% of everything is crap...

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03-17-2014 11:10 AM  4 years agoPost 3
Gas Power

rrApprentice

Hampstead, NC 28443

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I'll try that also, The red dampers do stick out from there sitted spot a little. maybe 1.5mm's
Thanks

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03-17-2014 11:13 AM  4 years agoPost 4
Gas Power

rrApprentice

Hampstead, NC 28443

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Also, how are some pilots using the Trex 700 head when the shaft measures 10mm on here and the t700 has a 12mm shaft?

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03-17-2014 02:37 PM  4 years agoPost 5
RM3

rrElite Veteran

Killeen, Texas - USA

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they use a shaft adaptor...its a sleave that fits inside the 700 head that has a 12mm OD and a 10mm ID...Centurys 90 sized metal head comes with a sleave to allow it to be used on either 12 or 10mm shafts.

on the HD head, make sure to re-install the alumium spacers between the dampers and grips...without them the rubber dampers will rub against the bearing seal and outter rim on the grip. the spacer keeps that from happeneing as it has a small ID ridge that is supposed to just make contact with the bearings ID race only.

showing a preference will only get you into trouble, 90% of everything is crap...

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03-18-2014 03:14 PM  4 years agoPost 6
bjacks

rrKey Veteran

Ft. Worth, Tex.

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G20
I also had trouble with my head, but I got it free up after spending some time on it, crash it and waited 3 months for parts from century and I install a T-Rex head on it and it flew better with the Align head and it and I know I can get Align parts, just my 2 cents worth. Bobby

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03-18-2014 04:05 PM  4 years agoPost 7
Pistol Pete

rrProfessor

Seffner, FL

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how tight is too tight?
I just disassembled a new flybar head I have as a back up which have the red dampeners.

They sit flush with the rims edge and "yes", the rounded side is protruding. Im using two shims; large one first for compressing dampeners and a small one for bearing inner race in grips.

They grips are firm but not overly tight. Sure they wont move on their own freely but nothing the avg servo these days can't handle.

On the other hand, the ball links might need a little reaming to loosen them up.

Just in case...overall spindle lenght is 94mm with a 5.5mm stepdown(83mm from step to step, where trust bearing sit).

I remove the black plastic ball from the center of spindle...personal preference.

~~Enjoying the hobby one flight at a time~~

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03-19-2014 04:33 PM  4 years agoPost 8
strat1960s

rrApprentice

San Antonio Texas

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So in theory, I could put an Align DFC head on my G20????

Ted

I always have fun. Some times are more fun than others.

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03-19-2014 05:04 PM  4 years agoPost 9
gyan

rrKey Veteran

Surrey, BC Canada or Blaine Wa.

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As long as it has a 10MM shaft you can put any head on it. All that is req'd is the linkage length adjustment. I'm using a metal Bergen head on mine.

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