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HelicopterGasser Model RC HelicoptersOther › Head speed for Industrial twin
11-28-2005 05:46 PM  12 years agoPost 1
TWHM88

rrNovice

IRVING, TX

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I need buy clutch assy for Bergen twin, use it for cameraship with
900mm blade, Is anyone can recommend what RPM for the head
I'll appreciate.

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11-28-2005 07:42 PM  12 years agoPost 2
rbort

rrProfessor

Franklin, MA - USA

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1650

Usually Larry recommends 1650rpms head speed and does not want you to run any less than 1600 as the clutch could slip and burn up.

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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11-28-2005 08:32 PM  12 years agoPost 3
Brett Horton

rrKey Veteran

---------

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Not disagreeing with you, as I do not know anything about the Industrial twin, but 900MM blades at 1650? seems high to me, I run 1450 on my 790's on a GSR260.
Why such a high headspeed?
Once again not trying to start anything just interested in the twin.

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11-28-2005 09:09 PM  12 years agoPost 4
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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No objection noted Brett!!

This gentelman is asking the question because I posed the question to him in an e-mail of "what headspeed does he want to run" so I can send him the appropriate pinion.......

Confusing, I know.........

I was hoping for more info from him, ie; what blades? Are you sure 900's will fit on the heli, (biggest I've used are 850's), and what target RPM is he looking for (1000,1250,1450,1800!)?

Maybe we'll find out..........

Chris D. Bergen

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11-28-2005 09:47 PM  12 years agoPost 5
Dakine

rrElite Veteran

OC, Commifornia

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I'd vote for 1200 - 1250.

I've bent blade bolts trying to spool up 950mm to 1400 headspeed Can you say, "the chicken dance"?

This was not on a Bergen other than just a FYI on biggggg blades. Like I keep on telling my wife, bigger is not always better honey

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11-28-2005 10:06 PM  12 years agoPost 6
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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We had the 850's spun up to 1750 on the Turbine. I was more worried about the blades than the blade bolts.

By the way, those blades are now RETIRED! (sent back to maufacturer for defect )

Chris D. Bergen

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11-29-2005 03:34 AM  12 years agoPost 7
mike lewis

rrApprentice

northeastern AZ

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What was the force?

Applied to the blades at 1750. I guess I would be asking if you could figure how much force in Lbs. was being applied at the grip. 300lbs. 400 lbs. or 500lbs? Any Ideas.
Thanks Mike out in Arizona
PS My Intrepid gasser EB Hanson Pro 260 800MM blades is finely flying well on a regular basic. You should see the faces on the other flyer's when I pull that thing out and spread her wings

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11-29-2005 04:08 AM  12 years agoPost 8
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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As these are fairly light blades at around 250 g, the force wasn't too bad, as I said, I was more worried about the blades than anything else.

It was also only for a short time, (read that as, just as long as it took to spool 'em back down!) They probably would have been just fine, but we were being a little chicken with them as it was a new Turbine also!!

BellBloke has a nice conversion chart on the Turbine forum, I'm at home so I don't have any figures handy, suffice to say, it was OK. The defect was from something unrelated.

Good to hear your bird is doing well, funny how the oddest things can cause vibrations!!

Chris D. Bergen

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