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HelicopterThunder TigerOther › R90 Headspeed?
03-29-2005 01:58 AM  13 years agoPost 1
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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Anybody see a problem with turning 1850 on a R90 with a entire Quick UK head except for stock plastic grips? I'm flying TT 680 Carbon Fiber blades. If I do it, I'll be regearing it so I won't over rev my YS .91.

Don't come off the throttle untill you see your GOD!

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03-29-2005 02:28 PM  13 years agoPost 2
Gary

rrVeteran

Crosby, Texas

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The easiest way to tell, or at least the way I do it, is to take the headspeed you want to run and multiply by the gear ratio. That total is the RPM the motor will be turning. Just make sure you're not running it at 100% of it's peak rpm.

"Who said obsession was a bad thing"

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03-29-2005 04:18 PM  13 years agoPost 3
cjcraigj

rrApprentice

Worcestershire, England , UK

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I dont see a problem, I run 1800rpm with my OS 91 useing the CSM rev Lock.
With the smaller blades you may find you have to decrease the Throttle curve slightly to keep the head speed down tho

(Quick UK Pilot) :- What can I do rather than What Can't I Do! :)

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03-29-2005 06:09 PM  13 years agoPost 4
jvsjvs

rrApprentice

Best, The Netherlands

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No problem at all, I am running 1850 on my metal head with plastic blade holders. Using 8.27 gear ratio, and 710 blades.

Best regards,

John

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03-29-2005 06:43 PM  13 years agoPost 5
Wa11banger

rrElite Veteran

Huntsville, Al

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Same as jvsjvs here.. You really should change the gear ratio to 8.27 to keep our engine at peak RPM and not over.. I also run SAB 710's with that gear ratio and so far am very happy..

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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03-29-2005 07:16 PM  13 years agoPost 6
AlanR8

rrKey Veteran

Saddleworth near Manchester (UK)

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IMHO you only need the HIGH speeds if you're really into "beasting" the heli in a big way. Most club/sports fliers, and I put myself into that category, can get away with much less.

Monday this week, Andy was punishing the air with his SE at about 1890 RPM on the head but it didn't sound quite right. We tached it and the head was loading up and slowing down a tad. Reducd the headspeed to about 1760 and in tictocs there was almost no change in speed. YS 91 8.27 ratio.

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03-29-2005 07:57 PM  13 years agoPost 7
AMainMaker

rrKey Veteran

Nappanee,IN

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I use about 1825 with the 8.27 ratio and a YS91 and MPII on a full QUK head with no problems at all. I am useing 690 V2 blades highly recommended.
Jason

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03-29-2005 11:23 PM  13 years agoPost 8
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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I was already planning on 8.27, just wanted to make sure the head would stay together.

THANKS ALL!

Don't come off the throttle untill you see your GOD!

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HelicopterThunder TigerOther › R90 Headspeed?
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