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03-29-2005 07:51 PM  13 years agoPost 1
Scooterpilot

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Southern, California

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Hi ,

I have one quick question ???????????

Here's the information:

It's a Raptor 60V2 with a YS 61 STII and a Hatori SB15. The pinon is 10 tooth, main is 93........ 93:1. I'm running TT carbon blades, 10/-10 pitch with 6 degrees of cyclic pitch. Main and t/r blades lengths are stock

What's the best head speed for the above confirguration?

What the highest head speed I can run without harming the motor?

All comments welcome


Chuck

Two G-4's & X50's YS60SR,Futaba 18SZ/12Z/14FG, ,Rail Blades Rep

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03-29-2005 08:38 PM  13 years agoPost 2
nitro.burner

rrNovice

ireland

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1850 sounds good

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03-29-2005 11:01 PM  13 years agoPost 3
Wa11banger

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Huntsville, Al

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well given the math and I suck at math.. 1850 HS at 9.3:1 gives a practical RPM of 17,205.. The YS .61 ST2's practical RPM range is 2,000 to 18,000 RPM and being most any MFG (YS, OS, Supertiger, ETC) all overstate small portions of thier engines performance I would say that will have your engine at hover on the bleeding edge of being maxed out... 1750 HS gives a little more breathing room on practical RPM and leaves some to spare (carb movement) when you punch out with collective. I would think that if you ran it at 1850 and bogged down... it would leave you with nothing left of engine performance or carb arm movement left to add when and if you needed it. I know collective management is deffinately a big player in this, and I know you have excellent collective management skills sensei But not having any extra throttle running at 1850 and 17.205 RPM (hovering at full throttle basically) would leave you nothing in reserves for emergency needs.. Even if you kept the 10t pinion and went to say the 91 tooth gear very minor change.. It would still leave you at 16,835 RPM at 1850 HS... But I still believe the pipe is not made to run at full RPM I beleive they make their best performance a ways under full RPM. I would wager to say your best bet would be to keep the 93T main and go to the 11T pinion giving you 8.45 if you ran 1850 HS you would effectively have a practical RPM of 15,632 leaving you plenty off gas adding carb movement when you needed it

Just my .02
Rick
See ya at the field this weekend

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

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03-30-2005 03:13 AM  13 years agoPost 4
freezin Eskimo

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Flagstaff,AZ 86004

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If the Power Out Put Is Close or The same as a OS 61!
The Practical Rpm is the Same as an OS 61sx-h WC, which i believe would be the same HP RPM, which is produced at 16000rpm.

If you use the Gear Ratio(9.3:1) Divided in to horse power range(16000rpm) you would get a Headpseed of 1720rpm which would be at o around the peak horsepower of the motor, and still give you 2000rpm on the motor to play with in bogging situation.

Witha 9.1 gear ratio you would get a headspead of 1758rpm.

If you went with a 95 t main gear and 11t pinion (8.63 gear ratio) you would get a headspeed of 1853rpm at 16000 motor rpm.

To keep the motor From Boggin in Hard maneuvers i would stick with 680mm blades. It all depends on what your want the heli to do.

Just my .02.

Karl
PS Or You could Run The Headspeed at 1750 and have the it pull itself in the HP range!

Just Enjoy The Ride!

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03-30-2005 02:23 PM  13 years agoPost 5
Scooterpilot

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Southern, California

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RPM,
Karl,

Thanks for the input, it's appreciated.

Regards,

Chuck

Two G-4's & X50's YS60SR,Futaba 18SZ/12Z/14FG, ,Rail Blades Rep

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