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Thunder Tiger Raptors 30-90 - Imperio > RAPTOR 90 Max Head Speed Raptor 90 3D
 
 
ov10mech
Heliman
Location: Lake County, Illinois

My Posts This: Topic  Forum		Guys,

What is the maximum head speed I can run safely on a Raptor 90 3D with CY blades and TT metal grips?

Raptor 90 3d - TREX 500 - TREX 600 ESP -TREX 450
07-01-2009 11:46 PM
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jsenicka
Elite Veteran
Location: Hampton VA

My Posts This: Topic  Forum		more than you can safely twist your motor :-)
1900-2000 is pretty normal

Jim Senicka
3x T700N/OS91 - 3x Vibe 50/OS55HZ - Trex 450 Pro
07-02-2009 02:09 AM
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50feet
Key Veteran
Location: Wilmington, Delaware

My Posts This: Topic  Forum		Yeah...

To high and you may just break your con rod... I have seen it happen.

You need to set it for your engines peak RPM using the gearing your using.

Team Thunder Tiger
Team MAPTERGY
To trust no one is to trust everyone equally
07-02-2009 03:23 AM
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ov10mech
Heliman
Location: Lake County, Illinois

My Posts This: Topic  Forum		Forgot to mention. Using a OS 91 HZ 11T Pinion and 91T gear. I can move up to a 12T pinion to lower the engine RPM.

Raptor 90 3d - TREX 500 - TREX 600 ESP -TREX 450
07-02-2009 03:33 AM
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50feet
Key Veteran
Location: Wilmington, Delaware

My Posts This: Topic  Forum		Well

That engine puts out 3.4H @ 15000/8.27 = 1813

Max or practical RPM 16000/8.27 = 1934

So roughly 18-1900rpm

If your gunning for a particular (HS Engine RPM / Head speed )and see if you can get a close gear ratio.

I personally think 1900 is high enough for a 90....

Team Thunder Tiger
Team MAPTERGY
To trust no one is to trust everyone equally
07-02-2009 05:15 AM
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ov10mech
Heliman
Location: Lake County, Illinois

My Posts This: Topic  Forum		Thanks. 1900 ish seems to be consistent guidance.

Raptor 90 3d - TREX 500 - TREX 600 ESP -TREX 450
07-02-2009 05:17 AM
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jsenicka
Elite Veteran
Location: Hampton VA

My Posts This: Topic  Forum		8.27 (11/91) and 1900 on the head is fantastic on that bird assuming you have a good pipe.
I am running the SB18/1900 and love it.

Jim Senicka
3x T700N/OS91 - 3x Vibe 50/OS55HZ - Trex 450 Pro
07-02-2009 11:38 AM
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Reaaz
Heliman
Location: Trinidad

My Posts This: Topic  Forum		Hi guys, I got an elevated RC 90 tooth gear to try out with an 11 tooth pinion & to bring down the engine rpm a little. I still have to swap it in though.
I have been running 1950 rpm on a 91 tooth gear all the time before though. Work quite well (1950rpm x 8.2727 = 16132rpm)

has anyone tried the 90 tooth gearing 8.18 ratio(1950rpm x 8.1818= 15954rpm)before? Results/opinions?
07-07-2009 07:03 PM
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BJames111
Elite Veteran
Location: Billings, Montana

My Posts This: Topic  Forum		I've been using it for a couple weeks. I like about 1940 with my SR engine. Good pop, and loads of power.

Brian James
07-07-2009 07:56 PM
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MartyH
Elite Veteran
Location: Cincinnati

My Posts This: Topic  Forum		Yes, if it's properly setup I think you'd have to damage the motor before you'd scatter the head. As others have stated, 1900rpm is a good place to be if you are beating on it pretty good. I'm running significantly less and for my mild tumbling it's plenty. It is nice that the componentry is matched up so well to the available power.

Marty,
Raptor 90 3D, Freya and more
07-08-2009 01:07 PM
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Dino Spadaccini
Key Veteran
Location: USA

My Posts This: Topic  Forum		rpms

most of the team guys including myself run our Hz motors at 1940 on 8.27 one thing to remember is we keep our heads loaded for the flight if you are unloading the head to much you will hurt the motor, so if your not beating the hell out of your R90 1900 works great one thing to remember is tuning the motor for your flying style is very important and will make all the differance how you fly the heli and how it flys

Brian 1940 you are using the 90 tooth main on the 11 tooth pinion for 8.18 with that motor.

Team Thunder Tiger
Team Futaba
CY Enterprises
Morgan fuel
07-09-2009 01:35 PM
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BJames111
Elite Veteran
Location: Billings, Montana

My Posts This: Topic  Forum
Quote 
Brian 1940 you are using the 90 tooth main on the 11 tooth pinion for 8.18 with that motor.

OOPS! I should have made that clear, yes I'm using an aftermarket (Elevated R/C) 90 tooth main gear and 11 tooth pinion.. 1940 is likely on the brink of disaster, perhaps I'll lower it just a tad...

Brian James
07-09-2009 01:51 PM
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Thunder Tiger Raptors 30-90 - Imperio > RAPTOR 90 Max Head Speed Raptor 90 3D
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