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HelicopterAlignT-REX 700N › So what headspeeds are you running on your 700N...
07-09-2008 04:46 AM  9 years agoPost 1
Locktite

rrVeteran

N.J

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I am going to be using a YS .91sr with hatori pipe in my 700N..I am just wondering what headspeed most people are running..In my Idle ups I plan on being somewhere between 1850-1900rpm...What are you using...

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07-09-2008 06:04 AM  9 years agoPost 2
PilotCK

rrVeteran

Scottsdale, AZ

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Good question: I am thinking between 1850-1950, I'm runnin the same set up.

~Team Collective Mayhem

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07-10-2008 12:04 AM  9 years agoPost 3
ckd

rrApprentice

Saugus CA

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1=1850
2=1950-2000
os91 pump
I mostly fly in idle up 1

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07-10-2008 12:37 AM  9 years agoPost 4
baddynergy

rrElite Veteran

sierra madre, ca- usa

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If your running the YS SR dont run it at max RPM it likes to run under that, 1900 on the head with the TREX should be max. Its a torque motor and likes to run a little rich and power through anything.

**Unattended children will be givin a shot of espresso and a puppy**

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07-10-2008 02:44 AM  9 years agoPost 5
heliloco

rrNovice

Covina, CA

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I'm installing an OS 91 SZ-H on mine. What head speed do you guys recommend?

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07-10-2008 02:54 AM  9 years agoPost 6
Gyronut

rrProfessor

Martinsville In.

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91SZH for mine also when it gets here.
Will use 1850 and 1950

Rick

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07-10-2008 10:24 PM  9 years agoPost 7
Trevor Burley

rrNovice

Home

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I've been running mine at 2000rpm since mid May with an OS91 SZ and Hatori 939 Muffler, seems to be holding up nicely after quite a few gallons.

Trev

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07-11-2008 02:11 AM  9 years agoPost 8
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

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Hey Badd, what are the specs on the YS 91 SR???

What is the RPM for max power?

For the OS 91 the 3.3hp is produced at 15000 rpm. If the gear ratio on the 700N is 8.2:1, then we should be using a headspeed closer to 1830 rpm.

1950 sounds a bit high for this heli/engine combo.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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07-11-2008 02:12 AM  9 years agoPost 9
Ghostrider

rrElite Veteran

San Diego, CA

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I would not go any higher than 1900 with the 700 gearing!

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07-11-2008 02:16 AM  9 years agoPost 10
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

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Ghost, what is the gear ratio on your Stratus, and what headspeed have you settled on for flying that beast???

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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07-11-2008 03:44 AM  9 years agoPost 11
Ghostrider

rrElite Veteran

San Diego, CA

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B]Ghost[/B], what is the gear ratio on your Stratus, and what headspeed have you settled on for flying that beast???
8.18 @ 1925

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