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HIROBO Turbulence - SDX - Freya - Sceadu > X-Spec Head speed?
 
 
traderdave2
Veteran
Location: Covington, GA

My Posts This: Topic  Forum

I have run my freya's / xspec at 1900 for lively performance with a os at 7.9:1.

-Henrik

How is the performance with the YS. That ratio(7.9:1) seems a little too low for the YS.

What muffler are you using?




Harlan
04-18-2005 Over year old.
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Henrik Engert
Key Veteran
Location: Cedar Park, TX

My Posts This: Topic  Forum		I have not looped or rolled or anything like that, but the ratio 7.92 is for F3C flying. Seems fine in hovering though

I am using Hatori SB-16-FH Todd Bennet Special muffler.

I will hopefully get to the field tonight and fly around a little bit.

-Henrik
04-19-2005 Over year old.
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JitsuGuy
Veteran
Location: Tulsa, Oklahoma

My Posts This: Topic  Forum		"J
You want a headspeed around 1750rpm (maybe 1750-1800rpm as some says).
My speed is set at 1770rpm"

Is that the optimum head speed for my setup? (YS 91 and 8:45 ratio)

J
04-19-2005 Over year old.
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mrNoodles
rrProfessor
Location: Borlänge, Sweden

My Posts This: Topic  Forum		Yes
That puts the engine between 14800 and 15200rpm.

Im running 2xYS91 on 8.45 (one with MP2 and one with SB16-FH) at 1770rpm.
04-19-2005 Over year old.
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AndyH
Key Veteran
Location: San Diego, CA

My Posts This: Topic  Forum		With a YS and the 8.45 ratio 1750 works really well - just remeber to set up the flybar with the mixers on the inner most hole.

The 7.92 ratio is a FAI ratio that works wonderful on an OS for FAI. In 3D I had lots of probs. The engine would bog like mad even if I ran the headspeed really high (it worked better at about 1900, but not perfect). No matter what I did It would bog on extreme stick banging maneuvers. 8.18 seems to be right ratio for 3D and the OS engines - unfortunately you can't get that ratio for the Xspec. I've heard there is a way to modify it and put that ratio in, but I don't know the details.

I switched to a YS with the 8.45 and couldn't be happier!!! No more bogging!!
04-19-2005 Over year old.
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MRC-Hirobo
rrAdvertiser
Location: Edison, NJ

My Posts This: Topic  Forum		I have run both and actually went back to the 7.91 at 1900. At that headspeed for my setup I reduced the amount of elevator trave 5% at a time until it quit the bog but still remained snappy. At 8:45 I could still bog the head anyway. The aggressiveness at 1900 is really cool. Especially on the Freya Evo.

Right now I am using the 7.91 on the Evo head vs the 8:45. It feels just like a Evo on the 7.91

For all Freyas and Eagles all components are rated to 2000.

Final headspeed is all dependant really on what you like.

Jeff
04-19-2005 Over year old.
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mrNoodles
rrProfessor
Location: Borlänge, Sweden

My Posts This: Topic  Forum
Quote 
The aggressiveness at 1900 is really cool. Especially on the Freya Evo.
Yeah thats right, make us even more tempted
04-19-2005 Over year old.
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Defiant
Key Veteran
Location: Leander , Texas

My Posts This: Topic  Forum
Quote 
I have run both and actually went back to the 7.91 at 1900.




Gonna try that this weekend!!!!


Cheese

*
04-19-2005 Over year old.
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Duracizer
Senior Heliman
Location: Oak Ridge, NC

My Posts This: Topic  Forum
Quote 
I have run both and actually went back to the 7.91 at 1900.


Sounds like this is where I will start for Idle-up...

_______________
| XSpec | Evo50 |
04-19-2005 Over year old.
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JitsuGuy
Veteran
Location: Tulsa, Oklahoma

My Posts This: Topic  Forum		Well, cool, I'm glad to hear a 1770 to 1800 for my setup. Fast spinning blades scare me.

J
04-20-2005 Over year old.
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Duracizer
Senior Heliman
Location: Oak Ridge, NC

My Posts This: Topic  Forum		It's not so bad when you are wearing your portable heli-shield

_______________
| XSpec | Evo50 |
04-20-2005 Over year old.
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HIROBO Turbulence - SDX - Freya - Sceadu > X-Spec Head speed?
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