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HomeAircraftHelicopterHelicopter Main Discussion › What fuel % do you use for your OS91
07-18-2002 11:58 PM  16 years agoPost 21
Rotor

rrKey Veteran

Springfield, MO USA

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heli4me,
You spoiled your "bird" now live with it!!! Start to get over it!!!

My motto is this..Fly...Rebuild...Fly

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07-19-2002 12:02 AM  16 years agoPost 22
Heli-Driver

rrElite Veteran

Arlington, TX

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I don't have my 91 in the air yet but I'm planning on running CP15%.

I will break it in by adding two ounces of Klotz to the first gallon, maybe an ounce the second gallon and after that straight CP15%.

No doubt this engine will generate plenty of power with 15% and it is quite affordable locally.

I have a Hatori SB15 pipe ready to go and I don't plan on running a pump nor a header tank. It's going in a Fury Extreme with an 8.18/1 gear ratio.

I'll be using 700mm RotorSport 3D blades and 105 NHP's on the tail.
I do intend to govern this motor and plan on running the head at 1550, 1750 and 1835 RPM.



Raymond

Predator Gasser SE/231 X 2
Century Helicopters

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07-19-2002 12:05 AM  16 years agoPost 23
heli4me

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Springfield MO.

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Rotor
looks that way, guess that drum of 30% will get ordered sooner than i thought!

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07-19-2002 12:09 AM  16 years agoPost 24
Rotor

rrKey Veteran

Springfield, MO USA

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heli4me,
If you'll quit "whining" I will split the drum of 30% with you..heheheh..

My motto is this..Fly...Rebuild...Fly

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07-19-2002 12:16 AM  16 years agoPost 25
Ehab

rrApprentice

Beautifll San Jose, CA, Good old USA

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30% nitro, 18% syn oil, WC fuel, perry pump, hyper head, Hatori 980, 680mm on Freya. Engine ran perfectly from day one. Two head shims. I get easy 18-20 mins, BUT, I do a lot of Autos and regular aerobatics, no hard 3D. Tried 15%, much less power and idles a little rough(in a Fury). The cost of $2-3 extra for the 30% pales to compare with $1500-2000 helis that we sick people fly

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07-19-2002 12:30 AM  16 years agoPost 26
kaltman

rrApprentice

Norway

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To Heli4
I will not try to change your mind about 30 CP becouse I love it in my OS60 With Bennet and Shadel setups, but as I said I run the 90 on 12,5 and its very good!! I also use the Hyper Head!
So I think the 12,5 is a better fuel than 15!
A friend of me put a YS80 in his Freya and started up with 15% CP
and the engine was not happy! And he tried another fuel similar to 12,5 and you should see this Heli Fly
We have experied also that on a Futura you actualy need blades as long as 71 to get the power right ( this is not my test)
On my Freia WC I use standard 68 and that is nearly the same!
Yoy actaualy need load to get it right
and that is different from helitype to Helitype!!
Due to difference in mecanic and so on!!!!!!!!!
I am not a good pilot, but I know howe to tune a heli good
That i actually my Hobby
I have just now completed building a Sylphide and I am still waiting for a Hyper head for this one also! So if you know anyone ha has one I will be happy to by it!!

Best reg Kaltman

I realy miss Kalt Helies

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07-19-2002 12:59 AM  16 years agoPost 27
heli4me

rrNovice

Springfield MO.

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EHAB
The cost of $2-3 extra for the 30% pales to compare with $1500-2000 helis that we sick people fly
I think that says it all

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07-19-2002 01:02 AM  16 years agoPost 28
Wildcat Fuels

rrApprentice

Lexington, Ky

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OS 91
FlyingFreak,

Try going to a 20% fuel. You will find the power almost the same and the helicopter will become "very smooth". The OS 91 was not designed around high nitro, such as 30%, and actually overcompresses on that high a nitro %, most people running that setup having to add head shims to defeat this problem. This also holds true for the YS series motors that work much better on 20%.

Jerry

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07-19-2002 03:10 AM  16 years agoPost 29
Rotor

rrKey Veteran

Springfield, MO USA

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Amen, EHAB couldn't have said it better myself!!!
Read and weep Heli4me for you have crossed over to the dark side, the CP 30% side and there is NO Returning!!!! heheheheh...

My motto is this..Fly...Rebuild...Fly

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07-19-2002 10:51 AM  16 years agoPost 30
Eagle

rrApprentice

Australia

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Secret Squirrel, are you running the blue coolpower oil?

Also what head speed are you running?

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07-19-2002 10:59 AM  16 years agoPost 31
Secret Squirrel

rrKey Veteran

New Zealander living in Melbourne, Australia

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Yup, coolpower blue.
Running about 1600 for hovering, 1750-1800 for aeros.

-------------
Simon Lockington

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HomeAircraftHelicopterHelicopter Main Discussion › What fuel % do you use for your OS91
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