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HelicopterEngines Plugs Mufflers Fuel › Fuel hysteria! 12.5%, 15%, 30%?!?
03-14-2003 09:28 AM  14 years agoPost 1
sultan68

rrApprentice

Broomfield, CO​Elevation 5420'

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I recently finished my first helicopter, a Raptor 30v2 and bought some 12.5% Cool Power. A few weeks later I found some 15% Cool Power. I decided to run the 15% to break it in and it seems like great fuel. I like it alot!

How do I know what percentage I want to run? I have an OS32 in my Raptor and have heard that 30% with it's higher nitromethane content is the best to run overall. I also heard that if you break in the engine with 15% it won't run as well on 30%. i.e. it will develop less power in the long run.

Now I am almost out of the 15% and have the 12.5% still left over that I haven't used yet. Should I use this fuel next? Realize the 15% is the first gallon EVER in that engine. So the 12.5% would be next. Or should I go buy some more 15%? Some 30%??? Why would I want the different percentages and how would I know?

HELP!

Thanks in advance,
Chris
AMA 769606

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03-14-2003 10:54 AM  14 years agoPost 2
psawya

rrKey Veteran

Woodinville, WA

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15% is a good all around fuel. No offense intended here, but if you have to ask if you need 30%, you probably don't need it. Until your flying ability is at the level that you know the 15% is not enough power for you, you are only wasting money on 30%. Fly the 15% and lots of it, then when the time comes move up to 30% if you feel the need to.

Pete

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03-14-2003 12:39 PM  14 years agoPost 3
SteveH

rrProfessor

Texas

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I agree with Pete, if you are satisfied with the power on 15%, use it. I have a 32 and two 50's and they all run fine on 15% with adequate power. The 30% fuel costs more and your engine will consume more of it, but it will give you more power.

SteveH

The government cannot give you anything without first taking it from someone else.

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03-14-2003 12:50 PM  14 years agoPost 4
JFL

rrNovice

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I also agree with Pete…But when you start cutting up upstairs you will need the CP30% at that altitude.

Jim

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03-14-2003 04:19 PM  14 years agoPost 5
89X-CELL60

rrNovice

Queen Creek, AZ

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Don't waste your money

Hello Chris,

I live in Colorado and have never seen the need to go for more than 15% CP. I have run 32's, 28's, 46, 50, and 61's on 12.5 or 15%. If you want to see some incredible vertical you should see my 14-year-old "bent" frame X-Cell 61 on 15% CP

I would burn the rest of your 15 AND 12.5 then stick with the 15%, your engine will be fine. Just make sure you keep it on the rich side.

It is up to you, but 30% is a BIG waste of money at your stage of flying. Compensating good throttle to pitch curves for higher nitro is not the way to fly at higher altitudes.

MY $.02
David

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03-14-2003 05:59 PM  14 years agoPost 6
sultan68

rrApprentice

Broomfield, CO​Elevation 5420'

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Break-in question

Thanks for all the helpful information. And psawya, no offense taken. You are right. I don't need it just yet...

However, is running these lower grades in ANY WAY going to effect the overall break-in of my new motor? I had heard it would and was wondering. I don't want to permanently hinder the future performance when I need it!

Thanks,
Chris
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03-14-2003 06:27 PM  14 years agoPost 7
SteveH

rrProfessor

Texas

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Chris,

The nitro content of the fuel will in no way effect the breakin procedure, and if anything, it would be better to breakin with low nitro fuel as it puts less stress on the engine.

Nitro is an oxygenator and doesn't even burn, and it does not lubricate. It acts like turbo charging or supercharger or like nitrosoxide in a four cycle automotive engine. It makes the engine take a deaper breath with every revolution and makes the engine act like it is bigger displacement.

Hope this helps.
SteveH

The government cannot give you anything without first taking it from someone else.

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03-14-2003 06:44 PM  14 years agoPost 8
sharam

rrElite Veteran

Northern California​- Fly at Morgan Hill​Field

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Stick with low niitro if you are happy. I run Webra engines mostly and they are awesome on 5%. The cost difference is $12.95 per gallon for 5% vs. about $24.95 for 30% nitro.

Adds up if you fly a gallon a week.

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03-15-2003 10:32 AM  14 years agoPost 9
lasnubes

rrNovice

Tampa, FL

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I agree

I would also recommend working on a good set of curves before adding nitro. The .32 actually hovers better on 15% rather than 30%. When you get to where you are using everything and need more, consider switching.

Good Luck!

Carl

No more nitro!

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03-15-2003 07:03 PM  14 years agoPost 10
gjestico

rrApprentice

Vancouver, B.C.

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Nitro is a fuel and can burn. It is a fuel that carries its own oxygen so it can be run at very rich mixtures. Also why it can become explosive in liquid state under the right conditions.
Just watch an NHRA Drag race Fueler go down the track. They burn ~5 gals of 95% nitro in 4.5 secs. Air fuel ratios of less than 1:1. On the edge of hydrolocking due to all the fuel in the engine.

Greg

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