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HelicopterEngines Plugs Mufflers Fuel › Went from CP 20% to CP 12.5% - help, C-Spec
06-04-2004 08:58 AM  13 years agoPost 1
Kristjan

rrApprentice

Estonia, Tallinn

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I had 2 gallons of CP 20% through OS91 C-Spec.
Main needle was 2 turns, middle needle was 1 turn and idle was in the centre. Basically everything was by the book and it had plenty of power and not once did I have any sort of problems.

Now I went from 20% to 12.5% (Special Heli fuel) and I can`t figure out wich way to turn the needles.
Main needle is 1.6 turns open now, middle is 0.75 turns and idle I didn`t touch at all.
At first it seems to be good but when I add some pitch it starts to loose power. I mean at hovering it is OK but when I enter forward flight or constantly keep at +6...+9 degrees the engine lacks power.

When I try to run the engine with exactly the same needle settings I ran with 20% it is very rich and engine tries to die when throttle is given.
I know that the main needle should be closed a bit but already I have closed it almost half a turn...

It would be great if someone runs the same fuel with the same engine and tell me the needle settings. Then I could copy them and just fine tune with some clicks.

Any suggestions are welcome.

Thanks,
Kristjan

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06-05-2004 10:23 PM  13 years agoPost 2
Kristjan

rrApprentice

Estonia, Tallinn

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As I said I had 2 turns on main needle with 20% Cool Power.
Now I have 1.5 turns with 12.5% Cool Power. Middle needle before was exactly 1 turn open, now 0.75 turns.

Is this normal? I had 3 tanks with Millennium today. Seems to get good power already but come on... is it really necessary to close main needle half a turn or is there something I`m missing.

K.

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06-10-2004 02:11 PM  13 years agoPost 3
Johnny_0

rrApprentice

Novara - Italy

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Hello,

With Coolpower 15% i fly with 1 turn (max needle) and 0.75 med needle.

Carlo

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06-10-2004 02:44 PM  13 years agoPost 4
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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Any time that you cut down on the nitro content of your fuel, you will have to lean the engine. You may have to lean it more than you think you should.

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HelicopterEngines Plugs Mufflers Fuel › Went from CP 20% to CP 12.5% - help, C-Spec
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