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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › nitro mixture % and governor
10-24-2009 12:48 AM  8 years agoPost 1
siang

rrApprentice

auckland, new zealand

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Hi all,
Taught I'd lump these 2 question together, . I've alway seeking for answer to this 2 question. Presently, I fly with only 10% nitro and no governor. I haven't had the skill to fly 3D yet, mostly sports, simple loops, rolls, inverted hover, moving on to tic-tocs atm.

Question is most flyers I met, fly with 20% nitro and equipt with governor. Are they a must to venture into 3D?

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10-24-2009 12:58 AM  8 years agoPost 2
jackheli

rrProfessor

Vancouver - Canada

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Not at all!

GOVERNOR: If you have a good radio, program your curves well and mix some cyclic to throttle, then you will only feel a very slight over rev when unloading the blades. The governor will make setup more convenient, though...

I fly 15% which to me is enough for all my 3D.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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10-24-2009 02:59 PM  8 years agoPost 3
siang

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auckland, new zealand

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Thanks Jack.
I've tried using mixes before but that was when I experience motor bogging. It didn't help to solve the bog till I lower the max blade pitch to +/- 9. from +/- 12. Since then I've never had any issue with bogging.
When I had the mixes on, I experience hard and fast turn, tight loops and rolls, possibly from too much mixing. I'll look into mixing again, maybe increase pitch slightly as well.

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10-24-2009 03:09 PM  8 years agoPost 4
Aaron29

rrProfessor

USA

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In a word, no.

But you must have your throttle curves set up with good cyclic mixing to ensure you maintain headspeed without a governor. And you won't be able to do power on descents. You'd overspeed big time doing a rainbow.

But most maneuvers are loaded maneuvers and therefore the throttle curves work. Governors really are needed for unloaded type maneuvers to keep the headspeed down.

If you are bogging, try upping the cyclic to throttle mix or working on general collective management.

20% nitro is more powerful, and will help with stunts. But it is by no means necessary. I do lots of stunts on 15%.

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10-24-2009 03:20 PM  8 years agoPost 5
red_z06

rrProfessor

Dumont, NJ

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The lack of Gov will cause over rev while unloading like the other post said. Other than that, it is much more difficult to set rpm (although doable) and maintain it with climate changes.

For set rpm, you tune your mid point and 75% mark separately while using optical tach. Then you set the 25% mark while in inverted hover.
This sounds like no big deal but it will have to be redone with every needle change.

But with a decent price of Align 600 gov at around $50 range, it makes no sense to not have one and deal with constant TC tweaking.

But for ball park rpm setting, above setup needs to be only one time.

www.JustinJee.com

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10-24-2009 04:03 PM  8 years agoPost 6
w8qz

rrVeteran

Grand Rapids, MI - USA

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I can only comment on the nitro % - I've not seen a significant change in the power produced by the engine, going from 10% to 30% (what most of us Yanks fly in helis).

The biggest advantage in going to higher nitro is that your needle valve setting is less critical with higher nitro.

The disadvantages with higher nitro are that a) it costs more, and b) you have to run a richer needle setting, so that you don't get to fly as long on a given fuel tank size.

"The helicopter is much easier to design than the aeroplane, but is worthless when done."

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10-25-2009 11:34 PM  8 years agoPost 7
siang

rrApprentice

auckland, new zealand

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Thanks for all reply. Verdict ... guilty for not having a govr installed, . Not guilty for 10% nitro, ok for sports but better to upgrade to 15%.
Well I was hoping for miracle answer. Obviously a govr save the trouble, otherwise a complicated setting up.
Time to hunt for govr, just the basic one atm .
Thanks once again all

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10-26-2009 12:43 PM  8 years agoPost 8
tarzan_eb

rrApprentice

Central Illinois USA

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Gov
It doesn't matter how good of gov you have if you don't manage your collective you can bog it

Fly it ! Crash it ! Rebuild it ! Repeat as needed !! Everett

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10-26-2009 12:47 PM  8 years agoPost 9
tarzan_eb

rrApprentice

Central Illinois USA

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12 pitch
12 degree of pitch sounds high to me unless it's a 90. 9 degrees sounds closer to what you should be running no matter how much power you have you still have to manage your collective

Fly it ! Crash it ! Rebuild it ! Repeat as needed !! Everett

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11-18-2009 02:46 AM  8 years agoPost 10
siang

rrApprentice

auckland, new zealand

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Thnkas for info Tarz. Yea, I'm running at about 9-10 pitch now. Seems to be doing it's job. Got the govr and the 15% in anyway. Next'd be the collective management . thanks mate

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11-18-2009 04:43 AM  8 years agoPost 11
Roamer

rrVeteran

Albuquerque, NM

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One other thing to keep in mind: IF you are leaning out your engine to get more power from it, going with higher nitro will actually be easier on the engine and it will run cooler as you will get more power with a richer (relative to stoic for each fuel) mixture with the higher nitro fuel.

-RRRoamer

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