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HomeAircraftHelicopterHelicopter Main Discussion › General question: what should be the headspeed for max power..
10-09-2012 03:53 AM  6 years agoPost 1
coolgabsi

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Plano TX

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Nitro engine - os 55hz
Gear ratio of bird 8.7

Rpm for engine to make power -- 17000

That means the headspeed of 1954

Now the question is with a governor , should I set headspeed right at 1954 (or 1950) or at 2000 so when I load it, power kicks in and when it's unloaded it still has good power and head speed.. Just wondering the principle and trying to understand engines with governors.

And how bad is it if I keep it at 2100 rpm and throw a tic toc at it with my collective at +-12 degrees?

Thanks yall!

People call me crash master... for a reason.. :P :D

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10-09-2012 04:15 AM  6 years agoPost 2
cudaboy_71

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sacramento, ca, u.s.

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IME you're not going to notice 4 RPMs. set it at 1950 and see how you like it. adjust in increments of 25-50 to taste.

if it ain't broke, break it.

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10-09-2012 05:00 AM  6 years agoPost 3
Volcano

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chicago

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its hard to say, theres headspeed, and theres torque. Is the motor strong enough to not bog with the pinion? Im unfamiliar with nitro.
whats the gov?

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10-09-2012 08:47 AM  6 years agoPost 4
coolgabsi

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Plano TX

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I m using multigov pro for governor

I wasn't really concerned about 1950-1954 change but 1950-2000-2100 change

I can go in increments but I was wondering the rule of thumb scenario if there is any..

People call me crash master... for a reason.. :P :D

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10-09-2012 11:34 AM  6 years agoPost 5
Jeff polisena

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westpalmbeachflorida usa

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I've found that 1910/1920 is the sweet spot . 2000 is more pop but by the time motor catches up your out of power band . If you are doing slow transitions at 2000 motor will recover but when you get faster motor will fall behind .this can differ on tuning and fuel .

I stole it ,flew it and gave it back ;)

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10-09-2012 11:58 AM  6 years agoPost 6
Peter Wales

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Orlando Fl

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If it is possible, you need to look at the power curve for your motor. It should ideally be run at slightly ABOVE peak power. Then, when you load up your engine it drops in to a higher power level and will not drop its rpm and thus head speed, so dramatically.

This depends on the extra loading you put on it of course, and if you load it enough there will not be enough increase in power to stop the head speed decaying and the engine slowing down through peak power and getting onto the down slope of the power curve.

The other factor to consider is the inertia of the rotor head and the higher the rpm the better it will be able to cope with changes in load.

Peter Wales
http://scalehelicopters.org

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10-09-2012 12:38 PM  6 years agoPost 7
coolgabsi

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Plano TX

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Ill look for the curve.. But like you said I was going by a similar train of thought that my rpm will decay on putting load and at a point my engine's power will kick in as soon as I hit say 1950 from 2000 or 2100. And that'll stop the rpm decay cause I have enough power to pull it and when I recover I come back on high rpm...

I'll look around.. But what or how do you set yours?

People call me crash master... for a reason.. :P :D

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10-09-2012 03:14 PM  6 years agoPost 8
rudyy

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E. Amherst, NY

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Now the question is with a governor , should I set headspeed right at 1954 (or 1950) or at 2000 so when I load it, power kicks in and when it's unloaded it still has good power and head speed.. Just wondering the principle and trying to understand engines with governors.

And how bad is it if I keep it at 2100 rpm and throw a tic toc at it with my collective at +-12 degrees?
Why not you just experiement it yourself and find the sweetspot you like? Different people will have different opinion and preference. Some will say ok and some will not. You will never get one single answer.

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10-09-2012 05:02 PM  6 years agoPost 9
cbflys

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Nesconset, NY - USA

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What Peter Wales said ...

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10-09-2012 05:10 PM  6 years agoPost 10
coolgabsi

rrApprentice

Plano TX

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Why not you just experiement it yourself and find the sweetspot you like? Different people will have different opinion and preference. Some will say ok and some will not. You will never get one single answer.
:P I like to get these comments. SO I know what to try . And whats my limit.

So what do you think?

People call me crash master... for a reason.. :P :D

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