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03-28-2005 09:06 PM  13 years agoPost 1
Gianfrancesco

rrNovice

Viareggio, Italy

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I am using a Hacker C40-9L with LiPo 3s2p (4000 mAh) with constant Rpm. Do you know at what percentage of throttle curve I get 2000 Rpm. Or do you know at what Rpm I should set the curne?

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03-28-2005 09:42 PM  13 years agoPost 2
SBK

rrVeteran

NE Ohio

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What is your ESC and are you using Gov. mode or non-gov mode?

SBK

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03-28-2005 09:54 PM  13 years agoPost 3
CustomPC

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Sydney, NSW - Australia

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I like to keep my governor on a flat throttle curve at 95%. Some people prefer 85%, some like 100%.

Anyways, according to the KC Spreadsheet, with the throttle curve/governor at 95% the 16T pinion shoud give 1940rpm and the 17T should give you 2060rpm.

On the 16T, 5% throttle is close to 100rpm.

My personal experience is that the my measured figures are slightly higher than the spreadsheet prediction so you may find that the 16T will give you 2000rpm at 95%.

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03-29-2005 01:07 AM  13 years agoPost 4
SBK

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NE Ohio

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If you are using governor mode, you'll need to find out what % on your throttle curve gives you the max headspeed at the rotor head.

For instance, in my Logo 10, 83% on my throttle curve gives me the max (100%) headspeed as tached at the rotor blades. Anything above 83% gives you the same max (100%) headspeed. 90% of 83% = 75% on my throttle curve. So, my Idle-up1 throttle curve is 75% across, which gives me 90% of the actual headspeed.

I use Futaba 9CH, and the method that I use to determine that percentage on the throttle curve which would give me max (100%) headspeed is to start with my throttle curve at 100%, spool up the heli on the bench, then gradually dial down the throttle curve until I hear the headspeed begins to decrease. That the point where the throttle curve gives you the max headspeed. As I said, in my Logo 10, it is 83% on my throttle curve which gives me the max (100%) headspeed tach'ed.

ESC's are most efficient in governor mode when runs at 100% of max headspeed (in my Logo 10, this means 83% on my throttle curve), but to leave some headroom, I choose 90% of the max headspeed for flying. This 90% of headspeed, in my Logo 10, is 75% on my throttle curve (90% of 83%).

Below 85% of max headspeed (= 70% on my throttle curve for my Logo 10) or so, ESC's become really inefficient and will heat up more.

So, first, determine what % on your throttle curve gives you the max (100%) headspeed as tach'ed. Then set up the rest of your throttle curve accordingly.

Hope this is not too confusing.

SBK

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03-29-2005 01:21 AM  13 years agoPost 5
CustomPC

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Sydney, NSW - Australia

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SBK,

I have a similar method.

If your ESC has an LED, it typically lights up when it sees 100% from the transmitter.
I check mine by disconnecting the motor and incrementing the throttle curve by one point until the LED lights up.
On my JR that is at 89% so i set my throttle curve at 84.5% for a True 95%.

I hope that makes sense.

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