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HomeAircraftHelicopterHelicopter Main Discussion › throttle curve
03-28-2015 02:51 AM  3 years agoPost 1
helidad3

rrNovice

richmond virginia

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why are throttle hold numbers negative -10 to cut engine off -5 idles well rap 90 spectrum 6040 x 4 rev max gy 502 fut 256 jr 9503

i fly two mistakes high

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03-28-2015 03:10 AM  3 years agoPost 2
McKrackin

rrProfessor

Lucasville,Ohio

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The servo arm is misplaced.
Needs turned a tooth or two on the servo pinion shaft.

I literally never use the word literally right.

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03-28-2015 03:18 AM  3 years agoPost 3
McKrackin

rrProfessor

Lucasville,Ohio

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Set your throttle to 50% and install the servo horn to hold the carb at 50% throttle.

Start this set up at 0% throttle trim.

Set your end points at about 50% and increase them in each direction until the carb is wide open at a higher % and closed at the lower %.

Now it should idle at 50% trim and 0% throttle.

You might need a negative number in throttle cut to kill it.
Throttle hold should idle at a 0% flat curve with trim at 50%

My throttle hold was a fast idle at 5% for autos.
I started it with throttle hold off.
This was a personal preference. Not really recommended.

I literally never use the word literally right.

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03-28-2015 04:25 AM  3 years agoPost 4
Jerry K

rrKey Veteran

Houston Area

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They are just numbers, I am not going to say they don't mean anything but in reality they don't. They are there for a reference. You cannot compare your numbers to someone elses because there are 2 seporate setups and the numbers do not relate. So they are meaningless except for your setup.

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03-28-2015 04:38 AM  3 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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McKrackin nailed it. Bad throttle servo/carb arm setup.

A different method than described by McK, but this works, too.

Your carb usually has a throttle stop screw. Turning this screw in or out limits just how far closed the throttle barrel/venturi is, when the throttle arm is pulled to the minimum throttle position.

Peek down inside the venturi, adjust that throttle stop screw such that the opening in the venturi JUST closes off at low throttle.

If you then make the low throttle/low throttle trim setting such that the throttle servo closes down the carb without stalling, and such that full throttle opens the barrel all the way, again without stalling the servo, you'll have your high and low throttle endpoints set well. And this usually ends up with half throttle also being where the carb barrel is about half closed as well.

I've found with this setup, at low throttle and low trim, the motor won't start, and won't run. It makes a good kill switch.

At low throttle and mid-trim, the motor will usually start and idle reliably, below the clutch engagement RPM.

At low throttle and full trim, the motor RPM increases to the point where your clutch engages and the head begins to spool up.

I then also will follow up the throttle hold setting so that when I'm in the low throttle/mid trim setting (motor idles well, but the clutch is not engaged) and switch on throttle hold, the servo doesn't move. Fine tune at the field.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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03-29-2015 03:04 AM  3 years agoPost 6
helidad3

rrNovice

richmond virginia

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throttle curve
thank all of you got it moved servo few spines end pts 100/102 best i could get idles well at 5% cuts off -7%

i fly two mistakes high

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03-29-2015 03:29 AM  3 years agoPost 7
McKrackin

rrProfessor

Lucasville,Ohio

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That's just about perfect

I literally never use the word literally right.

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