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HomeAircraftHelicopterHelicopter Main Discussion › normal mode throttle curves for electric & nitro the differences discussion
10-25-2014 03:24 AM  3 years agoPost 21
dela

rrApprentice

Stillwater Oklahoma

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Been a heli pilot for 13 years. I burn roughly 3 to 4 gallons of fuel
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per year. You can imagine how well I fly!

Ron D

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10-25-2014 03:32 AM  3 years agoPost 22
wc_wickedclown (RIP)

rrProfessor

long beach calif

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dela
Been a heli pilot for 13 years. I burn roughly 3 to 4 gallons of fuel
i could tell you are experienced pilot

you know your stuff

but i never imagined 13 yrs impressive and a pleasure to have your acquaintance sir.

Insha Allah made in america

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10-25-2014 03:34 AM  3 years agoPost 23
dela

rrApprentice

Stillwater Oklahoma

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Quick summary on the original question:

A flat throttle curve in a Nitro heli will give major changes in head speed as pitch is changed. Nitro throttle curve numbers control POWER (throttle setting), not speed.

A linear throttle curve in a E-heli will give major changes in head speed as pitch is changed. E-heli throttle curve numbers control SPEED, not power.

On both, power need increases with PITCH.

Ron D.

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10-25-2014 10:37 PM  3 years agoPost 24
wc_wickedclown (RIP)

rrProfessor

long beach calif

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dela
Quick summary on the original question:
A flat throttle curve in a Nitro heli will give major changes in head speed as pitch is changed. Nitro throttle curve numbers control POWER (throttle setting), not speed.
A linear throttle curve in a E-heli will give major changes in head speed as pitch is changed. E-heli throttle curve numbers control SPEED, not power.
On both, power need increases with PITCH
thanks ron that about sums it up for me i always wondered why nitros without a gov use v curves

Insha Allah made in america

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10-26-2014 03:54 AM  3 years agoPost 25
wc_wickedclown (RIP)

rrProfessor

long beach calif

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dela
would you ever use a linear curve ? on e or n

Insha Allah made in america

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10-26-2014 05:03 AM  3 years agoPost 26
dela

rrApprentice

Stillwater Oklahoma

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Here's what I think. Unless you are taking off or landing, the "holy grail" of heli power is constant head speed.

On a nitro, the best way to do that is a governor. Throttle curves are second best. A good throttle curve gives excellent speed control when the heli is upright with positive pitch (above half throttle). When the pitch goes negative, v-shaped throttle curves overspeed.

The governor makes throttle curves mostly irrelevant. I think people who use governors on nitro's setup a usable throttle curve in case the gov dies. A linear curve there might be ok for emergencies.

You could use a linear throttle curve, combined with a non-linear pitch curve, and achieve roughly the same result. That's not what I do.

It is highly unlikely that linear pitch and linear throttle curves together would give a constant head speed. That hasn't happened on any heli I have owned.

With electric motors, a flat throttle curve (constant input to the speed controller) would give nearly a constant head speed, if the battery voltage didn't drop with high current (amperage). A slight V shaped throttle curve can help maintain UNIFORM head speed at any instant. Of course as the battery power is consumed, the voltage heads down during the flight, so the headspeed drops slowly. A speed controller with a governor can compensate for both effects and keep the head speed fairly constant ... up to a point.

On and electric heli, a 0 to 100 linear curve will change the head speed every time you move the throttle stick. Nowhere near constant head speed!

Remember, on an e-heli (without a governor) throttle setting controls the speed (roughly). On a nitro heli, throttle setting controls power (roughly).

So, for different reasons, it is UNLIKELY that I would ever use a linear curve on either type of heli.

Ron D

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10-26-2014 05:08 AM  3 years agoPost 27
wc_wickedclown (RIP)

rrProfessor

long beach calif

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So, for different reasons, it is UNLIKELY that I would use a linear curve on either type of heli.
+1

thank you for the best throttle curves lesson i have ever received.

i mean the absolute best

Insha Allah made in america

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10-26-2014 08:14 AM  3 years agoPost 28
Einzelganger

rrKey Veteran

Campbell, Texas

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I love the smell of nitro in the morning.
RIP Roman

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10-26-2014 01:52 PM  3 years agoPost 29
rcnut

rrElite Veteran

Rockford, Illinois

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i run govs on both my nitros
this might be a mighty dumb question do i need to run a 3d v curve for a nitro that has a gov ? my gov are programmed with a set rpm
WC, I run a governor as well. It is recommended to set some type of "curve" in your radio for throttle…for the different flight modes. If not, there seems to be a conflict with the radio setting and governor.

The governor has a "turn on / turn off" setting (15-25%) based on the manufacturer. Example; if you left idle 2 throttle settings in the radio to a straight line (0, 25, 50, 75, 100) and set a head speed of 2200 rpm in the governor, as long as you are above 30% throttle, the governor will work without any problems. However, dropping below 25-30% presents a conflict with the governor. As the governor thinks it needs to shut off due to the low throttle setting of position #2 equaling 25% instead of 75%.

And the second reason for having a throttle curve in your radio… Should the governor fail, for some reason, you won't loose all of your head speed suddenly. Imagine cutting grass inverted in front of many people. They are cheering you on. And all of a sudden…the governor quits! Your throttle setting in the radio is a straight line, so your head speed drops close to idle…almost like throttle hold.

But you are inverted cutting grass, digging dirt! By the time you realize what has happened, you lose half the head speed. So now you are down to 1100 rpm? Your brain will need to process quickly to perform a flip to right side up! You will burn most of the 1100 rpm's by the time the heli is vertical and crash as it flips around on the skids.

So it is important to have a throttle curve closely related to the head speed you want/need. To properly set a governor up…you need to test fly your heli without the governor first, then turn the governor on and set it to the same head speed.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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10-26-2014 05:19 PM  3 years agoPost 30
wc_wickedclown (RIP)

rrProfessor

long beach calif

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So it is important to have a throttle curve closely related to the head speed you want/need. To properly set a governor up…you need to test fly your heli without the governor first, then turn the governor on and set it to the same head speed.
i am forget full

you are exactly right .

thank you
Einzelganger
i see you are highly experienced with nitros as well thank you for your input

Insha Allah made in america

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HomeAircraftHelicopterHelicopter Main Discussion › normal mode throttle curves for electric & nitro the differences discussion
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