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HelicopterMain Discussion › why do people use v throttle curves on electric helicopters ?
02-22-2014 07:05 PM  3 years agoPost 1
wc_wickedclown (RIP)

rrProfessor

long beach calif

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ive always thought v curves where for nitro choppers

everyone know the gyro works best with a consistent head speed so why
use v curves which might cause tail blow outs on electric ?

please someone school me

Insha Allah made in america

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02-22-2014 07:12 PM  3 years agoPost 2
ChristianM

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Oslo, Norway

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Well in short, a V throttle curve will keep a more constant head speed than a flat throttle curve. Just like a nitro engine the RPM on an electric will decay when you load it up, just less. The reason some started using flat 100% curves is that the ESC is slighly more efficient at 100% than at something less but there are other factors (like head speed) that come into play.

Christian

Burn fuel, be happy

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02-22-2014 07:15 PM  3 years agoPost 3
DemetriusUSN

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Virginia Beach, Va USA

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This is how it was explained to me. If you're not using gov mode in your ESC or FBL unit, you need it to get bird from bogging, especially in the bigger helis. Im quite sure you will get a very technical answer but that's the short and sweet.

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02-22-2014 07:58 PM  3 years agoPost 4
wc_wickedclown (RIP)

rrProfessor

long beach calif

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ChristianM

Well in short, a V throttle curve will keep a more constant head speed than a flat throttle curve.
how is the head speed more consistent with a vcurve when the rpms are changing on a e model.

we are talking e right ?
DemetriusUSN

This is how it was explained to me. If you're not using gov mode in your ESC or FBL unit, you need it to get bird from bogging, especially in the bigger helis. Im quite sure you will get a very technical answer but that's the short and sweet.
on my helis that dont have a gov i use a flat curve the same as i would get from using a gov flat

a gov might not work properly with a v curve ?

Insha Allah made in america

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02-22-2014 08:09 PM  3 years agoPost 5
doug p

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blaine mn USA

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At zero pitch there's no load so the motor will rev more freely.
at full pitch there's more load so the motor works harder so you need more fuel, Hence v curve

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02-22-2014 08:30 PM  3 years agoPost 6
wc_wickedclown (RIP)

rrProfessor

long beach calif

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doug p
At zero pitch there's no load so the motor will rev more freely.
at full pitch there's more load so the motor works harder so you need more fuel, Hence v curve
im getting the picture thank you

Insha Allah made in america

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02-22-2014 08:40 PM  3 years agoPost 7
dumbthumb75

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Oslo, Norway

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I've only got experience with Jive's; Only flatline throttle% in tx and let the governor do the governing..

With v-curves in tx, the governor will not be able to hold a desired headspeed because you are giving it different throttle values when you move the stick.

Any flatline throttle% in tx, un-governed, means that headspeed will vary with load. Goes for boh IC and E.

The whole point of v-curves is to get the most consistent headspeed as possible, throughout your flight envelope.

However, any (good) governor will always do a better job than v-curves.

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02-22-2014 08:50 PM  3 years agoPost 8
icanfly

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ontario

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on a cp heli you want hover rpm lower throttle and wide open throttle at full pitch and on pitch pumps, like a peddle to the metal approach nitro or e.

The V is for stunt modes.

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02-22-2014 09:09 PM  3 years agoPost 9
AirWolfRC

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42½ N, 83½ W

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In Idle-Up a V curve is typical for a non-governed motor so you can still have full throttle while inverted. If you have a head speed governing function, you just need to keep the throttle above the minimum setting to keep the governor engaged and the governor will control the head speed. To disengage the governor, just switch to normal throttle curve and reduce throttle below governor minimum setting.

It can be a good idea to keep the V curve even with a governor so if the governor quits governing, you still have some kind of throttle curve.

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02-22-2014 10:54 PM  3 years agoPost 10
fenderstrat

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Aston,Pa

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I run my electrics un goverened with a "V" curve.The reason I used quotes on the V is that they are really shallow V's.They typically are not anywhere near as steep as a nitro curve.

As said they help keep a consistent headspeed.In flight you almost never have the heli held with say, -3 to +3 deg of pitch.You are usually moving through this area while transitioning.So there is no need to have the throttle at 100% while passing by 0 pitch

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02-23-2014 07:02 AM  3 years agoPost 11
wc_wickedclown (RIP)

rrProfessor

long beach calif

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AirWolfRC
In Idle-Up a V curve is typical for a non-governed motor
just what i thought thanks
fenderstrat
I run my electrics un goverened with a "V" curve.The reason I used quotes on the V is that they are really shallow V's.They typically are not anywhere near as steep as a nitro curve.
As said they help keep a consistent headspeed.In flight you almost never have the heli held with say, -3 to +3 deg of pitch.You are usually moving through this area while transitioning.So there is no need to have the throttle at 100% while passing by 0 pitch
dumbthumb75
icanfly
thank you

Insha Allah made in america

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02-23-2014 04:40 PM  3 years agoPost 12
es1co2bar3

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winnetka california

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V curve for me is to conserve power since there's no pitch at center.
if you don't have governor a flat curve is needed, not always but will help incase your bogging on the head.

I was waiting on some honey but there aren't no Queen bee,

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02-23-2014 04:43 PM  3 years agoPost 13
Ronald Thomas

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Gainesville, Fl, USA

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That is exactly what a proactive governor does as well..

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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HelicopterMain Discussion › why do people use v throttle curves on electric helicopters ?
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