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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityAirstar › Throttle curve for Mongoose
11-10-2013 04:36 AM  4 years agoPost 1
OneHoof

rrApprentice

Cold Spring, Kentucky

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What is a good starting throttle curve for an Airstar Mongoose with Futaba 10C radio.

It has 813 mm Edge blades and Zenoah G270 engine. I am hoping for a headspeed around 1350.

This Futaba radio has 7 points to set on both throttle curve and pitch curve.

Thanks.

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11-10-2013 10:28 AM  4 years agoPost 2
mcfast

rrKey Veteran

Quebec Quebec Canada

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There are two ways of do a throttle curve on a gasser one is mechanical like this

https://rc.runryder.com/r...45896&PG=1&IN=1

And keep a straight line in the radio

Or a normal mechanical set-up and numbers like this in your radio

N throttle curve = 0,23,25,27,38,50,100
ID1 = 100,50,38,27,38,50,100
ID2 = 100,80,65,50,65,80,100

P.S. sorry for the spelling or the grammar I am dyslexic!

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11-10-2013 08:31 PM  4 years agoPost 3
OneHoof

rrApprentice

Cold Spring, Kentucky

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Before, it would hover well below half stick! When I would descend out of a high hover from filming video or taking pics the engine rpm's would get to low and rotor rpm's would droop and I'd have to throttle back up to keep from hitting the ground to stop the descent.

I tweaked them a bit, but engine sounded like rpm's were too high, so I landed right away and reduced them.
But heli has a wobble in it, which may indicate the rpm's are too low.

The Army movers took some of my field equipment; so I don'thave my tachometer to figure out my rpm's.
I will order one this week when I get paid. I think the Mongoose likes around 1200 or 1350 on rpm's.

Thanks for your help. I will test fly with these numbers.
I currently have pitch set at -6, +6 and +11 degrees of pitch. Helicopter does not come off the ground as fast, and rpm's seem too high on both engine and rotors.

Charles

This is how the servo is set up on my Mongoose. Forward is full throttle and all the way back is idle.

My Airstar Mongoose has the carb and throttle sevo on the left side, so it is facing like this.

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11-10-2013 08:48 PM  4 years agoPost 4
OneHoof

rrApprentice

Cold Spring, Kentucky

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I was always told with a gasser the throttle curve should look like a hockey stick, low and flat at the bottom, then curving up a lot above mid stick.

Anyway, that is what I read in RC Heli magazine recently.

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11-10-2013 09:45 PM  4 years agoPost 5
mcfast

rrKey Veteran

Quebec Quebec Canada

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(I was always told with a gasser the throttle curve should look like a hockey stick,)

It is, thats with a standard throttle servo set-up, like a nito,
it should look something like this

(N throttle curve = 0,23,25,27,38,50,100)

But if you do a mechanical set-up like this

https://rc.runryder.com/rr/rrpv.htm?ID=751349&PG=1&IN=1

You can keep it close to a straight line like a nitro

Its up to you, with one you like the most! I have tried it both ways and it is easier with a non linear mechanical set-up, to get a nice linear throttle curve (straighter line in the radio)

P.S. sorry for the spelling or the grammar I am dyslexic!

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