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HomeAircraftHelicopterMain Discussion › Throttle curve setup up
03-13-2010 10:09 AM  8 years agoPost 1
jwmachon

rrNovice

UK

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My my heli is a raptor 30 v2.
TT 39 Engine

Pitch set at

-3 + 4 + 9

Based on above what should my throttle curve look like as a starting point i thought

0,50,65,75,90

Dont want heli to drop like a bullet so i have to put loads of power on which is currently causing my tail to kick right, nose left when catching heli when landing and when doing punch outs.

Only fly in rate mode not hh mode

Many Thanks,

Jonny

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03-13-2010 11:50 AM  8 years agoPost 2
Breitenstein

rrApprentice

Denmark (Scandinavia)

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You should only use "Normal mode" to start the motor and spool up, and fly in "Idle-Up 1".

Set the pitchcurve in "Idle-Up 1" to the same settings as in "Normal mode", and set the throttle curve like this: 60,50,65,75,100.

You may have to correct the low point a little, to achieve steady rotorrpm's over the entire throttle/pitch range.

You should also set the max throttle point to 100 instead of 90 in "Normal mode".

Jens

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03-13-2010 12:18 PM  8 years agoPost 3
jwmachon

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UK

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so 60,50,65,75,100

is ok with my pitch setup

of -3 +4 +9

Also isnt 60 a bit high for starting engine wont blades try to spin or do a lower the 60 until i get a nice idle where blades just start to move

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03-13-2010 12:39 PM  8 years agoPost 4
airdodger

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Johnston USA

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Use normal for starting engine, when ready to fly switch to idle up 1, don't start the heli in idle 1.

Chris

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03-13-2010 12:45 PM  8 years agoPost 5
Gyronut

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Martinsville In.

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Set your Th curve from 0 to 100 and your pitch from -3 to 9 as you had it.

You are also going to have to set your REVO mixing up to keep your tail straight during throttle transitions.

Rick

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03-13-2010 02:28 PM  8 years agoPost 6
Breitenstein

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Denmark (Scandinavia)

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As Airdodger says: Start the motor in normal mode, and then switch to Idle-up1 when you are ready to take off and fly.

DO NOT START THE ENGINE IN IDLE-UP1 !!!

In normal mode your throttle curve have to be 0,50,65,75,100.
(Your' current setting is 0,50,65,75,90).

When you start the motor in normal mode the rotor won't spin, because the motor will be idling.

The idea with the Idle-up1 setting: 60,50,65,75,100 is to achieve the same rotor rpms (eks. 1800 rpm) over the entire pitch range.
This will make the helicopter more smooth to fly, which is quite important, especially during descent and landing.
You will get the feeling that the helicopter is easier to fly.

As Gyronaut says, you will also have to set up REVO mixing, to prevent the tail from kicking when you apply pitch/throttle, because this creates more torque, and forces the helicopter to turn around its vertical axis.

Jens

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03-13-2010 02:59 PM  8 years agoPost 7
jwmachon

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UK

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im hoping with a more flat throttle curve now i wont need to use revo mix only reason it was kicking out before was the headspeed was dropping so much at lower throttle

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03-13-2010 03:10 PM  8 years agoPost 8
Zaneman007

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Texas - USA

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The pitch curve should be zero "0" degrees at mid stick.
-4 at the bottom looks good and 9 at the top looks OK in normal mode with a linear throttle curve starting at 0 and going to 95.

In IDL1, I would recommend -9-0-9 pitch and 95 50 95 throttle which will require some tweaking depending on rpms achieved.

My recommendation to set mid stick to zero is that when you advance and start flipping between IDL modes, the heli will not jump when you flip the IDL switch. In addition, this also helps on set up. By setting your sticks at 50% of full throw, you know that your blades should be at "0" pitch, else you will need to do a calculation to set up your heli.

I would say that your "drop like a bullet" issues are related to having "0" percent throttle on your lower point curve in IDL1. You want to start with zero throttle in normal, but when you switch to IDL1, you want constant power and rpms, in both the positive and negative ranges. Thus -4 and positive 4 should be at the same point in the throttle curve. The curve should look somewhat like a "V". What you are effectively doing is cutting your power off, while you are flying. (not a good idea).
And as you have noted, it creates issues.

Old Guys Rule!

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03-13-2010 03:32 PM  8 years agoPost 9
jwmachon

rrNovice

UK

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suppose this is where a governor would make things a hell of alot easier is there any out there where u dont need a tacho, also how do u find out ur gear raio

Cheers guys thanks for all ur help

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03-13-2010 03:48 PM  8 years agoPost 10
jwmachon

rrNovice

UK

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so if i have throttle mid stick at 0 degrees would it look like this

Throttle - 50,50,65,75,100

Pitch - -4,0,+9

Thanks

DONT FEEL READY TO FLY -9 0 +9. Only doing circuits and firgure of 8's at the moment

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03-13-2010 03:54 PM  8 years agoPost 11
Zaneman007

rrElite Veteran

Texas - USA

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Setting the throttle to the pitch isn't easy.

Ideally you would set the max throttle curve to more like 85%, then throw in some mixes so that when you input some cyclic pitch you would also throw in some more throttle. Rays authoritative vid does a good job of explaining how to set up a manual throttle curve. Regardless you will need a tach.

Now, if you are leaning toward a governor, I'd recommend the multigov. No "percentages" to learn and no Tach required. You input the gear ratio and the desired head speed. The multigov does the rest. We tached it years ago when it first came out, and it was spot on. Although I do not own a tach, I can tell you what my head speed is.

Old Guys Rule!

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03-14-2010 10:51 AM  8 years agoPost 12
jwmachon

rrNovice

UK

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one question i have not asked when doing these curves which i have now done where should my throttle trim be

Thanks

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03-14-2010 04:09 PM  8 years agoPost 13
Zaneman007

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Texas - USA

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I have a jr radio. The throttle trim is manual. Set the trim all the way down, and set up the end points on the throttle. Now, when you push the trim switch to the middle. The throttle is set to idle the motor. Pushing the throttle all the way down should close the carb all the way and shut the throttle off.

Futaba radios are different. They have a kill switch.

Old Guys Rule!

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03-15-2010 11:54 AM  8 years agoPost 14
jwmachon

rrNovice

UK

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could it have anything to do with the Spektrum DS821 servo not been fast enough or not

Thanks

Jonny

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03-15-2010 06:00 PM  8 years agoPost 15
Zaneman007

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Texas - USA

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I do not understand your question.

Old Guys Rule!

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03-15-2010 07:11 PM  8 years agoPost 16
broggyr

rrKey Veteran

Naugy, CT

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also how do u find out ur gear raio
You can find your gear ratio by counting the teeth on both the pinion gear and main gear, then dividing the smaller into the larger.

If your pinion has 16 teeth and your main gear has 95 teeth, your ratio would be 5.94 (95/16 = 5.9375).

- Brian
irony [ay-ruh-nee', ay-er-nee'] adj.: Like goldy or bronzy, but made of iron

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