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HelicopterBeginners Corner › Throttle setting
11-25-2006 09:14 PM  11 years agoPost 1
McGyver59

rrNovice

Mo. USA

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I am still flying my trusted Shuttle ZX. I finally wore out the OS 32F. Put in a new 32SF got tons more power and I'm overspeeding the head at the proper pitch settings. I've cut the throttle ATV back so the carb is only open about 70% at high stick to get the head speed down. Should I richen the main mixture more and go back to 100% carb opening or what. It's been a long time since I've done a motor setup from scratch.

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11-25-2006 10:42 PM  11 years agoPost 2
gftazz

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upstate N.Y. in the Adirondacks

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NO, change your pitch settings not your throttle settings.

The motor is supposed to give you what it's got so it can be tuned properly don't change it change the PITCH!!

Yes you can richen it about 3-4 clicks and that will slow it a little bit and maybe prolong the breakin and it's life some BUT your ATV's should always stay the same, ATV's should be EQUAL if possiable on both ends, with the throttle trim all the way off or down. Then you should be at 100%-100% or slightly less on low throttle to then match up the necessary holes on the arms to give full range equally matched low and high.

Now when you go to HOVER depending on your throttle curve where the hover point is at, either 1/2 or 3/4 stick, you should be at about HALF throttle. To slow down the headspeed ADD PITCH and it will load the motor and lower the rpm.

You can use the THROTTLE CURVES only not the THROTTLE ATV to change the rpm BUT the correct way is to change the PITCH CURVES to give the load on the engine to reach the headspeed you want.

If you add pitch it will go down in rpm, if you take away pitch it will speed up and become more lively. Then match the pitch on the rest of the throttle points to maintain the head rpm and at FULL THROTTLE do a climb out and it should MAINTAIN the rpm if not and it bogs lower the top end pitch if it overspeeds add top end pitch, then make the curve LINEAR or EQUAL.

To make it short and sweet MARRY the pitch to all the throttle points on your radio to give you the headspeed you want do not change the throttle atv's or curves that's doing it backwards I was told long ago when I started. Always maintain the full throttle range to use the full potential of the motor and make tuning it setup simple!! KISS!!!!

Tom

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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11-27-2006 01:39 AM  11 years agoPost 3
McGyver59

rrNovice

Mo. USA

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I have enough power at 50% carb opening (3/4 stick hover) I would have to set the pitch at 9 or 10 degrees to get the head down to 1600/1700 RPMs at hover. I only have the capability for 11 degrees up and 11 down then I would over speed on the top end because I can only get 11 degrees. If I could add even more pitch than the 11, blade stall can become a problem. Just adding pitch cant be right.

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11-27-2006 05:05 AM  11 years agoPost 4
gftazz

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upstate N.Y. in the Adirondacks

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Ok your hovering at 3/4 and 50% you think.

Not trying to be a pain in the butt but are you sure your throttle is at exactly 50%? I'm not talking about the radio settings but the actual carb. opening? See on the 50 Hyper there is 3 little marks on the carb body and when you turn the carb arm there is a single mark that lines up with the middle mark of the 3 marks on the carb. body and that is exactly 50% throttle.

If all you have is 11-11 for a pitch range you can either do a couple of things here. Change the pitch range to -10 to plus 12 so the pitch is scewed slightly to the positive side of the range. Not very often do you need more pitch than -10 on the lowend. Also if you want to you can slightly richen the main needle some and maybe go to 40-45 % opening at half throttle to lower headspeed or a combination of all 3.

I have never set more than maybe -10 1/2 degrees on the low end and set 50% throttle carb actual opening at hover and whatever pitch it will take to get it to come off the ground and start to hover at that point. If you want something different than you may have to lower throttle 5-10% and raise pitch 1-2 turns or 5% or so. Remember to keep the throttle curve linear though in other words make the % points equally spaced apart ie. 0 20 40 70 100 or 0 25 50 75 100 etc. You don't necessarily have to hover at exactly 3/4 stick it can be off a little bit to get things right the way you want them to be.

Tom

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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11-28-2006 01:38 AM  11 years agoPost 5
WINDBUSTER 2

rrNovice

BAY STATE,MA.USA

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McGyver59... carb setting...

I find it hard, to find the right throttle setting, till i read the set up
on http://www.raptortechnique.com/ there may be some helpful hints
that can help you set up the radio.

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HelicopterBeginners Corner › Throttle setting
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