Basic setup, which do you do?
 

There seems to be 2 schools of thought out there that I have seen.

1. Set max throttle curve to 100% and set the pitch to what ever the engine will pull. Example 11 or 12 degrees.

2. Set the pitch to like 9 degrees and then set the max on the throttle curve so the headspeed remains constant. Maybe will be 85% max on the throttle curve.


I use the second method as it leaves a little extra throttle left to be mixed in with the cyclics.

Max Throttle
 

I set the throttle to maximum then adjust the pitch to match. With a Futaba radio, you wont overdrive the throttle with mixes. :D

Basic setup, which do you do?
 

I never ever limit the throttle!

The way I setup any machine, is to fine center on every moving part, all the way up to the swashplate...Then, on the head, I zero the blades, with all mixers level...I check my work by noticing that i have the same pitch , and atv settings lock to lock...
Then I go to the pitch curve to set up what I need while still keeping the curve as linear as possible...

I use a Futaba 9Z, so limit on the throttle is not an issue..I set the throttle linkage by making sure the radio is in default settings with low trim...
I measure the lenght of the ball on the throttle barrel...I use this same distance on the servo arm...I go out one hole for aerobatics, and go in one hole for scale flying on the servo arm...if the engine has no power, I maygo out futher on the arm..
I use a straight wire to center over both axis..With the stick at 50% I use this line to make both arms 90degs ..I check my work by making sure the atv's are the same...
If you have a older JR that has that throttle limit problem..Then after you do all this with the throttle, go to high throttle, take the arm off of the servo...Next go the subtrim, and move it to high side 5 % above what your throttle atv is...You may have to make small adjustments with it, to keep your high throttle setting..So long as you stay 1% above the throttle atv value, it will not overdrive on the swashplate to throtlle mix...
After breaking the engine in, I then deside on the blade:)
Regards,
Bill Meador,
Team Vario

Basic setup, which do you do?
 

Great post Bill, very informative.

Thanks.

I use a 10X so I don't have servo overdrive problems either. I do all the basics like you point out. Everything centered and atv's even then set pitch curve from there.

I guess what I'm trying to say is that if you match the pitch to what full throttle will pull what happens when you throw cyclic in at the same time?

My 30 machines for instance. I set them at 9 deg pitch and can climb without a change in head speed at 85% throttle. I also use cyclic to throttle mixing and have some reserve power even at full collective.

Just the way I do it and seems to be working good for me.

Basic setup, which do you do?
 

Hivoltage,
the Futaba 9Z is the only Futaba radio that will Not overdrive the throttle with cyclic to throttle mixes. It has a dedicated program to do the cyclic to throttle and not overdrive the servo. The rest of the Futaba computer radios will overdrive the servo unless the ATV's are maxed on throttle and then the throttle linkage set up so it won't happen.If using a cyclic to throttle set up in the Program mixes.
David

Sorry
 

Thats what I meant to say....the 9Z radio. :)

For some reason, I sure have a hard time setting my throttle ATV's and getting them close to 100 and the same on both ends. I wish somebody could enlighten us all on the proper, easy, way of going about this. I manage, but it takes me forever. There must be a system. Where to start on servo and carb arm lengths for one.

I know...I am probably the only one here that has this problem. :D

Basic setup, which do you do?
 

Hivoltage,
Here is how I set up the throttle servo and throttle arm.
OK first you want to measure from the hole on the throttle arm to the center of the pivot point for the arm on the throttle barrel. Lets say it was 15 mm for an example. Then you want to put the ball on the servo wheel or arm 15 mm out from center of the wheel or arm. Now you want to measure from the center of the pivot point on the throttle barrel arm to the center of the servo wheel or arm. For example lets say this distance is 100mm. Now you want to make your throttle pushrod 100 mm center to center of the ball links. Now with the throttle curve defaulted 0, 25, 50, 75, 100 if your using a 5 point curve. Put the throttle stick exactly in the mid stick position. Now try to find the exact center of the throttle barrel travel range by cycling the arm fully open to close several times. Then place the arm in the middle of its range best you can. Now put the servo arm or wheel on the servo so that the pushrod will be as close to 90 degrees when connecting towards the carb arm. You also want to place the carb arm so that it will be 90 degrees to the pushrod when it is in the midpoint of its travel range. Now you should have the carb arm at the 50% point of its travel range and the servo arm should be in the midpoint of its travel range. You should have a parrelleogram formed with the servo arm and the throttle arm. Now if all this is correct you should be able to cycle the throttle stick open to close and the throttle arm should fully open to fully close with the ATV's at 100%. IF not it may take just one of two turns of the ball links either direction to bring it within reason.
Don't know if this helps or you can understand it, hard for me to explain thru a forum.

David

Nice
 

Thanks David n Billme.
Nice very good info.

Yeah...Thanks
 

Thats a good explanation David. I am going to print this out and give it a try. Thanks for taking the time to write that all out. :cool:

Basic setup, which do you do?
 

Scott said:
I guess what I'm trying to say is that if you match the pitch to what full throttle will pull what happens when you throw cyclic in at the same time?



You load the engine a little....:) I like to here the engine working It tells me I need to back off...If its to bad, then I adjust the atv's on the roll to minimize it....Besides, if you start a roll at full throttle, when you back off on the collective, the swashplate to throttle mix should be helping by then, if you have it set right...

I look at it like this, get what you can, when you can from the engine to the blades. Whatever you do, if it works, then let her rip tatorchip Scott, hehee

BTW, as always David, good job

Regards,
Bill

Basic setup, which do you do?
 

throttle 100%, adjust pitch for max load and then i turn on my governor :)