Throttle X9303

[ZAC ATTACK]

Setting up the THR in the X9303,theres a quaeter stick at the bottom of the THR channel.I really dont understand on how to set my endpoints?If I go all the way to the bottom of this THR channel,my endpoints will be %75-%125 beacause of the quarter stick Excess on the bottom of the THR channel. Q:How do set my endpoints to achieve %100-%100? Do I ingnore the Quarter trim excess? Lew:oops:

[N11634]

Set up your throttle end points with the throttle trim all the way down and ideally you want the throttle end points less than 100% so that it will lead your collective. There's a hundred different schools of thought on this, but mine is that you want the end points on the throttle at around 70% each way. Adjust your linkage ball positions until you achieve this....usually all the way out on a standard servo horn and the closest hole in on the Hyper will get you in the ballpark. That way your idle will be around 1/4 to 1/2 trim on the heli.

[DavidH]

Ideally you want the ATV's on the throttle 100% each direction. You do not use the throttle ATV( Endpoints) to set up a throttle curve. If you want to lead the collective with the throttle, you go into the throttle curve and make that adjustment.
But using the ATV's or endpoints it shifts the neutral of the servo.
For example if you have 70% ATV at one end and 100% at the other end. It screws up trying to set up a throttle curve.

Set the ATV on the throttle channel 100% both directions. You want the ball on the carb arm to be the same distance from center of rotation as the ball on the servo arm.

Here is how to set up the throttle on a nitro heli.
http://www.ronlund.com/throttle.htm

David

[ZAC ATTACK]

Im sorry for misleading,I know how to set-up the THR. My Throttle is perfect,but its the extra quarter trim on yhe bottom thats throwing the endpoints off! It closes&opens perfectly at the carbs open/close marks at %100 endpoints! Its the extra quarter trim on the bottom thats messing me up,with the 9CHPS you would use this extra trim on the bottom for the TRHR-CUT feature,this TX doesnt have that,do you understand my problem? ATV should be %100 definetly!\! Lew

[N11634]

There's a hundred different schools of thought on this, but mine is.....
Like I said, there are different opinions on this.

How do yo make the adjustment to lead your pitch in the throttle curve? There's an adjustment that makes the throttle move before the collective?
What I mean is so that if the throttle and the pitch are both at 100% on the curve, when you push the throttle up quickly, the throttle will get there first because in reality, it's only got 70% of the way to travel.
I mentioned nothing about the throttle curve itself in the original post.
using the ATV's or endpoints it shifts the neutral of the servo
I haven't heard of shifing the neutral on a throttle servo, please elaborate.
If you mean center of the servo, that's why you get it at 70% both directions, not 70 one way and 100 the other.

[ZAC ATTACK]

Im not talking about curves nor throttle before collective!I run a 9254 servo on my throttle,the collective is a 9252,collective being under load and my endpoints on the throttle & collective set at %100,my throttle always gets to position first! You have to move the stick a quarter of the way up and your throttle trim half way for your heli to idle,now the only way I see on how to end up with your endpoints at %100 is at quarter throttle,if i try to compensate for the quarter trim,im screwing up my endpoints! Am I missing something? Im using the bottom Quarter of stick as my THR-CUT ! Am I correct in doing this??? Thanx! Lew

[DavidH]

With the trim all the way down and the throttle stick at its lowest position and throttle curve at 0% on the first point. You want the low ATV to be 100% and the high to be 100%.
The throttle barrel would be fully closed at low stick and the barrel fully opened at high stick.

The 9C had digital trim on the throttle and a throttle cut switch you could use to kill the engine.So you did not have to move the trim on the 9C once the idle was adjusted correctly. When you was ready to stop the engine, you just pulled the throttle cut switch. The 9303 uses an analog trim on the throttle. So that is how you set the idle and when you get ready to kill the engine you pull the trim all the way down.
I would not use the throttle stick to kill the engine. I would use the throttle trim by moving it up and down. That is they way it was designed to be used.


Maybe the above is what your asking.

haven't heard of shifing the neutral on a throttle servo, please elaborate.
If you mean center of the servo, that's why you get it at 70% both directions, not 70 one way and 100 the other.


Yes all servos have a neutral( center) position. It is determine by the pulse from the transmitter. Moving that neutral postion will screw up a throttle or pitch curve.
As for using 70% ATV in both directions, you not using the full resolution of the servo.
If you set the throttle up with 100% ATV both directions. And you have 100% at the top of the throttle curve. You push the stick all the way up and the throttle barrel opens 100%. Now you change the ATV's to 70% and push the stick all the way up, the throttle barrel is not going to open 100%, it will most likely be about 3/4 open.

This link is how the vast majority of pilots I have been around set up there throttle linkage
http://www.ronlund.com/throttle.htm
David

[ZAC ATTACK]

David, At a quater trim ,thats where the carb reaches its closed position, you cannot go beyond that!Everything from quarter stick down Dave,its binding.This is an R50.

[DavidH]

Need to move the ball inward on the servo wheel/horn. Or move the ball outward on the arm on the throttle barrel. The geometry is off. At 100% ATV both directions and the trim all the way down. You want the throttle barrel to fully open at full high stick without binding. Then at full low stick you want it to full close without binding. Moving the balls on the servo end and the throttle end and this can be accomphlished.
Just like here
http://www.ronlund.com/throttle.htm

David

[ZAC ATTACK]

Dave thanx, your info is appreciated,your trying to help! I just noticed the throttle was not closing fully! Upon further investigation,there was debrise in the god-dam carb.It wasnsnt closing fully Dave! I feel like a real JERK ! Endpoints line up perfect now ,%100L-%100H at fully open/closed positions! :oops: Sorry!!

[DavidH]

Dave thanx, your info is appreciated,your trying to help! I just noticed the throttle was not closing fully! Upon further investigation,there was debrise in the god-dam carb.It wasnsnt closing fully Dave! I feel like a real JERK ! Endpoints line up perfect now ,%100L-%100H at fully open/closed positions! :oops: Sorry!!

Zac,
Glad it is working like it should. Sometimes in this hobby it just takes stepping back and looking at the situation again. No need to feel like a Jerk. I know fully well how some of the problems can be frustrating in this hobby.

David