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HomeScaleAircraftHelicopterScale Model RC Helicopters › Set up retract gear for Bell 222 with JR X9303 radio
04-28-2013 06:03 PM  5 years agoPost 1
saigon-heli

rrApprentice

Ho Chi Minh

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Hi,

I am trying to set up the retract gear for Bell 222 with JR X9303 radio (9 channel receiver).

I choose Aux 3 channel to control 3 servos by Aux 2 switch (3 position switch), I also use a reversed device to change one servo direction.

When testing, I switch Aux 2 switch by one position, only one servos work but when I switch 2 position at the same time (2 clicks) then all three servo work perfectly. However, the servos travel is ~ 180 degree, which is more than what I need. I go to Travel Adjust to reduce the travel, but it does not work even when I reduce to 10% and when I go to 0% it stops everything, so it either work full range of travel or does not work.

If any one know how to set up to get the right range that I want, please help me.

Thanks in advance,

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04-28-2013 07:17 PM  5 years agoPost 2
rcflyerheli

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Granbury, TX USA

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I am pretty sure that is the nature of a retract servo. You are running a pushrod from the servos to the retracts, right? You just need to get your servo horn/wheel connector in close enough to the center of the servo output shaft to allow for the servo to move it's complete travel.

I made a jig that I mounted the retract unit, and hooked up a dummy pushrod to it. That way I can operate the retract by hand and measure the travel that the pushrod needs to fully activate the up/down of the retract. Once I found the correct travel length, I divided it in half, and that is how far I mounted the output ball from the C/L of the retract servo output arm. It just sounds like your output wheel connection is too far out.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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04-29-2013 01:26 AM  5 years agoPost 3
saigon-heli

rrApprentice

Ho Chi Minh

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rcflyerheli,

Thanks for your instruction. I think, it will work as per your comments.

I still do not understand why there is function on the radio to control the travel but the servos does not respond to the radio command. Does retract servos "by pass" the command like you said "the nature of a retract servo".

Thanks,

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04-29-2013 02:29 AM  5 years agoPost 4
doorman

rrProfessor

Sherwood, Arkansas

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Retract Servo's
"the nature of a retract servo".

That is exactly what is happening to you.. the servo is designed, once it see's power it runs it's full range.. so what rcflyerheli is about your only option... if you can use a channel with just a 2 position switch, like the retract switch would be a better selection and run your gyro through the gyro system in your radio..

Good Luck, Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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04-29-2013 03:34 AM  5 years agoPost 5
rcflyerheli

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Granbury, TX USA

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The reason that there is the travel function on the gear channel is because that channel is used in a lot of cases for tail gyro values, which can be adjusted by setting different endpoints on the gear channel.

In essence the retract servo is like a two position switch. It sees power on its motor that remains constant until it hits the end of its travel. When the switch is moved to the other position, a different set of wipers is powered and it runs to the other end of that wiper until it hits the limit position.

I will be honest, I don't really know how travel adjustment works on other servos, just that it does work.

Good luck, and I hope everything comes together.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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05-02-2013 10:21 AM  5 years agoPost 6
saigon-heli

rrApprentice

Ho Chi Minh

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rcflyerheli & doorman,

Thanks to you. I've done set up with mechanical travel limit, just as you said. It works perfectly. I think the full range travel ~ 180 degree also make retract slow like real one.

Cheers,

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05-03-2013 03:14 AM  5 years agoPost 7
rcflyerheli

rrKey Veteran

Granbury, TX USA

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Glad to hear that you were able to get it set up.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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