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HomeAircraftHelicopterHelicopter Main Discussion › My throttle return spring.
03-09-2012 04:55 AM  6 years agoPost 101
BobOD

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New York- USA

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Ummmm.....won't that burn out your servo.

Don't mind me...I'm just being a jerk...LOL.

Seriously, whatever it takes to make it work....it should be on every heli IMO. Safety is important and this obviously has merit.

Well done.

Team POP Secret

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03-09-2012 05:55 AM  6 years agoPost 102
CX1

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Canada

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sounds like a good idea

Does it cause the servo to drain alot more power?

I'm using a 9257 for a throttle servo would a spring burn it out?

How would you know if there is too much tension at 3/4 - full throttle?

just need to know before I do it to

" Team Protoast "

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03-09-2012 06:02 AM  6 years agoPost 103
Corona007

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Chino,Ca

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Return spring..
I made these and have been using them since 08. They have saved me heli from doing the chicken dance on more than one occasion (3X). Battery popped off and motor going full bore on impact.

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03-09-2012 10:45 AM  6 years agoPost 104
McKrackin

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Lucasville,Ohio

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That's pretty sweet Corona.

CX...The spring won't hurt ANY of the usual servos but some servos are so hard to turn without power that most small springs wouldn't turn them.

I literally never use the word literally right.

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03-09-2012 10:47 AM  6 years agoPost 105
McKrackin

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Lucasville,Ohio

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Again...this WILL NOT HELP in a signal loss situation and may not help in SOME power loss situations.
It will help in some situations and it will NEVER hurt anything.

I literally never use the word literally right.

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03-09-2012 12:57 PM  6 years agoPost 106
GMPheli

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W. Bridgewater, MA USA

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In a signal loss situation, failsafe should kick in. Why might it not work in a power loss? No power to the servo the spring takes over, right? If the servo binds up, I could see it not working.

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03-09-2012 01:07 PM  6 years agoPost 107
Hell-N-Sky

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NYC-->Tenn

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I used springs on my rc cars and trucks and then on my hawk and raven. One thing I made sure to check was what would happen if there was a signal loss. Turned all electronics on then shut off the radio. Each time it would return the servo back to close. Maybe my set up was different but its worth the saved $$ to use them and signal test.
I will say I haven't used the spring on my current set up but am going to throw one on while my heli is down.

No one flies better than me..when I fly alone!

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03-09-2012 01:12 PM  6 years agoPost 108
Nycatt

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New York

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I've used throttle springs when I raced 1/8 onroad and never had any issues, but I also used High Torque servos to pull the brakes from speeds of 60-85mph.




Team Synergy
Rail Blades
MKS Servos
Thunder Power
Vteam

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03-09-2012 01:13 PM  6 years agoPost 109
Pistol Pete

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Seffner, FL

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FWIW...this needs to be said.

Servo torque is measured from 1" from center.

For those interested in a real test approach, do an AMPerage reading with and without spring. No guessing, speculations nor made up numbers.

Digital servos will not offer much resistance unlike analogs when not powered. Thus if using a spring, digital would be the way to go.

~~Enjoying the hobby one flight at a time~~

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03-09-2012 01:16 PM  6 years agoPost 110
MarshallB

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Middle Arkansas

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Again...this WILL NOT HELP in a signal loss situation and may not help in SOME power loss situations.
It will help in some situations and it will NEVER hurt anything.
Yes, It works in a power loss situation and has several times. I've lost servo power a couple of times and the motor gets shutdown. Since I've put these on I've never hurt an engine in the least. They just shutdown. The way this one is designed it has very limited drag on the servo. It has just enough that if you twist the servo with no power, it slowly returns the throttle to the off position. It has much less stress on the servo than a directly opposing spring. The only way this might not work is if the servo locks up. That doesn't happen very often.


CurtisYoungblood.com
Next-D
Spyder Batteries

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03-09-2012 01:26 PM  6 years agoPost 111
DarkSide41

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Sylacauga Alabama USA

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I made these and have been using them since 08. They have saved me heli from doing the chicken dance on more than one occasion (3X). Battery popped off and motor going full bore on impact.
Corona007, that's the neatest and most factory method of all. How about a small description of how you made this and approx. how much force it has ? I guess picking the right servo for throttle is the biggest issue here as we need a servo that the spring is sure to return when loss of power occurs . People please post what servos you have used successfully !

" The biggest threat to our freedom is not from foreign terrorist , but domestic morons"

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03-09-2012 02:15 PM  6 years agoPost 112
Hell-N-Sky

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NYC-->Tenn

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On my cars and my hawk and raven I used low budget hitec analog servos. I think They were 615 on the cars. No metal gear or HD. Losi and Associated sell throttle return springs with mounting plates that have holes in them for the screws.

No one flies better than me..when I fly alone!

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03-13-2012 12:36 AM  6 years agoPost 113
Corona007

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Chino,Ca

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Making the spring...
I fabricated the springs on a coiler, Special machine to fabricate springs. At the time I had access to this machine(s)and knocked out a few dozen (30~40). Most I gave away and sold a few. They worked out so well I have had request for more, But unfortunately I don't have access the the machine anymore.

They were fabricated from .020 music wire heat treated and tempered.
I never took note on what the tension numbers were and just used a digital servo (S9254) for experimenting. Being a tail servo they seem to work the best since they move rather easily. I have also used the S9252.

My very first one with the same config but used .015 music wire but they were too weak, So I bumped it up to .020. Also trying to stay on the minimal torque to move the servo.

Logging more than 300+ flights on the same servo I could confirm it will not ruin your servo.

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06-28-2014 08:40 PM  4 years agoPost 114
Gator1

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Thonotosassa, Fl - Usa

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I know this thread is a little old but wanted to show how easy a fix I did. This is my Trex 700n
This is a $1 dollar spring from Ace Hardware and it is very light and has long ends to bend any way you want. I've heard people say your could burn out the servo, but there is so little preassure applied and even if it does,$70 servo or $600 in repairs which is why I did this fix.
It was the coolest chicken dance anyone ever saw but cost me almost a ton.
If anyone has any questions please don't hesitate to ask.

T.O.R.C.H.S. Orlando Member And T.R.A.C.S. Tampa Member

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06-28-2014 09:02 PM  4 years agoPost 115
Helicrazy4

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West Virginia

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Well worth the money I used it on my nitro Heli .love it!

Following Jesus

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06-29-2014 01:26 PM  4 years agoPost 116
icanfly

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ontario

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I read earlier in this thread that the tail servo exerts a ton of force to move the tail, wrongo, when the tail blades are in pitch the force is little on the servo because the tail gives way to rotate with the pitch. If for only an instant in tail redirection the servo falters I would be wrong. When you have 12kg servos on your heli you essentially can pick up upwards of 30lbs on the servo horn before the servo will stall. Your heli tail don't weigh diddly squat in compare.

You can check the tension on your spring choice with a scale. Get something that weighs more than the spring can pick up and hook one end to it, put it on the scale after it's turned on. Lift on the other end and observe what is subtracted from the initial gross weight, vwalla, there's your spring tension rating, but stretch the spring a little and a lot and the yanking force will increase as it lengthens.

goodonya

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06-29-2014 02:28 PM  4 years agoPost 117
Gator1

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Thonotosassa, Fl - Usa

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Just an FYI. This spring has so little tension I'm not sure how to measure . I have it only on the case of battery failure or crash results in servo loosing all power and staying at full throttle. I not using as a fail safe under power only in the event of loss of power.

T.O.R.C.H.S. Orlando Member And T.R.A.C.S. Tampa Member

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06-29-2014 05:57 PM  4 years agoPost 118
McKrackin

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Lucasville,Ohio

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wrongo

I literally never use the word literally right.

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07-03-2014 12:29 PM  4 years agoPost 119
Gator1

rrApprentice

Thonotosassa, Fl - Usa

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??? Was the wrongo because you don't agree?

T.O.R.C.H.S. Orlando Member And T.R.A.C.S. Tampa Member

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07-03-2014 02:20 PM  4 years agoPost 120
McKrackin

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Lucasville,Ohio

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I was just quoting a post before yours...

I literally never use the word literally right.

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HomeAircraftHelicopterHelicopter Main Discussion › My throttle return spring.
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