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HelicopterEngines Plugs Mufflers Fuel › spring loaded throttle
07-10-2008 04:30 PM  9 years agoPost 1
blt4ice

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Newark, DE

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Anyone ever think about or develop a spring loaded throttle in order to avoid a funky chicken situation?

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar

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07-10-2008 04:33 PM  9 years agoPost 2
GyroFreak

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Orlando Florida​...28N 81W

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It's a very common practice, see my antichicky spring, plus the carb has a built in spring if the linkage pops off.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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07-10-2008 05:25 PM  9 years agoPost 3
nappyroots2182

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Moline, il

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i would put the spring on the carb on itself. most of the time the throttle pushrod will pop off and then the spring wont do any good like in that pic.

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07-10-2008 06:00 PM  9 years agoPost 4
Street Flyer

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Las Vegas, NV, USA

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A guy at my field does this too. It's a good idea, but I would move the spring to the carb instead.

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07-10-2008 07:24 PM  9 years agoPost 5
blt4ice

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Newark, DE

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Ya in my case it would go on the carb arm. But Gyro said he had one on both the servo and carb side.

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar

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07-10-2008 10:58 PM  9 years agoPost 6
GyroFreak

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Orlando Florida​...28N 81W

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Yes blt4ice, on my gasser with a Walbro 643/644 carb It has a very light internal spring which shuts the butterfly valve if the linkage breaks, but I needed just a little more to overcome the off power servo load. My throttle servo is a Futaba 9451 which only takes a very light spring to pull it back to throttle off. For most nitros there probably is no internal spring on the carb, so mount the spring as close to the carb arm as possible. I use a tie wrap at the other end of the spring to adjust the tension to barely overcome the off power throttle servo.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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07-11-2008 09:27 AM  9 years agoPost 7
Droid

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Deep down in the​Southwest- UK

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Anyone ever think about or develop a spring loaded throttle in order to avoid a funky chicken situation??
Yes, most radio manufacturers call it throttle hold.....

Quotes may have been changed for my own amusement

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07-11-2008 01:45 PM  9 years agoPost 8
TankDirt

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Illinois

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Yes, most radio manufacturers call it throttle hold
that made you feel smart?

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07-11-2008 02:08 PM  9 years agoPost 9
BJames111

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San Diego,​California

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Yes, most radio manufacturers call it throttle hold.....
actually many crashes result in the reciever battery being ejected, or somehow unplugged, or the reciever being damaged. I think the spring is a good idea.

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07-11-2008 02:32 PM  9 years agoPost 10
blt4ice

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Newark, DE

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I admire the throttle hold comment, however, I just can't bear to watch over 1,000 dollars of equipment flipping and flapping around on the ground till either the clutch fails, or you have the balls to run up to it, step on it and pinch the line.

Brian
Heli tools used: Torch, Pipe Wrench, 4 ft. crowbar

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07-11-2008 07:53 PM  9 years agoPost 11
Droid

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Deep down in the​Southwest- UK

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What i was implying was that have seen many crashes that could have been far less destructive if the pilot had bothered to flick the "damage limitation switch", wasn't trying to be smart.......

....just trying to educate, throttle hold isn't just for auto practice.

Quotes may have been changed for my own amusement

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07-11-2008 08:30 PM  9 years agoPost 12
dazzaster

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right next door to​hell

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you can hit throttle hold all you want but once the heli hits the ground and the throttle linkage pops off it cant hold the engine at idle.

A.K.A 509

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07-12-2008 11:39 AM  9 years agoPost 13
Droid

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Deep down in the​Southwest- UK

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Forget it, wear your throttle servos out........

Quotes may have been changed for my own amusement

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07-12-2008 03:02 PM  9 years agoPost 14
dazzaster

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right next door to​hell

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if servos can manage the loads that are apllied to them on the cyclics im pretty sure a small spring wont harm a throttle servo.it only has to be strong enough to close the carb should the linkage pops off.

A.K.A 509

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07-12-2008 03:30 PM  9 years agoPost 15
GyroFreak

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Orlando Florida​...28N 81W

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My throttle servo spring has been on for over a year, servo shows no sign of wear. I would muck rather have a slight load on my servo than the dreaded chicken dance and lose everything. Hmmmm, lets see, Do I want a small loaded servo or a dreaded ch-ch-ch-ch-chicken dance that destroys everything ??? It's a no brainer !!!!

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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07-12-2008 03:49 PM  9 years agoPost 16
dazzaster

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right next door to​hell

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of course another trick would be to add a solinoid valve as used on turbines that is defualted to close. you could have it conected to a spare chanel and link it to the throtle cut switch as soon as the battery drops out or you hit the switch the valve closes cutting off your fuel.... but then that probably over enginering the problem.

A.K.A 509

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07-13-2008 02:37 AM  9 years agoPost 17
tchavei

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Portugal

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With our lack of mantainance and luck, the solenoid would probably fail in mid flight...

Thats why turbines are inspected every X hours and many components exchanged in the process.

You can't expect that we do the same on our helis

Anyway... I like the spring idea... where do I get a spring like that from?

Tony


--------------------
"Perfection and patience usually walk side by side..."

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07-13-2008 10:15 AM  9 years agoPost 18
Droid

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Deep down in the​Southwest- UK

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Think of that extra weight Tony!!!!!

Quotes may have been changed for my own amusement

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