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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › throttle return spring?
11-15-2011 09:16 AM  6 years agoPost 1
low.level.3d

rrApprentice

Switzerland

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Hi,

I was wondering why our nitro engies dont have a spring, that would return the throttle to a completely closed position in the event the throttle linkage brakes/pops of.(e.g. when crashing)

this would prevent an unwanted chickendance.

i remember earlier times, when i used to fly nitro powered planks. they usually had this kind of spring.

any idea?

cheers,

cyril

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11-15-2011 11:36 AM  6 years agoPost 2
Heli 770

rrProfessor

USA.

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11-15-2011 07:31 PM  6 years agoPost 3
honda411

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Surprise, AZ USA

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+1

I always use one on my heli. and radio fail safe options as well.

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11-15-2011 08:17 PM  6 years agoPost 4
low.level.3d

rrApprentice

Switzerland

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hi,

thanks for the answers. I think I will install one as well.

may I ask you where you buy yours?

thanks,

cyril

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11-15-2011 08:35 PM  6 years agoPost 5
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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I fly at 100% throttle so spring not needed Ok on a serious note I've never had a throttle linkage come off or did the chicken dance . If battery come disconnected spring might help but added stress to throttle servo doesent outway the chances of a failure for me

I stole it ,flew it and gave it back ;)

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11-15-2011 09:42 PM  6 years agoPost 6
low.level.3d

rrApprentice

Switzerland

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ok.

if the heli crashes, chances are, that the linkage somehow goes off. (it could brake or pop off)

In that case a spring will help - no doupt. (spring would have to be connected btwn frame and throttle arm on the engine, not on the servo arm)
in such case, the spring doesnt have to be that strong, so the servo wouldnt be stressed too much. (compared to the other servos on a heli this is nothing, IMHO....)

if the battery goes off, and the linkage stays on, the spring would have to be quite strong in order to move the throttle arm of the engine, because the servo is still connected. I agree, that such a spring would stress the servo unnecessarily. (think we cannot cover such a failure)
I am not looking to cover a battery failure. but a linkgae failure.

100% fail safe is not possible!

just my 2 cents...

cyril

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11-15-2011 09:46 PM  6 years agoPost 7
Jeff polisena

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westpalmbeachflorida usa

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^ 2cents well spent

I want to do a test , make link pop off in flight and see what happens ,I'm thinking throttle will close but I will see

I stole it ,flew it and gave it back ;)

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11-15-2011 10:32 PM  6 years agoPost 8
low.level.3d

rrApprentice

Switzerland

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how do you want to make your link pop off in flight?

cyril

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11-15-2011 11:09 PM  6 years agoPost 9
Jeff polisena

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westpalmbeachflorida usa

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I'll cut link end and over travel servo with atvs. I will leave small amount of fuel so I can fly out hard 3d if it goes 100%

I stole it ,flew it and gave it back ;)

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11-15-2011 11:35 PM  6 years agoPost 10
Heli 770

rrProfessor

USA.

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Jeff
Since your going to do this to prove a point, Good Luck!!!

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11-16-2011 12:28 AM  6 years agoPost 11
Jeff polisena

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westpalmbeachflorida usa

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I say I won't have anything to worry about because if motor dies I can auto it it goes 100% as long as I keep load on head motor will be fine and I've ran out of fuel a few times so no surprises there.
My point is to find out if carb will close or open , if it closes then no need for spring .

I will do a video but don't laugh

I stole it ,flew it and gave it back ;)

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11-16-2011 12:58 AM  6 years agoPost 12
Heli 770

rrProfessor

USA.

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Great, about the video! And I promise you won't see me laughing.

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11-16-2011 01:21 AM  6 years agoPost 13
honda411

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Surprise, AZ USA

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Remember if you put a spring on the throttle arm, the arm doesnt over rotate, meaning the spring actually holds it open. I think that makes sense. I always run like an align 620 servo so a spring is fine. But usually the spring will pull it to zero throttle when i move the servo arm by hand and let go.

Where to buy: you can buy them at like amainhobbies.com, or wherever the nitro rc cars are. they should them. And they are cheap. And if they are too stiff, just stretch them a bit, or too loose, cut the spring shorter.

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11-16-2011 04:12 AM  6 years agoPost 14
Evan03

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Idaho

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Doesn't the 620 have less tourge then a 610 but is faster. Wouldn't that mean a 610 would be better with a spring on it.

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11-16-2011 04:42 AM  6 years agoPost 15
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I believe it is officially called an "anti-chicken dance spring".

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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11-16-2011 05:06 AM  6 years agoPost 16
Evan03

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Idaho

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lol

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11-16-2011 05:54 AM  6 years agoPost 17
honda411

rrKey Veteran

Surprise, AZ USA

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Evan: both will be perfectly fine. User choice between the two. I even have a spring on my trex 700n with a JR 3400G mini servo. Works flawlessly.

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12-07-2011 07:58 PM  6 years agoPost 18
Heli 770

rrProfessor

USA.

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Jeff
Have you done a video yet or even had the time to try it?

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › throttle return spring?
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