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HomeAircraftHelicopterGasser Model RC HelicoptersOther › RC Kill Switches
04-20-2011 02:52 PM  7 years agoPost 21
klamp

rrNovice

Boston

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A kill switch kills the engine at the spark plug rather than the fuel supply.

Kill switch is used in case the throttle servo is stuck or linkage pops off. In those instances, radio inputs are moot. You can trim all you want, but if there's no physical connection to the carb nothing's going to change, in which case you simply have to wait for the fuel to run out.

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04-20-2011 02:55 PM  7 years agoPost 22
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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The carb I use has a spring on it that closes it, what's on yours?

Why would your throttle servo be stuck? Do you have the same problem with cyclic servos? Do they get stuck?

I suppose if you're using cheap servos, then spending more money on a kill switch, my suggestion would be to spend more money on the servo!!

Chris D. Bergen

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04-20-2011 03:55 PM  7 years agoPost 23
rbort

rrProfessor

Franklin, MA - USA

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Funny!
Quote:
Originally Posted by cpierre82
I have been flying my 600 gasser for about two weeks now. I have been reading everything on here. I just added a GV1. Everything was working fine until my throttle servo went dead on me about 4 feet off the ground. The heli is fine, I had a hard time trying to get the motor to stop running. What throttle servo do you recommend? In the mornings its about 55 degrees here in NC, why does it take the motor so long to warm up? It takes about 10min before the motor will run right.

charles

What servo were you running? I had a DS610 fail on me after about 12 flights. After that I just buck up and spend the money on quality servos rather than repairs due to crappy servos.
Does this sound familiar?

-=>Raja.

P.S. Okay okay yes a kill switch will be useful if your throttle servo failed, but generally that should be rare and if it did its not the end of the world you can fly it until the gas runs out but most likely it will work again in a few minutes and throttle back down.

Also like Chris says, if the link popped off the carb will close automatically with the spring. I never had one pop off on me but many many years ago the pushrod from the servo to the carb snapped right in half on my 1005 and the motor died. I was far out and was able to barely float it all the way back to the runway over the tall grass and brush. She just plopped in like 3 feet past the mowed edge for a good save

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3292 flts
Whiplash V1-2 Hanson 300, 1575 flts
Whiplash V2 Hanson 300, 414 flts

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04-20-2011 04:03 PM  7 years agoPost 24
turboomni

rrProfessor

East of the Equator

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Kill switch is used in case the throttle servo is stuck or linkage pops off. In those instances, radio inputs are moot.
If the linkage pops off then the spring on the carb will close it.
So the only thing I see a Kill Switch able to do is in the case of a throttle servo that goes completely dead all of a sudden. I guess if that happened to me before and was a nightmare then I guess I would consider getting a kill switch for the motor. Has this scenario happened to you guys before and then you got a kill switch?

Setup is everything, All my heli's can fly far better than I can pilot them

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04-20-2011 04:13 PM  7 years agoPost 25
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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To add, I use a Futaba 9254 servo on my throttle...If it goes dead, the carb spring CAN overpower it and close.

Its an old tail servo, seemed to be weak on the tail, put it on throttle, been there for over 3 years...

Chris D. Bergen

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04-20-2011 04:38 PM  7 years agoPost 26
pgkevet

rrKey Veteran

Wales

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Has this scenario happened to you guys before and then you got a kill switch?
I've had a ds620 jam on a nitro throttle and had to fly the tank out.
But preddie once tried to go walkabout despite failsafe.... but then that had to be a power glitch 'cos killswitch didn't work either

As stated before I use the killswitch to shut off on landing, too... quick and convenient and gets me close quicker to read the thermocouple.

Each to his own. I like mine.

pgk

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04-20-2011 05:13 PM  7 years agoPost 27
turboomni

rrProfessor

East of the Equator

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Definitely nothing wrong with having one,,I was just curious on the specifics on why you guys like them.

Chris Futaba 9254,,is that the servo that comes with a 401? I guess it's not a no no to use a digi on the throttle.
I didnt know that and the fact the spring can overpower it when dead is a +. I may use an old one when the present one poops out.

Setup is everything, All my heli's can fly far better than I can pilot them

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04-20-2011 07:56 PM  7 years agoPost 28
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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It certainly can't hurt to have one, except maybe in the case of one of my customers called Monday wanting to replace his engine because it cut out in flight on him.

The previous owner installed a simple kill switch on the frames..Care to guess why the engine was quitting in flight?

The Killerrc does seem to be the best of the breed, but if you follow a few simple rules, a kill switch is NOT a mandatory thing.

1, setup failsafe in the radio to kill the engine. This INCLUDES 2.4ghz systems

2, use a good quality servo

3, retain the spring on the carb. Some manufacturer's previous instructions had you remove the spring...

4, setup the throttle linkage so that stick and trim all the way down kills the engine.

5, if a hot start or runaway DOES occur and you have a hold of the heli rotorhead, DON'T let go!! Operate the choke or place your hand over the venturi. If you have an airfilter W/O a choke, pull the spark plug cap (if accessible).

6, If you like to do blinding speed piro's, make SURE your battery is secure! (or use a Jewel... )

Chris D. Bergen

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04-20-2011 08:19 PM  7 years agoPost 29
rbort

rrProfessor

Franklin, MA - USA

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All excellent points by Chris
I honestly had that killerrc unit (still have it in my drawer in the shop) and it was flaky on me where it would kill the motor in flight by itself or just hickup the motor when vibrations seemed to affect the relay switch in it. It was cool while installed and in there, but I didn't get the best reliability feeling of it and maybe it was just me or my unit was flaky, I'm not saying they are all like that but reminded me of my issues when Chris mentioned his customer.

The only point I would like to add to all the good stuff that Chris said, is that if you do have a runaway hot start and you have a filter with no choke, you can plug the exhaust with your finger and that will kill the motor faster than anything else like pull the fuel like or pull the spark plug wire which is hard for me to get off quick with the A-frame ladder in the way around it.

In most cases the muffler will be cold and not burn your finger, unless you just landed and generally if you had time to refuel then the muffler is not hot enough to do serious damage to your finger while you plug it. Certainly an excellent 'kill switch' choice when #1 there is no choke and #2 the engine is cold and you get a hot start.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3292 flts
Whiplash V1-2 Hanson 300, 1575 flts
Whiplash V2 Hanson 300, 414 flts

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04-21-2011 04:34 AM  7 years agoPost 30
turboomni

rrProfessor

East of the Equator

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The only point I would like to add to all the good stuff that Chris said, is that if you do have a runaway hot start and you have a filter with no choke, you can plug the exhaust with your finger and that will kill the motor faster than anything else
So if you have a Hot Start just do a Colonoscopy on your gasser!

Setup is everything, All my heli's can fly far better than I can pilot them

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04-21-2011 04:42 AM  7 years agoPost 31
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Or flip the choke closed (if you have one).

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04-21-2011 04:46 AM  7 years agoPost 32
turboomnirrProfessor - East of the Equator - My Posts: All  Forum  Topic

Or flip the choke closed (if you have one).
read the post,,,,,,,,,,,

Setup is everything, All my heli's can fly far better than I can pilot them

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04-21-2011 12:24 PM  7 years agoPost 33
klamp

rrNovice

Boston

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Why would your throttle servo be stuck? Do you have the same problem with cyclic servos? Do they get stuck?

I suppose if you're using cheap servos, then spending more money on a kill switch, my suggestion would be to spend more money on the servo!!
I actually did have a DS610 jam on my aileron. And now I do spend the money on servos. .

I personally don't run a kill switch in my helis, but I do on my baja. OP asked for a recommendation for a kill switch. The Killer Bee has worked flawlessly on my car. To each their own.

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04-21-2011 02:55 PM  7 years agoPost 34
Rototerrier

rrVeteran

Fayetteville, GA - USA

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There are 4 other critical servos in my helis, that when failed, will result in a nasty crash...the throttle is the last servo I tend to put a lot of thought and worry into.

So far, knock on wood, I have only had 2 servos go out on me and they were both throttle servos. Throttle servo failurds aren't that bad in the grand scheme of things.

1 on a nitro and the other on one of my gassers. The nitro had to run till the fuel was all gone and auto. The gasser was caught before it totally went out.

Both servos were used. I have since changed over to running nicer and newer servos on my throttles.

Gassers Rule, Nitros Drool, Electrics...uhhh...Joule?

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04-21-2011 03:05 PM  7 years agoPost 35
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I had gasser vibration cause a throttle servo to not only have the gears wear and stick in place, but also have the pin inside the servo holding the intermediate gears break. In addition, two of the plastic mounting tabs on the outside of the servo snapped off. This was a $60 JR servo and there was a total of maybe 3 hours on the airframe using 3 different engines.

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04-21-2011 03:42 PM  7 years agoPost 36
turboomni

rrProfessor

East of the Equator

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That is massive vibration Justin. Was the heli a blur in the sky?
When I bought my 1005 used as a precaution I sent the servos that came with the heli to JR for service even though on the bench and a few flights worked fine. They came back with a clean bill of health. On the First flight the aileron servo gears stripped and she went in just after takeoff at about 3 feet altitude. I then got all new servo's 8311 JR's I think and it's been fine for years now. Poop Happens!!

Setup is everything, All my heli's can fly far better than I can pilot them

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04-21-2011 04:27 PM  7 years agoPost 37
rtdillon

rrApprentice

Huntsville, AL

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KillerRC
If the killer Bee loses power, loses its input signal (Lockout or loss of TX) or is commanded to do so, the relay relaxes and kills the motor.

You cannot design a system for every conceivable problem but something like this for an engine kill feels right to me. I a looking around for an electronic relay to aleviate the vibration problem Rbort related. Those little mechanical relays are not designed for high vibration environments.

There are also concerns about introducing electrical noise into the system with an electronic relay so who knows, it is a exercise in research for me right now.

No,No..The other left!

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04-22-2011 05:08 PM  7 years agoPost 38
rbort

rrProfessor

Franklin, MA - USA

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That's what I'm talking about
I a looking around for an electronic relay to aleviate the vibration problem Rbort related. Those little mechanical relays are not designed for high vibration environments.
My remote kill switch had this exact problem hence why I stopped using it. We need an electronic relay switch as the mechanical one was being vibrated on and off not all the time but at random times during a flight.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3292 flts
Whiplash V1-2 Hanson 300, 1575 flts
Whiplash V2 Hanson 300, 414 flts

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04-22-2011 06:20 PM  7 years agoPost 39
Yeager

rrApprentice

Lisbon, Portugal

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I've installed the PowerBox SparkSwitch (link below!), but only recently. So fare it's worked fine.
If the Rx pack or ignition pack dies, the sparkswitch cuts of the ignition. Also you can program the failsafe on you Tx in a way that the ignition will die if signal is lost.
Just as an alternative to the other recommendations.

http://www.powerbox-systems.com/e/p...witch/start.php

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04-22-2011 06:23 PM  7 years agoPost 40
Justin Stuart (RIP)

rrMaster

Plano, Texas

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^^^^ This is for an EI motor, and will not work with a magneto motor.

The OP has a magneto motor.

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