42 replies to this topic

[dazj10]

hi all , this may seem a stupid question , but is it possible to fit a kill switch to a nitro engine

cheers
daz

[The Trooper]

Nope, the way a petrol kill switch works is to short the spark plug, something nitros dont have, the glow plug is constantly glowing as opposed to the spark plug that sparks when the piston is at the top of the cyclinder

[dazj10]

right ok , thanks

[louder]

You maybe could set up a valve in the fuel line....make it servo controlled. On another channel. I would mean priming the engine each time but I dont see why it wouldn't work.
I have been thinking about doing this for a while with my third channel. Its just finding a place to mount it. I am also unsure as to the implications of doing this to your engine long term. I currently squeeze the fuel line but it doesn't complete get cut it just starves the engine and causes it to stall and cut out.

Just something to think about. I have been for a while now....but then I always think for all that effort why do I want a cut off switch. Its not like im gonna turn it off 500m away from me. It would be pointless, but it still want to do it just because.

[badger906]

or just stick your foot on the fly wheel.. or finger if you dont have girly hands

Edited by badger906, 17 August 2010 - 09:07 AM.

[Smoothybb]

badger906, on 17 August 2010 - 09:07 AM, said:

or just stick your foot on the fly wheel.. or finger if you dont have girly hands

So how do you wire that up to the third channel?

[jon450]

Smoothybb, on 17 August 2010 - 09:57 AM, said:

So how do you wire that up to the third channel?

LMAO

Edited by jon450, 17 August 2010 - 06:01 PM.

[dazj10]

badger906, on 17 August 2010 - 09:07 AM, said:

or just stick your foot on the fly wheel.. or finger if you dont have girly hands

its abit hard to stop the flywheel when ya car is goin full pelt across a field mate LOL

[Bazzokajoe]

nitros stall anyway pretty sure the savage had a quick stop thing that wedged the flywheel?

correct me if i'm wrong...

[adolf hamster]

the only reasons a petrol has a remote killswitch is because they can. and the americans saw a way they could make money out of playing on peoples fears. a nitro doesnt need a killswitch, in fact. if you take care enough you could wing it without a failsafe. but i wouldnt advise that. what i will say. is a decent radio setup with a reliable failsafe and well setup wiring and maybe a throttle return spring for the most cautious will cover you for pretty much all the eventualities.

[HATZY]

adolf hamster, on 17 August 2010 - 06:14 PM, said:

the only reasons a petrol has a remote killswitch is because they can. and the americans saw a way they could make money out of playing on peoples fears. a nitro doesnt need a killswitch, in fact. if you take care enough you could wing it without a failsafe. but i wouldnt advise that. what i will say. is a decent radio setup with a reliable failsafe and well setup wiring and maybe a throttle return spring for the most cautious will cover you for pretty much all the eventualities.

never thaught of a return spring *slaps head*

[dazj10]

adolf hamster, on 17 August 2010 - 06:14 PM, said:

the only reasons a petrol has a remote killswitch is because they can. and the americans saw a way they could make money out of playing on peoples fears. a nitro doesnt need a killswitch, in fact. if you take care enough you could wing it without a failsafe. but i wouldnt advise that. what i will say. is a decent radio setup with a reliable failsafe and well setup wiring and maybe a throttle return spring for the most cautious will cover you for pretty much all the eventualities.

i,ve got 2.4 set up with built in f/s and a seperate f/s so the only way is like you say. throttle return, spring but wouldnt this lessen the battery time and servo lifespan, has the servo has to pull against the spring , causing strain on the gears and the servo needing more force to pull the throttle would take more battery, i might be wrong but it seems logical to me

[HATZY]

dazj10, on 17 August 2010 - 06:34 PM, said:

i,ve got 2.4 set up with built in f/s and a seperate f/s so the only way is like you say. throttle return, spring but wouldnt this lessen the battery time and servo lifespan, has the servo has to pull against the spring , causing strain on the gears and the servo needing more force to pull the throttle would take more battery, i might be wrong but it seems logical to me

makes sense since you would need a strong spring to be able to pull the servo too

[adolf hamster]

dazj10, on 17 August 2010 - 06:34 PM, said:

i,ve got 2.4 set up with built in f/s and a seperate f/s so the only way is like you say. throttle return, spring but wouldnt this lessen the battery time and servo lifespan, has the servo has to pull against the spring , causing strain on the gears and the servo needing more force to pull the throttle would take more battery, i might be wrong but it seems logical to me

this is true. however remember that a slight maladjustment in the linkage can do just as much in terms of extra load to the servo. personally i like the idea. but the only thing it protects against is total battery failure [that a failsafe wont do] and that is both rare and can be prevented by the cunning use of cable ties, regular charging and maintenence of the electronics.

HATZY, on 17 August 2010 - 06:58 PM, said:

makes sense since you would need a strong spring to be able to pull the servo too

not really. depends on the servo. your right though some do take a lot to move back to position. but others [especially higher end servo's ive noticed] are easier to pull back to position so wont need as strong a spring

[domcharlton]

My Savage Is fairly bulletproof to this the 2.4ghz has a built in failsafe and there is a spring anyway! Hpi tend to think of everything IMO.