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Old 06-19-2007, 08:04 AM   #1
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Default what'll happen if...

hi all experts here,
me new in nitro cars so pardon me asking:

let's say we're racing our cars on track, what'll happen if...

1. the receiver battery went dead?
2. the transmitter battery went dead?

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Old 06-19-2007, 08:09 AM   #2
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Most likely you will have what we call a "RUNAWAY" No signal to/or from the car will result in loss of control!
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Old 06-19-2007, 10:24 AM   #3
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Normally when the receiver battery goes dead, it doesn't just die like it is unplugged. The response of the servos slows to almost a stop. Usually the steering servo becomes very slow and won't work when you are using the throttle. The voltage just isn't there to work both servos at the same time.

I have never had a transmitter battery go dead, but I would guess you would have a runaway at that point. If you are using the spektrum system, the car would just go to whatever failsafe setting was programmed.
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Old 06-19-2007, 10:32 AM   #4
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The simple thing you can do is use a throttle return spring. Once your reciever is dead, the spring should have enough tension to close the throttle on the carb. This shuts off the engine at the moment of a power failure. Just put a spring on your carb (where the throttle linkage connects to it) and mount it down on another part of the chassis. Do not make it too tight, just enough to close the throttle after power goes out.

I could be wrong ,but I think ROAR rules require a throttle return spring for nitro racing.
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Old 06-19-2007, 11:42 AM   #5
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Well what most people are doing now is putting a rubber band on their carb to close it instead of a spring...
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Old 06-19-2007, 01:33 PM   #6
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Originally Posted by Luke W View Post
Well what most people are doing now is putting a rubber band on their carb to close it instead of a spring...

Kyosho has instructions on how to do this:
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Old 06-20-2007, 03:51 AM   #7
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thanks guys for yr responses...

in order to pull-back the throttle, i found that the 'rubber band' tension must be quite tight...

'forcing' the throttle return; will it damage the servos?

btw, if transmitter dead, same symtoms as receiver dead? same remedy?

p.s. my frt wheels will turn to the right when i switched on the receiver, but it'll return to straight after i switched on the transmitter, any concern here?
it's ok if i switched on the transmitter 1st then the receiver.
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