Brain Fart Help
 

Hey guys! I got into an argument at the LHS today about a fail safe. I am converting an Ofna buggy. I was throwing the fail safe out with all the nitro stuff. One of the local idiots escaped for the village down the road and started bugging me about my set up. One thing lead to another and the argument was on. After 5 minutes of a couple of us arguing with him I left the store after he was thrown out of the store. Any ways my question is I don't need the fail safe from the nitro stuff right? The MM has it built into it if I am correct. The reason I ask is after arguing about it the idiot made me second guess my thinking. He was claiming the fail safe is built into the radio receiver. If thats the case then there is no need of one on a nitro. All RC's have a radio reciever. But I keep second guessing. Am I right?

I've never seen a reciever with a failsafe before. All I know of are stand-alone units that attach themselves between the reciever and ESC/throttle servo. Also it doesn't matter where your power comes from, electric OR nitro, a failsafe is a good idea.

Well, the guy was probably a moron, but he could have been refering to something like a DX2, DX3, etc. since they have built in failsafes. I don't think a failsafe is even necessary with a electric since all they do is make sure the throttle servo doesn't stick wide open when radio power is lost. If power is lost an a electric, it won't go anywhere anyway...

i depends on the receiver/speedcontroller.

I have a multiplex receiver with a 9920 speedcontroller. Once it looses signal it starts acting funny (WOT, left right, WOT, reverse etc etc)

With a Berg receiver the 9920 just stops functioning. the receiver starts blinking indicating something is wrong. (that receiver alone is worth a discussion, once i am using it on channel 52, and another person switches on his transmitter on channel 52, it will not respond to that. Reason for this (from my understanding) is that this receiver synchronizes with the carrying signal of the transmitter and listens careful to that)

That multiplex receiver hasn't got issues with my Quark controller though. The Quark recognizes a signal lost.

The failsafe module as known in nitro cars is used simple to apply brakes if signal is lost. (to put the servo in a certain programmed position)

Yeah, my DX3 has a failsafe built in and you can set the throttle/brake position and steering position for when it goes into failsafe mode. Electrics can do all sorts of weird things if you have a bad signal or some else is on the same or very close frequency, and the failsafes can activate if that sort of stuff happens.
The only problem with the failsafe modules in nitro cars is that when your rx packs gets thrown out of the car the failsafe module can't do anything and the servos stay where they were when you lost power....ahh fun times, especially in large open areas.

My Futaba 3PM 2.4Ghz radio has a fail safe built in where you also set the brake position if it happens to lose signal from the TX.

Many modern receivers do incorporate a failsafe-type of setting. Mostly this feature is added to the more expensive receivers, but some cheaper ones (like Hitecs) also have it.

And the MM does have a built-in failsafe, so there's no real need to use the receiver's failsafe (if it has one).

MM=Built in

Spektrum receiver=Built in

So really, you were both right.

If there's one thing I've learned about arguing, it's let the idiot talk, then clear it up after. That way you always look like the bigger man.

Thanks guys. Learned something new today.

True, no need to get into an argument over something like this unless either of you has paper work to prove it.