Engine kill mechanism

[unccpathfinder]

I havent tooled around with my RC's lately b/c of work, my real truck, the gf and the xbox but last night I had this dream about my Tmaxx...

Pretty much the FOC is the only way to save the spur gears as far as I can tell without going to aluminum or steel which I think will cause other problems in the drivelines...so I was thinking if a FOC was done that free's up a control on the transmitter and a motor on the chassis

so with this I envisioned setting up a "chock" that would be controlled by the fwd/rev switch that would no longer be needed with the FOC and the chock would engage the side of the flywheel when "switched on" and I would also intend on using a failsafe on it so if i were to get out of range or have the batteries take a crap it would just shut down instead of just apply the brakes plus I woudlnt have to pull the body to shut it off at the end of a run to stop it

Has anyone done this? and do you see anything bad with this? I searched but didn't really find anything of this nature...

Thanks

 

[HeartBreak]

I think your best bet would be to run a failsafe on the 3rd servo, with a cut-off valve as close to the carb as possible.

However, this has an inherent problem; air leak potential. Not to mention, it would cause the engine to run lean during "failsafe".

Personally, your best bet is to run a failsafe that applies brake and a throttle return spring to pull the carb closed.

If the carb is a rotary carb, a simple eyelet from the backplate of the engine, with a short spring to pull the carb closed would be enough.

If it's a slide carb, it'll take a little more work, but it's doable.

 

[unccpathfinder]

yea currently running a brake...but just always thinking of new things and that seemed to be an interesting way to kill it instead of pinching a fuel line or reaching in and stopping the flywheel with a finger I guess in my initial post I neglected to state that I wanted the "chock" to stop the flywheel

edited the original post to reflect this post...

 

[HeartBreak]

Oh, I think I know what you meant. HPI made a Safety stop kit for the savage some time ago. Perhaps that, with some linkage to push it would work.

 

[beason]

sounds like a good idea, but dont know if the little servo would have enough umph to press hard enough to stop it... worth a try though!

 

[unccpathfinder]

Hmm I guess I'll give it a try on my FrankenMAXX...I'll post results/pix once I get around to it...

 

[billyca412751]

All I have is a small return spring on my carb, it has already proven itself to work just fine. inexpensive but affective

 

[Rolex]

I can see having a 'chock' on a third channel to cut the engine, but as far as a failsafe, I would keep it on the throttle servo. If you run into a low battery situation, it takes a LOT less power to return the servo to neutral than it would take to apply power to another servo. Just looking to keep it safe.

 

[unccpathfinder]

good call didn't really think of low batteries on the truck side since I always kill transmitter batteries 1st but that makes perfect sense...thanks for the input

 

[ohmygahitscoby]

An engine kill mechanism would be nice, just don't have the time to mod my car, and there's no space for the servo to go anywhere. I've actually found that pushing in the clutch bell can stop the flywheel, but that can definitely kill the pressure plate.

 

[Rolex]

Well, I just ordered this today. I never knew there was anything like it. Found it on Ebay.
Here's what it looks like installed.

 

[frickenjoey]

I have one on my Savage, I like it pretty well. Works good. Much better than fuel line and over leaning the engine.

 

[HeartBreak]

Yup, that's the part right there (that Rolex posted a picture of). I've been thinking about putting one on my savage, but the only thing I don't like is how it sticks out... Seems like it could be hit easily.

 

[beason]

i had one on my savage, but i never ran it.. it didnt stick out to far though.. hpi did a good job on the rnd of that one.

nice thumb rolex!! did you go get a mani pedi?

 

[Rolex]

nice thumb rolex!! did you go get a mani pedi?

That's not my thumb, that's not my Savage. You don't see any polished alloy or yellow, do you? That's the pic that was in the ad for it. It's an ugly thumb, and a stock truck.
I just ordered it. It won't be here till next week.