Found Collection

by **J. Murr** » Wed, 13 Dec 1995 04:00:00

I am working on an RC Car with a built-in model-rocket igniting
system. I'll need a 3-channel Radio controller to do it, obviously.
I kinda need some help. I was lopoking to make it in the vague shape
of an Indy car design, but I'm not sure if it will work. I need
advice.

by **Alex Mat** » Sat, 16 Dec 1995 04:00:00

: I am working on an RC Car with a built-in model-rocket igniting
: system. I'll need a 3-channel Radio controller to do it, obviously.
: I kinda need some help. I was lopoking to make it in the vague shape
: of an Indy car design, but I'm not sure if it will work. I need
: advice.

Before you do anything by R/C, make sure that the system is totally secure
(i.e. ZERO interference). The setup should not operate at 49MHz or any
other popular frequency. Remember, lightning, electric discharges and
sparks (switches, motors, etc) of any type could trigger the receiver into
thinking its a command. The best setup would be one on a relatively clear
frequency, with some type of fancy setup (i.e. codes, spread spectrum,
garage door opener) that would prevent anything but your transmitter from
triggering a response. You don't want the rocket to go off in your face
when some kid uses his walkie talkie.

Hope this is of some help.
--
___________________________________________________________________________

"Man is free at the moment he wishes to be." - Voltaire
"Democracy is the theory that the common people
know what they want, and deserve to get it good and hard." - H.L. Mencken

by **MonkyTra** » Sat, 16 Dec 1995 04:00:00

To do this you will need a car that is heavy enough not to flip over upon
ignition. I have personally tried this with a check box with model
aircraft tires on it, and found that it was too lite, and flipped over
after going about 10 feet and spiraled around a flipped all over the place
untill it stopped burning. It woill also need a device, such as a pipe so
the ejection charge will not blow the car to pieces. finally you will
probably not want to steer it because at that speed it will flip.
i hope you can do this sucessfuly, because i haven't

Matt

by **Balthez** » Mon, 18 Dec 1995 04:00:00

I Agree - Too much impulse for a light car. How about an old DynaJet
engine. I believe these things put out 5 or 6 pounds of thrust for several
minutes and run on model airplane fuel.

Balthezar

by **Tobiah J. Sti** » Tue, 19 Dec 1995 04:00:00

Quote:

>I am working on an RC Car with a built-in model-rocket igniting
>system. I'll need a 3-channel Radio controller to do it, obviously.
>I kinda need some help. I was lopoking to make it in the vague shape
>of an Indy car design, but I'm not sure if it will work. I need
>advice.

I don't think that your idea will work at all. I built a rocket car
(not RC) and it blew up. Ok, it didn't blow up, but it did smash to
bits. Model rocket engines burn too quickly for cars, and give too
much thrust at once. You can try, but it will be a disapointment.

(All the above is IMHO)

-Toby

by **Jon Simmon** » Tue, 19 Dec 1995 04:00:00

Quote:

> >I am working on an RC Car with a built-in model-rocket igniting
> >system. I'll need a 3-channel Radio controller to do it, obviously.
> >I kinda need some help. I was lopoking to make it in the vague shape
> >of an Indy car design, but I'm not sure if it will work. I need
> >advice.

> I don't think that your idea will work at all. I built a rocket car
> (not RC) and it blew up. Ok, it didn't blow up, but it did smash to
> bits. Model rocket engines burn too quickly for cars, and give too
> much thrust at once. You can try, but it will be a disapointment.

> (All the above is IMHO)

> -Toby

Actually I saw an article on how to build your own RC rocket car in an RC
magazine several years ago. Not sure how well it worked, but if they put
it in a national magazine I HOPE it worked.

Though I do see your point, the rocket car would be kinda useless, unless you
were planning on doing quarter mile ( scale ) time trials or something, that
may be interesting.

Jon

--
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The opinions are my own,...Yackity Schmacity.

If I cared enough I would have a better .sig
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by **Stephen D. Robers** » Tue, 19 Dec 1995 04:00:00

I recall some guys working on duplicating the rocket powered salt flats
cars using model rocket technology. Their cars looked like a rocket with
wheels sticking out like an Indy car, and a single fin sticking up in
the back over the***pit.

The one thing I remember about this was that the car was NOT free to move
as it was held in place by a real long wire, like a 100-yard launch rod.
This kept the car in the lane and didn't let it get airborne.

by **Mark Johns** » Wed, 20 Dec 1995 04:00:00

Quote:

>I recall some guys working on duplicating the rocket powered salt flats
>cars using model rocket technology. Their cars looked like a rocket with
>wheels sticking out like an Indy car, and a single fin sticking up in
>the back over the***pit.
>The one thing I remember about this was that the car was NOT free to move
>as it was held in place by a real long wire, like a 100-yard launch rod.
>This kept the car in the lane and didn't let it get airborne.

Somebody also had a writeup in one of the model magazines about using AeroTech
motors in a 1/24 or 1/32 scale dragster. It was at least close to competitive
in performance with the big multi-cell electrics, but if I recall had problems
with getting prompt ignition...the electric in the other lane was long-gone
before they got the rocket motor lit.
================
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Voice: (316) 636-8189 [V+654-8189] 3718 N. Rock Rd.
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by **Andrew Broderic** » Thu, 21 Dec 1995 04:00:00

: : >
: : > >I am working on an RC Car with a built-in model-rocket igniting
: : > >system. I'll need a 3-channel Radio controller to do it, obviously.
: : > >I kinda need some help. I was lopoking to make it in the vague shape
: : > >of an Indy car design, but I'm not sure if it will work. I need
: : > >advice.
: : >

Tried that once. We spontaneously decided my brother's "Grasshopper" RC car
could use `D' power, so we found an old body shell, glued bits of wood
longways on it which the motor sat between, and taped it in place (it was
only meant to be used once !). Didn't try R/C ignition, but used my Estes
launch controller. He accelerated the car, and after a second I pushed the
button. I was too slow, and the igniter leads were yanked off the motor
too quickly. Tried again, and I pushed the button a little earlier.

Ignition ! I've never seen an R/C car move so quickly in my life. It was on
a less-than-even concrete path, but he kept it under control and wheels-down!
Probably because, and you may want to bear these suggestions in mind:

1) The car was a fully equipped RC car, and therefore quite heavy in relation
to both motor and thrust (the initial thrust spike of the `D' still gave it
a decent kick though)

2) The motor exhaust was slightly upwards as well as horizontal, thus helping
to pin the car down onto the `road'.

Best of luck - please report results !

ANdy B,
England.

Found Collection

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