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'[OT][PETROCHEMICAL]Train Rockets Yada Yada...'
1999\10\15@005825 by paulb

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Dave VanHorn wrote:

>  You'd have to do it per car, of course, if you put all that on the
> front, the rest would derail. Messy.

 Still messy if the solid cored rocket calculated for a full truck
fired on an empty one.
--
 Cheers,
       Paul B.

1999\10\15@011054 by Dave VanHorn

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>   Still messy if the solid cored rocket calculated for a full truck
> fired on an empty one.

@home's sending my email way out of sequence, with dupes.

I said prev, that rockets set for a load of steel would be amusing with a
load of pigs.
Pigs Fly!

Basically, there's no way to make that approach go, but it has some amusing
ways it would not work..

1999\10\15@041609 by Mark Willis

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Dave VanHorn wrote:
>
> >   Still messy if the solid cored rocket calculated for a full truck
> > fired on an empty one.
>
> @home's sending my email way out of sequence, with dupes.
>
> I said prev, that rockets set for a load of steel would be amusing with a
> load of pigs.
> Pigs Fly!
>
> Basically, there's no way to make that approach go, but it has some amusing
> ways it would not work..

I mentioned something about load carrying penalty <G>

Easy to stop the engine from generating any net thrust forwards or
back;  have both forwards & rearwards facing nozzles on each engine.
Blow the "forward" facing one to brake;  When this car's empty, blow the
other nozzle cover, so your two thrusts cancel each other.

Still end up with, what, a 25% cargo weight carrying capacity loss, for
a rocket-assisted braking system?  And who'll pay the $100,000 system
refill bill, that driver who ran a crossing gate & then drove away fast
when the conductor pulled the "E-Stop" lanyard and narrowly missed them,
or the people paying to have the train carry their freight?  (Isn't
going to be the conductor!)

Can be done, and shouldn't...

 Mark

1999\10\15@054859 by Russell McMahon

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   From the PIC microprocessor list (believe it or not :-)
   Copied  to ARocket for obvious reasons :-)

*** The story so far :-)
***     Is it "practical" to use rockets to stop a train?
***     (each wagon has own rockets)
***     (No, I didn't start this thread !)
***
***  Now, read on ......

Real world weight penalty would be more like 5 percent, coz:

1g for 5s should be adequate.
V= at = 32f/s/s * 5s = 160f/s = 110mph !!!!

Ever seen a train stop from 100mph in 5 seconds under brakes alone? :-)
(A Porsche will, almost)

Isp of around 250 is achievable (HTPB/AP/Al)
For 1g accn about 1/(Isp) x total (wagon + load + rocket) mass is burnt per
second

so Total mass/fuel mass required =
   5/250/5 = 1/50th all up mass  = 2%

Actual motor weighs more than fuel but only about 10% for large solids.
So rocket = 2.2% of total mass.

If wagon mass = 20% of load mass (Anne ?) then  rocket =
2.2% x (120%/100%) = 2.6%ish

So 5% should be easily achievable

Thrust termination by blowout ports is a standard technique.

Multiple rockets per wagon would allow variable thrust levels.

But, I agree, it shouldnt be done (obviously).




     Russell McMahon
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>From another world - http://www.easttimor.com

What can one train-maniac* do?
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