Model Forum / General / Rockets / March 2005

dependson how much extra power u want to try and get from the engine..
try a search on google for    "nitros kits"   keep "  the brackets in the
search

$4 to $6 a pound seems to be the number around here.  If I did the math
right that is about a third of a pound.  So a couple of dollars if you
include wastage?
    Will

It's typically in the range of $3.00 to $5.00 a pound, depending on
where you get your cylinders refilled.  How much you use per flight
depends on a *lot* of variables besides motor tank size.

For example, ambient temperature affects the nitrous density.  Colder
temperatures will result in a denser liquid, meaning you'll use more
nitrous per flight.  Also, the volume in your fill tube is wasted --
longer fill tubes waste more.  How long you keep the fill solenoid
open after you start to vent liquid also obviously affects the
quantity of wasted nitrous.

For a HyperTEK "J" tank (835cc, IIRC), you'll usually use less than
two pounds of nitrous, unless you vent for a long time, or have a leak
somewhere.  For a 200cc motor, you'll probably use around a pound,
counting wasteage. Only way to know for sure, however, is to actually
test with your specific GSE, so that you get a feel for what effect
your fill line volume, etc., have on total nitrous consumption per
launch.

Also, remember that you typically can't get the last bit out of the
bottle in a useful form.  So, a 5 pound bottle with a long fill tube
might only be good for 2 or 3 launches, even though actual nitrous
consumption would seem to indicate you could get 4 or 5 out of the
bottle....  As always, your mileage may vary.

- Rick "Gas passer" Dickinson

Why would you want NO2? Nitrogen Dioxide (very toxic)

Around here, if you're filling small cylinders, it's $4.50 per pound.
If you lease a 65lb bottle, including the lease, it drops to a little
under $4 per pound if you use one cylinder per year; it drops slowly as
you use more gas, as the cylinder lease is per year, so each additional
cylinder just has the gas cost, not the lease cost.

The $4/pound on lease assumes you can only use about 60lbs of the gas in
the cylinder -- you'll never get all of it into your motor.

-Kevin