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S.R.B.M. idea

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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S.R.B.M. idea

Unread postAuthor: deathbyDWV » Thu Jun 04, 2009 2:00 pm

In this case S.R.B.M. doesn't stand for short range ballistic missile, but it stands for soda rocket bottle mortar. I was going to take an idea from this guy http://www.instructables.com/id/Gasoline-Powered-Soda-Bottle-Rocket-Launcher.-Desi/ but i wanted to use propane for the fuel and not have an air pump. Do you think it'll have good power at all or not really? I was thinking that his might just work much better because it is (kind of) a hybrid.
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Re: S.R.B.M. idea

Unread postAuthor: Technician1002 » Thu Jun 04, 2009 2:14 pm

deathbyDWV wrote:In this case S.R.B.M. doesn't stand for short range ballistic missile, but it stands for soda rocket bottle mortar. I was going to take an idea from this guy http://www.instructables.com/id/Gasoline-Powered-Soda-Bottle-Rocket-Launcher.-Desi/ but i wanted to use propane for the fuel and not have an air pump. Do you think it'll have good power at all or not really? I was thinking that his might just work much better because it is (kind of) a hybrid.


Propane provides a little less energy than gasoline. Using unpressurized instead of at 40 PSI shown in the video cuts the mass of fuel and oxidizer in the combustion chamber down to about 1/3. You can compensate some for the non pressurized chamber by making it a little larger and using a longer launch tube to accelerate over a longer distance using the lower pressure. In the dimensions given, the power will be considerably lower with propane and air if not under pressure.
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