www.pulse-jets.com

I'd like to know how far is UP!

The question is too broad. Think about what you actually want to know and ask again.

You could try filling the tubes with Sand...or filling with water and freezing it. I've seen some put a spring around it too. The Sand method has always worked best for me...

Then wouldn't it make more sense to inject the fuel under pressure and rely on air as the oxidizer? I doubt that you'd really get much appreciable thrust from what you suggest. How are you going to entrain atmospheric pressure air into a chamber that is running at 68 atmospheres. I've thought at tim...

fastnova & Ray - I have a better idea -- but, unfortunately, it doesn't belong on the Rocket Forum (unless you'd want to use it as a low-altitude booster or something). Anyway: Rig the little cannister so that when pierced, it blows into the front end of an eductor, so it will drag in a bunch of ai...

Your idea works and is available for purchase.

Seems pretty complex for only 11 N of total impulse.

http://www.aeroconsystems.com/motors/Sc ... reamer.htm

Enjoy

Go to Nakka's site and find out how he does it. Read the entire site. Everything you need to know is there...

You'll have to buy a scale, no way around it.

Going by volume just won't give you the results you want.

Now let me ask a simple question, why does the chamber volume increasing by N number of charges lower thrust? what is the difference between this discrete staged increase in volume and that of a progressive volume increase in a normal fuel grain and chamber? In a normal fuel grain there is an incre...

How much residue is left after combustion is complete (ash) Very little, most of the ash I see in a motor is from the casting tubes and liner...I sometimes find a small amount of Al2O3 on the convergent portion of the nozzle, but that depends on formula and pressure. Combustion is usually very comp...

mach diamonds in the exhaust are COOL, but speak to improper nozzle design...

Looks like a big motor.

I'm not a lawyer, so I can't speak the legality of making rocket motors. I do know that KN and Sugar aren't regulated substances... Mixing them together doesn't appear to make them a regulated substance (the ATF is starting down that path, but not there yet). Lots of people in the US make KN/Sugar m...

Why not core the grain slightly? Just take an appropriate sized drill bit and drill into the grain some distance. It'll increase burning surface area. You'll notice a shorter burn time, higher internal pressures and a nice smooth burn. Depending on how deep you drill and what size you drill you'll h...

OH MY. Catocene and Ferrocene are not for amateurs...scary stuff that even the professional motor builders (Aerojet, Thiokol, etc) avoid, except this one. Sub 20 micron AP can go high order. spontaneously...be very careful with the grinding. Use a ball mill with non sparking media. Treat the AP as a...

I am sure they are trying to please everyone while keeping us safe. Must be a hard job... Anyone know the nubmer of deaths or injuries caused by rockets per year, just wondering. Thats the point, they are claiming to try to keep us safe...they aren't doing it. Only a total moron of a terrorist woul...

it won't explode...it will overpressurize the case and go out. Overpressurization and explosion are very, very different things. Explosion is a very specific term...not to the ATF but to anyone that works in the field. It is something that has a supersonic burn rate...ie it burns at over 1100fps (ap...

If you ask the ATF they will tell you that APCP, ANCP and KNCP based rocket motors are under their regulations. BP motors that contain more than 62.5g of propellant would be under this rule as well. While they will tell you that these are regulated, their own regulations don't support that. APCP is...