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Not Tetranol, Tepanol aka HX-878. It participates in the crosslinking reaction and without it you need more curative. I did a batch without it one time just to see what would happen, it took weeks to cure to a bubble gum state...and the Ammonium Perchlorate could easily be rubbed out of the grain. I...

I am not actually using the pump to move the propellant. I am just using it during the process to remove the gas from the mix. I leave the mix in the mixing bowl, place a 1/2" lexan lid on it and pull a vacuum for about an hour. That gets much of the gas out. The pump is a 6CFM Yellow Jacket brand, ...

Todays casting session used Bates Grain configuration. Next session will include at least one moon burner grain. The session went very well. Found that casting 54mm grains was much easier to do than 38mm. There is a lot more room to get the mix in past the coring rod. The mixer worked very well, no ...

Today I am going to a friends house and we will be casting 48" of 54mm rocket propellent, around 3 Kg. Ground testing of a 6x1.9" grain motor and a 5x1.9" motor too. The grains are set up for a 38mm casing and 1.9" long. Simulations indicate around 650 NS for the 6 grain casing and 550 for the 5 gra...

What you really want is a slower controlled burn. If it is throwing chunks of propellant away from the mass, you'll increase your burning surface area dramatically and the motor will rupture. Burning surface area determines internal pressures in the motor. When surface area increases, so does pressu...

You don't want to use Chlorates for an oxidizer in a rocket motor, then tend to be pretty unstable. Better choices are; Potasium Nitrate (available at a garden center as stump remover, look for the words "contains Potasium Nitrate") Ammonium Nitrate, you'll want the phase stabilized stuff Ammonium P...

Hi Guys, I am new to the forum, but I play in rocketry a bunch...I am even making my own motors. I am currently making motors in the "J" impulse range (640NS-1280NS). I have never made any with KNO3/Epoxy, but Richard Nakka has. His website is here . He has a section devoted to KNO3/epoxy where he d...