bitumen is cheap and readily available from many larger builders merchants and one block purchased will be more than a lifetimes supply .
It is easily casteable when hot. There has been a lot of research using it as a fuel with a solid powdered oxidising agents including ammonium perclorate (ref gilsonite )
it functions well as a reliable fuel when oxygen or nitrous oxide is blown through it ,
I am hoping to obtain a large nitrous oxide cylinder shortly to research burn rate and thrust .
I have oxygen on tap as a comparison.
The reason for this sudden interest is I have found a source of small disposable cylinders of nitrous oxide .
Thee cylinders are slightly larger than the disposable co2 cylinders used for soda syphons
They are purchased in packs of 5 or 25
Using these cylinders for rocket motor research would be costly hence the larger nitrous oxide cylinder I propose to rent for a year .
The question is can a viable model rocket be launched using a disposable NO2 cylinder and bitumen motor????.
If this work fails to produce a viable model rocket engine due to size/weight thrust and duration constraints I have the basis to build a variable controllable thrust large rocket motor for a bicycle or trike ride !!!!
if anyone has any tech info or would like to take part or borrow the cylinder or for example does anyone know how oxygen and NO2 compare as research using bitumen and oxygen is a very cheap option as I have a large oxygen bottle and regulator for gas cutting on the workshop outside wall. do post or pm