Can be compared with the Estes B4-4, slightly lower peak trust than the B4-4 more burn time.
longer burning time for light weight models.
B7-3
Dia 12mm
length 50mm
impulse 4.85 N/sec
peak trust 6.9 N
Trust time 1.95 sec
Delay time 2.9 sec
fuel mass 2.55 gram
These engines are made in Poland for many years. And now Cavemanrocketry will take them to the rest of europe.
The engines come in two types black powder and composite.
These engines will give you the best bang for the buck you can imagine.