Project
Ignis engine.

Construction

• This engine contained a fuel formulation that I have decided will be the standard for the Ignis engine. The only change in this engine from later ones will be the size and number of nozzle retaining pins. On the engine pictured above there are eight 1/4" holes holding in the nozzle while on future tests there will be four 5/8" holes. The increased size allows for more surface area to be in contact with the nozzle and an easier method of assembly. The weight of this engine was 3.59 lbs. before firing and 1.73 lbs. after. This engine did not have a smoke charge or ejection charge that future engines will have. The throat diameter was 0.70" before firing and 0.82" after. The end cap was constructed with Perlite mixed with Pourstone to reduce the weight of the cap without reducing it's structural abilities. The fuel was a 60 / 40 mixture of sugar and Kno3.

Pros

• No metal parts.
• Nozzle retaining pins and end cap retaining pins are able to withstand the engines pressure without failure.
• Lightweight.
• Easy to construct.
• Inexpensive.

Cons

• None

Pictures

• Finished engine.
• The nozzle cut in half after firing.

Video

• Static test underwater of 60 / 40 engine.