Project
1105 Static

Post-flight Analysis

• This two phase engine was designed to test the KNO3/epoxy Nakka plug between phases. It is not a scale model of the Sugar Shot to Space engine but it is close to a 1/8 scale of the projected SS2S rocket.
  
• Each of the two phase engines is made with five bates grains each 1.5" by 3" sorbitol / KNO3. The chamber is 1.5 " by 16.25" schedule 40 PVC
  
• The first test was performed as a reference of a single engine to compare with the two phase one. We had some problems with the hydraulic load cell gage so the measure thrust is not a good indicator of the engine performance.
  

Construction

• Follow this link for more engine design data.

Pros

• Overall the test was a success demonstrating the efficiency of the Nakka plug and the possibility of a two phase PVC engine.
  

Cons

• The nozzle is not a good design even though they withstood the test. On the two phase engine when the second segment lit the plug apparently blocked the nozzle causing the a nozzle blowout.
  

Pictures

Video

• Single engine test.
• Dual engine test with delay plug.

Drawings

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