A10-PT Engines

This engine is good with the Blurzz dragster, but it is a little weak. The dragster still has not reached the end of its track.

I used 4 of the A10-PT's as the outboard engines (along with a D12 core) for my Estes Maxi-Brute Star Wars X-Wing that was entered for the Science Fiction/Future Scale NAR Regional meet at JSC in 2005. Launch and boost was a success, but the ending could have been better. The A10-PT was perfect for this application.

My question is this: How can the thrust duration be 0.8 seconds when the total impulse is 2.5 newton-seconds and the average thrust is 10 newtons? The duration in seconds must be one tenth the total impulse in newtons-seconds for the average thrust to be 10 newtons.