The question arose when I tried to update the thrust curve data for my Model Rocket Performance program.
The experimental data in Estes TR-11 shows well-built Alpha rockets reaching 116m on average with A8-5 engines. My program calculates this within +-2m using the original spike curve.
However, when I upgraded the thrust data for the 'new' A8-5 engines, I get 154m. Off by more than 32%.
Since the program works well for other engines; I think it's a data issue and not the code.
Which leads me to believe old A8 engines had only boost thrust and not sustainer thrust.
I guess for now, I'll just keep both old and new A8 engines in the database.