air at constant pressure 1003 5 j kg k c v specific heat of air at constant volume 716 8 j kg k h r specific heat ratio of air 1 4 ambient 1 36 within and ideal case for nozzle ma mass flow rate of air only in ramjet mode and of exhaust only in pulsejet mode f m a specific thrust special unit of measure u201c newton of thrust per kilogram per second of exhaust gas u201d tsfc specific fuel consumption special unit of measure u201c kilogram per second of fuel per newton of thrust u201d f t 04 t 0a u2212 1 q r c p t 0a u2212 t 04 t 0a f t 04 t 0a u2212 1 q r c v t 0a u2212 t 04 t 0a m e 2 2 h r u2212 1 1 h r u2212 1 2 m 2 p 06 p 0a p a p e h r u2212 1 h r u2212 1 v e m e h r r t 04 1 me 2 h r u2212 1 2 0 5 f m a v e 1 f a e p e u2212 p a m a f m a v e 1 f u2212 v a e p e u2212 p a m a environment t a 290 k p a 101325 p a t 04 2000 k air density 1 225 kg m 3 before first pulse p 02 p a t 02 t a no speed yet assuming perfect gas behavior p 06 p 0a t 06 t 0a so p 06 698793 1 pa to avoid shock formation at exhaust.