Science a GoGo's Home Page Forums General Discussion Sci Fi Forum Orion, Mission to Alpha Centauri

F=[m*Ve]+[(Pt-Pa)*Ae]

do you see the (+) sign in the above formula?

lets do this one

number of oranges = 0 + 0

lets put some numbers in there

number of oranges = 8 + 8 = 16

then lets do it your way.

number of oranges = 0 + 8 = 8

all you are calculating is pressure times the nozzle area.

what if the fluid is methane do you think that you will get the same result in you formula if worked the way you say it can be worked?

methane
.717 kg/m^3
liquid methane
415 kg/m3

using 5000 m/s
methane
.717 * 5000 = 3585
liquid methane
415 * 5000 = 2075000

you cant leave this

out of this

or all you have is this


suppose each of the above also have 1000 psi pressure

we get your exact result for each of the above fluids no matter what fluid we use.

and where does the fluid velocity come from?

if you dont include it.

this is rocket science

F = q × Ve + (Pe - Pa) × Ae

where F = Thrust
q = Propellant mass flow rate
Ve = Velocity of exhaust gases
Pe = Pressure at nozzle exit
Pa = Ambient pressure
Ae = Area of nozzle exit

not what you put up.

The product of q*Ve is called the momentum, or velocity, thrust and the product (Pe-Pa)Ae is called the pressure thrust.

you are only including the pressure not the momentum of the mass , because you didnt include mass.

q = the amount of mass that passes through the nozzle.
Ve= the velocity of the mass that exits the nozzle.

you left out the most important part of the formula.