calculus accuracy a simple single-stage rocket

[mionsky123-disa]

hello @all,

what is wrong by calculation? some results are difficult.

[AlvaroDíaz]

Seems that the problem is that you're using the propellant mass as a weight (and weights are forces). There are not issues using g in feets, but if formulas are taken for the definition of earth acceleration in US system maybe isn't that easy.

Regards. Alvaro.

[mionsky123-disa]

sorry, i say mass will usefull by impulse and momentum calculation.

ref. link

http://www.grc.nasa.gov/WWW/K-12/airplane/specimp.html

ref. example 4-1 from book "Rocket Propulsion Elements", Seventh Edition, GEORGE P. SUTTON
and OSCAR BIBLARZ.

The trajectory angle should under 80 deg to bee calculed also 79,3 deg. , the impact angle 79,7 deg.