correct, i understand what you are saying :) but rocket motors are so small that 3.5g of changing mass is almost negligible.
yes, this is for zero drag modeling only. I was just mentioning i can find Cd various ways etc.
ill have to look at your reply again. I did find a book online last...
this is just for simple estimates. I do know i would have to integrate etc, but for simplicity, you can use the big 3 to solve for velocity.
Vf = Vi = at
Vi = 0 so Vf is acceleration * time
i know the acceleration of the rocket motor i9n basic simple terms a= (Thrust - weight)/mass according...
good point. I do agree with that. I need to take account of the net force everywhere, not just acceleration. This works if i know the impulse, and force, which i do, but if i am only given impulse and time, then i have to find the thrust.
EDIT: for the first equation, i can not use 5.95N like...
without getting into ODEs and numerical methods, the 5.95 newtons is the amount of thrust the small rocket motor produces. Most likely constant for rough estimates of zero drag flight
i found this article which uses the smae method...
for second equation it would be v = (2.5*9.81)/(0.0357*9.81) = 70.02m/s = 229 fps, not 206. good catch. however, if i do it in freedom units, i do get 206
v= (0.5056*32.2)/0.0787Lbs = 206.86 f/s
for eq 1 its a =(thrust-rocket weight)/mass
then v = u +at u =0
a= 156.86m/s^2
t= 0.42 seconds
v...
Just going over some basic equations to help someone out and i have noticed that i get 2 different answers when using 2 different but very similar equations for impulse.
first eq. I=F*t
lets say that i have a small rocket motor that has a force of 5.95 newtons and a impulse of 2.5 n-s...
i have been messing around with desmos and started to add functions together. y=sqrt(x) -x -x^2 and things like this. but y=sqrt(x)-x produces a nice curve, then i went all fancy from an equation found in my airfoil design book. How the heck did they discover this equation back in the 50's...
yeah, its coming up with the functional shape thats tough to do haha.
i mean, how did engineers do this in the past before computers did curve fitting?
thanks
Ok, so i have done many math classes, as i am an engineer, however, a theory class and proof class i h ave not done, except maybe one haha.
here is my question, if i draw some sort of curved line by hand, how do i find an equation for that?
for example, i draw half of a tear drop but along...
im going to try and submit a bug report. Reason being, after reading multiple studies and research papers over the course of the last 8 or 9 days, my results for the first simulation fall within the same range as the papers. However, at the slower wind speeds, the papers ultimate load didnt...
i have about 60 hours into it so far.
Since i cant see the coding, i cant see what happens when i change one single variable like the wind speed. I guess i can ask the developer and see what he says.
I have read a lot of the user documentation that NREL wrote, but it doesnt always explain...
Yes I am a student haha.
The user manual for openfast and mlife say "ultimate load"
The dev of OPENFAST told me via the GitHub forums that ultimate load can be found 2 ways.
First is FEA
And second is by taking the max load of the time series data, and scaling it by a factor, until your...