I was going to add that. Can you please explain the equation (as what mi is) ... also, will I have to integrate the different centres of the aircraft? as will the centre of lift have to be different altogether than the centre of gravity, or can I balance it with trig??
Hello everyone
For the past 2 years I have slowly and agonisingly tried to make a flight simulator in http://www.blender.org" . I've gotten as far as this (regarding physics):
- got the Lift and Drag calculations
- got the thrust calculations
- got some REALLY basic roll calculations.
It is the...
AS I can see from WWII flight tables, the RPM has a few settings, making my job easier. As you said, torque is created by aerodynamic drag and lift, plus small inertia. Are there any calculations for this? The Aileron weight can be estimated and the area is simple. As for undercarriage drag, I...
Hello people. I've been making a sim of a P-51 Mustang in Blender3d and am working on the physics. I've got the Drag, Lift and Thrust with help from here. I need help now with:
Flight Dynamics (Roll, Yaw and Pitch physics)
I need to know the amount of force regarding torque on the aircraft...
Thanks alor Mr Reid. My calculations are done. I plotted the efficiency and set it with the advance ratio in my program and now thrust is fine.
This doesn't fit in with the name anymore, but could anyone help me with the roll, pitch and yaw physics now?
And how do the leaving the undercarriage...
Thx for pointing that out. The aircraft takes off comfortably with an Efficiency of 0.8-0.9 (the FOM is too low).
I have found some graphs on the propeller efficiency/advance ratio with the propeller pitch setting.
http://www.mudpond.org/fs_props.pdf"
I could use the graphs, or I could use...
These are my equations so far in my script
rho =
p_a = 9.909844 ## prop area
Mass = 34650
Vp = (power / (p_a * rho * 2))**(1/3.0) ## Air Velocity at the prop
Ve = 2 * Vp ## Air Velocity downstream
Thrust (T) = power / Vp
D = Drag
Force:
y = (T-D)
z = Lift (L)
The problem is that the aircraft...
What I don't undersatnd is how the Aircraft gets enough speed in this equation. 14675.72745/34650 = 0.423541918m/s = 1.524kmph. Does the Linear Velocity add? I tried this in my model and It worked too fast. Does rpm come in? If so, then force = 660407.7N, giving it a velcocity of 19m/s = 68.61kmph.
Ive understod the calculations.
The thrust is 14675N, but how can that power an aircraft with the weight of 34650N?
Does the figure of rpm come in? I've headed up an excel sheet and it all works out with the NASA calculations, but I need the calculation for overall thrust. I've got Lift and...
Thx for the help. It is going to take me a while to understand these. 1 more question (it may sound stupid)- does rpm increase with throttle and does that count in the equation.
<a while later>
I did a bit more :
Thrust = Vp^3 * 3.406 * 1.204 * 2
Vp^3 = 888.8*1000 / (3.4036 * 1.212 * 2)
Vp = 47.687m/s
the Value I am getting is higher than yours, meaning that something is wrong in my calculations.
Heres what I got so far (after about 10 mins):
At 80% efficiency of 1111kW of power, 0.8 * 1111 = 888.8kW
Engine is geared at a ratio of 479:1000
Vp = Velocity of air at the prop
Ve = Velocity of air downstream
Mf = Mass flow of the air
Swept area = 3.4036m2
888.8 kW = thrust(N) * Vp (m/s)...
thanks i got to look at that in detail. Unfortunately my computer died two days ago (a virus wiped out the motherboard). Luckily I kept backups. Thx ill see this in detail although converting is a bit tricky as I am using metric atm, but once these are done i can just convert ft/sec to m/s.