# Why are some dynamic derivatives not included in DATCOM file? [closed]

I am trying to understand Flight dynamics, particularly I am using Missile Datcom to get aerodynamic parameters of a missile, then use MATLAB, simulink to simulate its trajectory. It seems there are a lot of dynamic derivatives, have a look at this, look at some dynamics derivatives.
So why don't we have Normal-force derivatives due to yaw rate or Normal-force derivatives due to roll rate ? why don't we have Yawing-moment derivatives due to pitch rate ? etc...

• It depends on the File Type you look at. File Type 42 (the most recent) has more dynamic derivatives. (If I understood correctly your question)
– Afe
Mar 29 '19 at 18:24
• @Afe, I mean which dynamic derivatives do we need in order to simulate a flight of an aircraft? I see Cn, Ca, Cy, Cm, Cl,...(6 coefficients) and pitch rate, roll rate, yaw rate, rate of angle of attack, rate of side slip angle (5 rates) so we could have 6x5 = 30 dynamic derivatives. Why don't we have other dynamic derivatives like: yawing-moment derivatives due to rate of angle of attack?
– Dat
Mar 30 '19 at 1:48
– JZYL
Sep 1 '19 at 6:37

A nice reference to understand why coefficients are used if the book Boeing - Jet Transport Performance Methods.
• could you help me out, looking at mathworks.com/help/aeroblks/digitaldatcomforcesandmoments.html It seems like: $C_{L \space total} = C_{L \space static} + C_{L \space dyn} = C_L + (C_{Lq}q + C_{L\dot \alpha}\dot \alpha)(c_{bar}/2V)$. I understand static coefficient derivation, where do dynamic derivative contribution formulas come from ?