## Subsystem Accel

Accel computes the specific forces and accelerations of the aircraft, as measured in the aircraft's centre of gravity. The block Accel is contained in the subsystem Additional Outputs of the system Beaver. The outputs from Accel are not needed to solve the state equations. Hence, Accel can be removed from the system Beaver without affecting the solution of the state equations.

### Inputvectors: Ftot and Fgrav

      Ftot = [Fx Fy Fz]'  (total body-axes forces, coming from FMsort)

      Fgrav= [Xgr Ygr Zgr]' (body-axes forces due to gravity, coming
                                               from the block Gravity)

      Fx, Fy, Fz   : total forces along the aircraft's body-axes [N]
      Xgr, Ygr, Zgr: gravity forces along the aircraft's body-axes [N]

### Outputvector: yacc

      yacc = [Ax Ay Az axk ayk azk]'

      Ax, Ay, Az   : specific forces (= outputs of accelerometers) in
                     the centre of gravity of the aircraft [m/s^2]
      axk, ayk, azk: components of the accelerations of the c.g. along
                     the body-axes [m/s^2]

### Parameters to be defined in the Matlab workspace

- GM1: vector with some important geometrical properties of the 'Beaver' aircraft, and the mass of the aircraft (which is assumed to be constant during the motions of interest). Here, the mass m is extracted from the vector GM1. The vector GM1 can be loaded from file by calling DATLOAD. If the datafile does not yet exist, run MODBUILD first.