Shooting software
Traj.xls a very easy to use spreadsheet to calculate rifle bullet trajectories and assist with sighting in at short ranges for a longer range. calculates and graphs the trajectory in relation to the line of sight
Forestry software
Length.xls a simulation of cutting to weight for a given helicopter payload produces tables and graphs .limited to 25 logs and no adjustment for volume functions . needs a grunty machine very math's intensive
IRR.xls a little spread sheet to calculate the Internal Rate of return and partners shares.
Weights.xls Two different types of log weight tables
one uses a center girth diameter and log length the center girth tables are as used by Timberlands West Coast and correct for rimu
the other uses the large end diameters and density to predict log length it uses rimu volume equations so it will need to be rewritten for other species
for further information