In forward flight, attitude IS airspeed once accelerations have been resolved. Try this exercise with your students:
From level flight and using the same power setting, set an attiude to climb at the expense of airspeed. Leave the disk exaclty where it is during the climb. It will arrive at a particular aispeed +/- a knot or two. Excepting extreme Hp and Hd values, it will always give this speed for attitude selected.
It's important to show students this or they will keep staring at the airspeed indicator trying to get a desired airspeed. And sometimes chase it. Seeing the TPP is especially useful for teaching at ab initio level. H300 is great for this but very limited in application outside of training: R22; R44; B206 etc much better as private get-about machines.
R44 responds too slowly to accelerations to be a good ab initio trainer. It also has too much power (2 up). Learning that you can't always do everything a helicopter is capable of due to power limits is another important lesson (hence excercises covering performance).