Heli blades usually have lead weights epoxied into the tips, so as the blades spin they build up a fair amount of rotational inertia. When you are near the ground and ready to land, you add in collective to increase lift, and the inertia maintains head speed sufficient to execute a controlled landing. My personal favorite is inverted flight. If looks 'way cool to see a helicopter hovering inverted right above the grass. With a helicopter you have unbelievable versatility.
Helicopters can go so high they are out of sight.
Being able see the thing in order to control it is the only limit on how high they can fly. If you come across any additional tips that you would like to share with everyone please email them to me at this site.