Against common believe it is absolutely possible to beach even large
boats.
There are different techniques available.

For the boat from 20 - 50' the proper method can be seen he

http://www.esys.org/news/ship%20on%20the%20rocks.jpg

Note how the dingy does not require any special method and is plainly
dropped on the sand. The bigger boat however was not easy to maneuver
into its parking spot.


Should you have a very large boat like 100+' then maybe this technique
is for you:

http://www.esys.org/news/stena.jpg

Matt