On Monday, July 15, 2013 6:42:36 PM UTC-4, wrote:
You may have a right to be silent in your own home or on the public streets, but if you get caught on someone else's property you better be able to explain what you are doing there or the cops are within their rights to run you in.

I see no reason to say anything other than "I don't have an engine, I had no choice but to land here." Hand them ID, registration and insurance contact info. If the officer feels that you have broken a law, it is even more imperative to say nothing (and you most certainly do have the right to remain silent.) Your goal is to avoid wrongful conviction. Wrongful arrest is not the end of the world.

Watch a few minutes of the video that I posted above https://www.youtube.com/watch?v=6wXkI4t7nuc and see how statements by innocent people get them wrongfully convicted. Do you think that you are smart/lucky enough to avoid saying something that could be misconstrued? Do you think you are smart enough to know when you can speak freely to an officer and when you cannot? It is a much safer bet in any encounter with law enforcement to say nothing and wait until you have professional legal counsel.