# of Aircraft Club Members - Math Formula Wanted

Hello,

I'm looking into different shared ownership arrangements, including
clubs, fractionals and partnerships.

I once spoke to a flying club member who said that the availability of
their club aircraft improved with 30 members and three aircraft
compared with 15 members and only two aircraft.

Is there any kind of mathematical formula that could take into account
the number of aircraft, the number of pilots, and predict what the
average aircraft availability would be? I imagine that fractional
companies must rely on something like this to help them decide how
many shares of an aircraft they can sell, and still keep their
availability promises.

Richard