hi all.  im currently doing a 4 year technical apprenticeship with a leading compnay who produce surveillance, protection, tracking, targeting, navigation & control and imaging systems.  as part of this apprenticeship i am studying several subjects at college.  one of these subjects is Statics and Dynamics.  My lecturer has given us the task of finding out the forces which act upon a helicopter during flight.  There are apparently 7 forces.  Does anyone know what any of these forces are?  Im not just going to sit back and let you guys answer for me     i am going to try and find out myself, but i thought i would the experiece/knowledge of everyone here to help me out.

Thanks in advance   

thanks for that.  yup they seem to be good, i found this site if anyone else is interested.

http://www.helicopterpage.com/html/forces.html

cheers