Vertol Info needed
 

I have been thinking about a vertol. as I looking at the pics and drawings of chinook on Boeing's website, I realized that the front rotor has an approx. 10-degree of forward tilt.

it seemed that hirobo designed it's vertol the same way. does anyone know why it is designed that way? exactly how many degrees it tilts?

thanks

Wen

btw, anyon has one for sale? I like to get a used one to tinker with.