Mike484, I think i'l take you up on that offer. I've never seen autogyros in action. Should be pretty cool.Your in Houston, you should make it out to Anahauc one Saturday and visit us.
Draw a line from the front of your airfoil to the trailing edge and that is the chord line ..... the center of pressure on a rotor blade is usually about 25% Chord ( 25% back from the front of the airfoil) ..... that is where your pivot point has to be to change pitch ..... a very rigid blade is required for a cyclocopter model because centrifugal force is an enemy in this configuration .... that is why it should turn at a low rpm .... centrifugal force is a friend in the helicopter blade because the long unsupported blade needs CF to keep it straight ..... your blades have to also be perfectly balanced at the 25% chord pivot point otherwise your control linkages will be stressed or too hard to operate.If the hub diameter is also equal to the length of the airfoil. How do you get the length of the chord?
Sorry John ... I thought you meant my link .... the one that was in Daves first post is from 2008 and you are right ... it no longer works.When I click the link it's says. "Sorry, the website cyclocopter.snu.ac.kr cannot be found"
The Fanwing is something completely different but also quite interesting.