terencechan's blog View Details
Archive for May, 2008
Posted by terencechan | May 02, 2008 @ 04:08 AM | 27,375 Views
Hi folks,

I was so fascinated at the sight and sound of a full-sized Chinook warping the air, just above sea level with the coastal waters splashing up, forming a 'fountain' around it. What a magnificent sight it was, on National Day in Singapore.

Little did I know that I will be building a "Chinook" with a pair of Esky King1 kits a few months after that. It's really simple forward thinking that since a King1 heli uses a torque-tube for driving the tail rotor, one could easily hook up another King1 body to that shaft driven boom unit, replacing the tail rotor entirely.

The King1 Tandem will have a single outrunner driving the 1st rotor directly and the 2nd rotor driven via the torque-tube.

Ideally, the King's 275mm blades will be replaced by the Esky CP2's 246mm blades. The plan would have been 'flawless' in a flybarless Tandem setup.

To prevent the blade of one rotor from clashing against the flybar paddle of the other rotorhead, the CP2 blades need to be trimmed down to 200mm.

Arh, the same length as the blades you see on a 200-size micro model! The GAUI EP200 is a good example! Unfortunately, the EP200's blades have a narrow airfoil width and they can't generate enough lift to carry the bulky mass of two King1 bodies.

The 200-size SkyArtec Wasp V3 FP-heli has blades which measured '200mm x 30mm'. They generate enough lift but unfortunately, they are semi-symmetrical because they are designed for fixed-pitch's application.
V3 later...Continue Reading