About this Plan
Gyration. Control line sport autogyro model for .19 to .25 engines.
Direct submission to Outerzone.
Update 22/11/2023: Added article, thanks to Pit.
Quote: "Just the tonic for jaded control-line fliers! An Autogyro to suit 0.19 - 0.25 engines, with a crowd pulling performance. Gyration, by Barry Swindles.
GYRATION was designed for use at displays given by the CL section of the Sudbury Model Flying Club, the original idea being to represent a helicopter gunship and attack on 'rebel forces' with suitable ground explosions set up by the Club's pyrotechnics expert. In the event, the model's flight performance alone turned out to be a real show-stopper, so there is no reason why it should not be finished to represent an air-sea rescue, oil rig supply, or any other type of helicopter that takes the builder's fancy.
Even if you don't fly in public displays, build one to entertain your fellow clubmen, or just for the fun of flying it. I must confess to leaving my trusty Crusader stunter languishing in the garage most Sunday mornings this summer whilst experimenting in getting Gyration into, and out of, the most incredible in-flight attitudes imaginable.
Construction is straightforward, but some basic metal working tools are necessary for making up the bellcrank assembly as drawn. Some builders may prefer to use other methods, but it is vital that the mechanism is light and free in operation as Gyration often flies with virtually no line tension at all!
The model is built around the engine bearer/main fuselage former assembly, and the bellcranks, throttle linkage and engine are all installed before the fuselage is built onto this main structure.
Commence by glueiug 1/8 x 3/8. balsa to the 3/8 sq Ramin engine bearers, and then assemble to former F2-F5 making sure everything is square - the rotor shaft should be bent to shape and attached with soft wire binding and epoxy resin to F4 beforee fixing to bearers. When thoroughly dry, the 1/8 ply bellcrank mounting plate is epoxied between the engine bearers in front of F4.
The bellcrank mechanism should now be made up and installed, it is based on one of the systems described by Mick Reeves in the November 1968 AeroModeller, and uses my adaptation of the pivot system described by Claus Maikis for his Commodore (oz3357) stunter in AeroModeller February 1973 (moral - you can always learn something from A/M's constructional articles, even if you don't build the model concerned).
The bellcranks are cut from 16 or 18 swg mild steel, drilled for leadouts and pushrods, but centre-popped only at the pivot point..."
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