Bi-Mini (oz3310)

About this Plan

Bi Mini. Radio control model. A half sized version of the KK Super 60 at 32in span, with biplane wings. For 2 function radio and .5 - .8 cc engines.

Quote: "The ubiquitous Keil Kraft Super Sixty (oz552) has been the subject of many a mod and redesign over the years. None so pretty as this cheeky two-winger from the board of RCME editor David Boddington.

It may surprise some of the modern generation or modellers weaned on a diet of GRP and veneered foam, that open structures can produce models that are capable of taking knocks and crashes better than their more 'solid' counterparts. The reasons for this apparent anomaly are two-fold. Open structires result in a lighter airframe so that the model requires less power (lighter engine) and flies slower (hits the ground with less force). A built-up airframe also retains a degree of flexibility and, when a knock does occur, the shock waves will cause the airframe to distort but not break. So put your blocks of foam away, lock up the glass cloth and resin, and start whittling away at the balsawood!

Decide, before you start building, what type of radio you are fitting and where it is to be installed. Don't use a larger nicad than a 225 mAh pack - a 150 mAh should be more than adequate for two function radio. Check the engine bearer spacing for the engine to be fitted, you can dispense with the bearers if a radial mounted engine is used, but retain the downthrust and side-thrust.

Fuselage side panels are built one above the other to ensure accuracy. Cyano adhesives can be used, although I prefer PVA white glues as this retains a certain flexibility when dry and helps to prevent joint separation in stress conditions. Joinn the fuselage sides with the front, full-width formers in position, slide the pre-drilled engine beares in position and check the engine mounting. Make sure that the fuselage remains true and square when the rear ends are brought together and the crosspieces added.

What type of fuel tank is fitted will depend on the engine used. As the Bi-Mini is not intended for advanced aerobatics, a free flight type tank will suffice..."

Direct submission to Outerzone. Scan by FredChamberlain, stitching and cleanup by pd1.

Supplementary file notes

Article text pages, with some pics.

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