Bi-play (oz339)

 

Bi-play - plan thumbnail image

About this Plan

Bi-play - Free flight model. Quirky Biplane design, lightweight model for a small .5 - 1cc motor.

Quote: "Model on the cover - a new look in biplanes for a wide range of .5 - 1.5cc engines.

WHY NOT a lightweight Bipe? The gap in our plans service range of sport designs was plainly obvious. We have the medium weights for all sizes of engine; but not a single one with large area for low power - and slow flight. Pete Holland set himself the task of filling the bill within a week and came through with this new approach with time to spare.

The result was born of a spot of stability research, and the desire to clean up orthodox slab side construction. With this in view, the following points were incorporated.

1. Large decalage and stagger.
2. Low CLA.
3. Knock-off wings with spring top tongue.
4. No elastic bands, struts, etc.
5. Streamline cabin.
6. Suitability for .5 to 1.5 motors.

These ingredients proved to meet the case, result was a job which can be taken out of the box, given full throttle and hurled with complete abandon!

Cut out fuselage formers and sides. Make celluloid tubes to fit 12 SWG u/c and bind to F3, not forgetting the 3/32 in ply packing piece on starboard side (this allows for wire thickness of torsion bar). Drill bearers and bolt in motor, cement bearers to F1 and F3. The motor will then hold the assembly true. Now cement 1/8 x 1/4 in jointing strips to fuselage sides and assemble sides, formers and bearer unit. Start at the tail with the fin TE, between the fuselage sides, and work forwards. Add fuselage bottom and cross pieces. The 1/16in sheet top decking is wrapped over in one piece each, fore and aft, after making up the correct width using butt joints as necessary..."

Update 02/10/2016: Replaced this plan with a clearer copy (patterned background removed) thanks to TonyP. Quote: "The Bi-play was very poor, apart from the line quality most of the fuselage formers were distorted among many other problems. I have therefore redrawn the entire plan."

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Bi-play - completed model photo

Datafile:

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User comments

Pete Holland has always been one of my favorite designers - each one of his models is refreshingly unique, and I reckon his 'Bi-Play' design is just the best. I retained a copy of the original 'Aeromodeller', April 1955, specifically because I knew I'd build it one day. That day arrived when the RCG '50 Plus Build-off' came about in 2016. I downloaded the OZ plan and after some consideration decided to increase the size from the original 45" span to 52''. My reasons for this were 'A' - to accommodate the mandatory (for me) radio gear, and also because I had a low-time OS 26 four-stroke engine looking for a home. AUW . 1.25kg. Mods I applied along the way were to build the wings as simple one-piece items comprising 'D-Box' construction and bolted into place rather than use the plug-in arrangement per plan. I also finished the front-end with a custom 'glass' cowling made from several layers of nylon stocking laid-up over a simple foam plug. It all came together better than I thought and it still has pride of place in my hangar [model photo & more pics 004, 005].
AlanW - 01/05/2019
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