Bristol Bulldog (oz2022)

About this Plan

Bristol Bulldog. Scale biplane free flight model. The model was designed by PJ Allnutt for 1 to 1.5cc motors. The wingspan is 33-3/4 in. Scale is 1/12. This is a modern redrawn plan in PDFvector format.

Quote: "WE ALWAYS LIKE to make personal acquaintance with our contributors particularly those who submit designs which are accepted for Plans Service but rarely do we expect anyone to call us from far off Toronto in Canada. Such was the case, however, when Peter Allnutt paid us a surprise visit! Being an airline employee Peter was able to make a trip back to the old country for his holiday and was able to spare some time to see how we were getting along with his drawing - and what a drawing! His 1/12th scale Bulldog has achieved some fame in Eastern Canada with its realism in flight and accuracy in detail. Peter sent us some colour photographs which unfortunately we cannot reproduce in anything but black and white and which serve to emphasise the intricate paintwork and engine detail applied to the prototype which is a prize winner in its own right.

Moreover, experience in the aircraft industry has taught Peter an appreciation of what is required by the scale enthusiast in the way of a model drawing and in consequence he has been able to really pile on the information in plan which is seen opposite.

In designing this 1/12th model, Peter Allnutt has followed closely the full-size structure of the Bulldog, particularly in the fuselage. The 1/8th sq basic structure is of spruce for the same reason that the full-size was of steel tubing namely strength.

Building this requires the laying down of two sides on the plan. The rear ends of the longerons, at last spacer position are cracked inwards or made into scarff joints. Forward spacers can be added to join fuselage sides, and then rear ends brought together reinforcing the joints with 1/8th gussets. Diagonal spacers are fitted, noting opposite direction of lower pieces.

The 1/8th ply reinforcements to which wire struts are bound, are drilled on the wire outline with fine holes and cemented in place. Four-piece formers F1 to F10 fit onto the basic fuselage structure. Note. F1 to F3 are from 1/8th ply.

Behind F3 a 1/4 in block is glued. This is faced with 3/32nd ply to which the 1/16 in 1/D undercarriage brass tube is sewn and glued. U/C can now be bent to shape from 16 s.w.g. piano wire. Cabane and lower centre section struts are made from cycle spokes with threaded ends outermost, and bound to the ply pieces on the forward fuselage..."

Update 19/10/2020: Replaced the PDF plan file with a clearer 2-colour version, thanks to Miguel.

Supplementary file notes

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