Sopwith Pup (oz4128)

 

Sopwith Pup (oz4128) by David Beavor from Aeromodeller 1995 - plan thumbnail

About this Plan

Sopwith Pup. Scale RTP model WWI fighter biplane. 17.5 in span super scale model for electric RTP with Mabuchi 380 motor or similar on 12 Volts. Includes dummy rotary engine.

Quote: "Attention to detail has produced a superb model for Round-the-Pole flying. Sopwith Pup, by David Beavor.

We first saw this splendid model at the Model Engineer Exhibition where David flew it as part of the RTP demonstration put on by his ATC Squadron from Huntingdon.

Renowned as one of the finest scouts of WWI the Pup was, during 1916-1917, the only British plane that could take on the more powerful German Albatros. During its service career it was used by the Royal Navy for aircraft carrier trials, and by both the RFC and RAF as a fighter, night fighter, and trainer. Details of a typical Pup can be obtained at RAF Museum. Hendon. The Shuttleworth 'Pup', although a converted Dove, is also useful but there are differences in the rigging, struts, and cowling.

My model is powered by a Mabuchi 380, 12 volt electric motor driving a scale rotary engine and propeller, a combination that works extremely well. Construction is quite straight forward and, with the exception of the wing spars of hard 1/8 in sq balsa, the whole model can be built from 1/16 sheet balsa and small pieces of 1/32 ply.

Fuselage. Cut out the fuselage sides and farmers, face F1 and F2 with 1/32 ply and allow to dry. To stop the fuselage from bowing. 1/16 square strips are glued to the insides at scale positions. Drill F1 for binding the centre section struts and undercarriage. Curve the fuselage sides to conform to the plan outline and make up spacers. Starting from the front of the fuselage, glue the spacers and formers into position allowing the front and centre ones to dry before going on.

With all the spacers in place, the rear stringers can be fitted and sanded to shape. The side stringers are glued to the outside of the front fuselage and dummy formers glued between. Sand to shape.

Make the undercarriage front and rear struts from 20 swg and the axle from 18 swg piano wire. Bind the front strut to F2, temporarily fit the axle between front and rear struts (tape helps here). Bind the rear strut to the spacer and when satisfied, epoxy into place. Make up the tailskid and the tether hook..."

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Sopwith Pup (oz4128) by David Beavor from Aeromodeller 1995 - model pic

Datafile:

ScaleType:
  • Sopwith_Pup | help
    see Wikipedia | search Outerzone


    ScaleType: This (oz4128) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

    If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.


    Notes:
    ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/Sopwith_Pup
    Wikipedia page addresses may well change over time.
    For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
    Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.

Sopwith Pup (oz4128) by David Beavor from Aeromodeller 1995 - pic 003.jpg
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Sopwith Pup (oz4128) by David Beavor from Aeromodeller 1995 - pic 004.jpg
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Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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