Bob Taylor's 1/3 Scale Sopwith Pup

A kit by Balsa USA
Photos and text by Doug Mills

Photo-courtesy of Balsa USA

Note: this kit is NOT suitable for beginners.


Wingspan:  108", Fuse length:  77",  Wing cord:  21",  Wing style:  Undercambered,  Wing area : 4,428 sq. in. (that's over 30 square feet!)  Wing loading:  approx. 16.7 oz/sq.ft.,  Estimated weight:  32 lbs,  Functions:  Rudder, elevator,  ailerons, throttle.  Basic construction: 1/8 in. ply, balsa, light ply, and fabric covering, Brushed aluminum cowl,  Finish: dope and custom mixed flat exterior latex, stained cabane and wing struts,  Servos: 5 ball bearing (throttle, dual aileron, pull-pull rudder and elevator),  Functional flying and landing wires,  Engine:  G62,  Gear: Custom built shock absorbing, fixed main, steerable tail wheel,  Wheels: 9" wire spoked mains and 2"  tail,  Fuel tank: 50 oz.  gas,  Prop: one 22X8,  Radio: JR PCM.  Dummy radial engine and machine gun are kits by Mick Reeves Models-UK

The first  group of  photos (taken early in late October, 2003) show the result of about three months planning, and building.

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The next group of photos was taken in late December 2003. The plane is about 90% complete. 

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The next group of photos were taken in February, 2004.  Working on the details!

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"The morning of June 30, 2004 and all systems are "go" for the Pup's maiden flight. Henry Bergen piloted the plane. Once off the ground, the plane went into a nose-up attitude. Even with full down trim and holding lots of down stick, Henry managed to bring the plane around the patch for a safe landing.  There was some discussion about the wing incidence being off slightly may be the problem. Henry did some adjusting of the flying wires on the stabilizer and made a second attempt. This seemed to help somewhat, but still a handful for Henry. He made a couple of passes and landed. And what a landing! The Pup just floated in! There was more discussion about the plane being tail heavy. This will be addressed later, and hopefully we'll see the plane fly again."

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This page was last updated on 04/22/10 .
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