T-Beam (oz10815)


T-Beam - plan thumbnail image

About this Plan

T Beam. Free flight power sport model, for Brown Jr engine.

Quote: "Tackle This T-Beam Gas Job.

MANY gas modelers with limited working space have found that the larger power jobs are difficult to handle. Here, therefore, is a neat ship with a wing-span of but 54 inches, that is rugged, simple, dependable. Wing area is 300 sq in.

The fuselage is of T-beam construction, which makes a body that is strong, yet light. The longerons are cut to shape from sheet balsa and the T formed by gluing in the upper and lower ribs. Round off, then sand the job.

Make the nose of hard 1/8 sheet balsa, and the bottom of solid, hollowed out.

The ship may be powered with any motor, but one of the lighter ones may be advisable. If you wish to use a Brown Jr, move the wing and motor mount to the indicated position. This will necessitate the addition of an extra upright strut in rear of the mount. Weight may be added to the tail if the center of gravity is still too high.

The wing requires about 5 degrees incidence; the tail about 2. Adjust the tail and wing as needed in your particular ship.

Flying instructions are as usual. Fly the ship at a field with tall grass to help out in a crash. Don't power-fly the ship until you've gained a good glide. "

This is a hogal PDFvector plan tracing, at full size. See article for original (1/6 size) drawing, as published in the magazine in 1938.

Quote: "In January 2016 a copy of the original article for the T-Beam was posted (Flying Aces April 1938). The reason I remember it was that there was a keen discussion at the time about the wing dimensions, the correlation between the quoted dimensions was extremely poor. It was left with the thought that the draughtsman had made an error whilst doing the drawing.

So, I have completed a CAD tracing of the design and, sitting on the fence as normal, I have shown both the 45 in/300 sq inch and the 54 in/400 sq inch wing, anybody building the plane can decide which way to go."

Flying Aces April 1938.

Update 21/01/2019: Added alternate plan, scaled up from original print, thanks to Tony.

Quote: "Also the T-Beam plan from the Flying Aces magazine article scaled up with gimp2. I ended up re-drawing the wing and tail group for my build as once scaled up some slight inaccuracies show up, this being the reason I never submitted the plan - so your choice to use it or not. Thanks for the fabulous work you both do for us balsa builders. Cheers."

Supplementary file notes

Alternate plan.


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T-Beam - completed model photo



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User comments

I think it was an editor's mistake. The design is 44 in wingspan, not 54. Then the rib spacing and 300 sq in all work out. However, SAM has approved it as a 54 in model and lists the wing area at 340 sq in. From a flying point of view, this is better, although it leaves the stab somewhat undersized.
Simon Blake - 19/01/2019
Hello Steve and Mary, a couple of photos of the T-Beam completed in Sundancer's Complete A Project 2018 thread in the vintage forum at RC groups [model photo & more pics 003]. Thanks for the fabulous work you both do for us balsa builders.
Fizzle - 21/01/2019
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