Bostonian T-Craft (oz7658)

 

Bostonian T-Craft (oz7658) by Larry Kruse from Flying Models 1982 - plan thumbnail

About this Plan

Bostonian T-Craft. Bostonian Taylorcraft. Rubber model. For Bostonian West rules.

Quote: "A scale-like gumbander for the popular new freeflight event. Bostonian 'T' Craft, by Larry Kruse.

The Bostonian Event, which originated on the east coast and then migrated to the west coast, has proven to be the most exciting concept to come along in freeflight since the advent of Peanut Scale. Reports from contests literally across the country speak of the popularity of the event. A Bostonian is simple, easy to build, and uses readily available materials. Typically, a Bostonian model can be built using 3/16 square balsa, a plastic propellor, and Japanese tissue covering - all usually needed to reach the 14 gram minimum weight of the Bostonian West rules.

One of the most attractive things about the Bostonian Event is that there is some small element of nostalgia built into it. Very few of us can look at a Bostonian model without thinking back to the 10c Comet kits or the Joe Ott scale job that introduced us to the wonders of flight years ago.

The Boston 'Tea-Craft' presented here is the product of just such whimsical remembrances on my part. One of the first planes I ever caused to fly in any sort of respectable manner was a little Megow Taylorcraft that spanned about 15 or 16 inches and flew into the very top branches of a neighbor's apricot tree on its first voyage aloft. That flight couldn't have been over 10 seconds long, but at that moment I knew just how Orville and Wilbur felt. And, because I've never quite recovered from that experience, this little ship is offered in the hopes that some other young person may partake of that magic through the Bostonian Event.

While construction is quite typical of any stick and tissue plane and should pose no problems for anyone who has built such model types before, some time will be spent on each facet of building in the hopes of answering any questions a novice builder might have. For those of you who feel confident of your building skills, skip the construction notes and go right to the building board. You can always come back if you get into trouble.

Fuselage: Pin the plans down to a flat building surface and cover them with Saran Wrap or waxed paper. Select (as nearly as possible) matching strips of 1/16 sq balsa for the fuselage longerons, both top and bottom, and pin all of the pieces for one side down and glue them in place. Try to cut joints as squarely as possible using a sharp single edged razor blade. Do not stick pins through the 1/16 balsa; rather, hold the pieces in place with two pins at each hold-down location by making an X with the pins over the top of each piece of balsa. I recommend the use of Hot Stuff's new gap-filling formula of cyanoacrylate for quicker building time.

After one side is complete, remove the pins and cover that side with Saran wrap. Now build the second side directly over it. One useful tip in an effort to get identical sides is to place the hold-down pins for the new side in the same pin holes you made in building the first side. If you look carefully at your plans, you can find them quite easily.

Once the fuselage sides are dry, install the crosspieces in the cabin area and bring the fuselage to a box shape. Check to make sure everything is square and then draw the nose and tail sections together, cementing in place the remaining crosspieces. The nose sheeting and bottom cowl blocks can then be glued in place and finally the noseblock can be carved and sanded to shape. Try for a good friction fit of the noseblock into the basic fuselage framework.

The landing gear is bent from music wire and laminated between two pieces of 1/16 balsa before being installed. The wheels are simple laminations of cross-grained sheet balsa with an aluminum tube bearing in the center. When the fuselage is complete, sand it carefully and dope it with at least three coats of thinned nitrate dope.

Flying surfaces: You have a choice of construction techniques in building the wing and the tail surfaces. I personally prefer the laminated method, but if you prefer, you may use the built-up method. Both are shown on the plan.

The built-up method is pretty much self-explanatory but laminating requires some detailed instruction. Start by cutting templates for the wing tip rudder from 1/8 scrap balsa, and stabilizer and cover them with Saran Wrap or a similar kitchen plastic. Cut several 3/32 strips from a sheet of 1/32 'A' grain balsa. 'A' grain is distinguished by its long grain marks and somewhat 'stringy' texture. I cut the strips 3/32 in rather than the finished size 1/16 to allow for some final sanding to size. Soak the strips in hot tap water laced with about 1/2 cup ammonia per gallon until they are pliable. The ammonia will both make the strips less subject to breaking during the laminating process and will cause the cellulose fibers to firm up considerably when the lamination is dry. Now brush a thin coating of white glue or Sig-Bond between two of the strips and draw them around whichever form you are working with. Use pins at about 1/4 in intervals to hold the strips in place until they are dry. Generally, I give balsa laminations at least 24 hours to dry before unpinning them.

The wing and tail assemblies themselves should be built flat on the building board in time honored and typical fashion, sanded smooth, and doped as the fuselage was. Construction begins with pinning the outline pieces in place for all three structures and then cementing in the crosspieces and ribs..."

Direct submission to Outerzone.

Update 29/04/2016: article pages, text & pics added, thanks to RFJ.

Supplementary file notes

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Bostonian T-Craft (oz7658) by Larry Kruse from Flying Models 1982 - model pic

Datafile:
  • (oz7658)
    Bostonian T-Craft
    by Larry Kruse
    from Flying Models (ref:610)
    September 1982 
    16in span
    Rubber F/F Cabin
    all formers complete :)
    got article :)
  • Submitted: 21/04/2016
    Filesize: 385KB
    Format: • PDFbitmap
    Credit*: JoeFergusson, Poacher

Bostonian T-Craft (oz7658) by Larry Kruse from Flying Models 1982 - pic 003.jpg
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Bostonian T-Craft (oz7658) by Larry Kruse from Flying Models 1982 - pic 004.jpg
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Scaling

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