Boeing L-15 (oz11778)

About this Plan

Boeing L-15A. Free flight scale model. For rubber power or CO2 installation (also shown).

Direct submission to Outerzone.

Update 06/12/2019: Added article, thanks to RFJ.

Quote: "Build the Boeing L-15A, by Dick Struhl.

Here's a most unusual flying scale model, the Boeing L-15A. One quick glance at the photographs of the plane will tell you that the L-15A has the most unorthodox configuration of any service aircraft today. Truly the plane resembles a 'flying bath tub' with a tail boom. But no matter how unusual the design, it is the most efficient liaison type in the world. The L-15A was expressly designed and built to provide the versatile performance needed by the Army Ground Forces for observation, range-finding and liaison missions.

Powered by a 125 horsepower Lycoming engine, this little plane cruises at 101 miles per hour, with a total range of speeds from 50 to 112 miles per hour. The gross weight is just under 2,050 pounds and the useful load is 541 pounds. Wing span is 40 feet even and the length is 26 feet.

As the subject for a flying scale model, the L-15A leaves very little to be desired. The high wing and stabilizer, twin rudders, long moment arm, and the CLA position all add up to a stable, dependable flying model. Equally important is the ease of construction and ruggedness.

The use of wing flaps has made the flight pattern quite varied. With the flaps in the down position, the model has a slow forward speed but the climb is like an escalator - straight up! And with the flaps in the normal or zero position, the flight path is quite conventional, with a floating glide.

The model was originally de signed as a rubber-powered model but its 30 inch wingspan lends itself very nicely to CO2 power. The necessary modifications are shown in the plans. Note that it is necessary to run the rubber motor out through the back window of the fuselage to hook onto the end of the tail boom. Of course when you have the model on display, you can remove the rubber motor. Incidentally, don't fret about the slender tail boom, it has been tested under fourteen strands of 1/8 flat rubber fully wound with no ill effects.

Due to the size of our pages, plans must be presented one-half size, except for the wing and stabilizer ribs which are full size. The graphs on the plans are all 1/2 in squares, so the enlarging job really isn't too bad. But enough talk, let's get to the pleasant task of building the L-15A.

Build the fuselage over full-size drawings of the side view. Use firm grade 1/2 in square stock to make the basic fuselage framework. Build two sides, one directly upon the other for perfect align ment. When dry, remove from the plans and connect with 1/8 square cross members. Note that the ex-treme top portion of the fuselage under the leading edge of the wing is pushed out slightly over the rest of the fuselage..."

Supplementary file notes

Article.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction