Koolhoven FK-58 (oz421)


Koolhoven FK-58 (oz421) by Alan Booton 1939 - plan thumbnail

About this Plan

Koolhoven FK-58. Free flight scale power model, by Alan Booton. Originally printed in Air Trails 1939 (see article) this is a later reprint by Golden Age Reproductions.

Quote: "THE Koolhoven FK-58 is a new Dutch fighter similar in appearance to many American sport planes, especially the Warner-powered Ryan SC. Four machine guns are carried, two in each wing beyond the landing gear retracting mechanism, and there is a small bay in the fuselage bottom in which light bombs may he carried.

The model is to scale, except for the flying propeller, and duplicates the prototype in miniature as to lightness, speed, and grace.

Fuselage and cowl. Prepare a 6 x 8 in plywood sheet by cementing 1/32 x 2 in sheets together, cross-grained, and let dry several hours under the pressure of books or other weights; then cut out all the formers except those noted.

Only the left side of the fuselage is built on the plan. This includes only the three 3/32 square longerons and the short 1/16 square piece and the formers. Pin the top and bottom longerons and keel form over the drawing (waxed paper between) and cement the formers over their respective stations. Where no longeron is present under a former, block it up the proper distance. (A coat of cement on former C where the bend is to come will probably make the bend just right.) Prebend the mid longeron and cement it in place.

When dry, remove the left half from the board and build the right half up to the same stage directly to the left half, then cover the front with 1/32 sheet as indicated and run the bamboo sliver fairing strips onto the rear. Rubber bands will hold the strips while they are being lined up to the dots on the formers..."

See article file for OCR text of original pages as printed in 1939, including 4 pages of drawings.

Supplementary file notes

Article thank to Kenny Horne.


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Koolhoven FK-58 (oz421) by Alan Booton 1939 - model pic


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Koolhoven FK-58 (oz421) by Alan Booton 1939 - pic 003.jpg
Koolhoven FK-58 (oz421) by Alan Booton 1939 - pic 004.jpg
Koolhoven FK-58 (oz421) by Alan Booton 1939 - pic 005.jpg

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User comments

Here's a real "oldie," a Koolhoven FK-58 [main pic]. Plan was printed in sections, full-sized in Air Trails Magazine, circa 1939. I constructed it in 1977. I remember that occasion because I suspended from the ceiling, directly above my son's crib...an attempt to induce the "model airplane gods" to influence his future. It was only partially successful as he doesn't build, only collects them...or rather an occasional example that I've constructed! I'll accept that.
The FK-58 was constructed in the Netherlands to fill a French contract. It seems the French Government had belatedly become aware of the storm gathering on their eastern border and decided they were a bit unprepared. The contract was only partially filled.... Was anyone prepared?
As for myself, the model was constructed as a control line model (CL)...complete with a third line-retractable landing gear. Note the plan's LG mechanism. Believe me when I say...that was a real challenge! I've included a photo of the actual aircraft [pic 005] which in my opinion is much more attractive than my model. Thank you Outerzone (Steve)...and especially you, Mary.
Neal Green - 13/04/2021
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