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Posted by Captain Dunsel | Feb 09, 2021 @ 10:31 AM | 12,422 Views
I like the KFM2 airfoilís performance and easy construction, but I donít like its looks. Trying to smoothly fair military insignia over the abrupt step is a pain. Getting rid of the step, whilst preserving the wing thickness and stall-gentling airfoil front, is my target.

So, I decided to build a simple test model with rubber-banded-on wings, switching between a KFM2 wing and a KFM2 with the area aft of the step filled in (i.e., a Ďfastbackí modification). For that testbed, I picked Ken Willardís Schoolboy.

Of course, Iím trying to kill a flock of birds with one stone. Iím trying several new (to me, at least) building and finishing ideas with the one model. Plus, having just finished a LASER-cut balsa kit, I want to compare my build results with the kit (I wasnít impressed with the kit, so Iím going to refrain from identifying the manufacturer).

Iím not new to building and flying R/C; Iíve been building and flying models for over 60 years. A few years ago, I realized Iíve developed an allergy to balsa, so Iíve switched over to foam. Weíve also moved to a newer, smaller home, with the resultant smaller workshop. That, plus the FAAís possible actions, has led me to build smaller models (happily, my wife is good with flying 8 to 10 ounce models).

I used Schoolboy plans from Outerzone, converted the .pdf to a .jpg, traced the outlines in LibreCAD, then resized them to a 216 in. sq. wing area. As Iíll be using a modern radio, not the escapement Ken Willard...Continue Reading
Posted by Captain Dunsel | Dec 03, 2020 @ 03:42 PM | 13,527 Views
Minimum R/C F8F ĎRarebearí Bearcat

Available direct from Minimum R/C ( or via

Span 360 MM (about 14 1/8Ē)
Weight, with 1 cell (200 MaH) lipo is 33 gm/1.25 oz.

Flight times are short (about 2 minutes), but very spirited. This little beastie is fast and highly maneuverable Ė loops, rolls, etc. are easy and quick, whilst the model isnít hard to land. There is no landing gear.

This is a simple kit, not an ARF. Parts are a stiff foam with LASER-cut control horns, servo mounts, etc. I used Foam-Cure and clear Gorilla glue when building it; CA is not recommended.

Building instructions (in English) are available via the Minimum RC website (

The kit comes in several levels, starting with just the airframe and motor at about $16. Next level adds the servos, and the full kit adds a 250 MaH lipo, tool kit, receiver and transmitter at about $95.

If you donít get the full kit, you will need a receiver. Minimum offers one, compatible with Flysky, Frsky, Spektrum DSM2, or S-fhss, for about $15. Their receiver includes a brushed ESC, and runs about $15.

Some MAJOR notes!

1. The receiver and servos come complete with all SERVO connectors, however there is a small charge for having the motor and ESC plugs installed by Minimum. After battling with those tiny connectors on the first receiver I bought, I found it absolutely worth paying...Continue Reading