Bobcat (oz6408)


Bobcat (oz6408) by Bob Martin 1985 - plan thumbnail

About this Plan

Bobcat. Radio control sailplane.

Hi Steve, Bob Martin's 'Bobcat'. Fun T-tail, aileron equipped sailplane. Note: there is a small amount of scanning distortion 'stretch' at the RHS of sheet 1 of this plan.

Quote: "Dynaflite Bobcat. F3B-style soarer, makes an ideal first aileron model. Strong turbulated wing allows winch launching and low-speeed sink. Rugged, lightweight bals/liteply construction.

Congratulations and thank you for purchasing the Dynaflite Bobcat. Once you have learned the basics of thermal flying, the Bobcat is an ideal second sailplane. With its flat wing and ailerons, the Bobcat is more maneuverable than beginner, two-channel, rudder-only models so you will be able to chase those elusive thermals more aggressively.

The Bobcat's relatively thin airfoil makes it penetrate the wind for competition flying and slope soaring, yet the flat bottom makes it somewhat of a floater as well. You can build the Bobcat with a steerable rudder, but only advanced fliers will be able to take full advantage of the additional steering capability. The instructions tell you how to build a steerable rudder or build a fixed, immovable rudder.

You can mount micro, mini or full size servos in the fuselage, but the ailerons require either a mini or a micro servo. Most experts will also use mini or micro servos in the fuselage. The generous cabin area allows the Bobcat to accept full size, standard configuration battery packs and receivers. Lets get started..."

Direct submission to Outerzone.

Update 05/06/2018: Added kit review from RCM&E, October 1983, thanks to RFJ.

Update 18/06/2018: Added construction manual, thanks to Geoffo.

Supplementary file notes



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Bobcat (oz6408) by Bob Martin 1985 - model pic


Bobcat (oz6408) by Bob Martin 1985 - pic 003.jpg
Bobcat (oz6408) by Bob Martin 1985 - pic 004.jpg
Bobcat (oz6408) by Bob Martin 1985 - pic 005.jpg
Bobcat (oz6408) by Bob Martin 1985 - pic 006.jpg

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User comments

Hi Steve, Looks like the model in the illustration has more dihedral than shown in the plan. Might be a good idea. The stab looks different from the plan, but that's probably not important. The plan looks like a variant on the House of Balsa Two Tee, except with ailerons, less dihedral, and possibly a wider rudder. If so, suggest fastening the horizontal stab with small nylon screws or something similar, to be replaced often. On my Two Tee, there was a "crack the whip" effect which meant that I was often making repairs. Sometimes the fuselage would break in the area of the front of the fin. Making the horizontal stab as light as possible ought to help with both of these problems. Making the stab easily detachable might be good for preventing hangar rash, which my Two Tee was very susceptible to. A vertical fin with a proper airfoil, if made as light as possible, might help by providing a wider gluing surface. The Two Tee was the first RC model I ever built. Seemed to fly ok, but I didn't know what I was doing back then. I learned how to thermal with it.
Lincoln - 17/03/2015
Changed the modelpic on this. It now shows the pics from the review article.
SteveWMD - 17/10/2018
Hello, anybody has a scan of all the ribs, especially of the outer sections?
Eduardo - 13/04/2021
This is closely related to Bob's Pussycat (oz7778) design.
Flattened out the wing added the t-tail and ailerons and I think he made a hand full of other changes.
The Pussycat was a wonderful floater, but the Bobcat never was a very good model. With a good amount of aileron differential you should be able to get it to fly, don't know if the instructions talk to this or not.
Wayne - 16/12/2023
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