Bobcat (oz6408)

 

Bobcat (oz6408) by Bob Martin from Bob Martin RC Models - 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

Kit review.
Construction manual.

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Bobcat (oz6408) by Bob Martin from Bob Martin RC Models - model pic

Datafile:
  • (oz6408)
    Bobcat
    by Bob Martin
    from Bob Martin RC Models
    78in span
    Glider R/C
    formers unchecked
  • Submitted: 04/03/2015
    Filesize: 1498KB
    Format: • PDFbitmap
    Credit*: MikeB

Bobcat (oz6408) by Bob Martin from Bob Martin RC Models - pic 003.jpg
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Bobcat (oz6408) by Bob Martin from Bob Martin RC Models - pic 004.jpg
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Bobcat (oz6408) by Bob Martin from Bob Martin RC Models - pic 005.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
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Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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