Bubba Clem. High performance 1/2A free flight power model. Wing area 234 sq in.
Quote: "Free-flighters have definite ideas about what their planes should look like and how they ought to perform. Some fliers swear by large lightweight ships that will glide forever. Others prefer small hot jobs that climb like scalded owls. Both the high-thrust underslung rudder jobs and the low-thrust rear-fin ships have their proponents, as do all variations in between. The combinations are limitless.
As Jim Clem fans know, Jim's designs have run the gamut of design parameters from the high-thrust Witch Doctor (oz2668) of the late Sixties, to the lightly loaded "Okie Bird" of the mid-Seventies, to the '79 reigning Nats champion, the Witch Hawk (oz4466). In each design, however, two traits have been in evidence - ease of construction and reliability of performance. So it is in the case of Jim's newest ship, the Bubba Clem. Departing from conventional planforms or combinations thereof, Jim elected to use a straight dihedral, a semi-high thrust line, and wing 'tiplets' on this ship. The result is an interesting-looking departure from contemporary airplanes that retains the contest-winning capabilities of Bubba's ancestors.
The name itself is also a distinct depar-ture from Jim's previous efforts and deserves additional comment. Quite appropriately, the plane was named after the Clems' oldest son, Steve (Bubba), who has helped Jim at the field and in the chasing of free-flight models since he was a young boy. Now 24 years old, Steve never complained about helping his dad, even though he personally never developed an interest in building or flying. 'Bubba' is Jim's way of honoring him.
Although unconventional in appearance, the ship has terrific contest potential. At 234 square inches, it falls into the scalded owl category as far as climb is concerned, yet its fairly high aspect-ratio produces excellent flight times, even without thermal help. Easily built and trimmed, Bubba employs balanced forces, needing no wash-in or wash-out in the wing panels, and only a small amount of rudder tab to get it to groove into its left-hand power pattern.
Construction Notes. Start construction by laying up the pylon blank and then cutting out the pylon and rudder pieces. Lay out the fuselage framework on the building board. Begin at the nose area with the 3/32 sq pieces, and then add the 1/8 x 3/8 in top and bottom longerons and formers..."
Bubba Clem, MAN, May 1981.
Direct submission to Outerzone.
Article pages, thanks to RFJ.
Did we get something wrong with this plan? That happens sometimes. Help us make a correction
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
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.
© Outerzone, 2011-2018.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.