About this Plan
Aloha - Free flight CO2 model. All-sheet design, from Air Trails July 1949.
Quote: "Strictly a duration job, this Herkimer CO2 powered contest winner can snare the trophies for you, too.
ALOHA is a CO2 powered contest model. It won the first contest it entered and nearly equalled the National record of 9 minutes for its category. Flights are always over 2 minutes, regardless of weather, over 3 minutes in warm weather!
This fine performance is due to several unusual design features. Primarily, its very small size (90 square inches) and light weight (3.5 ounces) permit the use of a long motor run of nearly 2 minutes. A Schmitz-Luck type airfoil is used in conjunction with sheet construction for efficiency and simplicity. Airfoil parameters are: camber 5% at 25% chord with a 3% thickness and a sharp leading edge. Thin 1/16 sheet is perfect for this shape, and it preserves a true, unbroken airfoil throughout the span and chord. Unique struts keep this thin section from twisting or bending, yet allow adjustment for CG, warp, or removal.
Minimum drag is caused by the pod-and-boom fuselage. Rugged T-construction simplifies building, while the screw in the cartridge holder enables fairing of this usually awkward area. Engine and cartridge are also readily accessible and are not souped-up. A single-blade folding propeller makes efficient use of the gas energy, yet reduces glide drag immensely. Note that a reasonable diameter is used, along with higher-than-usual pitch and an efficient' airfoil. The single folder is almost necessary for contest performance.
After all this harping on efficiency, some may lift their eyebrows at the extreme adjustments used. However, using the incidences and CG position shown, flights are always consistent, are not critical on adjustments, and, most important, variations in engine power don't affect adjustments. Aloha may be flown with the CG as far back as 1/2 in from the trailing edge, but incidences must be carefully changed, so this is not recommended for the average flyer. Better still, follow settings exactly.
The fuselage is the more difficult, so knock it out first. Start with the 1/16 stiff balsa (quarter grain) boom. Cut the profile from 2 in sheet, including the pylon. Add the 1/32 hard balsa pylon pieces (grain vertical) and the 1/32 formers as shown on the plan..."
Update 08/10/2016: Replaced this plan with a clearer copy, thanks to dfritzke.
Supplementary file notes
Article pages, text and pic. Also, previous scan version.
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