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.
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
by Henry Jex
from Air Trails
all formers complete :)
got article :)
Found online 11/01/2012 at:
Format: • PDFbitmap
Credit*: wtool, BillW, dfritzke
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsNo comments yet for this plan. Got something to say about this one?
Add a comment
* 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, 2011-2019.
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.