Spinks Akromaster (oz5824)
About this Plan
Spinks Akromaster. Semi-scale sports aerobatic model.
Quote: "We all have an idea of what a perfect model airplane should be. In most cases it is probably based upon the modeler's flying, building, and financiai abilities; and perhaps, geographical location. This is the story of my perfect airplane.
Three years ago, l found myself beyond the initial training stage in flying ability, after crashing Jim Kirkland's Beachcomber (oz7780), Nick Ziroll's Pitts Special (oz6003), and a self-designed 1000 sq in glider-type 'thing' that was never meant to do aerobatics with a ST 71. Thus, after learning the rudiments of flying the way a rot of us unfortunately seem to do, I was ready for an airplane that could train me through the intermediate stage and into expert flying. I decided that a large plane with precise, but not critical, flying characteristics was required. It should be capable of all aerobatics and, therefore be high powered with light weight.
About this time AAM (February 1970) carried a story on the Spinks Akromaster with an accompanying article about computer and wind tunnel designed airfoils by Dr Walter Good. Portions of both articles were incorporated into this design.
The model utilizes the symmetrical E-747 airfoil, which gives excellent inverted and slow speed performance. The model differs from true scale, in that the fuselage is narrower to expose the top cooling fins on the side-mounted ST 71. Big engines can develop heat problems if improperly cooled. I also thought it improved the model's appearance. The nose is altered slightly to facilitate cooling and building. The wing and tail have straight leading edges - also for easier building.
Although the plane is not designed for the novice buirder, the lines of the Akromaster adapt readily to simplified model design and rapid construction, Building speed might be shortened by using Profoam, in place of the formers and sleeting, on the top of the fuselage. The wing can also be easily made from foam, by using the base and tip templates shown on the plans.
The basic structure of the nose, the motor mount beams and three plywood formers including firewaH). should be epoxied together first. Cut out the 1/8 in alurminum mounting plate to fit your engine, drill the mounting holes for the plate in the maple beams, and mount the plate to the beams..."
Hi Steve - Here is Arnold P. Milton's Spinks Akromaster from American Aircraft Modeler magazine issue 06-74.
Direct submission to Outerzone.
Supplementary file notes
Article pages, text and pics.
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
Do you have a photo you'd like to submit for this page? Then email email@example.com
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.