Mach None (oz2285)
About this Plan
Mach None. Radio control sports model. For 2/3 channel RC and Cox Tee Dee .049-.051 power.
The original Mach None kit used the Ace foam wing. This here is a modern redrawn plan that shows details for a built-up wing construction.
Quote: "Before beginning construction let's analyze a few things about the Mach None. First, if you're a novice without much flying experience, put the kit on the shelf and wait until you've gained enough flying expertise that you feel you can handle a high performance airplane. Just because this airplane is powered by an .049 does not mean that it's a trainer for the beginner - the Mach None is truly a performance plane with the neutral stability, axial roll characteristics, smooth elevator response, high speed, and solid tracking of a modern competition aircraft.
A word of caution for those of you who believe that 'more is always better' and are already making plans to put a .10 or .15 engine in the Mach None to 'improve' its performance - DONT! First fly it as designed and discover for yourself what this package can do. Then if you insist on 'moving up' be prepared for a disappointment. It has been done with similar types of planes and a Max .10 produces little improvement while increasing all up weight considerably. A Max .15 has also been flown and at this point all resemblance to 'flying' ends and 'rocketry' begins.
For good information on break-in and care of the Cox Tee Dee engines, read Larry Renger's article in the February '74 issue of RCM.
It is a good idea to plan your radio installation before and during construction, especially with a small plane. If the full schedule of acrobatic maneuvers are required, it win be necessary to have coupled ailerons/rudder or a third servo for rudder. If everything but stuff like spins and snap rolls are OK, ailerons and elevator are quite sufficient. Don't throw the surfaces too much - keep the ailerons at ± 3/32 in (3/16 total) and elevator at ± 3/16 in (3/8 total).
If absolute neutral stability is desired, that is, if you want the plane to fly upside down exactly as it does right side up, the wing can be sanded to a more symmetrical airfoil by re-contouring the bottom of the front 1/3 of the wing. Because this changes the centerline of the front of the wing, 0° incidence will have to be reestablished by trimming the wing saddle at the rear.
If you're going to be flying in some tough, thick weeds it would probably be a good idea to protect the leading edge of the wing from dings with some 1/8 dowel embedded into the foam.
Keep the finish light. A lot of paint adds a lot of weight. The plane should come in at about 22 oz. all up otherwise the wing loading will be too high and performance will suffer...."
Note: for more detail and backstory on the initial development of the Mach None design, circa 1973, see the Owen Kampen Pacer (oz7186) listing, which includes a long and interesting article.
Update 23/12/2016: Added kit instructions, thanks to Gene.
Supplementary file notes
Kit instructions, 3 pages, OCR text and pics.
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User commentsHere is a picture of my old Mach None, built from the Ace kit [more pics 003]. Cannon 3 radio using 2 servos. That is my brother-in-law and my sister in the picture, circa 1978?
dfritzke - 24/10/2016
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