Sportmaster (oz2845)


Sportmaster (oz2845) by Lou Andrews 1967 - plan thumbnail

About this Plan

Sportmaster. Radio control model. Wingspan 65 in, for .45-.61 engines.

Direct submission to Outerzone.

Planfile includes full build instructions.

Quote: "Specific Notes on the SPORTMASTER: Well, just what can we tell you about flying that has not already been told in countless articles and by the most expert of flyers. Instead, we will say this: The SPORTMASTER you have chosen to build has been more than tested. It has been developed and tested and changes made through the course of twelve completely built and flown prototypes and pre-production prototypes. The prototypes have been constructed and flown by not only the expert but by rank beginners in multi.

From this kind of testing and exposure we are able to show such detail drawings and photography. From this kind of testing we are able to show the model set up for the all around average modeler and beginner rather than the more advanced flyer who generally has the knowledge to make almost anything fly.

The SPORTMASTER as built from the plans has a slight positive angle on the stabilizer and a slight positive angle of attack on the wing. The combination of the two positive angles of attack as built into the model results in about a 1/2 degree positive angle of attack of the wing above the stabilizer and thrust line. This combination in conjunction with the center of gravity shown on the plan makes for a very easy to fly model and not hairy so to speak and when trimmed straight out will fly hands off.

However, this can very easily and quickly be changed if you so desire by lowering the leading edge of the wing to zero out the wing with the stabilizer and moving the center of gravity back about 3/8" or leaving the center of gravity where it is and flying with a small amount of "UP" trim. With this set up you have to be flying the model every inch of the way and in the hands of an advanced modeler is a superb contest ship. About a 1/16" shim between the top of the leading edge of the wing and the wing bed will zero out the model as stated.

From actual and long testing, these are the recommended control surface movements as taken from neutrals:
AILERON: 3/8" up and 5/16" down
ELEVATOR: 7/16" up and 7/16 down
RUDDER : 7/8" left and 7/8" right.

The SPORTMASTER has larger moveable surfaces than most models and sure can be put to use if you dare for violent maneuvers like the snap rolls etc. and will be needed with the more advanced aerobatics as the free style which we inevitably and I am happy to think so, are coming into - it's about time.

By the way, the SPORTMASTER was officially clocked through electronic traps early this summer (we don't let anything go by us) at 90 mph downwind and 85 mph upwind with a muffler equipped but the prime holes left open MRC Enya 60. Don't let this scare you as I am led to understand that this is par for the course and anyway, the SPORTMASTER will fly just as slow as it will fast - we guarantee this.

If you do not like to fly fast, do not fly at full throttle as the SPORTMASTER flies beautifully at all speeds and just one other thing, don't let the wind bother you - we have flown the model in 35 mph winds and up.

Just one other fact again; if you clean up the nose by adding extra balsa and shaping like in one of the photographs, the model will increase in speed by better than 5 miles per hour..."

Update 1/12/2023: Added photo sheets showing detailed build pics, thanks to Duane Holliger.

Quote: "Here are scans of the 'Foto-Aid' sheet Andrews included in the kit. There were no separate instructions, just text on the plans."

Supplementary file notes

Foto-Aid sheets.


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Sportmaster (oz2845) by Lou Andrews 1967 - model pic

  • (oz2845)
    by Lou Andrews
    from AAmco
    65in span
    IC R/C LowWing Kit
    clean :)
    all formers complete :)
  • Submitted: 29/04/2012
    Filesize: 1430KB
    Format: • PDFbitmap
    Credit*: pd1
    Downloads: 4169

Sportmaster (oz2845) by Lou Andrews 1967 - pic 003.jpg
Sportmaster (oz2845) by Lou Andrews 1967 - pic 004.jpg
Sportmaster (oz2845) by Lou Andrews 1967 - pic 005.jpg
Sportmaster (oz2845) by Lou Andrews 1967 - pic 006.jpg
Sportmaster (oz2845) by Lou Andrews 1967 - pic 007.jpg

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