SD-500 MkII (oz5947)

About this Plan

SD-500 MkII. RC pylon racer and sport model for .40 power.

Quote: "Designed as a pylon racer, this model features simple lines, low building costs and builds into a sport-type model with aerobatic abilities. With a hot .40 on the nose, it is a fast racer. SD-500 MkII by Val Ure.

Most modelers are basically the same when they pick up their latest magazine - a quick skim through for content and then they zero in on their pet section. By the time they get to read the articles about models, they have assessed all the latest ads, looked at photos. and studied drawings. Occasionally this quick skimming will interrupt your normal habit because a model catches your attention. How did you arrive at this part of the magazine? Was it the simplicity of construction that appealed to you? Simple lines of a .40 powered model with obvious low building cost, or did it meet your need for a simple, everyday, sport-type model with acrobatic abilities? Yes, it has all of those features, but with a hot .40 bolted to the nose, it is a fast pylon racer of the 15-500 class.

The SD-500 series were designed as pylon racers, with easy take-offs, landings that could be dragged in, stability and grooving qualities of a good pattern model. The parent design years ago started as a sport model, progressing onto the pylon circuits. The SD-500 started the other way and is now showing up in novice pattern events with success. Do you recognize the family lines? Well, straighten the wing, place it on the fuselage bottom, lenthen the nose, add some down and side thrust. Wallah! an RCM 15-500 (oz6031) that is what the SD-500 is with improvements in handling and flying.

Val Ure, an old buddy of mine for the past three decades is responsible for the SD-500 series design. He is well known in Canadian modeling circles and lately the western states arc becoming aware of his many talents.

We, in Canada, have AMA's counterpart known as the Model Aeronautical Association of Canada (MAAC). In their pylon rule book is a set of 15-500 rules known as the 'Winnipeg Rules' in an attempt to define minimum requirements for cross country competition. Some members in the local club and in the province felt they were too lax, advocating a one model design as the only way to go, stressing the RCM 15-500. An annual zone meeting almost became a disaster over this issue, but a one model design concept was lobbied through for a one year trial. Selection was delegated to the Pylon Committee between the RCM 15-500 and the SD-500. At this meeting, I volunteered (in a moment of weakness or frustration!) to make drawings of the model, if the design was selected..."

Update 31/08/2017: Replaced this plan with a clearer copy (restored text, rebuilt page gap) thanks to davidterrell80.

Supplementary file notes

Article pages, text and pics.

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