Super Sportster 90/120 (oz5957)

 

Super Sportster 90/120 (oz5957) by Jim Feldmann, Don Anderson from RCMplans 1987 - plan thumbnail

About this Plan

Super Sportster 120. Radio control sport model. Wingspan 72in, wing area 950 sq in, for .90 or 1.20 engines. Model: pl-1006. Designed by Jim Feldmann & Don Anderson. Featured in RCM 12-87.

Quote: "Super Sportster 90/120. The definitive sport plane for 120 4-stroke power.

Back in 1973, a fellow named Joe Bridi designed a slick little 19 size sport plane called the RCM Sportster. Originally published as a construction article in November 1973 in RCM magazine, the RCM Sportster (oz6143) has a flat bottom airfoil and, although it's stable and fun to fly, its aerobatics are not what you'd call precise.

Then in 1981 along came Don Anderson and Great Planes Model Manufacturing Co. who purchased the rights to Bridi's kits (including the RCM Sportster). Don redesigned the Sportster as a 40 size airplane with a symmetrical airfoil, a full cowl and lots of little improvements here and there. Thus the Super Sportster (oz2633) was born, to be followed quickly by the Super Sportster 60 (oz10146), Sportster Bipe (oz6672) and Super Sportster 20 (oz7638). I don't have to tell you that the Great Plane's Sportsters are all outstanding fliers. They're so popular that I'm sure most modelers have seen at least one, and a lot of you have owned one.

Now, I happen to be a 4-stroke fan and to me the 120's are the neatest thing since proportional radios. It annoyed me that the only kits I could find for the 120's were either big and slow or else originally designed for 2-stroke 60's. Dropping a 120 into a 60 size airplane is usually not very successful because there isn't enough wing area to carry the weight (including lots of tail weight) and propellers just aren't available that will put that much power to use in such a small airplane. Big and slow avoids these problems, but I like to hot-dog it once in a while. I also happen to like Super Sportsters, so there was never any doubt that I would build a 120 size Super Sportster. I did, and I love it. It performs like a Super Sportster 60 but it's easier to fly, and its size and sound impress everyone...

The Super Sportster 90/120 (that's 90 2-stroke/120 4-stroke) is big (6 feet), light (9 to 10 pounds) and sturdy (plywood and spruce used in high stress areas). It was designed specifically to duplicate the performance of the Super Sportster 60, but because of its size, it's smoother and easier to fly. If you have soloed anything beyond a basic trainer you can fly this airplane. With a regular 120 swinging a 14 x 8, the Super Sportster 90/120 will do the entire FAI pattern and it flies like it's on rails. With an O.S. 120 Surpass turning a 14 x 10, the SS 90/120 is faster than most 60's. and has almost unlimited vertical performance, yet it lands slower than the 60. And when it goes by in a low pass it gives you such a visceral feeling of power that it's almost addictive.

All right, let's assume you'd like to build one. You have some decisions to make up front. Before you do anything else, decide on an engine. The Super Sportster 90/120 will fly on a .75 to 1.08 2-stroke or a .90 to 1.60 4-stroke. That's a large range of power and the choice affects the way you should build the airplane..."

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Super Sportster 90/120 (oz5957) by Jim Feldmann, Don Anderson from RCMplans 1987 - model pic

Datafile:

Super Sportster 90/120 (oz5957) by Jim Feldmann, Don Anderson from RCMplans 1987 - pic 003.jpg
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Super Sportster 90/120 (oz5957) by Jim Feldmann, Don Anderson from RCMplans 1987 - pic 004.jpg
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User comments

Hi Steve, I'm Luciano from Argentina. I've just finished an electric adaptation of this great flier and I'm sending you the photos [see more pics 003,004]. Don't have to add that it performs as good as the original! Congratulations for your wonderful webpage. Best wishes,
Luciano - 23/02/2015
I am also from arg I want to build the same, how many tables did you use?
jorge - 23/06/2019
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