Ridge Runt. Slope aileron trainer. Wingspan 50in, area 275 sq in, weight 18 to 22 oz.
Quote: "Ridge Runt. A Slope Aileron Trainer that flies as good as it looks.
The Hobby Shack Ridge Runt was designed to be an aileron trainer for the pilot wishing to transition from rudder/elevator floaters. However, the experienced pilot will find it to be agile enough for basic aerobatics, and great fun for sport flying. Due to its simple construction and light weight, the Ridge Runt will fly on any slope in light to moderate winds. Its clean design will also allow it to fly in high wind conditions with the addition of a small amount of ballast.
The Ridge Runt can be flown several different ways: it can be flown from the slope, hand launched, high started, or even with a power pod. When flown from the slope, simply toss the model into the wind and fly back and forth across the face of the hill. Initially all turns should be made away from the hill till you feel comfortable with your model.
Although the Ridge runt was designed primarily for slope soaring, it has successfully been flown from a high start. The tow hook should be placed about 1/2 in ahead of the CG (center of gravity) for initial flights. Control inputs should be kept to a minimum during tow, as the model goes up the line very rapidly. Even though the model is quite small its light weight makes it capable of reasonable thermal flying. One advantage to its small size is that you can work small, fast moving thermals, even dust devils!
The model can be set up with a power pod in either a tractor or pusher configuration. For easy sport flying use a Cox Black Widow: for higher speed, aerobatic flight, use a Cox Tee Dee .049 or .051."
Quote: "So by now we have come to the most important point of every test report: the Flight Properties. The next bit is no undue adulation. The Ridge Runt really flies perfectly and - no matter if you go slope soaring or thermal soaring with the help of a tow line - this plane is easy and precise to control! Normal wide turns can be achieved just by using the ailerons - only when you want to produce real sharp circles is elevator movement needed. With the aid of both control sur-faces (ailerons and elevator) the Ridge Runt really shows where it's at - tight turns with the wings in a vertical position scratching just a hand's breadth over the slope's edge, one loop after another or slow rolls (if there is enough speed) are so simple to do that you really will enjoy it! When going slope soaring in strong winds, additional ballast underneath the centre of gravity is recommended - I take between 50g and 100g of lead.
It's not only when soaring at slopes that the Ridge Runt shows its good manners. You will enjoy this model just as much when doing high-starts from a tow line. While on the line the Ridge Runt is very stable without any tendencies to brake out and once off the line it reacts even on light thermal winds so that, with just a little kick you can manage to stay up soaring for hours!
The Ridge Runt has a wide range of speed. Due to its slim shape this model produces only low drag so you can fly it at the speed of an elderly jogger as well as at 50 kilometres per hour and more. Even at stall speed the Ridge Runt is very good-natured. First control surface actions slowly die down and then the model dives downwards in a very stable way without rolling to either one side.
At this point I have to thank my wife the for being so kind as to take the pictures of the Ridge Runt in the air - especially since she really is no fan of R/C models (this is still expressed in a very diplomatic way!). I also have to say thank you to Ditmar Geimer and Andreas Frede for their support during the many test flights with the high start line.
Conclusion. If there existed any kind of formula or equation for calculating the efficiency of a model airplane, taking into account kit price, building effort, looks and flight properties, the Ridge Runt would - despite its small dimensions - be not far away from 100%. This model is a fully fledged soarer and a good choice for intermediate pilots starting to fly models with ailerons as well as a perfect 'second' model for the experienced RC-pilot who needs something to take along during holidays. Anyhow, at a kit price of just £27.50, you can't go wrong with this model and will surely have a lot of fun!"
Note: the supplement instructions file is very good. 6 pages, complete with illustrations. Very thorough on construction details.
Update 07/08/2016: Re-scaled this plan to correct full size at 50in wingspan, thanks to anon.
Update 18/06/2018: added kit review from Aviation Modeller International, April 1996, thanks to RFJ.
Update 14/12/2018: Added further review from R/C Model World, May 1996, thanks to RFJ.
Instructions, thanks to turbojoe who posted the scans up onto RCGroups.
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