About this Plan
Windfreak. Radio control model.
Quote: "Finally - an advanced flying wing sailplane design that will match the duration of the best conventional designs, while maintaining the legendary maneuverability of flying wings.
Flying wings have long intrigued me. but I have been very puzzled by their absence from the usual flying field. Furthermore, I have never Seen a truly competitive design used in competition. The reason for this state of affairs becomes rather obvious when one watches the flight performance of typical flying wings. They tend to have very poor glide slopes which result in poor duration, they seem to have to fly fast, have strange control behavior, and tend to be suicidal on tow.
At the same time, it is apparent from theory that flying wings should offer magnificent maneuverability and have an outstanding glide slope. Now, greater maneuverability and glide slope sounds ideal for a sailplane - why aren't people flying them? The answer is that nobody has developed a flying wing that would match or exceed the performance of conventional sairplahes.
I do not know why better flying wings haven't been developed, but felt that there was no good reason that one couldn't be developed. I have designed a long string of conventional salplanes, and some of these were not good performers, but some of them were outstanding. I felt that I had determined what would produce outstanding flight performance. Since flying wings are subject to the same laws of flight as conventional gliders. I believed that I could apply my experience and knowledge to a flying wing with excellent results.
The Windfreak was inspired by Ken Bates' 'Windlord', which it superficially resembles (Model Aviation, March 1978). However, the Windfreak is a totally different aircraft except for the same general wing planform. The important aerodynamic parameters are quite different; the airframe is grossly stronger and, probably most important, a much different airfoil is utilized. While I obviously feel that the Windlord can be improved upon, I nevertheless feel that Ken Bates' design was a giant step forward in the design of flying wings. The name Windfreak was partly derived from Windlord out of appreciation for Mr Bates' design. The 'freak' part of the name seemed appropriate because the ship is certainty the most unique ship one is likely to see at your local flying site.
In this article I will attempt to give some insight into how I go about designing a sailplane, some of the parameters involved, what the various parameters do, and the various compromises involved. Before we can design a sailplane, however, we must know what we want it to do, I, therefore, developed several performance goals I hoped to accomplish. These goals used Lee Renaud's Olympic II (oz5116) as a yardstick. I doff my hat to Mr Renaud...."
Hi Steve - Here is Rodger Sanders' Windfreak from Radio Control Models magazine issue 11-78.
Direct submission to Outerzone.
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User commentsAttached is a photo of my recently completed Windfreak from your plans [more pics 003]. Modified for electric power and dual elevator servos. It is an interesting build project and a great flying plane. Thermals well and has an amazing speed range. In hindsight I should have added spoilers; it just glides forever on landing. Thanks for providing the plans, I have built many planes from them and really appreciate all you do to make them available!
LorenB - 09/03/2018
Hi, Looks wonderful! I remember when they came out in the late 70's ...a dream airplane. Well done. I want to do an electric conversion as well. Next winter!
gapagod - 16/02/2019
That is a beautiful wing! Does it perform as well as it looks?
WimH - 28/04/2020
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