About this Plan
Max. High performance 96in span thermal or slope soarer for 2 funtion control systems.
Quote: "MAX was built around New Year's Day 1970. After many flights with this sheet wing model I decided to use a similar system on a larger glider, and it proved very successful. After hitting the only telephone pole in Topanga Canyon, 1 can truthfully say it is very strong!
Max has flown in winds gusting to 25 mph with good penetration. During a trip to the Mojave Desert, I met my friend Jack Arkovitch and he invited me to try thermal soaring. I did not have a model with me but I used Jack's Windward (oz7879) model with which we drove to a tumbleweed covered dust bowl and set everything up. I thought he was nuts, as there was not a breath of wind and I couldn't feel any thermals.
Jack gave me the first flight, but from a beautiful launch right of the top of the line, the model came down almost as quick as it went up. During that brief flight, Jack was running around shouting: There's one, turn now, too late. But I still thought he was nuts - I didn't see anything!
So Jack took the next flight. I chuckled as I launched his model for him, another good launch to about 175 ft altitude off the line straight as an arrow, but this time the model did not sink. Jack said: There's a good one, and instantly put the aeroplane in an almost vertical bank.
It seemed to be chasing its tail, going up and up. I stopped chuckling and sat there and watched. We could just about see it now. so he spun it down and then caught another thermal - this time he let me fly it, unbelievable. I learned a lot from that introduction to R/C thermal soaring and have many thermal flights on 'Max' now. This simple attractive little design has paid for itself many times over in the pleasure it has given me, and I know that the design will give just as much enjoyment to you, so clear off that building board and buy in some good balsa!
Construction: Wing. Start with the left wing cutting to outline the bottom 3/32 sheet which is pinned flat to the building board. Add 3/8 sq to leading edge and hard 1/8 sheet balsa spars. When dry add all ribs except the root rib. Then cut the tip blocks to shape and glue into place. Repeat the building operation for the right wing panel. Let both panels dry overnight. Then, lay one panel flat on building board and block the other up 12 inches under its tip to achieve the correct dihedral angle, glue in 3/32 ply dihedral braces and add trailing edge blocks to the centre secion. Now carve the leading edge to section, best done with a razor plane. Thereafter, sand ribs and tip blocks smooth, chamfer lower sheeting along the trailing edge..."
Max, RCM&E, June 1977.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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