About this Plan
Tan-Giro. Control line gyrocopter sport model.
Quote: "You'll stop the show when you put this spectacular rotary-wing job aloft. In flight it looks just like a big tandem rotor helicopter with lines reminiscent of the Piasecki and Bristol machines. Although the appearance of the model is very close to the double-ended helicopter types it is really more closely related to the gyrodyne family - rotary wing machines which may rise up vertically, like a helicopter, but which depend upon a propeller for forward motion. In this respect it is somewhat similar to an autogyro.
To avoid mechanical complication our model uses a short ground run instead of vertical take-off. With this system it is not necessary to power the rotors and taking off with forward speed is more practical in a controlled model because it keep the lines tight.
Okay, it sound great, but how does it handle? Is it hard to fly? How does it behave in a breeze? The answers are that this model is actually easier to fly than the average sport job. The control response is very smooth and positive and it stays right out at the end of 50 foot lines with any good .19 as high as you'd care to fly any non-stunt type model of this weight, and the wind bothers it less than fixed wing models. There is a barely perceptible cyclic slap from the rotors, but, far from being a nuisance, this gives the "feel" of real rotary wing flying.
You do not require any particular knowledge of rotary-wing craft to build and fly it successfully. Begin with the fuselage which consists of two 3/32 x 3 x 36in sheet sides cut to shape. The bulkheads are 1/8in sheet and the two rotor mast carrying bulkheads should be cut from very hard stock, or else substitute plywood. You will note that the fuselage follows very conventional construction lines for sheet balsa building and requires little or no explanation except at the front end. This model differs from usual controlliners in that the elevating surfaces are at the front end instead of the tail..."
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User commentsThis is a fun design, actually Sept of '55. I built this model in the '80s for our C/L club's monthly contest. We had monthly member's contests to expose us to different disciplines of C/L flight such as carrier, racing etc. The month this flew was "the most unusual thing to fly". Rule was it had to take off, fly 7 laps without touching down. One member, an electronics engineer, insisted "it can't fly". It took off, had front rotor hub failure after two laps, and using full "up", completed the flight on the rear rotor in a 45 degree nose down attitude. Our engineer member repeatedly said "I saw it fly but it can't fly". Anyone building this needs to design a more substantial rotor hub. Also, balance the blades as I did not. We learned the lift forces are more than we expected and the advancing/retreating blade forces caused metal fatigue as in the photo. This model exists because it made only that one flight. There is new member interest in auto-giros as evidenced by gallery photos of your Otto the Giro (oz7346) plan. I did not win that month either.
EdShearer - 24/01/2018
A couple of photos of the just built Tan Giro from oz 9704 [more pics 006-008]. Not too sure about this one, so windows and other details will be added after it has flown (or not). I have modified the rotor hubs and blade attachments after reading about the hub failure suffered by a previous builder.
TrevorT - 21/02/2019
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