David Oatham Posted September 21, 2020 Share Posted September 21, 2020 Hi all, has anyone built the 'Roto- Duo' autogyro that was a free plan in RCME June 2019 edition? If so it would be interesting to know how well it performed. As there was nothing currently on the building board, I thought I'd bash some balsa . It's got 2 rotors that spin in opposite directions, but the only steering control is provided by the rudder, which to be honest looks rather small !! One more thing, does anyone know how I can remove the windings of a couple of old brushless motors. These will be the bearings of the two rotors. I have successfully removed all of the magnets using a hot air gun but i'm struggling with the windings. Cheers for now, Dave Quote Link to comment Share on other sites More sharing options...
Phil Green Posted September 21, 2020 Share Posted September 21, 2020 Hi David, I was Shaun's helper when he flew the prototype at Ponty We had several flights with the Roto-Duo that afternoon, he even let me do a few circuits whilst he took some flying shots! I can confirm that the rudder has plenty of authority, in fact it handled in a similar manner to a fixed-wing rudder-only model - though apart from the STOL landings you do need to keep it moving forward all the time. We hand-launched as the grass was too long, but I have subsequently seen another one ROG and as long as the rotors are allowed plenty of time to get up to full speed it looked easy enough! Re the bearings - I'm not sure but I think Shaun left the windings in place, maybe I'm wrong, not sure. Hope this helps Cheers - Phil Quote Link to comment Share on other sites More sharing options...
David Oatham Posted September 21, 2020 Author Share Posted September 21, 2020 Thanks Phil, I was thinking of leaving the windings in place, I guess the weight saving would not be too significant. Quote Link to comment Share on other sites More sharing options...
michael cawood Posted September 21, 2020 Share Posted September 21, 2020 hi David, when i used to rewind full size 3 phase motors we used to get the old windings out by using an old wood chisel, or a hacking knife. we just used a mallet to cut a line down the front of the winding then peel it back and out. the first one was the hardest then the rest were easy. mike Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted September 22, 2020 Share Posted September 22, 2020 David, Another option would be to use THESE from Coolwind, I'm unfamiliar with the ROTO- DUO but Im sure they would be fine if the motor option doesn't work out. Rich Quote Link to comment Share on other sites More sharing options...
Haoyang Wang 1 Posted June 15, 2021 Share Posted June 15, 2021 Should the rotor axle be perpendicular to the top surface of the wing or to the bottom? From the magazine pictures, it seems that the control-horn mount is aligned to the wing bottom, while the motor-case mount is aligned to the top. There is about 10 degrees of difference. Thanks. Quote Link to comment Share on other sites More sharing options...
2.4g Shaun Posted June 15, 2021 Share Posted June 15, 2021 (edited) Hi, The stub axle is perpendicular to the wing bottom as seen on the control horn image. Carl feathered in his motor mount on the wing . I can see how it looks like it is mounted perpendicular to the wing top. The motor mount detail is shown on the plan. I hope that helps. Rgds, Shaun. (the designer) Edited June 15, 2021 by 2.4g Shaun Typo 1 Quote Link to comment Share on other sites More sharing options...
Haoyang Wang 1 Posted June 16, 2021 Share Posted June 16, 2021 Got it. Put the wedge on the top and align the axle to the bottom. Thanks. Quote Link to comment Share on other sites More sharing options...
Haoyang Wang 1 Posted June 20, 2021 Share Posted June 20, 2021 A question on the wing stub: The plan depicts its cross section in an airfoil shape, while in the photographs the wing stub looks more like a wedge with rounded corners. Should I sand the wing stub into an airfoil, or just round the corners and leave it as a wedge? A wedge will retain more woods, thus makes the wing stub stronger and more rigid. How thick should the wing stub be? Thanks again. Quote Link to comment Share on other sites More sharing options...
2.4g Shaun Posted June 20, 2021 Share Posted June 20, 2021 (edited) The original used a piece of preformed trailing edge stock. All the info is in the article and plan.. Don't you have the magazine to refer to? Edited June 20, 2021 by 2.4g Shaun Typo Quote Link to comment Share on other sites More sharing options...
2.4g Shaun Posted June 20, 2021 Share Posted June 20, 2021 The wing stub has plenty of rigidity. Use medium hard stock. It won't affect the flight performance if you just round it or make it an aerofoil section. Quote Link to comment Share on other sites More sharing options...
Haoyang Wang 1 Posted June 20, 2021 Share Posted June 20, 2021 Should I shape it more like A or B in the picture? Or should I make it thinner, like the "Typical Section" in the plan? Thanks. Quote Link to comment Share on other sites More sharing options...
Piers Bowlan Posted June 20, 2021 Share Posted June 20, 2021 I can't see that it would make the slightest difference to the way the model flies. As long as the stub wing is rigid enough for the task, suit yourself. People often (usually) deviate from plans to suit their own requirements, whims and available materials. Enjoy the build. ? Quote Link to comment Share on other sites More sharing options...
2.4g Shaun Posted June 20, 2021 Share Posted June 20, 2021 Shape A is how the prototype model was fashioned. Quote Link to comment Share on other sites More sharing options...
Haoyang Wang 1 Posted June 21, 2021 Share Posted June 21, 2021 9 hours ago, 2.4g Shaun said: Shape A is how the prototype model was fashioned. That's great! Shape A will be easy to do. Thank you for the clarification. Quote Link to comment Share on other sites More sharing options...
2.4g Shaun Posted June 21, 2021 Share Posted June 21, 2021 Don't forget to post some flying shots ? Quote Link to comment Share on other sites More sharing options...
Haoyang Wang 1 Posted August 29, 2021 Share Posted August 29, 2021 Finally got it fly today. It was breezy, but at least the rotors had no trouble spinning up. Here is the proof. https://youtu.be/xfY3FSSsagQ?t=100 Thank you for your help. It's fun! 1 Quote Link to comment Share on other sites More sharing options...
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