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Bell 47 H-1 |
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Bell 47 H-1 |
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Mechanics |
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It was decided that a stack frame design would be the easiest approach going forward given that moulded plastic/ nylon would be too expensive. To proceed and build a bespoke set of mechanics part were considered from commercial suppliers. The mechanics would utilise a number of components from the Hirobo Shuttle range and in particular the Shuttle RG that is also based upon a 2mm stacked frame. Such components as the main bearing blocks, engine mount, fuel tank, cooling fan, and tail boom support could be carried across from the Hirobo spare parts catalogue. |
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Different configurations for all of the required components were tried and after some considerable time an alternative design for the side frames was established. This new design, initially cut out of 2mm thick plastic card was compared with the profile of the fuselage to ensure that it met the size requirements. |
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The design of the side frames was then transferred from the prototype plastic card to a Computer Aided Design software package. The design was saved in a DXF file format and the files were emailed to Quick UK who were able to cut 2mm carbon plate accordingly. |
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The carbon plate, as expected, is very strong and light. |
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The mechanics are assembled with careful attention to where the next generation of design could be improved. If the mechanics prove to be successful an in depth illustration of their assembly will follow. However, for the project to proceed it must be established that the prototype mechanics work with acceptable flight characteristics. The project will not continue if the flight tests are not satisfactory!
Note that standard Hirobo Shuttle undercarriage has been used on this initial prototype and that lead has been secured, just above the front cross strut, to establish a neutral centre of gravity despite placing the battery as far forward as possible. |
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The flight tests prove very positive. Despite having no canopy the flying characteristics are very similar to a heavy Hirobo Shuttle; i.e. one with the training undercarriage attached. This will be ideal for scale flying routines. The project will now continue with focus on the scale aspects of the Bell 47 H-1. |
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Webmaster: John Neasham |
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