![]() ![]() The first might be fixed by driving the rotor head through a constant-velocity joint - torques and speeds for units used in automobiles are roughly compatible, and the operating conditions for the CV joint would be much better in a chopper than in autos because of the absence of shock loads. The obvious objection to this is vibration - a 2/rev lead-lag vibration due to angularity between the driveshaft and the rotor axis, and another one due to Coriolis effect produced by flapping. Why not revert to that? Eliminating collective pitch control is a harder nut to crack, but in an ultra-simple personal machine, with a very limited range of gross weights, perhaps lift control could be by rotor rpm alone? That might work especially well if the pilot, instead of controlling the throttle directly, instead controlled the setting of a speed governor, like an automotive cruise control. In autogyros, before there was cyclic pitch control, there was direct control of a gimballed rotor head by applying torques directly - first through an overhead yoke and later with a more conventional joystick. Simplifying and reducing cost comes down to simplifying the main rotor head and drive train. Not surprisingly, their Youtube video never shows it more than about six feet off the ground. I'm sure everybody on this forum who is interested in helicopters has had the same thought at some point: what would be the simplest and cheapest helicopter to build that would still retain all the key features of helicopters: ability to hover coupled with the option of autorotation in the event of a power failure? Send me a E-mail i will tell you where to get the plans and i will have Frank contact you,(if you wish) Frank builds mostly rotorcraft he will make parts for fixswing also he is excellent with rotorcraft, Thanks again Joe Bucciĭo you know where to obtain construction plans for the " little zipster " ? I would love to see the drive line in this aircraft. A` friend of mine is a aircraft builder (one of the best) i think he said it is not real stable this friend of mine knew Bensen he was one of the first ones in P.R.A when they started it. Hi my name is Joe Bucci I have a set of plans for the little zipster. Hola me gustaria tener mas fotos, y planos de este helicoptero para armarlo escala 1/48 por favor donde las consigo. Will u send me model sketch of your project let me know something about your project please I would really appreciate to get a sample of this ultra-light plans.I think he could be more stable if he was more compact. I’m looking for co-axial main rotor head details and drawings. Hello, I'm studding helicopter aerodynamics and i 'll like discover how works coaxial helicopter. HI,I am a fan of this Bensen B-9 "Little Zipster".Because i have no enough money to buy one,I want to make it by myself.Can you give me some suggestions? thank you very much! Live in Northern Colorado - Fort Collins with Many Resources SHOP,TOOLS,EQUIPMENT,TIME&MONEY(at the same time) Kenny Bx 57years old Metal Fabricator/ finding NOW is A good time to MAKE THIS HAPPEN. LIFE LONG DO IT MYSELF WANT/NEED TO BUILD & FLY! ! ! Seems the 1950's was crazy for helicopters! The three drawings that came with it looked realy good but had a of info. I got the plans today and went over then. If you have any information I am interested. ![]() Where did you find plans for the little zipster? I would like to get a set if possible. Bensen B-9 "Little Zipster" - visitors' commentsīy last date | by total length | by number ![]()
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