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  1. rtfm

    Hi, Great news! Yes, please send. Cheers, Duncan

    Hi, Great news! Yes, please send. Cheers, Duncan
  2. rtfm

    Partially Powered Rotor

    Hi Vance, Thank you for the detailed explanation. It has cleared up a number of things in my mind: There is a fixed ratio between the power applied to the prop and to the rotor. Some experimentation will be necessary to find this sweet spot. Not a project for the faint of heart, or the...
  3. rtfm

    Partially Powered Rotor

    Hi, This is an old thread, but I see no reason to proliferate threads when relevant threads already exist. I have read the posts here, and in the other larger threads dealing with partially powered rotors, and feel frustrated. Mostly the posts consist of questions, followed by telegraphic...
  4. rtfm

    Gyroplane Thrustlines vs. Center of Gravity

    Hi, I am not clear in my mind by what you mean by "partially powered". How do you achieve this? How much power do you give the rotor? What RRPM is possible with no help from the wind at all? Duncan
  5. rtfm

    Gyroplane Thrustlines vs. Center of Gravity

    No Title Hi, I have been working on just such a system. Basically, the mast is anchored to the keel by a second "teeter bolt", so that the mast can pivot fore/aft. All that is then required is a lever to adjust the angle. Perhaps either you or Vance could explain what you understand by...
  6. rtfm

    Gyroplane Thrustlines vs. Center of Gravity

    Hi Vance, I'm not sure I follow. I thought that a "partially powered rotor" meant powering the rotor up to a point, and then allowing the airstream to complete the task. Is my understanding incorrect? I refer to the initial post in this thread by C. Beatty. Regards, Duncan
  7. rtfm

    Gyroplane Thrustlines vs. Center of Gravity

    Hi, My understanding is that if one powers the rotor to (say) 95% of the usual flying RRPM, then there is very little left for the airflow to do, and in fact, very little airflow is required to add the extra 5%. The rotor is still unpowered since it would run on an over-run clutch. Since so...
  8. rtfm

    Gyroplane Thrustlines vs. Center of Gravity

    Hi Vance, Thank you. This is the sort of in-a-nutshell type of info I was looking for. Duncan
  9. rtfm

    Gyroplane Thrustlines vs. Center of Gravity

    Hi, I am steadily reading through this uber-thread, but so far I haven't come across any consideration of partially powered rotors (PPR) with respect to RTV. I know that PPR decreases the angle at which the rotor flies, and therefore the RTV. So, if one were trying to design a gyro which...
  10. rtfm

    Pitbull plans/drawings/owner's manual?

    Another option may be to either follow Dick DeGraw's lead and partially power the rotor, or use an over-run clutch on the prerotaror to ensure a minimum rotor speed - the idea being to keep the prerotator powered up in-flight.
  11. rtfm

    Pitbull plans/drawings/owner's manual?

    No Title Hi. Interesting paper, thank you. The "wings" I propose on my gyro are very small, but learning from the paper, I need to think about the wing AoA. Perhaps the wings can be mounted on a round tube (rather than a rectangular tube, as originally envisaged), with an adjustment on the...
  12. rtfm

    Pitbull plans/drawings/owner's manual?

    No Title Hi, That is extremely helpful. Thank you. I have scoured the web for photos, videos etc, and have just about everything that has been published on the web. But there's nothing like some good old 2-D drawings (however rudimentary) to use as a sanity check. My little design is obviously...
  13. rtfm

    Pitbull plans/drawings/owner's manual?

    Hi, I'm still busy building an AeroMax as well as a small aluminium fixed wing which I designed, so I'm in no hurry. But you know how it is - unless you do your planning well in advance, it inevitably comes back to bite you in the bum. As far as lessons are concerned, yes of course. It is...
  14. rtfm

    Pitbull plans/drawings/owner's manual?

    Hi, In writing to this forum, I'm appealing to probably the most informed group of gyro enthusiasts in the world. Well, I hope so. Because I would like very much to build a clone of the Pitbull gyro. Actually, not so much a clone, as an evolution of the design, since approximating any design...
  15. rtfm

    a tractor is born

    Hey Joe - what news? Hey Joe - what news? Hi Joe, I've been away from the forum for quite a while pursuing the design of a fixed wing airplane - the airframe of which would be an excellent platform for a tractor gyro. So I'm back to check out tractor gyros in general, and yours in particular...
  16. rtfm

    How much power?

    Hi, I don't understand... If the engine is rated at 120hp are the manufacturers lying about the output? Are the dyno graphs fake? Not sure I understand. Or are you basing 80hp on some lower throttle setting? Regards, Duncan
  17. rtfm

    Low Wing?

    Hi, You will certainly get some lift from the wing, but you are going to have to work out your wing's AoA so that you don't end up flying around the place with a stalled wing - producing a lot of drag and almost no lift. Apart from that, go for it. Sounds like an excellent idea to me...
  18. rtfm

    RTFM Blade Gyro concept

    Update on Bladerunner progress Update on Bladerunner progress Hi guys, I know some of you have been following my design/build progress, and I apologise for the slowness of the project. Basically I have to raid the tea-money to buy stuff to use on the gyro. I can manage only about $100 per...
  19. rtfm

    Increase speed

    Hi, One of the major issues facing anyone designing a winged gyro is the fact that at low speeds the wing is stalled, creating even more drag. The knack is to be able to adjust the wing's AoA so that at both low and high speeds it is optimal. I agree - the freewing design concept is hard to...
  20. rtfm

    A zero G tolerant rotorhead & blades

    Hi, I have spent some time away from this forum to concentrate on designing/building my project - so I must say I was pleasantly surprised on my return to discover your post. Most refreshing. I am not an engineer, so my design/build work tends of necessity to be iterative rather than...
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