Recent content by Alan_Cheatham

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    Help! Need to replace inner tube

    Here's another source of tubes:
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    Hang Balance VS. Flight Test Pilot of different weight

    I would suggest that if there is a significant weight difference between you and the test pilot that a second set of cheek plates be made for the test flying phase.
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    Ralph's electric prerotator for GyroBee

    Found an article by Ralph Taggart about his electric Gyrobee prerotator.
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    Ralph's electric prerotator for GyroBee

    Just FYI for history. Although this thread is titled electric prerotator most of the information and pictures are for Taggart's R/C glow engine version. Ralph did build and experiment with an electric prerotator also blade mounted, basically replacing the glow engines with electric motors and...
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    Flapping warning device

    Below a nominal rpm, which according to the manual appears to be set at 250, it is looking at a positive acceleration of the rotor to indicate a safe condition and a de-acceleration to indicate an unsafe or impending rotor flap. So the question is, does the rotor begin to de-accelerate if...
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    Flapping warning device

    That's not how it's operation is described in the manual, have a read.
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    Flapping warning device

    Interesting, it's looking at rotor acceleration or de-acceleration to assess a safe state, is there any review of the device somewhere?
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    Prerotator power required vs RRPM

    The problem with using a straight line graph is at first glance one might think that power vs rpm is linear and so doesn't develop the proper understanding of how much additional power is necessary to achieve the higher rotor rpms. Rotor power follows cube law, that is doubling rpm requires 8...
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    AR-1 N147AR - Florida - tail strike

    You could take rotor rpm and forward speed into account but if the pilot allows too much forward speed vs rotor rpm flapping angle will become excessive so it seems that an alarm based on flapping angle alone might be sufficient, an alarm that sounds at some angle before the rotor starts to hit...
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    AR-1 N147AR - Florida - tail strike

    Planes have stall angle alarms, gyros could benefit from a flap angle alarm.
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    Started building a DR1 helicopter

    With all due respect the welding is full of defects and is not of aircraft quality even for a homebuilt, no DAR worth their salt would pass such construction. I would suggest you consult with someone experienced in aircraft welding or if you are a member of the EAA one of their Technical...
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    Dominator Tandem Gyro (Davey's green monster)

    I believe that landing is part of the spot landing competition, you can see them measuring off the distance after the landing.
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    Clamp info.
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    Dominator Tandem Gyro (Davey's green monster)

    It appears in this video at 17:29
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    Installing toe/heel brakes.

    There's also Chuck Beaty's tire scuffing brakes he made for his ultralight gyro, pictures somewhere on the forum.