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ckurz7000
Senior Member
Last Activity: Yesterday, 12:27 AM
Joined: 11-07-2006
Location: Vienna
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  • Higher rpm cause higher coriolis forces at higher flapping angles. And the drag difference between blades fore/aft and sideways is bigger. Both contribute to 2/rev.

    -- Chris.

    P.S.: I think the cord is 20 cm....
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  • Solo I cruise at around 175 km/h at a rrpm of about 360. Two up it is more like 160 km/h and 400 rrpm. If I didn't mistype on my calculator, that's a mu between 0.25-0.3 depending on the condition.

    -- Chris....
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    Last edited by ckurz7000; 09-20-2017, 11:36 PM.

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  • Watching those landings I find that actually very few of those pilots touch down at minimum sustainable airspeed. A bad idea when landing on a rough grass strip as you in crease the danger of bouncing or rolling over.

    -- Chris....
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  • Did I understand you correctly, Mike ? You put both accelerometers in the cockpit, pointing left/right and up/down and none on the mast?

    -- Chris.

    P.S.: I love your Don Quixote allusion :)
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    Last edited by ckurz7000; 09-19-2017, 11:59 PM.

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  • I, too, have flown quite extensively in both kinds of gyros: with and without castering nosewheel. I prefer the castoring type because of manoeuverability on the ground and a higher level of safety in cross wind landing situations. I agree with Jason in that an overheated break will render steering...
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    Last edited by ckurz7000; 09-20-2017, 04:22 AM.

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  • ckurz7000
    replied to Radio question
    A dipole antenna needs no ground plane and no grounding either. Just the coax connection, which goes to a device called a "balun" (probably integrated into the antenna somehow) and then to the antenna itself. That is different from a normal whip antenna which has a direct connection tonthe...
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  • ckurz7000
    replied to Radio question
    You are correct: if the radio cuts out also when you haven't been transmitting then that points to a different problem than SWR or antenna mismatch.

    That leaves two big areas for the fault to live in: power supply to the radio and the radio itself. You can't do much about the radio itself...
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  • ckurz7000
    replied to Rotor Blade Length
    Using "images" to mock up specific boundary conditions is a common technique used to solve some class of physics and math problems. I wouldn't call it plagiarizing just because it crops up in E&M as well as in fluid dynamics.

    The term "induced drag" holds nothing...
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  • ckurz7000
    replied to Radio question
    Mark, you should really contact some ham radio geek and ask him to do an SWR measurement on your radio system. This is an easy thing to perform and tells you a lot. You need to check the SWR over the enitre range from 118 to 137 MHz. Doing this requires about 10 minutes, and it is non-destructive. Modern...
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    Last edited by ckurz7000; 09-14-2017, 04:42 AM.

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  • Can you do that ?!? :)
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  • ckurz7000
    replied to Flying often when flight training.
    Yes, doing intellectual work in the air is a poor choice of venues. When flying you need to concentrate on carrying out a predetermined task.

    Further more, most people will not progress steadily at the same pace throughout training. There will be plateaus where seemingly nothing new is...
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  • ckurz7000
    replied to David from France
    Salut David, ravi de te rencontrer. Tu habites où dans le sud de la France ? La photo a-t-elle été prise près de chez toi? Si oui , il y a un aérodrome quelques part pas loin ? :))

    Greetings, -- Chris.
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  • So what's the other one? -- Chris.
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  • ckurz7000
    replied to Flying often when flight training.
    That's absolutely true. One has to adjust the hours spent flying per day to adapt to personal needs and abilities. It takes some time to process new information and sometimes flying twice a day can be too much. But doing it every day is definitely superior to doing only once a week.

    --...
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  • ckurz7000
    replied to Overcoming Preconceptions
    The divergence of your experience, Vance, might stem from the fact that the predator is a different beast from a Bensen gyro. Your minimum sink speed and best-glide speed and minimum-power-required speed are all probably quite different from those in the Bensen manual. Still, the shape of the curve...
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  • Do NOT attampt a zoom climb followed by a push-over!!! The rrpm you quote sound reasonable to me. What you should look at is the blade loading, i.e., the weight of the gyro in lbs. divided by the total area of both rotor blades. There is a recommended range of blade loading for each make of blades and...
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  • ckurz7000
    replied to Overcoming Preconceptions
    Yes, it is exactly this innate preconceived notion which gets re-inforced by everyday experiences like driving a car. A car will go wherever you point its nose. And when you step on the accelerator it will go faster.

    One experience that many people have is with boating. It is relatively...
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  • ckurz7000
    replied to Rotor Head Off-Set
    The slight lilt of the fuselage is less of a problem than the continual residual imbalance of torques around the longitudinal axis. This, plus the fact that a significant reduction of rotor thrust leads to a potentially catastrophic loss of stability around this axis.

    -- Chris....
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  • Thanks to all for the kind words. Writing a report and choosing some photos for me enhances the experience of the flight adventure. It's a pleasure sharing it with folks who can appreciate it.

    -- Chris....
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  • ckurz7000
    started a topic A quick 3-day vacation in Croatia.

    A quick 3-day vacation in Croatia.

    It's this time of year again, when one thinks of leaving home for places exotic or otherwise pleasurable. Even though this year we decided to stay home and have everyone come to visit us, the opportunity presented itself to lock up the house and take a brief sojourn. The Adriatic is only 2 hours per...
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