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  1. kolibri282

    Asymmetrical vs Symmetrical Airfoil Rotor Blades

    We have a report of two polish researchers in our "Technical Papers, Books and Publications" section which might be of interest in this context: https://www.rotaryforum.com/threads/aerodynamic-design-of-modern-gyroplane-main-rotors.1137886/
  2. kolibri282

    Jump Takeoff Program

    The program below implements the formulae from naca-tn-528 "Analysis and Model Tests of Autogyro Jump-Takeoff" https://magentacloud.de/s/cz9NFxmxdcGKkzs You need to install octave, the free Matlab(R) clone, to use it.
  3. kolibri282

    Simulation Program for Rotary Wing Aircraft RotaryWingSim 2.0

    We have to distinguish between a real time simulation, which can be used in a flight simulator, and a mathematical model for aircraft development, which usually tries to capture everything that influences aircraft behaviour in a non negligible way. My program is a (probably poor) attempt to...
  4. kolibri282

    Simulation Program for Rotary Wing Aircraft RotaryWingSim 2.0

    Over the years I had received seven or eight requests for the software, three of them actually from China. Another one arrived just yesterday and I have uploaded the program to another server, since the link in the post above had been obsolete for years now. So if someone would like to have a...
  5. kolibri282

    Computer program user's manual for advanced general aviation propeller study

    If you go for another language, Glyn, I would join the effort. I have used C/C++, Java and Python quite a bit, plus a host of other languages to various degrees. I log in only sporadically so just drop me a message, I will be notified of this via e-mail. Cheers Jürgen
  6. kolibri282

    Gyrocopter Tracking

    The forum search engine has under performed as long as I can remember, but you can use Google to search a specific site. Entering: "Mike G balancing tips" site:rotaryforum.com returns results only from the rotaryforum server, and in the third one I found the attachment. Note the colon between...
  7. kolibri282

    I am feeling old.

    The beautiful glider reminds me of the word by Antoine de Saint-Exupery Il semble que la perfection soit atteinte non quand il n'y a plus rien a ajouter, mais quand il n'y a plus rien a retrancher. which roughly translates to Perfection is seemingly attained not when there is no longer...
  8. kolibri282

    Computer program user's manual for advanced general aviation propeller study

    The last company I worked with at one point used "Fossil Power" as part of its designation. I kept on using this to indicate: last century, but still kicking....;-)
  9. kolibri282

    OT: You'll never see the likes of this again

    That mus indeed have been impressive, Wayne! Judging from the nice picture you posted the cockpit must have been nearly 20 feet above the ground, what a beast that was: her foldable wing panels cover half a tennis court..., and yes, she really is a magnificent sight. As Brian pointed out this is...
  10. kolibri282

    OT: You'll never see the likes of this again

    Enjoy! https://toflyandfight.com/wp-content/gallery/post-wwii-photo-collection/xb70-scaled.jpg Bonus Pic: https://theaviationgeekclub.com/wp-content/uploads/2022/09/XB-70-YF-12.jpg
  11. kolibri282

    Bush Wheels / Balloon Tires ? Off Airport

    A report on the influence of larger tires on an aircraft is now available in the "Technical Papers, Books and Publications" section. https://www.rotaryforum.com/threads/aerodynamic-effects-of-oversized-tires-and-modified-landing-gear-on-a-small-utility-airplane.1148273/
  12. kolibri282

    Aerodynamic Effects of Oversized Tires and Modified Landing Gear on a Small Utility Airplane

    title: Aerodynamic Effects of Oversized Tires and Modified Landing Gear on a Small Utility Airplane authors: L.S. Miller, G.G. Thumann, S.A. Sanborn, and D.R. Ellis https://www.tc.faa.gov/its/worldpac/grants/96G011.pdf comment: Just in case anyone would like to get an idea what the effect of...
  13. kolibri282

    teach me about propeller 'chord'

    As with most technical designs there are so many trade offs between conflicting requirements that it is difficult to find a true optimum. This is much easier if you have a mathematical model and a computer program where you can apply optimization techniques to the problem. The report below...
  14. kolibri282

    Computer program user's manual for advanced general aviation propeller study

    title: Computer program user's manual for advanced general aviation propeller study author: Worobel, R. comment: the file contains a listing of a fortran program implementing the Hamilton Standard procedure for propeller calculation. The program is 26 pages, if you undertake it to convert it to...
  15. kolibri282

    teach me about propeller 'chord'

    Propeller chord enters into the performance calculation via the activity factor (AF). The AF is a weighted integral of blade chord along the blade. You can find the definition of AF on page 11 in the report below. The report was prepared by the venerable Rose Worobel, an icon amongst female...
  16. kolibri282

    Advance General Aviation Propeller Study

    title: Advance General Aviation Propeller Study author: Worobel, Rose; Mayo, Millard G. https://ntrs.nasa.gov/citations/19710025730
  17. kolibri282

    Henrich Focke — Inventor of the First Successful Helicopter

    Author(s): Berend G. van der Wall, Franklin D. Harris Title: Henrich Focke — Inventor of the First Successful Helicopter https://ntrs.nasa.gov/citations/20220014586 comment: van der Wall works at the German Aerospace Center (DLR), Harris is, of course well known in this forum. Two leading...
  18. kolibri282

    Simulation Program for Rotary Wing Aircraft RotaryWingSim 2.0

    The program for performance and stability calculation of various rotor craft - RotaryWingSim - is now available. The version number is 2.0 to distinguish it from the pure helicopter program 1.0. The program is a beta release which means it is far from complete or thoroughly tested, rather anyone...
  19. kolibri282

    Engine load model

    The article below might be useful when considering conversions: http://www.epi-eng.com/propeller_reduction_technology/gearbox_load_model.htm
  20. kolibri282

    Kellet YG-1 Data

    Dear all, a set of test data for the Kellet YG-1 Gyro is available here: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20100027414_2010030038.pdf Happy Simming!
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