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  1. btravis

    DIY Tug

    I'm interested.
  2. btravis

    RV-4 Questions

    I say go for it. The -4 is a great flying airplane, and I soloed mine without instruction in it. I had instruction in a champ, citabria and decathlon prior. the -4 is easier to land than all of them. I have talked to a lot of -4 owners, and no one seems to care about the early short legs...
  3. btravis

    Putting a tapered wing on an RV

    Just to throw in a data point, I have been racing my O-360 carbureted RV4 on and off for over 10 years. When I first started racing, I was turning in top TAS at 8000 ft of about 208 mph. I have consistently improved the aerodynamic drag of the airplane though out the years, and my airplane...
  4. btravis

    Aircraft Design and Design Testing

    BJC, I looked up "The Glider" on google and didn't find anything obviously design related? Could you be more specific, please? Maybe the actual web address?
  5. btravis

    $1 Dynamic Prop Balancer

    I've forgotten everything I learned in the mechanical vibrations class I had in college, but I do rememember that the eccentric motion of a stiff system lags the unbalanced mass by 90 deg. I don't remember why, but it some professor somewhere proved it to me once.
  6. btravis

    Part 23 Airworthiness Standards E-Book

    Another related question, does anyone have a PDF of part 23? Secondly, what does the constant Cn stand for in Figure A6 in appendix A? Brent
  7. btravis

    Spinner profile dimensions

    I was hoping for an equation that gives a good profile for coordinates. Also, since most of the WWII fighters spinners all look the same I thought there might be a NACA technical report on it.
  8. btravis

    Spinner profile dimensions

    Does anyone know a source for optimum spinner dimensions for a 250 mph tractor design. Is there a NACA report or something?
  9. btravis

    Schrenk's method part deux

    Now my head is hurting! I think the way to take this is that the basic lift coefficient means that the entire wing is making zero lift. i.e. some of the wing may be lifting, and some may be generating negative lift. Then the rest of the wing is considered at the same angle of attack and added...
  10. btravis

    Schrenk's method part deux

    True statement, but it doesn't help to understand the theory and how we understand lift to be generated. In talking to the gentleman in the part 23 certification office, he said that the schrenk method, CAM 04, and ANC 1(1) are all surprisingly accurate, and you can still certify an airplane...
  11. btravis

    Schrenk's method part deux

    By the way, one of the big problems I had with the Shcrenk paper was that the terms were not defined. There is another NACA paper TM 778 that seems to use similar nomenclature. Here is what I think they are, and I could be wrong so YMMV: t = wing chord x = distance along the span from the...
  12. btravis

    Schrenk's method part deux

    I have been looking heavily into the various methods of calculating the spanwise lift distribution lately. The best explanation I have seen of the schrenk method is in Peery's "Aircraft Structures" of all places. A table form for calculating using this method, slightly modified, is in the CAM 04...
  13. btravis

    ANC 1-1 Spanwise lift distribution

    Success! It arrived today, about 2 inches thick. So now you all know where to get it if you need to.
  14. btravis

    ANC 1-1 Spanwise lift distribution

    I contacted the small airplane division, and what do you know? The government is going to help me out. They have both documents, and are mailing them to me.
  15. btravis

    An interesting problem

    There are good deals on RV-4's occasionally, especially if they have the 150 hp engine. Mine cruises at 165 knots at 60% power (I have a 180 hp engine) at 8 gallons per hour. It does great gentleman aerobatics and could do more advanced stuff if I wanted to punish the airframe. I have done snap...
  16. btravis

    ANC 1-1 Spanwise lift distribution

    It is the Army - Navy - Civil Committee on aircraft design criterea. For instance, FAA Advisory Circulart AC-23-19A calls it out as an acceptable method of calculating the spanwise loading in the wing. I have a copy of ANC 12 which is Vibration and Flutter Prevention Handbook. I think these...
  17. btravis

    ANC 1-1 Spanwise lift distribution

    I have been trying to find a copy of ANC 1-1 aircraft design requirements for some time now since almost every textbook and technical report references it when calculating spanwise lift distribution. Does anyone have a copy they could PDF. As far as I can tell it is not available publicly...
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