Recent Content by Earl Boebert

  1. Earl Boebert
    Post

    Principles of Naval Architecture available

    I have a copy of the 11th printing of the 1939 edition dated 1958. Cheers, Earl
    Post by: Earl Boebert, Dec 1, 2020 in forum: Boat Design
  2. Earl Boebert
    Post

    Keel Bulb Design Software

    There is an old program used by model yacht builders that calculates the volume of a bulb whose form is a rotated NACA section: Marko's bulb...
    Post by: Earl Boebert, Nov 7, 2020 in forum: Sailboats
  3. Earl Boebert
    Post

    Designing on Paper

    Here is a folder that contains the old design web page from the U.S. Vintage Model Yacht Group. The material is copied from Thomas Moore's "Build...
    Post by: Earl Boebert, Apr 25, 2020 in forum: Boat Design
  4. Earl Boebert
    Post

    Sailboat directional stability: center of gravity (CG) related to center of lateral resistance (CLR)

    Agreed that the statement is nonsense. The question of directional stability was of significant concern to model yacht designers in the...
    Post by: Earl Boebert, Jan 27, 2020 in forum: Hydrodynamics and Aerodynamics
  5. Earl Boebert
    Post

    Tank testing for amateurs

    I have always wanted to test various radio sailing hulls (no scale effect involved -- the "model" is 1:1 of the actual radio boat) by putting a...
    Post by: Earl Boebert, Oct 31, 2019 in forum: Boat Design
  6. Earl Boebert
    Post

    AC 36 Foiling Monohulls

    No need to risk a physical presence in the vicinity. Plenty of satellite companies capable of tracking an object of that size. Cheers, Earl
    Post by: Earl Boebert, Oct 21, 2019 in forum: Sailboats
  7. Earl Boebert
    Post

    AC 36 Foiling Monohulls

    (Replying to CT249 above) Except there appear to be limitations on maneuverability imposed by the (relative to speed over water) slow motion of...
    Post by: Earl Boebert, Oct 8, 2019 in forum: Sailboats
  8. Earl Boebert
    Post

    The new SUN FAST 3300 with a double concave line

    Thanks for your reponse and sorry, I was unclear. I had the impression that you thought some of the Universal Rule J's had "guppy bellies" and...
    Post by: Earl Boebert, Oct 4, 2019 in forum: Sailboats
  9. Earl Boebert
    Post

    The new SUN FAST 3300 with a double concave line

    Which of the J's did you have in mind? (Not challenging, just curious). Cheers, Earl
    Post by: Earl Boebert, Oct 1, 2019 in forum: Sailboats
  10. Earl Boebert
    Post

    What the heck is this thing? A bell, a light?

    I've seen radar domes of roughly that size and shape. Cheers, Earl
    Post by: Earl Boebert, Aug 13, 2019 in forum: Boat Design
  11. Earl Boebert
    Post

    AC 36 Foiling Monohulls

    Tom Ehman (usual disclaimers) reports that the delivered foil arms are having to be repaired by the teams owing to surface delamination. [MEDIA]...
    Post by: Earl Boebert, Aug 11, 2019 in forum: Sailboats
  12. Earl Boebert
    Post

    AC 36 Foiling Monohulls

    First pics of the Luna Rossa boat:...
    Post by: Earl Boebert, Aug 9, 2019 in forum: Sailboats
  13. Earl Boebert
    Post

    AC 36 Foiling Monohulls

    Indications of/speculation about further delay from Tom Ehman at Sailing Illustrated. In video:...
    Post by: Earl Boebert, Aug 8, 2019 in forum: Sailboats
  14. Earl Boebert
    Post

    AC 36 Foiling Monohulls

    Well, of course. I labeled it as speculation, or as old-time intel analysts used to call them, a "tipper." Worth nothing in itself, but could lead...
    Post by: Earl Boebert, Jul 30, 2019 in forum: Sailboats
  15. Earl Boebert
    Post

    Transom pressure recovery or negative lift?

    My favorite observation about models comes from Alan Turing, in the preface to the last paper he wrote before he committed suicide: "... a...
    Post by: Earl Boebert, Jul 30, 2019 in forum: Hydrodynamics and Aerodynamics