Doug Halsey's Recent Activity

  1. Doug Halsey replied to the thread Was Marchaj having us on?.

    A better question would be "Are you just trolling us?"

    Apr 12, 2021 at 6:18 PM
  2. Doug Halsey replied to the thread Vortices as source of aerodynamic force?.

    One thing you're missing is that it's very important that the sail produce a side force for the keel or centerboard to lift against. If...

    Apr 9, 2021 at 7:38 PM
  3. Doug Halsey attached a file to the thread Historical multihulls.

    I've come across two more photos of the trimaran discussed in post #1334 (near the bottom of p. 89 above). These were both slides taken...

    Gulfport_1959_0002b.jpg Gulfport_1959_0001c.jpg Apr 6, 2021 at 7:05 PM