RE: Westbury Hunter Build Thread
After completing the fin and rudder, with the exception of the servo box, I moved on to the speedbrake. I thought it would be neat to have a working speedbrake, so after a bit of sketching out some ideas, I came up with this. A 2.5” stroke air ram from Todd at Dreamworks gives about a 45degree opening. The geometry when closed caused a little trouble, as the first attempt would not fully close. After measuring clearances beneath the jet pipe, I managed to get a good closing geometry, at the expense of a small reduction in the opening angle. The complete speeedbrake and ram is removable, except for the structural cradle in the fuselage. Two polyply screws hold on the hinge fairing and retain the hinge pin.