>Recently I picked up a Spirit 2M kit, >I would like to change to a V tail >and need help as to area and the angle of the V. >Should I maintain the same surface area or what, >any suggestions..? If you have a given conventional tail, the area and dihedral angle of the equivalent V-tail can be estimated as follows: A_vtail = A_vertical + A_horizontal angle = arctan[ sqrt( A_vertical / A_horizontal ) ] Note: A_vtail is the area of both halves together. These formulas are strictly correct only for large tail aspect ratios, since they do not account for the local interference and lift cancellation at the V-tail roots during yaw or "rudder" application. But they are better than guessing. The DJ Aerotech site has a slightly different formula for the angle, but the results are similar in practice. - Mark Drela RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
