One important thing to realize with v-tails it that the moment arm (the distance between the rotating force and the axis it rots aroung) is long, which makes it work well for the yaw and pitch axes that you want from a vtail, since the moment is the distance from the vtail to the pitch and yaw axis, way up by the wing. The moment for the roll axis that you DONT want is only from the center of lift of the vtail to the roll axis, a few inches away, so doesnt have much leverage! There IS as much roll force as you would expect, but it doesnt get the leverage it needs to roll the plane, while the pitch and yaw you DO want get plenty of leverage, so win out over the roll. Or, at least thats how I've always understood vtails to work. --- Robert Scott <[EMAIL PROTECTED]> ps: vtail work best on planes with triangular fuses. 'I cannot think of a case in which apte could not be improved by replacing Robert Scott with little packets of condiments. -- Max Natzet' D100 - Robert Scott - Has a mail reader which puts his .sig ABOVE the quoted text. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
