They tend to weigh more, because there needs to be a mixer assembly to separate the pilot's pitch and yaw inputs and have about the same wetted area. To a first approximation, a V-tail needs to have a projected area on a horizontal plane the same as the horizontal stabilizer and a projected area on the vertical plane the same as the vertical stabilizer.Why do so few designs have V-tails? To my simple mind they look like they would weigh less and have 1/3 less wetted area.
The trouble is that it's the area that does the work of providing stability and control....and have 1/3 less wetted area.
"Less of it." I really like how davis handled it. He's got a simple, seemingly robust, mixer, and then the tails are held on through one weldment.After all the back and forth I've heard over the years, yeah, that's my impression as well. As Bob notes, there are some small construction advantages.