I'm getting into the home-stretch on the stability and control calculations on my project, and I suddenly find myself without a design standard for a certain flight mode.
My project is an unpowered sailplane, and has a conventional (for sailplanes) landing gear consisting of a single main wheel somewhat aft of the CG, with a skid forward and extending towards the nose. The initial phase of the (aero-tow) takeoff happens with both the skid and wheel in contact with the runway, and before liftoff the airplane rotates back onto the main wheel only, much as a tri-gear aircraft would do.
The FAA adopted JAR-22 as the certification standard for sailplanes back in 1993, and I've been using that document for various design criteria on my project. However, I can't find any reference in there for a rotation speed criteria. I know it's 0.8*Vs0 in powered airplanes, but is this an appropriate rotation speed for sailplanes, which generally takeoff and land well above Vs0?
My project is an unpowered sailplane, and has a conventional (for sailplanes) landing gear consisting of a single main wheel somewhat aft of the CG, with a skid forward and extending towards the nose. The initial phase of the (aero-tow) takeoff happens with both the skid and wheel in contact with the runway, and before liftoff the airplane rotates back onto the main wheel only, much as a tri-gear aircraft would do.
The FAA adopted JAR-22 as the certification standard for sailplanes back in 1993, and I've been using that document for various design criteria on my project. However, I can't find any reference in there for a rotation speed criteria. I know it's 0.8*Vs0 in powered airplanes, but is this an appropriate rotation speed for sailplanes, which generally takeoff and land well above Vs0?
