Yesterday a Cessna full of skydivers crashed shortly after takeoff. It appears that it had engine failure. Having flown 182's for skydiving, it is important to have the jumpers move as far forward as possible for takeoff. If they don't and you have engine failure, the plane will pitch up because of an aft CG, causing a stall spin. With the engine running, the aft CG is not an issue. A sad and avoidable disaster.