I think it is perfectly safe. I am a glider pilot and the glider I fly weighs 650 pounds (Blanik L-13), and we routinely fly it with 2 people weighing at least 180 pounds each without any problem. The maxinum gross weight for 2 people in this glider is over 400 pounds. The overall maxinum weight is 1100 pounds.
It may take a longer rollout on take off to get off the ground, but that is normal in any small plane, whether its a glider or power plane. It can actually be beneficial in gliders to hold the extra weight since it will improve your glide ratio by allowing you to flying faster without a decrease in performance, when compared to having less weight in the glider. Contest pilots in their single seat sailplanes will actually load their glider up with 300 pounds of water when the lift is strong and they want to fly cross country.
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I think it is perfectly safe. I am a glider pilot and the glider I fly weighs 650 pounds (Blanik L-13), and we routinely fly it with 2 people weighing at least 180 pounds each without any problem. The maxinum gross weight for 2 people in this glider is over 400 pounds. The overall maxinum weight is 1100 pounds.
It may take a longer rollout on take off to get off the ground, but that is normal in any small plane, whether its a glider or power plane. It can actually be beneficial in gliders to hold the extra weight since it will improve your glide ratio by allowing you to flying faster without a decrease in performance, when compared to having less weight in the glider. Contest pilots in their single seat sailplanes will actually load their glider up with 300 pounds of water when the lift is strong and they want to fly cross country.