As LM has said, wind does not affect endurance......it just makes you crash in a different place.
Before answering your question it would be best confirm what exactly you are asking.
For example, if you are asking about powered flight and a weight increase has been caused by extra fuel, then both the range and endurance will increase. But if the weight increase was caused by extra payload then both the range and endurance will decrease.
If however we are talking about gliding flight, then changes in weight will not affect best glide range, but will affect best glide speed and best glide endurance.
So are you asking about powered flight or gliding flight and are you asking about the speeds for best range and best endurance or are you asking about the best range and best endurance?
Last edited by keith williams; 16th January 2013 at 12:29.