The only reason that you might need 2 people to put up a mast is the second person would put the pin in the forestay. This goes for both F17, F16 etc. The weight is not an issue with regards to needing 1 person or 2. I sometimes use my spin halyard and run it around the bridle and back to the tramp. Then when I get the mast up I can tie or cleat the halyard tight and then walk around and put the pin in.