If you weigh 137 pounds out of the shower, you will probably be
more like 157 at exit, counting the weight of your clothing, gear, and
protective equipment (you are wearing pads, right?).
A
wingloading of .75, at 157 pounds exit weight gives us a desired square
footage of (157/.75) = 210 sq ft. Since no one makes a 210, you're
probably looking at the canopies in the 220 range (Mojo 220 or Fox
225), since it's always better to err toward a larger, slower canopy.
With
that said, consider this. Most jumpers are moving toward larger, slower
canopies. When I started this sport, I did the above math and bought
myself a Fox 265. However, after a few jumps, I've decided to upsize,
and will probably buy canopies in the 280 range from here on out.
More and more jumpers are using canopies loaded around .65.
A wingloading of .65, at 157 pounds exit weight gives a canopy size of (157/.65) 241.5, or a Mojo 240 or Fox 245.
Be
aware that there are some other considerations with lower wingloading
(larger canopies). The larger canopy, while flying slower and landing
softer, will not fight the wind nearly as well, so beware (especially
on early jumps) of windy or turbulent conditions. I'd say that front
riser dive loops are a must for a larger canopy, to expand your
performance envelope for wind.
So, my recommendation to you would be to go with a 240, however a 220 might also be appropriate.
If
you want more input on this, try calling the manufacturers
(Consolidated Rigging (916) 652-8111, cr@crmojo.com; Basic Research
(909) 940-1324, br@inland.net). I'm sure they'd be happy to work with
you on selecting the correct canopy size for your weight, experience,
and expecting jumping conditions.