Koa Balk

Crew Rating

Crew effect over their career (not scaled to a team): 58.06 league percentile among ISSA crews with 30+ races (uncertainty ±0.115 rating points, on a spread of about 0.04 between crews; 39 races with rated skippers).

Season	Team	Rating	Range	League percentile	Team percentile	On team	Races	Team page
Spring 2026	Mira Costa High School	1.22		70.63	56.25	4 of 8	35	Team page

How much better or worse boats do with this sailor crewing than their skipper's rating predicts. The rating is on the skipper scale: the team's skipper average plus the crew's difference from their teammates, multiplied by 18.7 so a team's crews spread out like its skippers. Crews on one team differ far less than skippers do, so the band is about as wide as the spread itself: use the rating to line crews up across teams, not as a ranking within a team. In the Range column the dot is the rating, the shaded band is where it plausibly sits (90% range) and the dashed line is the team's skipper average; a wide band means little evidence. League percentile ranks the rating among all rostered crews in that league and season; team percentile ranks it among the crews on the same team that season (the share of teammates it beats, counting ties as half). Both use the skipper-scale rating, so the league one also reflects how strong the team's skippers are.

Singlehanded & Keelboat Results

Finish is the sailor's boat against every boat in that regatta, ranked by total points (a singlehanded sailor is their own boat; a keelboat finish is the whole crew's). Points include penalty scores.

Regatta	Role	Div	Races	Avg
Fall 2026 Team page Season
2026 PCISA Keelboat Challenge Keelboat	Sailor	A	6	7.8
Spring 2026 Team page Season
2025-26 PCISA SoCal 5 Silver	Crew	A	15	6.5
2025-26 PCISA SoCal 4 Silver	Crew	A	20	7.1

Related Sailors

League	Name	School	Year
ISSA	Koa Balk	South Torrance High School	'30