Power output for the gig race

We went back to see a second gig race. This time I noted that there seemed to be one stroke every 2 seconds on average having looked at several boats and timed multiple strokes. My estimate was that each boat might pull 4500N each stroke which would give a power of 4500/2 = 2250W which is roughly the power of a kettle. Perhaps this is a little high based on the idea that a professional cyclist might pull 400W with their legs.