I know when looking at Max Weight Capacities of kayaks, each company calculates it slightly differently. Do you calculate the ‘actual’ max weight capacity differently for different companies, and if so what do you do?
For instance, I’ve seen many people say “multiply the listed max capacity by .7(ish)” to get the actual/performance max cap. I’ve also seen many others say “multiply the listed by .7 and then subtract the weight of the kayak itself”. Are there some companies that you should or should not subtract the weight of the kayak itself? Are there some companies that are known to overestimate/underestimate their weights? Do you use different multipliers for different companies?
One example is the Old Town’s Castine 140, which lists a Max Capacity much higher than WIlderness System’s Tsunami 140 despite being narrower (and other than that they appear to have a very similar shape). Their ‘listed useable weight’ is a big more comparable though.
It’d be cool to make a chart of the “Performance Factors” to apply to each company’s listed max capacities.