It was Sullivan's first time experiencing the pressure of powering the catamarans in race conditions and he said there was a step-up in intensity.
"It was definitely a bit more intense, everyone is really switched on and really locked into what we're doing. We didn't have the best of races, but we learnt a lot, which was really good and just to get out there and really cement that understanding of what you need to do and what the boat needs was really good," he said.
Sullivan isn't the only sailing novice aboard Team NZ. Former sprint cyclist Simon van Velthooven, who like Sullivan was one of New Zealand's medal winners at the London Games, is another cross-code recruit. With the Kiwi team installing a cycle-grinding system rather than the traditional handle-driven pedestals, van Velthooven was targeted for his cycling expertise.
"They've been in a lot of races in their time - just not so many yacht races," jokes Peter Burling.
Sullivan can find plenty of similarities between rowing and grinding.
"It's definitely very similar [to the intensity of a rowing final], but it's a bit more on-off. So there are patches where the boat demands a lot of power and you have to give as much as you have and then there are times where you can take it a bit easier, whereas with rowing it is consistently killing you," he said.
"When you're giving it a full effort it's very much the same as rowing."
For Sullivan the big difference is what goes on off the water.
Whereas the Olympic Games is as much about upholding the Olympic ideals of sportsmanship as it is the physical endeavour, the America's Cup is underpinned by grudges and simmering resentment between key players.
Sullivan admits the off-water niggle has been a bit of a shock to the system.
"Being in the build-up I've definitely learned what it's all about and it's definitely a different ballpark. In the Olympics everyone sticks to themselves and tries to get the best out of themselves, whereas with the America's Cup everyone is looking for that little slight tactical advantage over each other and they'll try and do anything to make it happen. In some ways it's quite fun, it adds to it all."