The operative word is demo. You show how a squirt boat performs, and then let the customers try it themselves.
Real wind is better than wind tunnels.
It's not a vacation, it's a field test. Perhaps most impressive, he's never spent more than three weeks at a time in his Berkeley, California, office. He filled notebooks with trenchant commentary about setup time, ice-encrusted stakes, and the deleterious effects of UV rays on titanium dioxide tent fabric. In short, he's a truant on a salary. And, no, you can't have it.