Thrust is the star stat of any foil assist, and it’s the one most riders underestimate. Here we explain what thrust does, how much you need based on your weight and discipline, and why the difference between 25 and 33 kg is felt right where it hurts most.
What thrust really gives you
Thrust is the force the motor pushes with, measured in kilograms. It has one function above all others: to get you on foil. Takeoff is the hardest and most energy-consuming moment in foiling, and thrust shortens it. More thrust means fewer failed takeoffs, less paddling, and a faster path from flat to flying.
It matters especially in three situations: when you weigh more, when conditions are weak, and when you’re tired at the end of a session. Those are the moments when a few extra kilos of thrust decide whether you get up or sink.
How much you need
As a general guide, lighter riders in good conditions can manage with less thrust, while heavier riders and marginal days demand more. The problem with buying the minimum is that you notice it on the worst days, not the best. A system with margin lifts you when a tighter one leaves you swimming.
That’s why it’s worth looking at maximum thrust. FoilBoost offers 33 kg. Foil Drive’s universal assist units provide 24.5 kg in the Plus and 25.5 kg in the Slim. That difference isn’t about top speed. It’s about how reliably you can get on foil depending on the rider and conditions.
Thrust isn’t the only stat
Thrust lifts you. Battery capacity keeps you flying. FoilBoost combines its 33 kg thrust with 400 Wh in a single pack, more than the standard Foil Drive assist batteries. Together, they let you catch more waves and sail more marginal days without having to change batteries.
An honest note: a bigger battery weighs more and cannot be flown on a plane. If you travel with your gear, it’s something to consider.
Who benefits most from more thrust
Heavier riders, those who ride smaller foils, downwinders chasing bumps, and anyone who hates a failed takeoff. If you are light, ride a large foil, and only sail in clean conditions, you have more room to make concessions. The rest notice the extra margin.