Power and engines in Paratrikes

The power output of paratrike engines can vary considerably: from 25-30 hp for lightweight single-seaters to 50 hp and more. However, the power-to-weight ratio considered a reasonable minimum is 1 hp per 7 kg of weight, while the reasonable maximum is 1 hp per 5 kg of weight. For example, if a trike has a combined weight of 200 kg, an engine producing between 30 and 40 hp would be powerful enough to keep it comfortably airborne. Naturally, 40 hp would be the best option. Ultimately, the most important factor is the thrust generated by the propeller, which is directly related to the engine's power output. For propellers and engines used in light aircraft, the static thrust-to-power ratio ranges from 2.5 to 2.9. Starting with a 30 hp engine, the expected thrust is 75-87 kg and depends primarily on the propeller diameter. In the case of paratrikes, static thrust is a key factor for a good launch, as it's what allows the paraglider to get going smoothly and take off easily. As we all know (sometimes quite literally) the hard way, with paratrikes, takeoff is critical. It's the moment when most equipment failures and breakdowns seem to occur. Power matters, but you should know that installing a  An excessively powerful engine on a paratrike can be extremely dangerous in certain situations or in combination with certain large two-seater paragliding wings.

In short, it's advisable to thoroughly research the matter before choosing an engine. You should consider aspects such as the availability of spare parts, fuel efficiency, the required power output, the possibility of performing maintenance at home, whether it's a modified engine, and so on.