As far as other parts of the unit and sub-assemblies are concerned, there are no particular precautions to take, as long as the unit is properly maintained, and it is stored in good conditions. The Adventure tandem paramotor is available for foot-launching. Yes, for the simple reason of safety. The slowest take-off speed is around 40 kph. This is dependent on the air mass in which you are flying.
Ground speed is obviously dependent on the current wind-speed.
Contrary to popular perception, a more powerful paramotor does not fly faster, but will climb out quicker. Whichever engine you use, you will have the same horizontal speed. To the maximum height at which the motor will function, that is to say several thousand meters. When the climb rate is nil, with the engine just allowing you to maintain level flight, you have reached your maximum height. It is worth knowing that a paramotor has already passed over Mont Blanc at 5,100 meters - at the moment the officially recognized height record is 3,050 meters, many Adventure factory pilots have ascended to 3 or 4,000 meters.