Is it normal for a car with a 17HP .5L engine to have a top speed of 71mph
Yes! You don’t need much power to get to ~100km/h, but good luck overtaking anything but cyclists 
Because the faster you go, the more and more power you need to go even faster, if you want to reach, let’s say, 100 mph, you would need triple the power 
Just finished the 7HP .4L Model it managed 55mph with fine tuning gearing. The 17HP model managed 0-60mph in an astonishing 105sec.
I LOL’d
[quote=“WizzyThaMan”]
I LOL’d[/quote]
Yes we finally reached 60, oh never mind kids where here lol.