Thanks for that. From wikipedia, surface atmospheric pressure is less than 1% of that on Earth so you're probably right. A wind pressure from 500 kph wind at th

Thanks for that. From wikipedia, surface atmospheric pressure is less than 1% of that on Earth so you're probably right. A wind pressure from 500 kph wind at the surface of Mars would be roughly equivalent to wind pressure from a 50kph (Force 7) wind on Earth. It will be less still higher up in the atmosphere. (Assuming I didn't just get the physics embarrassingly wrong, please correct me if I did)