A bug: Sometimes, the run starts very slowly, and the speed of the ship the speed reduced to a quarter of normal. I think that losing multipliers and then dying causes the problem. Quitting to the menu solves it.
For the hard medal, I used cruise missile, full fuel, level 3 ramp length and height, The Plank Mark II and H.I.G.H Tech. I also maxed the ramp angle, do it if you can. Go up with the cruise missile, and then start gliding, maintaining a speed around 230.