Fast Planes
I race some of the fastest prop planes available, and speeds very rarely exceed 200 mph. In most cases, an extremely fast Q40 (look at my avatar picture) doesn't exceed 190 mph.
Most quickees with Nelson .40s will turn a 8.8" x 9 prop at over 19,000 on the ground. Do the math for me, but I've seen many on the radar gun in the mid to upper 160's mph.
This is much faster than most people imagine. Unless the claimers have seen a Q40 or Q500 race, I don't think that many truely understand the perception of speed.
I had a Whiplash with Jett .50, and although I didn't get to fly it much, it was very close to Q40 speeds. I wish I could have trimmed it out a bit better, to get a feel for the speed.