And they're often more in the know about their trajectories, technological aspects, performances, rates of acceleration.
Mach 25-30 isn't impressive itself...The space shuttle goes Mach 25 (~17,000 mph)...What is interesting is the incredible acceleration manuevers some of these 'craft'/objects pull off. If they are intellingently controlled then they *must* have some kind of directional acceleration control...aka "gravity" control...(ugghhh) I hate that phrase...(sooo...back to directed acceleration field... for me)...sounds so nice and scientific doesn't it?
Anyways if they can use something in their propulsion system/powerplant to get a directional acceleration field then
all is well and hunkydory for doing 30-100 g's acceleration!!! cuz then they can compensate without getting crushed ...unless they are invertabrea creatures?
Directional acceleration is not a new concept...Andrei Sakharov ...the Soviet equivalent of Dr. Vannevar Bush. The Soviet father of their H-bomb was investigating directional acceleration fields in the 1970's. Heck he came up with the tokamac design...His work isn't that far off from what others like Tesla, or Jean-Petit have proposed...
The Soviets censored and removed him from his National Academy of Sciences job when he went on the record publicly talking about UFO's and magnetic and gravity research in the 1970's and 1980's.
http://en.wikipedia.org/wiki/Andrei_Sakharov
ET's probably use something similar to this...
The truth is out there people...you just have to go and do a little digging for it...
