#### flanker

##### ACCESS: Top Secret

- Joined
- Mar 20, 2008

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http://gizmodo.com/5511236/the-thrill-of-flying-the-sr+71-blackbird?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+gizmodo%2Ffull+%28Gizmodo%29&utm_content=Google+Reader

Here is the quote from one of my posts, calculating the mach number etc:

"

I Googled "mach 1" and one of the hits was "340.29 m/s". Multiply by 3,600 to get meters/hour, then divide by 1,000 to get km/hr. I didn't delve into it but I assume a standard day at mean sea level. I don't know what computations are involved in determining mach at altitude.

I have googled a bit (because i am interested in this), and found this, read mach92's reply:

http://answers.yahoo.com/question/index?qi...06100930AARLlWb

So at 80 000 feet the mach number should be around:

573.8 x 1.852 = 1062.7 km/h

573.8 x 1.151 = 660.4 miles/h

Even tho i messed up the second with miles, my calculations seems to be still right (please, correct me if i got it wrong, i tripple checked but it might still be wrong), 2250 miles per hour, or 3620 km/h.

To convert 3620 km/h into mach number you just need to use this simple equitation. 3620/1062.7=3.407 So the mach number around that time seems to be 3,41. And to quote:

The plane was flying a mile every 1.6 seconds, well above our Mach 3.2 limit.It was the fastest we would ever fly.

So that kinda contradicts with the mach number given later, 3,5. It is true he says that SR-71 continues to rise in speed, but we dont know how much, maybe just extra 05 mach, or maybe extra 20 mach.

To come back to the original statement of 3.68 that turns out to be 3,910 km/h, or 2429.56 miles per hour. I still hard time beliving mach 3.68 to be honest, but i will ask on a forum with a lot of knowledge.

Interesting discussion. :cheers:"

So, i wanted to hear several things:

1 - Are my calculations wrong?

2 - Could anyone confirm if mach 3.68 number was written in that book? Just to double check.