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Re: The Square-Cube law........

By: faul in ALEA | Recommend this post (0)
Tue, 24 Jun 14 12:33 PM | 31 view(s)
Boardmark this board | The Trust Matrix 		Msg. 15734 of 54959
(This msg. is a reply to 15733 by Cactus Flower)
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OK lets use the FAA data supplied in those PDF's..

Boeing 777....0.50M at sea level,0.86M at 35,000 ft
Boeing 747....0.55M at sea level,0.92M at 35,000 ft

Boeing 777...0.50 of 0.86=72%
Boeing 747...0.55 of 0.92=67%

Boeing 777...0.50 x 761mph=380.50mph Max Mach MMO
Boeing 747...0.55 x 761mph=418.55mph Max Mach MMO

Boeing 777...Max calibrated airspeed 380mph at SL
Boeing 747...Max calibrated airspeed 419mph at SL

Do you agree with the maths or is it curious?


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The above is a reply to the following message:
Re: The Square-Cube law........
By: Cactus Flower in ALEA
Tue, 24 Jun 14 4:13 AM 		Msg. 15733 of 54959

Sounds like you are trying to ignore your 0.53 mach number calculation and have replaced it with 350mph.

0.53 mach at sea level is 407mph.

Do you agree that your original calculation was off?

What does that tell you about the quality of your theory?

I'm not trying to prove your theory based on what you deem an impossible speed. You are.

I'll leave you to do your own figures. So far they have appeared unreliable (a 1.2 mach calculation and now a 0.53 mach calculation).

And anyway, I am not certain there's a linear relationship between thrust and velocity.

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