HAWK21M
Topic Author
Posts: 30014
Joined: Fri Jan 05, 2001 10:05 pm

### Alpha Speed - Whats The History On The Name

Minimum speed Or Alpha.Where did this Name come from.Anything to do with Alpha,Beta,Gamma etc.
regds
MEL
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Buzz
Posts: 694
Joined: Sun Nov 21, 1999 11:44 pm

### RE: Alpha Speed - Whats The History On The Name

Hi Hawk, Buzz here. I probably don't have enough gray (or white) hair to be the authority on this. Maximum Alpha is the angle of attack the airplane stalls (in un-accelerated flight) and speed is loosely related to angle of attack.
g'day

SlamClick
Posts: 9576
Joined: Sun Nov 23, 2003 7:09 am

### RE: Alpha Speed - Whats The History On The Name

And I probably don't have enough gray matter but I'll add this: I think the Greek letter 'alpha' is used more or less uniformly by engineers to represent an angle, as 'delta' is used to represent amount of change, amount of difference and so forth. In this case 'alpha' of attack.

I'd welcome correction from my academic superiors.
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Starlionblue
Posts: 18084
Joined: Fri Feb 27, 2004 9:54 pm

### RE: Alpha Speed - Whats The History On The Name

 Quoting SlamClick (Reply 2):And I probably don't have enough gray matter but I'll add this: I think the Greek letter 'alpha' is used more or less uniformly by engineers to represent an angle, as 'delta' is used to represent amount of change, amount of difference and so forth. In this case 'alpha' of attac

Indeed. Taking it further, delta is rate of change (first differential, e.g. acceleration), gamma is rate of change of the change (second differential) and theta is rate of change of the change of the change (third differential). Delta, gamma and theta are used a lot by derivatives traders in risk calculate.
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