09-04-2017, 06:35 AM (This post was last modified: 09-04-2017 06:36 AM by Matt Agajanian.)
Post: #1
 Matt Agajanian Senior Member Posts: 542 Joined: Dec 2013
Hi all.

I found this variation of our famous Mach Formula in the . From what I gather, Vc is aircraft speed (350 from the HP manuals formula). But what is the name of the variable is the Delta variable in the 1/Delta portion of this picture?

Thanks

Mach formula
09-04-2017, 09:42 AM (This post was last modified: 09-04-2017 09:42 AM by Maximilian Hohmann.)
Post: #2
 Maximilian Hohmann Senior Member Posts: 902 Joined: Dec 2013
RE: Varible clarification please
Hello,

Rho is the density of the gas. All the fancy factors in this equation are valid for specific units of speed and density only. Without supplying these, the equation is not really useful I'm afraid.

Regards
Max
09-04-2017, 10:23 AM (This post was last modified: 09-04-2017 11:12 AM by SlideRule.)
Post: #3
 SlideRule Senior Member Posts: 1,313 Joined: Dec 2013
RE: Varible clarification please
(09-04-2017 06:35 AM)Matt Agajanian Wrote:  ... what is the name of the variable is the Delta variable in the 1/Delta portion of this picture?

Matt

A partial explanation is available at Flight Instruments under the heading The Math (about ¹⁄₄ page scroll down). This doesn't exactly answer your question but it's a start. Hope it helps.

BEST!
SlideRule

ps: keep scrolling, there is additional math(clarification/explanation) further down.
09-04-2017, 06:59 PM (This post was last modified: 09-04-2017 07:00 PM by Matt Agajanian.)
Post: #4
 Matt Agajanian Senior Member Posts: 542 Joined: Dec 2013
RE: Varible clarification please
That seems to help. See, the way I figure it, after spending so much time with the formula we know & love, although that formula is based on speed & altitude, this one is for a specific purpose as the one I found has a different purpose/application and bases its formula on different variables (even though most of that looks identical to the one in HP manuals). Right?
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