Comments on: Triangle of Velocities http://www.stevenhale.co.uk/main and Rotorcraft Thu, 12 Jan 2012 20:15:01 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Flight Planning « Programming Praxis http://www.stevenhale.co.uk/main/rotorcraft/triangleofvelocities/#comment-29 Flight Planning « Programming Praxis Tue, 19 Jan 2010 09:05:39 +0000 http://www.stevenhale.co.uk/main/?page_id=177#comment-29 [...] solution uses the law of sines, which states that the ratio of the length of a side to the sine of the [...] [...] solution uses the law of sines, which states that the ratio of the length of a side to the sine of the [...]

]]> By: Steve http://www.stevenhale.co.uk/main/rotorcraft/triangleofvelocities/#comment-28 Steve Thu, 17 Sep 2009 10:04:17 +0000 http://www.stevenhale.co.uk/main/?page_id=177#comment-28 Thanks for your comments John. Good to know it helped someone! :-) Thanks for your comments John. Good to know it helped someone! :-)

]]> By: Dr John Medhurst http://www.stevenhale.co.uk/main/rotorcraft/triangleofvelocities/#comment-27 Dr John Medhurst Tue, 15 Sep 2009 18:39:10 +0000 http://www.stevenhale.co.uk/main/?page_id=177#comment-27 Thank you for this. I tried to work it out from first principles and being an engineer, started with cartesian co-ordinate geometry which leads to some tricky simultaneous equations. Then I realised that Euclidean geometry was the answer but got in a muddle again by trying to use the cosine formula. I hadn't used the sine formula since school (> 40 years) and had forgotten it ! A happy rediscovery. One thing I would add to your excellent monograph and that is to remind your readers that they must convert wind angles from "from" to "to" for consistency with the Heading and Track vectors - then everything falls into place. Since you mention spreadhseets, it might also be worth warning that they work in radians (or at least the ubiquitous Excel does). A further picky point, you don't define Wd and Ws although it's pretty obvious to anyone who has thought about the problem. Best wishes, John Medhurst Thank you for this. I tried to work it out from first principles and being an engineer, started with cartesian co-ordinate geometry which leads to some tricky simultaneous equations. Then I realised that Euclidean geometry was the answer but got in a muddle again by trying to use the cosine formula. I hadn’t used the sine formula since school (> 40 years) and had forgotten it ! A happy rediscovery.

One thing I would add to your excellent monograph and that is to remind your readers that they must convert wind angles from “from” to “to” for consistency with the Heading and Track vectors – then everything falls into place. Since you mention spreadhseets, it might also be worth warning that they work in radians (or at least the ubiquitous Excel does). A further picky point, you don’t define Wd and Ws although it’s pretty obvious to anyone who has thought about the problem.

Best wishes,

John Medhurst

]]> By: A Windy Problem – Steven Hale Photography http://www.stevenhale.co.uk/main/rotorcraft/triangleofvelocities/#comment-26 A Windy Problem – Steven Hale Photography Mon, 17 Nov 2008 19:34:37 +0000 http://www.stevenhale.co.uk/main/?page_id=177#comment-26 [...] and subsequent ground speed to my spreadsheet I first had to derive the solution to the Triangle of Velocities. I thought a page showing the solution here might be useful to the next person trying to solve the [...] [...] and subsequent ground speed to my spreadsheet I first had to derive the solution to the Triangle of Velocities. I thought a page showing the solution here might be useful to the next person trying to solve the [...]

]]>