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Forum: Tech Log

9th Mar 2011, 00:52

Replies: 43

Somebody who know this?

Views: 12,925

Posted By Capn Bloggs

Here's John Lowry's chart showing the effect: ...

Here's John Lowry's chart showing the effect:

http://i521.photobucket.com/albums/w334/capnbloggs/Vx.gif

Forum: Tech Log

9th Mar 2011, 00:22

Replies: 43

Somebody who know this?

Views: 12,925

Posted By Capn Bloggs

For the original question, then, what is the...

For the original question, then, what is the practical application of this? Do light-aircraft pilot's handbooks have any guidance/charts (ala Figure 7.20 of Wizo's link), or is this all just theory?...

Forum: Tech Log

8th Mar 2011, 21:38

Replies: 43

Somebody who know this?

Views: 12,925

Posted By Capn Bloggs

typo

I stand corrected. I still don't understand why, but the graph in figure 7.20 of Wizo's link shows the effect. The effect of the headwind more than compensates for the decreased climb performance...

Forum: Tech Log

8th Mar 2011, 14:24

Replies: 43

Somebody who know this?

Views: 12,925

Posted By Capn Bloggs

IMO, the gradient will increase as the windspeed...

IMO, the gradient will increase as the windspeed increases until the windspeed reaches 142-ish m/s. At that point, you'd be going vertical (in the climb attitude, of course, with 142m/s showing on...

Forum: Tech Log

8th Mar 2011, 14:12

Replies: 43

Somebody who know this?

Views: 12,925

Posted By Capn Bloggs

Hazelnuts, Sorry, but no it doesn't. All that...

Hazelnuts,
Sorry, but no it doesn't. All that graph shows is that, as the thrust-to-weight ratio increases, the vertical speed increases (as we would expect), and that there is only one airspeed for...

Forum: Tech Log

8th Mar 2011, 12:35

Replies: 43

Somebody who know this?

Views: 12,925

Posted By Capn Bloggs

I have been thinking about this all day and still...

I have been thinking about this all day and still do not understand. If you change the airspeed axis to groundspeed (ie applying wind to the IAS), I agree you may be showing the achieved gradient but...

Forum: Tech Log

7th Mar 2011, 22:11

Replies: 43

Somebody who know this?

Views: 12,925

Posted By Capn Bloggs

Talk about confusing the poor guy. Vx is not an...

Talk about confusing the poor guy. Vx is not an angle, it's a speed. :cool:

Wiki:

So Vx remains constant regardless of wind. It is purely aerodynamic in nature, being the speed where excess...

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