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I think that your in the right ball park with your answer.<br />
<br />
Using this calculator &nbsp;<a href="http://wahiduddin.net/calc/calc_da_rh.htm" rel="ugc">http://wahiduddin.net/calc/calc_da_rh.htm</a> I get 3400ft<br />
<br />
You dont give a figure for dew point or RH, so I used 0% RH
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I think that your in the right ball park with your answer.

Using this calculator  http://wahiduddin.net/calc/calc_da_rh.htm [http://wahiduddin.net/calc/calc_da_rh.htm] I get 3400ft

You dont give a figure for dew point or RH, so I used 0% RH

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Thanks for that. When I was thinking pressure altitude as you said I took the pressure of 1013 and not 1460.<br />
<br />
Thanks for the help.<br />
<br />
Cheers,<br />
<br />
Ross
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Thanks for that. When I was thinking pressure altitude as you said I took the pressure of 1013 and not 1460.

Thanks for the help.

Cheers,

Ross

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You're welcome. Happy Flying :)
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<div class="content wysiwyg-content">
I wanted to check my logic for the following question:<br />
<br />
&quot;You are contemplating a take-off at a high aerodrome(1460ft elevation) on a hot day(temperature 29 degrees Celsius). Approximately what is the current density altitude if the QNH is 1013mb?<br />
<br />
The answer is 3500?<br />
<br />
Density altitude= pressure altitude + (120x (OAT-ISA))<br />
<br />
So taking isa at sea level as 15 degrees Celsius and -2 for every 1000 feet then isa at say 1500 feet 12degrees Celsius.<br />
<br />
29-12= 17 x 120-&gt;2040<br />
<br />
2040 + 1013= 3053<br />
<br />
Am I just being to approximate with my answer or am I doing something wrong?<br />
<br />
Thanks for the help.<br />
<br />
Regards,<br />
<br />
Ross
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</div>


I wanted to check my logic for the following question:

"You are contemplating a take-off at a high aerodrome(1460ft elevation) on a hot day(temperature 29 degrees Celsius). Approximately what is the current density altitude if the QNH is 1013mb?

The answer is 3500?

Density altitude= pressure altitude + (120x (OAT-ISA))

So taking isa at sea level as 15 degrees Celsius and -2 for every 1000 feet then isa at say 1500 feet 12degrees Celsius.

29-12= 17 x 120->2040

2040 + 1013= 3053

Am I just being to approximate with my answer or am I doing something wrong?

Thanks for the help.

Regards,

Ross

Density altitude aviation

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