REFLECTOR: Density Altitude

Mike Dawson medawson250 at yahoo.com
Wed Jul 10 19:18:32 CDT 2013


Take a look at a KOCH chart. Just Google it. With the numbers you posted for your airplane I hope that 4000 ft density altitude airport has a long runway!

Michael E Dawson
ATCI CFII


On Jul 10, 2013, at 2:24 PM, "Ruben Creus" <ruben at vainneg.com> wrote:

> Hi there, 
> 
> I guess this has come up before, so sorry to ask again if it had
> 
> I was wondering if any one has similar experience or data. I have a Standard
> Velo Fix Gear, with a Catto fix pitch prop. With aprox. 700lbs between
> passengers and fuel, in the winter with density altitude of 500ft I need a
> bit more then 2,000 ft to rotate with a VS+ of maybe 500ft/min. 
> 
> But in the summer, on a hot day things are not pretty. My density altitude
> goes up to around 2,000 for the same field, and I need around 2,500 to
> rotate and my climb rate is maybe 200ft/mim. for the same weight.
> 
> I need to fly to a field that, at the time of take off I expect to encounter
> a density altitude of 4,000ft, with that same weight. So, I wonder if you
> have any experience in those altitudes with that weight and with a fix pitch
> prop. How much runway would that take and what rate of climb?
> 
> Ruben
> 
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