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Current Flight Simulator Series >> Flight School >> Density Altitude Tips... /yabb?num=1319792579 Message started by Fozzer on Oct 28th, 2011 at 5:02am |
Title: Density Altitude Tips... Post by Fozzer on Oct 28th, 2011 at 5:02am
For those times when you find that you are running out of runway length!...
...by then, its too late!... :o...! Calculating Density Altitude: http://www.flyingmag.com/technique/tip-week/calculating-density-altitude-pencil?cmpid=enews102711 Paul.... :)...! P.S I find this procedure vital to understand, when taking off, and flying my normally-aspirated (carburettor-engined) aircraft, (Cessna 150/152, Piper Cub, Microlights, Flexwings, etc), at high altitudes! Its where careful setting of the Mixture Control becomes essential! |
Title: Re: Density Altitude Tips... Post by Gregorio on Oct 28th, 2011 at 6:28am
Very cool. Not the simplest rule of thumb but also not complicated - some exercises in using it should suffice. :)
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Title: Re: Density Altitude Tips... Post by Fozzer on Oct 28th, 2011 at 7:01am
I am a terror for drilling extra holes in my instrument panels... :D...!
And two of the most useful gauges, I find, when flying at high altitudes in my piston-engined aircraft are: (1) Exhaust Temp + Cylinder Head Temp gauge. (2) Manifold Pressure gauge. And adjusting the controls for maximum power when required! Paul...with my trusty hole cutter, and some colour-coded wires... ;)...! |
Title: Re: Density Altitude Tips... Post by Brett_Henderson on Oct 28th, 2011 at 7:02am
High density altitutde.. the triple-edged sword.. 1) Less HP .. 2) Less lift .. 3) Less thrust .. :o
Quote:
Indeed.. in fact, at very high density altitude you might not even get the engine to fire, without significant leaning... and it's very easy to foul the plugs on a long taxi.. and that can skew your run-up, 'cause you're not quite sure if it's density altitude, or fouled plugs effecting RPMs :( If I'm taking off at high DA, as soon as the engine is running, I lean as though I'm cruising.. slowy until RPMs drop off, then slightly rich. Then at run-up (ASAP), adjust mixture for an RPM peak.. and at the begining of the takeoff roll; as important as maintaining center-line, is to adjust mixture again, for a power peak. |
Title: Re: Density Altitude Tips... Post by Jokerc152 on Jan 23rd, 2012 at 7:36am
Maybe just me but Prop control is of the same importance as mixture control or am I worng on that :S?
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Title: Re: Density Altitude Tips... Post by Brett_Henderson on Jan 23rd, 2012 at 8:16am Jokerc152 wrote on Jan 23rd, 2012 at 7:36am:
Yes, and no.. For takeoff, prop-control is a non-issue, as it its always set to highest RPM .. and you "can" complete an entire fligt without ever adjusting prop-RPM.. the only real harm is fuel economy, and engine wear.. whereas mixture settings are critical.. EDIT:.. this is of course for light GA.. |
Title: Re: Density Altitude Tips... Post by Fozzer on Jan 23rd, 2012 at 9:00am
I have fitted my little Cessna 150 Trainer out with all manner of instruments and controls, making it ideal for Flight Training, covering almost everything, including full radio navigation....>>>
My perfect little GA Trainer, keeping me up to date with all the correct techniques! Paul... :)...! ...no expense spared!... ;)...! |
Title: Re: Density Altitude Tips... Post by Jokerc152 on Jan 23rd, 2012 at 11:08am
Brett yeah cool dont know how much of a change it makes on aircraft such as the DC-3 C-46 and the Lockheed Electra which I fly most of the time though ??
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Title: Re: Density Altitude Tips... Post by Fozzer on Jan 23rd, 2012 at 11:14am Jokerc152 wrote on Jan 23rd, 2012 at 11:08am:
DC-3 Owners Manual...>>> http://pcmuseum.tripod.com/dc3/ Paul.... 8-)...! |
Title: Re: Density Altitude Tips... Post by Jokerc152 on Jan 23rd, 2012 at 11:55am
Aw nice one :)
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