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-   -   Rules Of Thumb (https://www.pprune.org/pacific-general-aviation-questions/175846-rules-thumb.html)

vneandbeyond 23rd May 2005 04:27

Rules Of Thumb
 
This thread is a chance for all the experienced pilots out there to share their wisdom.

Ie 6 degree lead for 90 degree turn to intercept VOR when doing 120kts, 10 precent of groundspeed to turn onto an arc etc etc.

Bring on the tips.

Mr.Buzzy 23rd May 2005 06:50

Gday all,
do a search of "Thumb rules" There has been a thread on this, from memory, some handy info was posted too.

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tinpis 23rd May 2005 06:54

Chook cooked in an oven bag is much nicer
Cook for one hour at 180C

EngineOut 23rd May 2005 08:27

try this website:

http://www.flightinfo.com/rulesofthumb.asp

mattyj 23rd May 2005 22:10

Isn't it 1% of ground speed joining the arc vne?

psycho joe 24th May 2005 01:48

CFIT.....don't do it....It's bad for the engines.

:ugh:

cjam 24th May 2005 03:08

When faced with a forced landing and there is no handy smoke to judge the wind direction.....look for some cows, they always face into wind.

NAMPS 24th May 2005 03:28

"It's much better to be down here wishing you were up there than up there wishing you were down here"

vneandbeyond 24th May 2005 04:25

Mattyj, 1 percent is correct - whoops!

Half your groundspeed as a decimal also works well ie Doing 140kts 140/2 = 70 which becomes 0.7 so begin turning onto a 10 mile arc at 10.7 DME. Gets less accurate with increased speed.

Cheers.

Onewordanswer 24th May 2005 05:10

Cow Met.
 
Using other clues to find the wind
Seagulls stand facing into the wind, and, supposedly, cows always point their behinds into the wind :rolleyes:Cows, when they are standing or resting, usually face away from the wind,especially if it is raining or snowing, to minimize getting their faces wet and cold. (When they graze, they prefer facing into the wind, as the breeze aims the tops of the grass towards them, although they often graze in a random pattern).

Night Watch 24th May 2005 06:09

If you stand perpendicular to the wind and take a piss..... every one foot of deflection = 10 knots of wind.

McRippy 24th May 2005 09:35

Once a month let the spare pilot fly your plane so you can blame him for any !!!! thats wrong with it

Jawz 24th May 2005 09:37

"rule of thumb" goes back to the turn of the 19th century when a husband was leagaly allowed to beat his own wife with a stick no greater in width, than his own thumb.

Go figure

Old Smokey 25th May 2005 11:01

When you're over the ocean at night and want to know the swell direction for a possible ditching, tilt the radar down until a 'banana shaped' fuzzy return is indicated. That 'banana' is approximately the orientation of the swell, as the face / back of the swell is the most radar reflective part of the swell.

Regards,

Old Smokey

shortandsmelly 25th May 2005 12:46

So whaddawedo if we don't have radar, then???:}

Runaway Gun 25th May 2005 19:56

But seriously, what orientation should your banana be bent towards?

cjam 25th May 2005 22:11

Night watch.....is your rule of thumb for wind speed gender specific or can all pilots use it?

Ultralights 26th May 2005 08:01

the amount of flap you should use is the same angle as the windsock. nill wind-full flap, blowing a gale-no flap, and all in between.

Stiff Under Carriage 26th May 2005 13:14

mattyj and vne,

Its not 10% nor 1%, however the example that you give using 140kts is correct, that makes it 0.5%.

Ie, With 140kt groundspeed 0.5% would be 0.7 DME, hence your lead distance for the arc. This works regardless of the angle of intercept. If your approaching the arc at an oblique angle your groundspeed will be less hence the lead in distance is less. Becareful the groundspeed has to be read off the DME not a GPS.

Hope this helps.


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