Best way to achieve 1.3 on downwind?

[Ski01]

I'm cheating and have an FFG on station on the port quarter at 1.3nm, makes an easy fly-over.

There was a method of setting up the HSI with downwind offset indicator - can anyone remind me please?

Other methods?

Yes - I'm flying g=10% of CIAS on crosswind with wind adjustment - but this isn't as accurate (for me) as I'd like.....

[Kang]

If you set the HSI scale down to 10 and the 'wingtip' of the ownship indicator touches the course line, you are fairly close.

[Frederf]

Should be canopy visual reference when wings level at height similar to bombing practice. You can set up TACAN to ship if she's hosting of course, tune and box the label on the display.

[lucky-hendrix]

When tacan is boxed and you selected a course in the bottom right corner of Hsi you have the abeam distance displayed ...

 

I do the 1% break, once I got 250 I lower gear and flaps and go to a 30deg bank. I adjust slightly based on Hsi display

 

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[Flamin_Squirrel]

I do the 1% break, once I got 250 I lower gear and flaps and go to a 30deg bank. I adjust slightly based on Hsi display

 

I do this too. Seems to work well.

[Ski01]

Hmmmm - with course set I'm not getting the abeam distance on the HSI. I did a while ago but not now....

[Tiger-II]

A rough rule-of-thumb is the negative 10 degree pitch line is your height in thousands of feet away, but miles.

 

For example, if you are at 2000 ft, the point under the negative 10 degree pitch line is 2 NM away.

 

2.0 NM = 2 x 6076 = 12,152 ft.

 

sin(10) * 12152 = ~2110 ft.

 

20 degrees is half the distance of 10 degrees (1.0 mile), 30 degrees is ~0.67 miles (1/3 the distance), 40 degrees is 1/4, and so on.

 

To get the distance from altitude (alt in feet; distance in NM):

 

(1 / sin(lookdown angle) * altitude) / 6076 = distance away in NM.

 

There are 6076 ft in 1 nautical mile.

 

Hope this helps!

[macedk]

A rough rule-of-thumb is the negative 10 degree pitch line is your height in thousands of feet away, but miles.

 

For example, if you are at 2000 ft, the point under the negative 10 degree pitch line is 2 NM away.

 

2.0 NM = 2 x 6076 = 12,152 ft.

 

sin(10) * 12152 = ~2110 ft.

 

20 degrees is half the distance of 10 degrees (1.0 mile), 30 degrees is ~0.67 miles (1/3 the distance), 40 degrees is 1/4, and so on.

 

To get the distance from altitude (alt in feet; distance in NM):

 

(1 / sin(lookdown angle) * altitude) / 6076 = distance away in NM.

 

There are 6076 ft in 1 nautical mile.

 

Hope this helps!

 

I just got schooled ;)

Nice :)

[Tiger-II]

Fly the turn from upwind to downwind at 160 kts using 30 degrees of bank, or 280 kts using 60 degrees of bank, in a level turn, will get you 1.3 NM.

 

http://www.flightlearnings.com/2009/08/26/radius-of-turn/

[Doum76]

A rough rule-of-thumb is the negative 10 degree pitch line is your height in thousands of feet away, but miles.

 

For example, if you are at 2000 ft, the point under the negative 10 degree pitch line is 2 NM away.

 

2.0 NM = 2 x 6076 = 12,152 ft.

 

sin(10) * 12152 = ~2110 ft.

 

20 degrees is half the distance of 10 degrees (1.0 mile), 30 degrees is ~0.67 miles (1/3 the distance), 40 degrees is 1/4, and so on.

 

To get the distance from altitude (alt in feet; distance in NM):

 

(1 / sin(lookdown angle) * altitude) / 6076 = distance away in NM.

 

There are 6076 ft in 1 nautical mile.

 

Hope this helps!

 

 

 

 

You make me jealous man, wish my brain was smarter as you are to understand and to fast use these as flying... i always knew drawing in math classes in highschool would gets me in trouble later. :) But hey, it leads me to graphic designer/digital artist... :) Seriously, i'm so laysy i let the Hornet's computer do all the maths and my eyes to gauge the distance, i simply use the HSI's Cross Track Error Indicator/Perpendicular offset and simply adjust my turn to make sure i'm 1.1-1.2 nm on downwind.

Edited December 22, 2018 by Doum76

[Ski01]

I'm often flying with lots of wind or weather.....

[Ski01]

found the cross track indicator again - forgot that it is only shown on lower display - doh

[vctpil]

A rough rule-of-thumb is the negative 10 degree pitch line is your height in thousands of feet away, but miles.

 

For example, if you are at 2000 ft, the point under the negative 10 degree pitch line is 2 NM away.

 

2.0 NM = 2 x 6076 = 12,152 ft.

 

sin(10) * 12152 = ~2110 ft.

 

20 degrees is half the distance of 10 degrees (1.0 mile), 30 degrees is ~0.67 miles (1/3 the distance), 40 degrees is 1/4, and so on.

 

To get the distance from altitude (alt in feet; distance in NM):

 

(1 / sin(lookdown angle) * altitude) / 6076 = distance away in NM.

 

There are 6076 ft in 1 nautical mile.

 

Hope this helps!

 

Sorry, maybe I missed something, but I don't understand how to use the pitch line to estimate the distance. Is it the distance from the runway in downwind position ?

 

Thanks,

Vincent

[Flamin_Squirrel]

While useful, I don't think that it applies to the OP's question.

[majapahit]

I try to do as close as 0.7nm (simply break hard) which gets you to the coffee quicker

[Tiger-II]

There are two sets of equations. Don't miss my second post.

 

As for computation - I just pre-calculate some values, then I can ball-park other values. With practise you just get a feel for what is required.

 

By looking at the 10/20 degree pitch line in the HUD, you can see where to look roughly when looking out the side of the canopy at the ground, to pick a spot on the ground to turn towards/fly over.

 

You don't really calculate anything - just know rough figures - as you're ultimately flying visually.

 

If you're flying instrument approaches, things are already defined for speed/turn rate/angles, so there isn't much in the way of "mental gymnastics".

 

A bit of practise, and you'll fly a circuit without even thinking about it. :)

[Ski01]

Nice visual method Tiger II - how would you use this technique when starting downwind so you can assess 1.3nm separation from the boat?

[Tiger-II]

Nice visual method Tiger II - how would you use this technique when starting downwind so you can assess 1.3nm separation from the boat?

 

You need to fly procedurally (use instruments) as you can't really pick a visual point easily.

 

The basics are as above - speed + roll angle gives turn radius. Once you've made the turn to downwind you can start to slow down and get configured. As I recall, it begins when abeam the aft end of the ship on the downwind leg. Use TACAN to find the 45 degree point to turn back in.

[Bankler]

found the cross track indicator again - forgot that it is only shown on lower display - doh

 

I think it’s visible in the right DDI as well, but not the left, for unknown reason.

[Flamin_Squirrel]

I think it’s visible in the right DDI as well, but not the left, for unknown reason.

 

Hidden by the area reserved for displaying cautions most likely.

[RogueSqdn]

Hidden by the area reserved for displaying cautions most likely.

 

 

 

 

Definitely true. I usually have the HSI on the right DDI when landing for that reason.