Need some explanations for parameters on F-15's VSD screen

[Majesco]

Hi guys, i need someone explain me the meaning of parameters on F-15C' Vertical Situation Display

 

 

I've known some of them, but are they right ??

 

_ 389: Target's current airspeed, 389 knots

_ 80: Radar scan range = 80nm

_ 8-0: Target current altitude, 8000 feet

_ G 430: My F-15's current ground speed, 430 knots

_ M17 Sec: Missile's Pre-launch timer, 17 seconds to active

 

But im not clear about these parameters:

 

_ H: Target aspect = Head-on ?? and T = Tail-on ??

_ 820: I know it's closure rate but don't know exactly what it's and its measurement unit

_ 17: ???

_ 283: Target Bearing

_ 103: Target Heading

But what's the difference between Target Bearing and Target Heading ?

 

Thx in advance !!

[GGTharos]

_ H: Target aspect = Head-on ?? and T = Tail-on ??

 

Correct

 

_ 820: I know it's closure rate but don't know exactly what it's and its measurement unit

 

Closure in KTS. The speed you and your target are closing at. It will change depending on aspect and speed.

 

_ 17: ???

 

Range in nm.

 

_ 283: Target Bearing

_ 103: Target Heading

But what's the difference between Target Bearing and Target Heading ?

 

Thx in advance !!

 

 

Target bearing is the heading you must turn to to be pure on the target. Target heading the direction in which the target is going, with respect to itself.

[RvEYoda]

_ 389: Target's current airspeed, 389 knots

 

True airspeed yes, not kcas (maybe thats what u meant). This is comparable

to your GSPD when you are flying horizontal. (his nose direction doesn't matter).

[flanker2730]

I UNDERSTAND

[Majesco]

thank you all

but im still not clear yet....

 

GGTharos:

_ 17nm at the bottom of VSD means current distance between my plane & the MiG-29G = 17 miles ?

and -7, -8.. ?

 

_ Closure rate 820 knots, could you explain more clearly ?

Is it the differential airspeed (or ground speed ?) between me and my target ?

 

_ Target Heading & Target bearing, what're their unit measurement or how to determine (based on a 360o circle) ??

 

And some more parameters in the pic below:

 

_ 3L, 2R..(above, beside Target heading) what're they ?

_ M0, M16 ??

_ 37, 12 (above, beside scan range) ?

 

ps: After Mx Sec = M0 at the bottom of VSD (Pre-launch timer = 0 sec), can i fire medium range missiles (AIM-120C) immediately ?

 

 

[GGTharos]

thank you all

but im still not clear yet....

 

GGTharos:

_ 17nm at the bottom of VSD means current distance between my plane & the MiG-29G = 17 miles ?

 

Correct

 

and -7, -8.. ?

 

If you mean the numbers above the target symbols in TWS, it's their altitude in 1000's of feet.

 

_ Closure rate 820 knots, could you explain more clearly ?

Is it the differential airspeed (or ground speed ?) between me and my target ?

 

Correct. If you were heading directly at each other with each aircraft having a true airspeed of 500kts, your closure would be 1000kts. If you were heading away from each other at the same speed, your closure would be -1000kts, and if one was chasing the other it would be 0kts.

 

_ Target Heading & Target bearing, what're their unit measurement or how to determine (based on a 360o circle) ??

 

Um ... degrees ;)

 

And some more parameters in the pic below:

 

_ 3L, 2R..(above, beside Target heading) what're they ?

 

They're aspect in 10's of degrees. So in the case of 3L, your bandit is heading 30 deg left off your own heading. Aspect works up to 180deg ... so an aspect of '18' means the target is head on with you. I think this might be a little bugged up in this game.

 

_ M0, M16 ??

_ 37, 12 (above, beside scan range) ?

 

Post/Next missile to-active timers, IIRC.

 

ps: After Mx Sec = M0 at the bottom of VSD (Pre-launch timer = 0 sec), can i fire medium range missiles (AIM-120C) immediately ?

 

You can fire before that. The timer is there to show you when the missile starts guiding on its own - thus allowing you to break contact with your bandit if necessary.

[GGTharos]

thank you all

but im still not clear yet....

 

GGTharos:

_ 17nm at the bottom of VSD means current distance between my plane & the MiG-29G = 17 miles ?

 

Correct

 

and -7, -8.. ?

 

If you mean the numbers above the target symbols in TWS, it's their altitude in 1000's of feet.

 

_ Closure rate 820 knots, could you explain more clearly ?

Is it the differential airspeed (or ground speed ?) between me and my target ?

 

Correct. If you were heading directly at each other with each aircraft having a true airspeed of 500kts, your closure would be 1000kts. If you were heading away from each other at the same speed, your closure would be -1000kts, and if one was chasing the other it would be 0kts.

 

_ Target Heading & Target bearing, what're their unit measurement or how to determine (based on a 360o circle) ??

 

Um ... degrees ;)

 

And some more parameters in the pic below:

 

_ 3L, 2R..(above, beside Target heading) what're they ?

 

They're aspect in 10's of degrees. So in the case of 3L, your bandit is heading 30 deg left off your own heading. Aspect works up to 180deg ... so an aspect of '18' means the target is head on with you. I think this might be a little bugged up in this game.

 

_ M0, M16 ??

_ 37, 12 (above, beside scan range) ?

 

Post/Next missile to-active timers, IIRC.

 

ps: After Mx Sec = M0 at the bottom of VSD (Pre-launch timer = 0 sec), can i fire medium range missiles (AIM-120C) immediately ?

 

You can fire before that. The timer is there to show you when the missile starts guiding on its own - thus allowing you to break contact with your bandit if necessary. In your second example the missile would take 16 seconds to reach active range, and take over the attack on its own.

Unfortunately you would be shooting outside of Rmax, so unless that bandit turned into your missile you would miss. :)

[Geier]

[Majesco]

-7, -8 If you mean the numbers above the target symbols in TWS, it's their altitude in 1000's of feet.

 

numbers above target symbols in TWS means their altitude, of course i know it

but -7, -8 here is number at the bottom, right corner as number 1-2 (i think it's not 1-2 maybe -12 is correct) on the Geier's picture, beside Target bearing position

 

/ maybe a little bugged up on showing Distance on F-15's VSD, not enough space to display numbers ???

 

i'll try to find out what numbers 12 & 37 are later, not sure they're TTI, thanks GGTharos

 

ps: sorry for bad Eng :D

[GGTharos]

Yes I think you're looking at a little display bug there :)

 

Those numbers are TTI, but they can be off if the target maneuvers.

[Majesco]

Yes I think you're looking at a little display bug there :)

 

so -7, -8 or -12... means 7, 8 or 12 miles - the distance between me and target when i were heading away from target ?

[GGTharos]

It's -just- the range. Why the - appears there, I don't know :D

[Vadifon]

There is the same azimuth/range and aspect target for F-16 и F-15(Lockon VSD) /see attach\

 

In real life is there a difference between в-scope F-16 and в-scope F-15?

[Majesco]

Thank you guys

and 1 more question....does anyone know Rtr, Rmin and Rpi mean ?

what're their abbreviation ?

[GGTharos]

Rtr - Range Turn and Run: The range at which an enemy can turn around at a given g load, accelerate at a given number of g's to a specific speed above the one he had before (like +300kt) and basically outrun your missile. IN general, if you shoot inside the Rtr your opponent will be unable to easily outmaneuver the missile

 

Rmin - Range Minimum: The minimum range. Inside this range the warhead might not arm, or the missile might be unable to physically turn to target in time

 

Rpi - I forget :D

[Ironhand]

Rpi - I forget

Range to Probable Intercept?: I could very well be wrong but...max range at which missile can reach target assuming it doesn't maneuver. That's the one range that hasn't been mentioned yet. Think of it as: if the pilothad a heart attack and his aircraft is on autopilot, the missile has just enough energy to reach him for the kill.

 

Rich

[Majesco]

Thank to all, i've already found simple definitions of Rtr/ Rpi/ Rmin in Lock On's manual :D

Now, need more helps....about these 2 scales: A and B at the picture below

 

1. The scale in box A only show when the aircraft flying at low altitude

What's the scale in box A ?

what do numbers (10, 20, 40) mean ?

 

2. about B: is the scale shows the height from sea level (or ground ??) to the aircraft ?

from which altitude will it show scale like that ?

how to know exactly my altitude in this situation ?

and what do numbers 1,2,3....mean (in foot or meter) ?

 

how's the relationship between A and B ?

 

 

 

 

[Vekkinho]

and what do numbers 1,2,3....mean (in foot or meter) ?

 

Can't say for sure, but F-15 should use Imperial units (feet, knots, lbs)!

 

See your setup UI, check for units U selected (imperial or metric)!

[Majesco]

i chose Metric

[Rhino4]

I think that the units you select (imperial/metric) only affects the ui and mission editor. I'm pretty sure that each individual aircraft will still display measurements depending on if it's an eastern or western aircraft. The german mig-29a is the only eastern aircraft that displays imperial units (I think). F-15 will still display knots/feet/lbs if you have "metric" selected as your unit of measurement for the game.

 

PS : It also affects labels and such in-game.

 

Edit: Got so obsessed with correcting vekkinho that I forgot to answer your question lol. A is your angle of attack scale. It is shown at lower speeds and is used for landing purposes. B is your altitude above the ground in feet in measurements of hundreds of feet and is shown when you are below 1000 feet. Ie: your scale shows about 90 feet above the ground. The little R at the bottom left of the scale tells you that your plane is using radar to measure the distance to the ground.

 

Check pages 74 and 75 of the manual for more info.

[mvsgas]

IIRC the Right side is Hundred of feet measured by radar altimeter. The lower you get the bigger the scale to be more specific in altitude. You can see a "R" at the bottom of the scale indicating it is measure by the radar altimeter. I not sure about scale "A" I think it is AOA or VVI but I'm not sure.

[LawnDart]

Thank to all, i've already found simple definitions of Rtr/ Rpi/ Rmin in Lock On's manual :D

Now, need more helps....about these 2 scales: A and B at the picture below

 

1. The scale in box A only show when the aircraft flying at low altitude

What's the scale in box A ?

what do numbers (10, 20, 40) mean ?

 

2. about B: is the scale shows the height from sea level (or ground ??) to the aircraft ?

from which altitude will it show scale like that ?

how to know exactly my altitude in this situation ?

and what do numbers 1,2,3....mean (in foot or meter) ?

 

how's the relationship between A and B ?

 

 

 

 

 

 

The "A"-side is your AoA tape or Angle of Attack, and it shows up when the landing gear is lowered. The "B"-side is your radar altimeter and it is inhibited above ~1,000 feet AGL (reverts to barometric/MSL altitude at that point), but anytime you're at an altitude of less than 1,000 feet it appears on your HUD.

 

The HUD symbology is in feet. In this case (pic above) your AoA is 5 degrees and your AGL (above terrain) altitude is approx 90' feet. The number 1 on the "B"-side represents 100', 2 - 200' etc...

 

There's a Flaming Cliffs .pdf manual in your "docs" folder under the main LockOn directory that explains all the HUD, RWR, radar symbology etc. :smilewink:

[Majesco]

thank you all for reply, i've read LOMAC Manual.pdf again and found what i need to know on page 74 (ILSN) :D

 

Check pages 74 and 75 of the manual for more info.

 

exact, thank u :D