AS F-8 Vapor

richoday said:
Enclosed photo is AS F-8 on runway in idle with vapor coming over UHT. Is there a correction for this?
Click to expand...


What "light" effect is this - is this a vapour effect linked to exhaust? Or is it a over-the-wing, manouvering vapour effect? As in this:




My guess is the latter - and so without a link to a gauge, progamming to tell when to show - it'll show up all the time. This is the same for AB effects - when they're added in the lights section without the appropriate trigger information in the panel.cfg - you get AB effects on all the time. Having solved how to trigger it, you'll then have to move the "light" way forward, around where the wing's thickness is greatest. I should add, that in real life, since this effect is the result of condensation induced by the lowered pressure that is created under high acceleration and/or high AoA.

For what it's worth, it seems the documentation of these vapours is better for later-generation fighters, having double-delta/LERX (leading edge root extensions), such as the F-18, or highly swept wings such the F-14 or Tornado pictured here. I suspect the prevalence of this kind of vapour is less evident on wings that are more highly loaded, such as the simple swept wings of F-86, F-8s, etc - but my recollection of the engineering science on this could likely be incorrect.

My personal preference is to delete the wing-vapour effects from most aircraft that have this. I can think of very few where this is modelled somewhat realistically - often it is too dense / pronounced (again, for my liking). I like how FSX automatically models in wingtip vortices, and that's usually good enough for me. A couple of addons do this well (can't recall now, not at my FS PC) - but some of the higher-end fighter model addons might look good, where the effect is more diffuse, and not a dense grey cloud.

Hope that helps,

dl
 
delta_lima said:
What "light" effect is this - is this a vapour effect linked to exhaust? Or is it a over-the-wing, manouvering vapour effect? As in this:




My guess is the latter - and so without a link to a gauge, progamming to tell when to show - it'll show up all the time. This is the same for AB effects - when they're added in the lights section without the appropriate trigger information in the panel.cfg - you get AB effects on all the time. Having solved how to trigger it, you'll then have to move the "light" way forward, around where the wing's thickness is greatest. I should add, that in real life, since this effect is the result of condensation induced by the lowered pressure that is created under high acceleration and/or high AoA.

For what it's worth, it seems the documentation of these vapours is better for later-generation fighters, having double-delta/LERX (leading edge root extensions), such as the F-18, or highly swept wings such the F-14 or Tornado pictured here. I suspect the prevalence of this kind of vapour is less evident on wings that are more highly loaded, such as the simple swept wings of F-86, F-8s, etc - but my recollection of the engineering science on this could likely be incorrect.

My personal preference is to delete the wing-vapour effects from most aircraft that have this. I can think of very few where this is modelled somewhat realistically - often it is too dense / pronounced (again, for my liking). I like how FSX automatically models in wingtip vortices, and that's usually good enough for me. A couple of addons do this well (can't recall now, not at my FS PC) - but some of the higher-end fighter model addons might look good, where the effect is more diffuse, and not a dense grey cloud.

Hope that helps,

dl
Click to expand...

I think you're correct on this. I have "//" another line in the Lights section and that seem to of squashed the issued I was having with the vapor streaming over the UHT section while at idle.

[lights]
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landing
light.0 = 4, 23.00, 0.00, 2.00, fx_vclight
light.1 = 6, -15.00, 0.00, 0.10, fx_ALPHA_CF105_exh
light.2 = 9, -15.00, 0.00, 0.10, fx_Alpha_CF105_AB
//light.3 = 7, -15.00, 0.00, 0.10, fx_ALPHA_CF105_Vapour <<<< I commented this one out and no case of the vapors :icon_lol:
//light.4 = 7, -11.46, 17.55, 1.33, fx_ALPHA_CF105_Vapour
 
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