Which is an interesting statement. Herman can be reached on Gamesquad, Subsim, the comp.sys.ibm.pc.games.war-historical newsgroup, even privately via e-mail - why should you lean to "someone to relay thing to Herman"? If you have something to say to him, just do that.
But I like to be
Herman Hum free.
So do Matrix. It's their site. I like it. That's why I post here.
I'm pretty sure he didn't get banned for anything he PUBLICLY posted - rather, for a private communication.
I'm not following you, here: PDb is based on some earlier DBs - all recognized in the credits and all used after getting permission from the original complilers. This for the part regarding "plagiarism". Regarding "other people's radar, sonar and visual models" - how can they clash? Exp. they do clash with... what? Where the "other people's" models clashing with something, too? If so, with what? What is, in your opinion, "flawed" in PDb that should be corrected?
Exactly.
OK. Here are what are in my belief the official signature rules; they may not be, there's no mention of sig rules within the 3.9 documentation. I've left out sonar because then this post will be REALLY mind bending;-
Aircraft Signatures
Fixed-Wing
visual (front/rear): 100*log10(span * height/5)
visual (side): 100*log10(length[fuselage]*height[fuselage]/2)
infra-red: visual(aspect) - 200 + 00/10/30 Turboprop/Subsonic Jets + 10/20/50 Supersonic Jets
radar: visual(front) - 30
Helicopters
visual (front/rear): 100*log10(height[fuselage]*width[fuselage]2)
visual (side): 100*log10(height[fuselage]*width[fuselage]/2)
infra-red: visual(aspect) - 100 + 00/15/15 IR suppressor equipped + 00/30/30 others
radar: visual(front) - 30
Missile Signatures
visual (front/rear): 100*log10(diameter[fuselage]2)
visual (side): 100*log10(length[fuselage]*span[fuselage]/2)
infra-red: visual (aspect) - 100 + 10/20/50 subsonic + 20/40/90 supersonic
radar: visual (front) - 30
Ship Signatures
visual (front/rear): 100*log10(beam*height)
visual(side): 100*log10(length*height/2)
infra-red: visual(front) - 100 + 00//00/00 nuclear + 00/30/30 other
radar: visual(front) - 30
Submarine Signatures
visual(front/rear): 100*log10(beam*height/2)
visual(side): 100*log10(length*height/4)
infra-red: visual(front) - 100 + 00/00/00 nuclear + 00/30/30 other
radar: visual(front) - 30
So, if you know the height, fuselage, and wingspan (plus IR suppressor info) of any aircraft, missile, ship or sub, it's possible to calculate a set of signature values.
Herman hasn't bothered. There are literally hundreds of examples in PDB where the signatures don't match the dimensions. Sometimes the above are used; sometimes, Herman appears to have pulled a value at random out of a hat.
Here are 10 examples of the hundreds on offer;-
CC-130J
Hercules II AUS TRAN
Visual 150 166 150
Thermal -3 9 14
Radar 179 192 171
Length 40.4 metres, span 41.4 metres.
CASA C-295M VE 07 TRAN
Visual 156 186 156
Thermal -30 11 0
Radar 120 153 120
Length 21.4 metres, span 25.6 metres
C-5C Galaxy USA TRAN
Visual 215 247 215
Thermal 15 30 45
Radar 185 217 185
Length 30.5 metres, span 28.4 metres
The Hercules has a smaller radar signature from the front as from the back.
The Casa is smaller than the Hercules, but has a higher Visual signature, and a much lower thermal signature from the front as from the back.
The C-5 Galaxy is smaller than a Hercules (!), but has a much higher visual signature.
You think that's strange? Let's try a couple of transport helicopters;-
CH-47SD Chinook SGP TRAN
Visual 136 184 136
Thermal -64 -34 -34
Radar 106 154 106
Length 25.4 metres, span 15.2 metres
CH-53D Super Stallion USMC TRAN
Visual 159 177 159
Thermal 59 62 62
Radar 129 129 129
Length 22.4 metres, span 27 metres
The Chinook is bigger than a Super Stallion, but has lower signatures.
The Super Stallion has the same thermal signature from the side as the rear. Even stranger, the same radar signature from the side as from the front or rear. The world's first cubic helicopter.
Weapons signatures are similarly inconsistent;-
114mm/45 Twin Mk6 DP
Visual -198 -117 -198
Thermal -168 -87 -168
Radar -198 -117 -198
114mm/45 Vickers Mk 5 DP
Visual 0 0 0
Thermal 0 0 0
Radar 0 0 0
Ah, but it doesn't MATTER for guns. They can't be intercepted. Well, it does and it doesn't... it depends if you have recon aircraft that can spot thermal signatures of the gun firing, like E8 Jstars or Cobra Ball. It also depends if AGSI gives the "Platform XX is firing: Method offboard other" message an off button.
How about missiles then? They're pretty important, and can be hit by other missiles now on 3.9. Let's compare
RIM-66 C SM2MR Block I and Block II.
RIM-66C SM2MR Block I
Visual 77 124 107
Thermal -98 4 -18
Radar 0 66 -4
RIM-66C SM2MR Block II
Visual -8 81 22
Thermal -183 -39 -103
Radar -68 32 -72
So, the Block I has a front visual signature 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 times greater than the Block II model. (Logarithimic, exponential; 1 is ten times the size of a 0; 2 is 100 times the size of 0; 3 is 1000 times the size of 0; etc)
And just for curiousity's sake, compare them to AGM-78D (an air launched ARM version of the same weapon);
Visual -76 37 -76
Thermal -136 -126 -86
Radar -76 7 -106
All completely different. You'd think they were different sizes and shapes.
I've saved the best till last... according to PDB, nukes are invisible and you wouldn't even notice one going off if you were stood right next to it.
2000kg [N] 500kT [PRC]
Visual -32000 -32000 -32000
Thermal -32000 -32000 -32000
Radar -32000 -32000 -32000
Are these values inversely exponential (smaller the bigger?).
If they are... plane signatures are even MORE screwed up than previously thought. The C-5C is smaller than a Hercules or a Casa, and airliners are smaller than fighter planes.
This is why I won't use PDB. The signatures are vital for sensor modelling and PDB is inconsistent.
Of course, Herman could work through them all and give the people that like PDB a better DB.