fixed [REPORTED]SA-10B (5V55R) Performance

nighthawk2174 · August 25, 2019

It's no secret missile performance in DCS is atrocious except for a very select few highlights (a few of the AIM-9 series). In particular the SAM's in the game are quite bad. I myself got around this problem by making my own missile mod. In the same vein as IASTAG I ran CFD on just about every missile in the game. Additionally I did extensive research looking for motor data and at best actual wind tunnel tests or flyout charts. I very recently though stumbled across flyout charts for the SA-10's 5V55R. I hope that this chart and my own work (tweaked with this new info) can at least convince ED to fix at least one SAM from the hilarity that is their performance right now.

Recently I came across:

or flyout charts for the SA-10 specifically the 5V55R the exact missile we have in DCS.

This is a graph of its performance in game vs real life, the shot was done at 10km (30,000ft) and so that is the line we are looking at performance wise on this chart.

The code to make the silver line match the graph is:

    {
       Name = SA5B55, --5V55, S-300P, SA-10B
	display_name = _('5V55R (S-300P)'),
	name = "SA5B55",
       Escort = 3,
       Head_Type = 6,
	sigma = {50, 50, 50},
       M = 1480.0,
       H_max = 30000.0,
       H_min = 25.0,
       Diam = 508.0,
       Cx_pil = 8,
       D_max = 65000.0,
       D_min = 1000.0,
       Head_Form = 1,
       Life_Time = 1080.0,
       Nr_max = 25,
       v_min = 150.0,
       v_mid = 1300.0,
       Mach_max = 5.0,
       t_b = 0.0,
       t_acc = 14.0, -- Corrected by https://youtu.be/7i-UMYNKwcU video
       t_marsh = 0.0,
       Range_max = 75000.0,
       H_min_t = 10.0,
       Fi_start = 3.14152,
       Fi_rak = 3.14152,
       Fi_excort = 2.0,
       Fi_search = 99.9,
       OmViz_max = 99.9,
       warhead = warheads["SA5B55"],
       exhaust = tail_solid,
       X_back = -3.681,
       Y_back = 0.0,
       Z_back = 0.0,
       Reflection = 0.178,
       KillDistance = 20.0,
	hoj = 1,
	loft =0,
	ccm_k0 = .2,		
	supersonic_A_coef_skew = 0.25, -- наклон прямой коэффициента отвала поляры на сверхзвуке
	nozzle_exit_area =	0.1358556, -- площадь выходного сечения сопла

	
	--[[PN_coeffs = {6, 				-- Number of Entries
				1000.0 ,1.0,		-- Less 5 km to target Pn = 1
				5000.0, 0.80,
				15000.0, 0.60,
				20000.0, 0.40,		-- Between 10 and 5 km  to target, Pn smoothly changes from 0.5 to 1.0. 
				25000.0, 0.30,
				30000.0, 0.10};		-- Above 30km target, Pn is 0.10.
	]]--causing issues
	
	ModelData = {   58 ,  -- model params count
					1.4 ,   -- characteristic square (характеристическая площадь)
					
					-- параметры зависимости Сx
					0.042 , -- Cx_k0 планка Сx0 на дозвуке ( M << 1)
					0.063 , -- Cx_k1 высота пика волнового кризиса
					0.02 , -- Cx_k2 крутизна фронта на подходе к волновому кризису
					0.035, -- Cx_k3 планка Cx0 на сверхзвуке ( M >> 1)
					1.0 , -- Cx_k4 крутизна спада за волновым кризисом 
					1.2 , -- коэффициент отвала поляры (пропорционально sqrt (M^2-1))
					
					-- параметры зависимости Cy
					2.5 , -- Cy_k0 планка Сy0 на дозвуке ( M << 1)
					1.5,   -- Cy_k1 планка Cy0 на сверхзвуке ( M >> 1)
					1.2  ,  -- Cy_k2 крутизна спада(фронта) за волновым кризисом  
					
					0.45 , -- 7 Alfa_max  максимальный балансировачный угол, радианы (.45 normally
						   --artificially limited)
					0.0 , -- угловая скорость создаваймая моментом газовых рулей
					
				-- Engine data. Time, fuel flow, thrust.	
				--	t_statr		t_b		t_boost		t_sustain		t_inertial		t_break		t_end			-- Stage
					-1.0,		-1.0,	0.01,  		11.0,			0.0,			0.0,		1.0e9,         -- time of stage, sec
					 0.0,		0.0,	0.0,		40.0,			0.0,			0.0,		0.0,           -- fuel flow rate in second, kg/sec(секундный расход массы топлива кг/сек)
					 0.0,		0.0,	0.0,		265000.0,		0.0,			0.0,		0.0,                -- thrust, newtons
				
					 100.0, -- Selfdestruction time in sec.
					 100.0, -- lifetime in seconds
					 0, -- Minimum height in M
					 1.0, -- время задержки включения управления (маневр отлета, безопасности), сек
					 25000, -- дальность до цели в момент пуска, при превышении которой ракета выполняется маневр "горка", м
					 100000, -- дальность до цели, при которой маневр "горка" завершается и ракета переходит на чистую пропорциональную навигацию (должен быть больше или равен предыдущему параметру), м 
					 0.0,  -- синус угла возвышения траектории набора горки
					 50.0, -- продольное ускорения взведения взрывателя
					 30.0,-- модуль скорости сообщаймый катапультным устройством, вышибным зарядом и тд
					 1.19, -- характристика системы САУ-РАКЕТА,  коэф фильтра второго порядка K0
					 1.0, -- характристика системы САУ-РАКЕТА,  коэф фильтра второго порядка K1
					 2.0, -- характристика системы САУ-РАКЕТА,  полоса пропускания контура управления
					 0.0,
					 0.0,
					 0.0,
					 0.0,
					 0.0,
					  -- DLZ. Данные для рассчета дальностей пуска (индикация на прицеле)
					 1.0, -- дальность ракурс   180(навстречу) град,  Н=10000м, V=900км/ч, м
					 1.0, -- дальность ракурс 0(в догон) град,  Н=10000м, V=900км/ч, м
					 1.0, -- дальность ракурс 	180(навстречу) град, Н=1000м, V=900км/ч, м
					 0.2, -- Уменьшение разрешенной дальности пуска при отклонении вектора скорости носителя от линии визирования цели.
					 1.0, -- Вертикальная плоскость. Наклон кривой разрешенной дальности пуска в нижнюю полусферу. Уменьшение дальности при стрельбе вниз.
					 1.4, -- Вертикальная плоскость. Наклон кривой разрешенной дальности пуска в верхнюю полусферу. Увеличение дальности при стрельбе вверх.
					-3.0, -- Вертикальная плоскость. Угол перегиба кривой разрешенной дальности, верхняя - нижняя полусфера.
					0.5, -- Изменение коэффициентов наклона кривой в верхнюю и нижнюю полусферы от высоты носителя.

				}, 
		proximity_fuze = {
							ignore_inp_armed	= 1,
							radius		= 12,
							arm_delay	= 1.6,
												},
	 
   },

- NOTE drag and lift coefficients come from CFD I ran on the missile.

and is placed in place of the current code in DCS/Scripts/DataBase/Weapons/Missiles_data.lua

Edited August 25, 2019 by nighthawk2174

BIGNEWY · August 30, 2019

Thanks

I have passed this to the team.

NineLine · August 31, 2019

...

Just for reference on bug reports, try to do so without using words like atrocious and hilarity, I know you feel strongly about these issues, and if your info is right it is indeed a bug, but to go on the offensive before getting an answer, might be why you havent got an answer yet.

Remember, constructive and mature is key.

BATCARLO · December 10, 2021

I am attaching a screenshot from TacView, where you can see the impossible 180 ° turns of the SA5B55, also made without loss of speed ...

Flappie · December 12, 2021

Did you catch this in a track?

If not, can you tell how to reproduce this?

BATCARLO · January 7, 2022

Take a look:

https://www.dropbox.com/s/i9hxfk7p887hqcq/SA5B55 180 degrees turn-00.mkv?dl=0

and another track

https://www.dropbox.com/s/twnv4visuzfawtp/SA5B55 180 degrees turn-01.mkv?dl=0

We play with "map only", so we can't track DCS reply...

Mad_Shell · January 11, 2022

Damn, 2.5 years later and still not fixed while Nighthawk did all the research and even shared his code. I hope this is corrected when ED releases the new Sa-10 model...

nighthawk2174 · April 9, 2022

Yeah and now nearly 3 years...

=36=Witcher · April 9, 2022

Wasn't this implemented in 2.7.11?

https://www.reddit.com/r/hoggit/comments/tzfv50/psa_the_sa10_missiles_have_been_updated_in_2711/

nighthawk2174 · April 9, 2022

Must of missed it in the patch notes then? I’ll take a look

Mad_Shell · April 9, 2022

14 minutes ago, nighthawk2174 said:

Must of missed it in the patch notes then? I’ll take a look

It's been updated in 2.7.11 but, like many changes, it's not in the changelog.

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fixed [REPORTED]SA-10B (5V55R) Performance

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