Wrench Posted September 7, 2020 Posted September 7, 2020 somebody refresh my (failing) memory ... the amount of fuel in the tanks is measured in kg, or liters, or ??? Got 5 fuel tanks to correct.... thanks!!! Quote
Spinners Posted September 7, 2020 Posted September 7, 2020 I think its kg but for fuel it's virtually the same as litres (a litre of water is 1kg). 1 Quote
+Gepard Posted September 7, 2020 Posted September 7, 2020 fuel in kilogram 1 litre AvGas=0.72 kg 1 litre JP-4 jet fuel = 0.82 kg Quote
+russouk2004 Posted September 7, 2020 Posted September 7, 2020 Yeah KG as cockpit gauges read KG burned \ used Quote
Wrench Posted September 7, 2020 Author Posted September 7, 2020 you'd think that after all these years, i'd know (ie: remember) this stuff .... i think the heat here is frying my brain (set a new record high temp here in LA yesterday -- 121 F!!! 1 Quote
Wilches Posted September 7, 2020 Posted September 7, 2020 2 hours ago, Gepard said: fuel in kilogram 1 litre AvGas=0.72 kg 1 litre JP-4 jet fuel = 0.82 kg That's why in aviation the fuel is measured in kilos not in litres. Quote
+streakeagle Posted September 8, 2020 Posted September 8, 2020 The problem is that fuel tanks have capacities determined by volume: gallons or liters, while aircraft performance depends on weight. So, you really need to know both the size of the tanks in terms of volume and the type of fuel to know its associated density. What I don't know is how an aircraft's display/indicator for fuel works when it displays weight. It wouldn't make sense for it to be using a float to determine tank level. It would make sense to have a flow meter that is calibrated for mass flow, but that requires assuming the density of the fuel and in my experience in industrial controls, flow meters aren't particularly accurate with errors of 2 to 5% being common no matter what the manufacturer's brochure claims. 1 Quote
+Crusader Posted September 8, 2020 Posted September 8, 2020 We have two values int he data for external (drop) tanks: Mass= - the total weight of the tank itself and the fuel content MaxFuelAmount= - the fuel content in kg There are still many droptanks around which have a Mass value less than the MaxFuelAmount - thats an error. If the weight of the empty tank is not known, then a rule of thumb is to assume 10% of the fuel content for the weight of the empty tank. 1 Quote
Wrench Posted September 8, 2020 Author Posted September 8, 2020 well, these are all internals gallons, moving aft 377 189 223 and two 44 gal wing tanks doing the online conversion thingy ... this is what I got Quote // Fuel Tanks --------------------------------------------------------- /fwd// [FuselageFuelCell1] SystemType=FUEL_TANK FuelTankID=1 MaxFuelAmount=1427.0 SelfHealing=TRUE FireSuppression=TRUE MinExtentPosition=-0.3865,0.9416,0.9672 MaxExtentPosition= 0.3255,-2.3569,-0.3843 HasArmor=TRUE ArmorMaterial=STEEL Armor[TOP].Thickness=5 Armor[BOTTOM].Thickness=5 Armor .Thickness=5 Armor .Thickness=5 Armor[FRONT].Thickness=5 Armor[REAR].Thickness=5 //center// [FuselageFuelCell2] SystemType=FUEL_TANK FuelTankID=2 MaxFuelAmount=715.0 SelfHealing=TRUE FireSuppression=TRUE MinExtentPosition=-1.3287,0.7112,-0.0235 MaxExtentPosition= -4.9720,-0.3566,0.2693 HasArmor=TRUE ArmorMaterial=STEEL Armor[TOP].Thickness=5 Armor[BOTTOM].Thickness=5 Armor .Thickness=5 Armor .Thickness=5 Armor[FRONT].Thickness=5 Armor[REAR].Thickness=5 /aft// [FuselageFuelCell3] SystemType=FUEL_TANK FuelTankID=3 MaxFuelAmount=844 SelfHealing=TRUE FireSuppression=TRUE MinExtentPosition= 1.4980,0.6275,-0.0910 MaxExtentPosition= 5.1414,-0.2938,0.2242 HasArmor=TRUE ArmorMaterial=STEEL Armor[TOP].Thickness=5 Armor[BOTTOM].Thickness=5 Armor .Thickness=5 Armor .Thickness=5 Armor[FRONT].Thickness=5 Armor[REAR].Thickness=5 [LeftWingFuelCell] SystemType=FUEL_TANK FuelTankID=4 MaxFuelAmount=166.0 SelfHealing=TRUE FireSuppression=TRUE MinExtentPosition=-0.70,-1.03,-0.68 MaxExtentPosition=-1.95,-0.20,-0.40 HasArmor=TRUE ArmorMaterial=STEEL Armor[REAR].Thickness=2 Armor .Thickness=2 Armor .Thickness=2 Armor[TOP].Thickness=2 Armor[BOTTOM].Thickness=2 [RightWingFuelCell] SystemType=FUEL_TANK FuelTankID=5 MaxFuelAmount=166.0 SelfHealing=TRUE FireSuppression=TRUE MinExtentPosition= 0.70,-1.03,-0.68 MaxExtentPosition= 1.95,-0.20,-0.40 HasArmor=TRUE ArmorMaterial=STEEL Armor[Front].Thickness=2 Armor[REAR].Thickness=2 Armor .Thickness=2 Armor .Thickness=2 Armor[TOP].Thickness=2 Armor[BOTTOM].Thickness=2 and to Streakeagle -- this particular 1948 era bird actually did use floats in each tank (have the pilots manual) Quote
+russouk2004 Posted September 8, 2020 Posted September 8, 2020 Windows 10 calculator does same.... Quote
Wrench Posted September 8, 2020 Author Posted September 8, 2020 excepting that i'm still on Winge7 2 Quote
+Menrva Posted September 8, 2020 Posted September 8, 2020 (edited) 1 hour ago, Wrench said: excepting that i'm still on Winge7 You might find the following links useful. myE6B Fuel Conversion: https://mye6b.com/Fuel/ Jet Fuel from Gallons to Pounds Calculator: https://jscalc.io/embed/oyHJrYooUr1wDQPb Moreover, if you know a specific fuel type used by a given aircraft, and use the density mean value, you can obtain much more accurate values in-game. For instance, for the yet to be released Raptor add-on, I was able to reproduce all internal fuel tanks properly, and together with external ones, a proper 26,000 lb (slightly more) are shown by the digital counter in the cockpit. For instance, the Raptor uses JP-8, and the density mean value of JP-8 should be around 0.8075 kg/L (https://www.repsol.com/en/products-and-services/aviation/jp-8/index.cshtml). Edited September 8, 2020 by Menrva Quote
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