Aernov Posted March 6, 2021 Share Posted March 6, 2021 Is MiG-21 supposed to start and run it's engine with fuel pump switches off? Real procedure requires (or advises?) at least feed tank pump on before engaging starter, with enabling two other pump switches soon after engine idle RPM stabilization and AC generator becoming operational, in DCS engine can start and operate with all pumps off. 1 Link to comment Share on other sites More sharing options...
Dr_Arrow Posted March 6, 2021 Share Posted March 6, 2021 Yes it is possible, I know even a story of a student performing one of his first solo flights with fuel pumps disengaged, where he wondered why the empty tanks lights were blinking during pattern flight in turns even though the fuel tanks were full. Only after landing he realized that fuel pumps were off when switching the engine off. It wasn't however Bis version, but the fuel system is nearly the same. 2 Link to comment Share on other sites More sharing options...
Aernov Posted March 7, 2021 Author Share Posted March 7, 2021 So, what is the purpose of these pumps? Just prevention of immediate shutdown at near-zero or negative Gs? 1 Link to comment Share on other sites More sharing options...
unknown Posted March 7, 2021 Share Posted March 7, 2021 16 hours ago, Aernov said: Is MiG-21 supposed to start and run it's engine with fuel pump switches off? I'm no Mig-21 expert, it's been a while since i read the manuals, but from what i remember the fuel pumps are "just" used to manage correct fuel flow from the tanks to the engine in situations gravity is not enough. From the Mig-21bis flight operations instruction, you turn on the fuel pumps after engine start: 4 Modules: KA-50, A-10C, FC3, UH-1H, MI-8MTV2, CA, MIG-21bis, FW-190D9, Bf-109K4, F-86F, MIG-15bis, M-2000C, SA342 Gazelle, AJS-37 Viggen, F/A-18C, F-14, C-101, FW-190A8, F-16C, F-5E, JF-17, SC, Mi-24P Hind, AH-64D Apache, Mirage F1, F-4E Phantom II System: Win 11 Pro 64bit, Ryzen 3800X, 32gb RAM DDR4-3200, PowerColor Radeon RX 6900XT Red Devil ,1 x Samsung SSD 970 EVO Plus 2TB NVMe, 2 x Samsung SSD 2TB + 1TB SATA, MFG Crosswind Rudder Pedals - VIRPIL T-50CM and VIRPIL MongoosT-50 Throttle - HP Reverg G2, using only the latest Open Beta, DCS settings Link to comment Share on other sites More sharing options...
Frederf Posted March 9, 2021 Share Posted March 9, 2021 Engine pulls fuel by mechanical pump. Switches are for electrical pumps. Officially I think supposed to run dispenser tank during start and add rest later. It might vary with without external power. In DCS battery power can run out but never an issue running all 3 anyway. 1 Link to comment Share on other sites More sharing options...
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