seikdel Posted February 16, 2012 Posted February 16, 2012 I'm not a real life flier, but I've had the opportunity to talk to several medevac chopper pilots. My understanding is that if you introduce fuel too early during startup, you can get a fireball that is generally pretty not-good for the engine. Some newer choppers have an automatic starter thing that ensures this doesn't happen. Am I off-base with this? Are "hot starts" possible in the Ka-50? Are they modeled?
Jona33 Posted February 16, 2012 Posted February 16, 2012 I'm not a real life flier, but I've had the opportunity to talk to several medevac chopper pilots. My understanding is that if you introduce fuel too early during startup, you can get a fireball that is generally pretty not-good for the engine. Some newer choppers have an automatic starter thing that ensures this doesn't happen. Am I off-base with this? Are "hot starts" possible in the Ka-50? Are they modeled? I think you might be able to in RL as the manual certainly says wait until RPM is 20% until moving the cut off lever but not sure in game. I've never set an engine on fire doing this but I wait now, back in BS1 I don't think it was possible. It might be now. Always remember. I don't have a clue what I'm doing
AlphaOneSix Posted February 16, 2012 Posted February 16, 2012 (edited) I am not sure if hot starts are modeled. Due to the design of the engine (or specifically, its fuel control), it's not possible to have a hot start unless there is a mechanical problem with the engine's fuel control. Okay there is an exception to that...if an engine start was attempted, and fuel was introduced into the engine, but the engine didn't start, and you attempt a restart without first performing a dry motor of the engine, you could get a hot start from pooled fuel in the combustion chamber. Other than that, the fuel control of the engine is in charge of timing and metering fuel flow to the engine at all times. You do not have to wait until 20% Ngg (N1) to open the fuel cutoff valves. For example, on the Mi-8/17 (same engines), the procedure is to press the start button, and then immediately open the fuel cutoff valve. Where I work, we have added a requirement that the N1 needle has at least jumped off the peg before opening the fuel cutoff valve, but we certainly do not wait until 20%. EDIT: I should add that for this particular model of engine, opening the fuel cutoff valves does not introduce fuel into the engine (or at least not into the combustion chamber), it merely allows the fuel control to do so at a time (and in the amount) of its choosing. Edited February 16, 2012 by AlphaOneSix
seikdel Posted February 16, 2012 Author Posted February 16, 2012 Okay, so in the Ka-50, the engine is in control of the fuel control system? One more question: I've noticed that levers for the cutoff valves have a relatively long travel (as opposed to, say, all the switches in the cockpit). Does this slowly open a valve as you move the lever? Or is that long lever travel there just to prevent accidentaly flipping it on/off? When I boot up the sim next, I'll try doing a false start and see if I can set my engine on fire that way...
AlphaOneSix Posted February 17, 2012 Posted February 17, 2012 Okay, so in the Ka-50, the engine is in control of the fuel control system? One more question: I've noticed that levers for the cutoff valves have a relatively long travel (as opposed to, say, all the switches in the cockpit). Does this slowly open a valve as you move the lever? Or is that long lever travel there just to prevent accidentaly flipping it on/off? When I boot up the sim next, I'll try doing a false start and see if I can set my engine on fire that way... Each engine has a fuel control unit that handles the automatic metering of the fuel flow to the engine. The aircraft has a fuel system that delivers fuel to the engine, but once the fuel gets to the engine, it's the fuel control that determines how the fuel is actually introduced into the combustion chamber. In the below picture, the item circled in yellow is the fuel control. The small red circle is the lever for the fuel cutoff valve, which is attached to a fuel cutoff valve lever in the cockpit.
AlphaOneSix Posted February 17, 2012 Posted February 17, 2012 (edited) Here is a picture of the inside of the fuel cutoff valve within the fuel control. The fuel comes in through passage "e" and is either routed to a spill line (when the valve is closed) or to the fuel nozzles in the combustion chamber (when the valve is open). You can get an idea of the size by comparing the size of the lever in this picture to the one circled in red in the picture in my previous post. They are fairly small and the travel is not very big either. Edited February 17, 2012 by AlphaOneSix
chardly38 Posted February 21, 2012 Posted February 21, 2012 Where im from some one would put a seat and tires on that engine. Or in the lawn mower.. [sIGPIC][/sIGPIC] =&arrFilter_pf[gameversion]=&arrFilter_pf[filelang]=&arrFilter_pf[aircraft]=&arrFilter_CREATED_USER_NAME=chardly38&set_filter=Filter&set_filter=Y"]MY SKINS And Helios i7 2600k 3.4 quad w/ Hyper N520 cpu fan_, Asus Sabertooth z77_, RX 580_, Corsair Vengeance 1800 8Gb ram_, 112 OCZ Vertex 3_, Corsair HX 1000, 3 screens res 5292x1050_,and 1 1680x1050 Helios Ir Tracker 5 with Pro Clip_,Hotas Warthog#12167 ...
ShuRugal Posted February 21, 2012 Posted February 21, 2012 on that cutaway there, the shaft with connects to the driven end of the turbine through the bevel gears, is that a PTO for the generator, or the means by which the turbine is started?
mvsgas Posted February 21, 2012 Posted February 21, 2012 Hot starts would be cool. This engine was good after this by the way. I love GE engines To whom it may concern, I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that. Thank you for you patience. Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true..
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