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#3347175 - 07/21/11 06:33 AM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") ***** [Re: Tiger27]  
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Originally Posted By: Tiger27
The Spit usually needs about 10 -12% throttle as well, it then takes some time to warm up, slowly throttle it up as the engine warms, or else you will stall it.


Tiger, is this something you think should be changed in the first posting? - Just asking, because I don't myself see a big difference from what I wrote there.


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#3463116 - 11/27/11 07:00 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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I'm getting the Hurricane started, warmed up and off the ground OK, it's after that that I keep blowing up the engine. What are some of the "no-nos" regarding engine management while flying? I already try to keep the temps from going too high and try to stay out of the high boost range with the throttle, but I'll still have the engine seize up nearly every flight.


Intel i5 2500K CPU @4.0,Gigabyte GA-Z97-HD3 MB (turbo) GTX 1060 6G, 16G DDR3, Windows 10 Home 64 bit- "N�or bhris focal maith fiacail riamh."
#3463146 - 11/27/11 07:49 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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If your temps (both oil and coolant) are OK then I can only think of the mixture as the factor making your engine seize up.


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#3463213 - 11/27/11 09:54 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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Should it be full rich most of the time? I've been leaning it out until I see the exhaust flame turn blue. How do I know when it's appropriate to lower the RPMs?

Last edited by Murph; 11/27/11 09:55 PM.

Intel i5 2500K CPU @4.0,Gigabyte GA-Z97-HD3 MB (turbo) GTX 1060 6G, 16G DDR3, Windows 10 Home 64 bit- "N�or bhris focal maith fiacail riamh."
#3463233 - 11/27/11 10:23 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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Ok, I'd need more experts fliers to chip in, but I think you should only start to lean it if you go really high, several kilometers. However, if you have the wrong mixture stetting the engine doesn't seize up immediately, it just starts to sputter badly and you can then save the situation by going full rich.

If you tell me that your engine seizes up irrevocably, then I'm thinking that you might have damaged it by taking off too early. Are you sure that you get both oil and coolant hot enough? I like to see them both edging up towards 80 or 90 degrees before I take up at radiator fully open. Only when I am in cruise and with coarse pitch do I start to take the radiator down from fully open.

Anyway, you should just know that it is indeed possible to fly the Hurri for as long as you want with no engine trouble. I basically never have trouble, even on more than half-hour long missions. I generally never have trouble with the engine, just leave it and forget it...


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#3463236 - 11/27/11 10:24 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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I do have a couple of Hurri missions up, among my movies, maybe you can see if I do anything dramatically diferrent from you?


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#3463279 - 11/27/11 11:42 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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Thanks for the tips, I did a brief test and found the engine seemed OK if I left her on full rich. How to you know when it's safe to lower the prop pitch (RPMs) using both the Rotol and DH props? Are there settings that should be avoided? So far I'm lowering the RPMs to about 2800- what's a good setting for cruise?
It's a good thing these are only virtual engines- I'd owe the crown a real pile of cash by now...


Intel i5 2500K CPU @4.0,Gigabyte GA-Z97-HD3 MB (turbo) GTX 1060 6G, 16G DDR3, Windows 10 Home 64 bit- "N�or bhris focal maith fiacail riamh."
#3463547 - 11/28/11 01:43 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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Murph, I think you should have a look at Flea's fantastic documents in the stickied thread at the top of this forum:

http://simhq.com/forum/ubbthreads.php/topics/3342810/UPDATE_7_OCT_2011_Aircraft_Ope.html#Post3342810


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#3464290 - 11/29/11 02:36 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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Thanks, I already have them downloaded and the pilot notes for the Hurricane are printed out and sitting right here next to me. I managed to blow up engines even with those.


Intel i5 2500K CPU @4.0,Gigabyte GA-Z97-HD3 MB (turbo) GTX 1060 6G, 16G DDR3, Windows 10 Home 64 bit- "N�or bhris focal maith fiacail riamh."
#3464329 - 11/29/11 03:45 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Murph]  
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How long is it before your engine gives up? If it is less than a minute after take off then it has to be your radiator. Did you know it is closed by default?


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#3466322 - 12/02/11 05:56 AM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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Murph Offline
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Thanks for the help, guys. I'm starting to get a better grip on using the Rotol prop. Now to start learning the DH5-20.


Intel i5 2500K CPU @4.0,Gigabyte GA-Z97-HD3 MB (turbo) GTX 1060 6G, 16G DDR3, Windows 10 Home 64 bit- "N�or bhris focal maith fiacail riamh."
#3467348 - 12/03/11 09:31 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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Keep RPM within the ranges suggested in flea's document and make sure your boost isn't too high. If you balance these with both the propeller and throttle you should be right.

If your spit is getting hot and you have some altitude it is a good idea to nose down gently to pick up speed and open radiator. A lot of people throttle back instead but the spit needs high airflow (speed) to cool down.


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#3467739 - 12/04/11 05:21 PM Re: Quick and dirty CEM guide for our American cousins (that is: "Complex Engine Management") [Re: Freycinet]  
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Murph Offline
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I understand that the DH5-20 is just a two-pitch prop but I haven't quite worked out how to use it properly. I do the normal start-up with the pitch set fine and wait for the temps to get into the right range, but when I throttle up for take off, she starts to run really rough. If I throttle back it smooths out but then I don't have enough thrust for takeoff.
So I'm not quite clear on proper procedures using the DH5-20.
Edit; After some testing, I find that although the real Hurricane only had two mixture settings, full rich and full lean (weak), since I have my mixture on a slider I can lean it just a little and it cures the rough running on take-off. I still need to keep the radiator open all the time or she overheats real fast, even at cruise settings.

Last edited by Murph; 12/04/11 06:27 PM.

Intel i5 2500K CPU @4.0,Gigabyte GA-Z97-HD3 MB (turbo) GTX 1060 6G, 16G DDR3, Windows 10 Home 64 bit- "N�or bhris focal maith fiacail riamh."
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