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Post by connieguy on Jun 17, 2020 7:04:46 GMT -5
I have recently been enjoying flying the Cal Classic C-97 with the vc textures and flight engineer's panel by Bruce Smythe. and have acquired real world manuals. These make it clear that the carburettors did have an auto-mixture device which adjusted the mixture according to the altitude, but also speak of the use of the usual manual fuel settings like Auto-Rich, Auto-Lean and Manual Lean. If I use the FSAviator cfg which has auto-mixture enabled the quadrant lever which I use to control the mixture has no effect whatever, as one might expect. If I disable automixture in the cfg it does have an effect but as the aircraft climbs the mixture has to be leaned to maintain power and if it is returned to Rich at altitude the engines simply cut in just the same way they would if the lever had been pulled fully back. The Jahn Constellatios, by contrast, will climb to Cruise level in Auto-Rich without issues and will even cruise in it if desired - as it is clear from the C-97 manuals that aircraft would too. Is this because other changes need to be made to the aircraft.cfg to get manual mixture to work, or is using manual mixture in the Cal Classic C-97 a lost cause, please?
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Post by Tom/CalClassic on Jun 17, 2020 9:15:08 GMT -5
I believe the auto rich (etc.) mixtures in the Connies are controlled by panel gauges; without those the C-97 will act as you say. I doubt if adapting those gauges to the Boeing would be a trivial task...
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Post by connieguy on Jun 17, 2020 9:43:19 GMT -5
OK Tom, that was rather what I had expected. Many thanks.
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Post by beeker46 on Jun 17, 2020 13:44:35 GMT -5
I have a possible solution for you... if you download the DC-4 from dc3airways.net/our_fleet/dc4_fleet_fsx.htm there is an automixture gauge for 4 engines on that aircraft that you should be able to copy over to the C-97, just click on the auto-rich/auto-lean button as needed and it will take care of things while you climb/cruise. I have used it on other 4-engine aircraft to great effect. The DC-3 on that same site has a 2-engine gauge that does the same thing, and works the same way...
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Post by Defender on Jun 17, 2020 14:59:53 GMT -5
Hi Ken,
Beeker's suggestion may work but let us know if you get the correct fuel flows? They may be fixed for each model.
My Connie experience has prompted me to try for real world performance on a number of models so I use manual leaning a lot. Yes with automixture off you have to keep leaning during the climb so if I'm lazy I set automixture for the take off and climb (pretty accurate) then go to settings and disable it for the cruise. The important thing is that you have to remember to set mixture to an approximate level for the altitude BEFORE you disable automixture or it goes very quiet! I admit it's more a fun thing than a big improvement. FSAviator's settings for automixture seem not surprisingly to be based roughly on the autolean setting at higher altitude so you can get a slight improvement with manual leaning. FS9 doesn't allow a high enough f/a level to give you the AR fuel flow.
With my modified Stratocruiser I can get the following,
20,000', max cruise 1,900 bhp 2,350 rpm, 147 BMEP,
For AL or manual leaning, mixture 17%/ 0.074 (gives correct 895 pph) For AR 21%/0.091 (gives 996 pph - FS9 limit, should be 1,150 pph )
Bill
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Post by connieguy on Jun 17, 2020 15:43:56 GMT -5
Thank you very much to you both. I like the Stratocruiser in its C-97 form. The exterior model may be old but it still cuts it in my opinion and of course the view from the cockpit is second to none. With Aaron Swindle's sound file it is a plausible experience and one feels the power of the engines. The trouble with real world manuals after the experience of the Constellations is that one wants all aircraft to behave like them when this is not possible, but I'm sure much of the FS Aviator version gets close to the real thing - the considerable time it takes for the aircraft to pick up any speed on take-off after pushing the throttles fully forward, for example. I will see what I can do with the DC-4 file.
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Post by Defender on Jun 17, 2020 17:26:34 GMT -5
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Post by connieguy on Jun 18, 2020 7:23:52 GMT -5
Thank you Bill, I had not seen that. There is material in common with the real world manuals, as one would expect, but it is still very interesting.
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