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IL-2 Sturmovik The famous combat flight simulator. |
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Thread Tools | Display Modes |
#11
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Trim can vary by weight, but much more significantly by CG and speed. For best speed you want to be loaded at the aft limit because the stabilizer produces less downforce* at that loading than at the forward limit (the stab always produces downforce in a normally loaded conventional aircraft). Some aircraft can behave oddly concerning trim, for example the 190 which has a single trim setting (based on a given CG) for all speeds above 260mph. Some aircraft nose up sharply when flaps are lowered - some don't. That would be a function of the stabilizer size and distance from the wing and the type of flaps. This, of course, affects trim changes during flap operation. IL2 handles aircraft trim alright in a generic sort of way but my feeling flying the different aircraft is they all seem to be variations of a single flight model. I'm sure that's rather unavoidable. Rather than scoping in on the intricacies of trim I would go after much bigger fish by, first and way-up-front-and-foremost, coming up with a halfway realistic stall. The current IL2 stall makes the plane feel like the CG jumps toward the tail about eight feet during stall making spins universally almost inevitable and difficult (if not impossible) to recover from, regardless of real world performance.
*lift and downforce are drag and the more downforce a stab applies, due to the CG moving forward, the more drag it has and the more weight the wing has to carry - more lift - more drag. A typical figure for stab downforce carried by the wing is 10%. (This is why canards are more efficient - no downforce.) |
#12
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This is true for the immediate reaction of plane (more common in high wing design). Fact remains that you must re-trim – PRESTO – nose down and maintain a steeper glide. |
#13
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For me it is a very interesting subject because I am in the process of designing my own stick with force feed back .
I successfully ,so far, am receiving the X and Y componant from IL2 .(I did not check if it is proportional to air speed or to the square of it) (I for now , as a test ,am ONLY modulating the intensity of an LED (PWM) with this signal) It is now left to me the enjoying work to drive the Stick. I can do it anyway that would be the closest to reality As it is some 35 years that I have n' t used a real stick I have forgotten what it is like and am open to any suggestion..... It would be interesting to get the designing team of BOB to answer this question I have asked if BOB will handle FFB like IL2 but have RX no answer so far I must be swamped by the COLOUR of the EXHAUST gas FLAMES actual topic Looking forward to a continued interest in THIS topic g b Last edited by greypeace; 12-24-2010 at 05:37 AM. |
#14
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#15
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ha - my first response got caught in the quote ...
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#16
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Returning on topic, trim is presently simulated with moderate realism, and this is perfectly understandable and acceptable. Any attempt to simulate it with force feedback should try to simulate stick force variation with trim changes. It's no easy task, and I sincerely wish good look to anyone attempting it! Last edited by Furio; 12-24-2010 at 10:27 AM. |
#17
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I'm looking at building another stick from scratch and the thought I had on trim was to have a means of rotating the pot or hall sensor body so that the center point could be moved in game so setting trim via the hardware rather than software. This may give a more realistic solution? But obviously no good if you are using a bought stick unless you can modify it in some way although I think at least one stick, not sure which one, has trim wheels but again don't know if they control trim via hardware or software.
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#18
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moved from wrong place
-------------------------------------------------------------------------------- For me it is a very interesting subject because I am in the process of designing my own stick with force feed back . I successfully ,so far, am receiving the X and Y componant from IL2 .(I did not check if it is proportional to air speed or to the square of it) (I for now , as a test ,am ONLY modulating the intensity of an LED (PWM) with this signal) It is now left to me the enjoying work to drive the Stick. I can do it anyway that would be the closest to reality As it is some 35 years that I have n' t used a real stick I have forgotten what it is like and am open to any suggestion..... It would be interesting to get the designing team of BOB to answer this question I have asked if BOB will handle FFB like IL2 but have RX no answer so far I must be swamped by the COLOUR of the EXHAUST gas FLAMES actual topic Looking forward to a continued interest in THIS topic g b |
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