F l a n k e r Posted March 10, 2005 Posted March 10, 2005 Ok... as I said my English knowledge is not so good. So, sorry my incomprehension. I have learned a new word! I appreciate the competence of JJ, SwingKid and the others, but remember that any Joe Public can read an aeronautical manual. And you too (oh men, I'm british too!), finding out that the ramps function is, yes to "transform" the supersonic flow in subsonic, but also to control the mass flow. And this also before the supersonic flight. For Skywall, thanks, I don't have understood that brit=British!
Rampstrike Posted March 10, 2005 Author Posted March 10, 2005 Hey, Ruggbutt.... How did you get those pics? I took an Eagle up for a flight last night to see if the ramps would act like that, and they didn't. At idle, the ramps were almost straight, similar to your second picture. That's as closed as they got... any more thrust just changed them from "wide open" to "REALLY wide open." Those screenies were from 1.02, or 1.1? Did you make any sort of changes? Thanks, Rampstrike
Guest ruggbutt Posted March 10, 2005 Posted March 10, 2005 They're from the demo and "modding" it to add the rest of the planes. Alot of the code is already there, just the textures and such aren't. There's a thread here somewhere telling you how to do it.
F l a n k e r Posted March 10, 2005 Posted March 10, 2005 Hi Rampstrike, I have take a ride on the Eagle (1.02). I think that the position of the air intake depends from the speed, not only from the throttle. I have the same effects of ruggbutt.
britgliderpilot Posted March 10, 2005 Posted March 10, 2005 Hi Rampstrike, I have take a ride on the Eagle (1.02). I think that the position of the air intake depends from the speed, not only from the throttle. I have the same effects of ruggbutt. I have a sneaking feeling that in v1.02 the angle of the intakes on the Eagle is also affected by angle of attack . . . . worth checking. http://img.photobucket.com/albums/v121/britgliderpilot/BS2Britgliderpilot-1.jpg
Rampstrike Posted March 10, 2005 Author Posted March 10, 2005 Interesting... Although, something is still amiss. I've spent the last couple of days looking at pics of Eagles in flight, and it seems like most of the time, under what I would guess to be normal to low-end cruising speeds, the intake ramps are slightly down (much like ruggbutts 2nd picture). On takeoff and landing, including full AB takeoffs, the ramps appear to be fully down. The only time I see any pictures with the ramps fully open is when the plane is parked! Anyway, I guess I'd be happy if I just got the same results that you guys do, but for me, my ramps are stuck fully open, pretty much regardless of what the aircraft is doing...
F l a n k e r Posted March 10, 2005 Posted March 10, 2005 Perhaps I have found what we need to know about the Eagle intakes: The engines are fed by a pair of laterally-mounted straight, two dimensional external compression air intakes. The intakes are swept forward from bottom to top, in order to ensure that an adequate amount of air is admitted to the engines at high angles of attack. The intakes are pivoted at their lower edges and can be adjusted in flight to angles of as much as 4 degrees above or 11 degrees below the horizontal. The air intakes "nod" up or down under the control of an air data computer to keep the aperture facing directly into the airstream in order to maintain a smooth flow of air into the engines. The angle of the intakes can also be adjusted to prevent more air than necessary from being taken in to the engines. The intake surfaces have an additional function in providing extra maneuvering control, in a manner similar to the function of the canard foreplanes fitted to aircraft such as the SAAB JAS-39 Gripen. At supersonic speeds, the effectiveness of the "nodding" intakes is almost a third of that of the horizontal stabilators. The intakes stand away from the fuselage sides to prevent boundary layer air from entering the engines, making complex diffuser plates unnecessary. Downstream of the intake are moveable ramps which control the amount of air admitted to the engines. The exhausts of the F100 engine have fully-dilating nozzles to control the mass flow of air from the exhaust. The dihlating nozzles were initially fitted with "turkey-feather" vanes, but these were later removed on most aircraft. Usual informations, but the text report, like Brit says, that the intakes is also affected by angle of attack. And this is simulated! I have take this text from: http://www.csd.uwo.ca/%7Epettypi/elevon/baugher_us/f015.html#RTFToC20 by Joe Baugher What do you think about it?
Guest ruggbutt Posted March 10, 2005 Posted March 10, 2005 I've seen the intakes act differently because of airspeed and (it seems) altitude. I just took those quickly w/Fraps, hence the high AOA. I couldn't hold it steady, mess w/airspeed and hit the screenshot key for Fraps very easily.
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