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#15
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Backforce increases sharply as speed build up. The heavier a/c is, the more ability of retaining high speed which is above a/c's maximum level speed. In P51-zeke's test, they just did a shallow dive and then zoomed up. The zoom's beginning speed must be lower than 325PMH IAS. At first, they zoomed up from cruising speed,that was 210MPH IAS=250MPH TAS, when P51d reach 130MPH=150MPH TAS, zeke was 90m lower. So how much kinetic energy was spent to get altitude? 0.5(250^2-150^2)= 20000 If they begin from 325MPH IAS=389MPH TAS 0.5(389^2-150^2)= 64410 We assume that there is a linear relationship between "kinetic energy" and P51D's zoom advantge to "damaged" zeke52. So this time, p51d should be 3.22*90=290metres higher. That is to say, when p51d @325MPH IAS@10000ft, and find a (lightly damaged) zeke on his 6 with same altitude and speed. And the distant between them are 450 metres. P51D may try a zoom, and will probably (450+290)=740m higher than zeke when p51d's speed drops to130 MPH IAS. Surely 740m is enough for avioding being hit by zeke's cannon. Forthermore, let's assume zeke could bear 450 IAS@10000ft, if they zoom from 450MPH IAS=539MPH TAS 0.5(539^2-150^2)= 134010=6.7 times of so called small "90m",that is 603 metres higher. Surprising?Somebody will say zeke was underpowered and lightly damaged, I admit it, however, our caculating basis is on medium-low speed data, merely 210MPH to 130MPH IAS, it seems that p51d's zoom advantage will be more remarkable in high speed zooming, given by same amount of kinetic energy consumed. Perhaps, p51d will gain sth.300meters advantage over 109 by starting a high speed (450MPH IAS)zoom, who knows? You can not simply deny that possibility. Last edited by BlackBerry; 04-29-2012 at 03:00 PM. |
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