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#51
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Guy Alcala wrote in message .. . If I'm doing this correctly (brain's a bit fuzzy at the moment) taking the ratio of 12/19.7, multiplying it by (1,050-557) and adding 557, I get 857.3+ feet, close enough to the British value of 885 feet for government work. I wonder if the Brits and Germans were using the same standard atmosphere for their calcs? Guy I don't know-but it really doesn't matter since it is comparative test, and the 28ft difference is neglible-it is -factory- rating (add Your calculation error, RaE lack of maintenance procedures knowledge for control surfaces regulation, slight difference between aircraft and You got it) . One thing that RaE mispresented is the stated 1,200 hp power; Bf-109E3(export) with DB-601 cannot produce more than 1,100hp 5min power at 12,100ft (nominal power). The -ultimate- DB601/E-3 power is "takeoff power" 1,175hp/0ft for 1 min, but it so off-chart that no mainfold pressure nor other details such other temperatures or pressures haven't been listed for this regime in the manual. For those that look for factory rating of the "Battle of Britain" Bf-109 E-3, here are some other information from the manual (in metric); Top speed altitude (m) speed (km/h) 0 500 1000 510 2000 530 3000 540 4000 555 5000 570 (note: top speed, graph is linear to 5,000m then declines) 6000 565 7000 560 Tolerance +-5%. Standard atmosphere. Time to height: Altitude Time (min) 1000 1 2000 1.9 3000 3 4000 3.8 5000 4.9 6000 6.3 Tolerance +-8%, standard atmosphere. Speed Limitations: Max allowed speed: For dropping ailerons........................250 km/h With dropped ailerons.......................250 km/h With landing gear extended..............350 km/h Landing gear extension/retraction...220 km/h Max dive speed....................................750 km/h Best climb speed At altitude (m) At speed(km/h) 0 250 1000 243 2000 236 3000 229 4000 222 5000 215 6000 208 7000 200 Flight time Full throttle (i.e. max cruising power) at 6000m 1.1h. At other altitudes and reduced throttle according to engine fuel consumption. Max altitude 11,000 m at max takeoff weight (+-10%tolerance) Landing speed: 150km/h Nele NULLA ROSA SINE SPINA |
#52
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Comments;
1. One of the major improvements on the P47 (D25 on, I believe) was the paddle blade prop. made a marked differnce in climb and accleration and some in top speed. 2. The P51 from the start used energy revovery - engine heat 'energized' the cooling air which was efficiently exhausted from the ventral radiator and thus recovery thrust just about canceled radiator drag. About a year ago 'Air&Space' mag had an article by one of the designers on this subject. Odd not many other designers (Republic Rainbow - F12; Convair 240/440/T29) went this route. Walt BJ |
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