more radial fans like fw190?

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

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