Sonder - Notleistung mit A Lader als Bodenmotor ?

[HoHun]

Hi Lutz,

>But the 700 km/h mark was way beyond the capabilities of the early prototypes.

I've got a page from Arado here that quotes 714 km/h for a BMW801-engined prototype with small wing and just 3200 kg take-off weight. The same information is repeated in the shape of a Flugzeug-Kennblatt for the Fw 190V5k in Hermann et al.'s "Fw 190 A".

Since Arado tested the A-2 and arrived at a 650 km/h top speed with 3778 kg and the big wing, the prototype speed doesn't strike me as exaggerated, regardless of whether it's calculated or flight test performance. The 3200 kg small-wing prototype has more of a record plane than of a fighter, so its speed is mostly irrelevant anyway.

(For perspective: Gollob's test of an operational A-2 versus a Me 109F-4 resulted in a superiority of the latter above 4500 m. That means the A-2 lost roughly 30 - 40 km/h compared to the Arado report. The BMW801C gave a lot of problems in frontline service, and obviously it had to be run at reduced power.)

>I assume that the US-tested A5 was a "clean" A5 fighter, meaning it had just the inner wing guns and the cowl guns and no ETC racks.
Than the plane would be something like 250-300kg lighter than a D9 with a takeoff weight of 4250-4300kgs.

The A-5 had no guns or bomb racks at all, but weight was adjusted to 3875 kg which seems correct for a 2-cannon A-5. Focke-Wulf gave the weight of a 4-cannon A-5 (with 90 rounds per MG FF) as 4000 kg and the top speed as 656 km/h. (The Focke-Wulf speed chart isn't that accurate - it's the one meant as example for the compressiblity error of the airspeed indicator. It has been discussed on this board before.)

Regards,

Henning (HoHun)

[HoHun]

Hi again,

>honestly i think the US numbers are a bit high.

The USN did a comparative trial of the same Fw 190A-5 against the F6F and the F4U, and the numbers match the detailed report pretty good.

They were flying the A-5 abreast with the F6F-3 and the F4U-1D, and the F6F-3 was slower at all altitudes except at sea level (where it was equal). The F4U-1D was faster below 15000 ft and slower above.

The USN reports says they weren't interested in absolute speeds but only in the speed difference and accelerated for just 2 min (which isn't enough to reach top-end speed). I'd rather trust the detailed report, but the USN report matches it quite well anyway.

Regards,

Henning (HoHun)

[Naudet]

If weight of the A5 was just around 3900kg i agree that the number seem to be correct.

And those charts about the protoypes seem to be very interesting.
If V5k managed 714km/h even V5g will pass the 700 km/h mark, as the speedloss in topsspeed was only 10km/h compared to the smaller wing.

[kreighund]

From "The Warplanes of the Third Reich" by william green;

T.O. Power 1750 Hp = 237 lbs
Combat S.L. 1636 Hp = 222 lbs
Combat 6km 1440 Hp = 266 lbs

I know there is a rating at 2240 Hp with ADi but I can't seem to locate it....