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FW190A-8 Erhöhte Notleistung - Boost - how does it work

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i've taken the time to read the NACA document, but i've not found a indication of the time limitation and the maximum manifold pressure tested was 39 in/hg, this is equal to 1.34 ATA . On the manual the maximum use of 1.42 ATA is explained by cooling reasons. there is no indication that this equipement will broke. And yes, as the hypothesis issued by JtD, this equipment was probably modified on late engine. if the engine can run longer at a higher manifold pressure and maximum temperature, it can work at a lower pressure.

Edited by Arsenal53

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Thank you all. This is a very interesting thread. Lots of information here. ;)

 

I did some climbtests from 0 to 6km alt with both planes (A5 and A8). I wanted to redo the climbtest Sgt_Joch posted in another thread which was done at erhöhte Notleistung to 8km alt with i guess 75% cooling flaps or position 3 in the A5s indicator. The real test was done with an A5 and the erhöhte Notlesitung system. The fun thing is that the ingame A8 runs hotter in both, oil and cylinderhead temps even when using normal power settings like Kampfleistung compared to the A5. The cylinderheads were so hot that the engine overheatet at about 5km alt and started to lose power but i reached 6km alt. Climbing to 6km with erhöhte Notelsitung engaged in summer conditions was impossible. Only in spring and atumn it was possible to reach 6km alt while overheating. In winter i was able to reach 6km without overheating. Climbing to 8km was not possible in spring, summer or autumn. All tests were done in QMB and without any weather. I will post some of my tests in case you want to see my results. Precedure might be very wrong but the heat is real.


 

Climb test with FW 190 A5 at 9:30h in summer conditions to 6000m alt.

Test 1: Groundstart FW 190 A5 with 60% fuel (314L) with outer wing guns mod. Engine at 1.32ata with cooling flaps 75% open. Climbing after takeoff at 265-275kph. Time to 6000m alt was 8:11 mins.

 

1:11 min to 1000m alt
2:23 min to 2000m alt
3:43 min to 3000m alt
5:08 min to 4000m alt
6:36 min to 5000m alt
7:46 min to 5700m alt
8:11 min to 6000m alt

 

Notes: No problems with temps.
 

--------------------------------------------------------------

 

Climb test with FW 190 A8 at 9:30h in summer conditions to 6000m alt.

Test 1: Groundstart FW 190 A8 with 50% fuel (319L) without any mods. Engine at 1.32ata with cooling flaps fully open. Climbing after takeoff at 265-275kph. Overheat started at 5280m alt. Time to 6000m alt was 9:02 mins.

 

1:16 min to 1000m alt
2:33 min to 2000m alt
4:05 min to 3000m alt
5:37 min to 4000m alt
7:18 min to 5000m alt
8:31 min to 5700m alt
9:02 min to 6000m alt

 

Notes: RPM and MP fluctuations due to overheating which caused a slight powerdrop.

 

--------------------------------------------------------------

 

Climb test with FW 190 A8 at 9:30h in autumn conditions to 6000m alt.

Test 1: Groundstart FW 190 A8 with 50% fuel (319L) without any mods. Engine at 1.58/1.65ata with cooling flaps fully open. Climbing after takeoff at 265-275kph. Overheat started at 4770m alt. Time to 6000m alt was 7:01 mins.

 

0:58 min to 1000m alt
1:56 min to 2000m alt = 0:58 min
3:03 min to 3000m alt = 1:06 min
4:10 min to 4000m alt = 1:06 min
5:22 min to 5000m alt = 1:12 min
6:18 min to 5700m alt = 0:56 min
7:01 min to 6000m alt = 1:24 min

 

Notes: RPM and MP fluctuations due to overheating which caused a slight powerdrop.


--------------------------------------------------------------

 

Climb test with FW 190 A8 at 9:30h in spring conditions to 6000m alt.

Test 1: Groundstart FW 190 A8 with 50% fuel (319L) without any mods. Engine at 1.58/1.65ata with cooling flaps fully open. Climbing after takeoff at 265-275kph. Overheat started at 5140m alt. Time to 6000m alt was 6:40 mins.

 

0:56 min to 1000m alt
1:53 min to 2000m alt = 0:56 min
3:00 min to 3000m alt = 1:07 min
4:05 min to 4000m alt = 1:04 min
5:17 min to 5000m alt = 1:11 min
6:12 min to 5700m alt = 0:54 min
6:40 min to 6000m alt = 1:22 min

 

Notes: RPM and MP fluctuations due to overheating which caused a slight powerdrop.

 

Can anyone give me some tips when climbtesting? How accurate one has to be? I mean holding the speed at exactly 270kph was impossible for me but i dont know how much of a different it would make in climb times when it goes up and down by a few kph. And what is the right procedure? I did my tests starting from the ground with full power until i reached 270kph and climb. The most different part for me. At what moment do i have to start the stopwatch? I started the stopwatch directly after the wheels leaved the ground. Maybe someone can link me an offcial doc or something where the exact procedure is described?

Edited by Ishtaru
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Fw190 A8 climb rate 15 meters/second

Specifications (Fw 190 A-8)Edit

220px-FW190_A8_3Seiten_Wiki2.JPG
Fw 190A-8 three view drawing
220px-Imperial_War_Museum_Plane_2.jpg
An Fw 190 A-8 (W-Nr:733682) at the Imperial War Museum showing faired-over gun ports and a belly-mounted ETC-501 bomb rack. This Fw 190 was used as the upper component for a Mistel flying bomb.

Data from Fw 190 A8[citation needed]

General characteristics

Performance

Armament

  • Guns:
    • 2 × 13 mm (.51 in) synchronized MG 131 machine guns with 475 rounds per gun
    • 4 × 20 mm MG 151/20 E cannon with 250 rpg, synchronized in the wing roots and 140 rpg free-firing outboard in mid-wing mounts.

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Only somewhat tangentially related but i think, potentially, many here (like me) will find this interesting. The guy has a lot of other equally interesting videos.

 

 

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