Author Topic: Issues that have been mentioned so far... (Read 819 times)

Karnak · « **Reply #15 on:** September 06, 2002, 06:30:13 PM »

The Fw190A-5 in AH sustains (on WEP) a speed of 407mph at 22,009ft.

Test method:

1. Take off in an Fw190A-5 with 75% fuel, no MG/FF cannon and no stores.

2. Use .wind command to quickly climb to 28,000ft.

3. Neutralize the wind and dive to 22,000ft, arriving at 22,000ft with a speed of ~500mph.

4. Start film.

5. Use autolevel to maintain altitude and proper trim.

6. When dial indicates 425mph, engage WEP.

7. Fly on autolevel until WEP expires, then end filming.

8. View film to get a precise readout of the speed rather than rely on the crude analog dial (which appeared to indicate 402mph).

RESULTS:
The speed gradually declined from 425mph and after 3 minutes and 10 seconds settled on 407mph, where it remained fro the remaining 7 minutes of WEP.

funkedup · « **Reply #16 on:** September 06, 2002, 06:42:18 PM »

There's 6 curves on that chart. 3 power settings with two curves for each power setting. Of the two curves for each power setting, the leftmost ones are more accurate because they include a compressibility adjustment (see the little equations in fine print). So top speed would be 656 km/h (408 mph) at about 6250 m (20505 ft).

-ammo- · « **Reply #17 on:** September 06, 2002, 06:42:32 PM »

I dont think the speed of the P-47D's are that far off really. The D11 shows 426 on the money in this film. This basically mirrors what Bodie says for the D25. I tested the D30, and as expected it is slower. It will run around 420. Both tests were at 25K, no wind, full of fuel, and light ammo load. Published numbers range from 426 to 428 TAS. Consider that those were likely taken from very "clean AC", AH'es numbers arent far off at all.

Both tests, I climbed to 28K, dove to 25 with wep on and recorded the film when it settled.

funkedup · « **Reply #18 on:** September 06, 2002, 06:50:13 PM »

And I agree with HoHun that the chart in this thread is probably based on calculations rather than flight tests. The charts in F-TR-1102-ND include the flight test data points which don't have the beautiful smooth appearance of calculated or curve-fitted data.

Heinkel · « **Reply #19 on:** September 06, 2002, 07:03:27 PM »

190 speeds

J_A_B · « **Reply #20 on:** September 06, 2002, 07:34:42 PM »

Thanks for the work Karnak. And thanks for the chart Heinkel, although the good information on that chart pertains more to the A4 and A3 (note the source of the line for the A5).

Does anyone have the engine power diagrams for the 190A-5 available? It seems that the BMW's performance is what the issue with the A-5 boils down to. If indeed it performs as HoHun says, than the AH 190A-5 is correct as it is.

Thanks for the P-47 trials AMMO.....does the P-47 speed up a bit if you were to do that at a little higher altitude?

I recall there being a website with speed and climb info for the 109G-10 as it performs in AH; would it be possible for somebody to use that information and create a new graph to submit to HTC to replace the current, incorrect one? That IMO seems an easier (and quicker) fix than to simply wait for a change to the 109 FM, and both sets of numbers are doubtlessly right for *some* of the G-10's which saw action. Perhaps this could also be done for the Ta-152

Of course such a measure is a temporary, band-aid at best since what both aircraft really need is a FM revision, but we as players have no direct control over that

Actually, with regards to the 109G-10, IMO the best solution would be to re-model the G-10 as the earlier ones perfomed (4600 FPM 426 MPH) and then add a 109K-4 as a high-performance (4800 fpm 452 mph) version. The G-10 doesn't handle the speed as well anyhow. Doing that would also fill a gap that we have currently in 109 performance.

J_A_B

Heinkel · « **Reply #21 on:** September 06, 2002, 07:40:09 PM »

190A-5 had BMW 801D

Heinkel · « **Reply #22 on:** September 06, 2002, 07:40:53 PM »

whops...pic is gonna come out bad. I could send it to you if you want, it's a 1.1 meg BMP.

J_A_B · « **Reply #23 on:** September 06, 2002, 07:49:16 PM »

I don't currently have a functional E-mail addy, and I'm not technically inclined enough to be able to intrepret it very well anyhow. There are however a number of guys on this forum who can do exactly that, and they might be interested in that chart. Where did you pull that from BTW?

J_A_B

Heinkel · « **Reply #24 on:** September 06, 2002, 07:52:25 PM »

I think I saw that in one of my books about aircraft engines (which I dont have atm, will get you a name asap), but that specific scan of that chart I think I found on this BBS someheres in one of the 190A-5 threads

Wotan · « **Reply #25 on:** September 06, 2002, 08:02:50 PM »

heinkel upload the chart to the squad web space and link it.

just make a seperate folder and put the image there .

Heinkel · « **Reply #26 on:** September 06, 2002, 08:05:46 PM »

ok lets see if this works...

Heinkel · « **Reply #27 on:** September 06, 2002, 08:13:58 PM »

BTW: I have the United States evaluation report of a captured 109F. It lists it as being able to carry 500 rounds in each 7mm, and 200 rounds in the hub 20mm. Incase anyone wants to see it.....

Heinkel · « **Reply #28 on:** September 06, 2002, 08:22:00 PM »

109F - more ammo plzz

Heinkel · « **Reply #29 on:** September 06, 2002, 08:36:55 PM »

Actaully, I just found this on my PC. The A-5 carried the BMW801D-2. The chart above is for the 801D in general. This hcart is specifically for the 801D-2