Author Topic: 109 it fly wrong  (Read 16031 times)

Offline MiloMorai

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109 it fly wrong
« Reply #210 on: May 18, 2004, 05:25:26 PM »
So nice of you to mention Barbi, using your Russian graph, that the Spit was up to 20kph faster than the G below ~6200m.:eek:

Quote
Is it only me who sees the single-stage 109G-4 w. gunpods happens to be a good 15 km/h faster at altitude than those super-duper two stage Merlin Spits of 1942/43



Correction Barbi, BS310 used a Merlin 70 which makes it a HF.:) Nice selective choice of data, for the max speed of 405mph(tas) was reached at 25400ft (652kph@7742m)

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Spitfire IXLF (BS 310), ie. 650 km/h at 5950m, 642 km/h at 7500m.





Max cruise at altitude

G-6 - 596kph@6km (370mph@19685ft)
G-6/AS - 625kph @8.4km (388mph@26246ft) range 625km(388mi)

recorded by General Luftzeegmeister/C-E2 late '44

At 27000ft, the Spit BS310, did 650kph. Now there must be something wrong with Barbi's math, for 650 is a larger number than 625.

Quote
the speeds of /AS and D equipped 109s of 1944, ie. they could cruise faster than the Spit IX could attain at full WEP at 8km.

Offline Crumpp

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109 it fly wrong
« Reply #211 on: May 18, 2004, 07:41:25 PM »
Good God....

I fly exclusively Luftwaffe Iron.  As a Generalization, Face it guys, with the exception of the Dora and the 109K LW Iron was behind the performance power curve.  You simply have to be a better pilot to be successful in them.


Crumpp

Offline HoHun

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109 it fly wrong
« Reply #212 on: May 19, 2004, 01:09:16 AM »
Hi Butch,

>The blower was definitely lacking some speed here else the increase in performance would have been much better. One would have expected a maximum output of 2075PS@2200m with a better blower while in real life 2050PS were achieved at 500m or so.

Well, there are multiple limitations to power at the high end that aren't necessarily caused by the supercharger.

The final power output probably was the result of carefully tailored compromises, and being below the optimum at low altitude wouldn't have been much of a problem as combat usually took place at medium to high altitude anyway.

Even with the limitation, the Me 109G-10 still is superior in speed and climb at low and medium altitudes to the P-51D, and still retains the climb advantage at high altitude. If compromises were necessary to achieve that kind of performance, I think Daimler-Benz picked them rather well.

In the end, it's performance that counts, and the late-war Me 109 was excellent in that regard.

Regards,

Henning (HoHun)

Offline HoHun

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109 it fly wrong
« Reply #213 on: May 19, 2004, 01:47:08 AM »
Hi Gripen,

>Those Russian charts are a very good example; performance curves are wrong shaped for the DB605.

Hm, what do you mean? I believe they have made wrong assumptions about the convex/concave shape of the different sections of the graph, but overall, the shape of the Russian speed charts seem to show a fairly accurate portrayal of a single-stage, variable-speed supercharged DB605.

Regards,

Henning (HoHun)

Offline gripen

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109 it fly wrong
« Reply #214 on: May 19, 2004, 03:18:53 AM »
HoHun,
That's exactly the problem; the chart might not be based on real tests or the test data  contains just couple test points.  The Fw 190D curve has a very similar error. Overall I don't rate this kind of charts as reliable source, it would be much better if the real test data comes available from the Russian arhives for better judgement.

gripen

Offline VO101_Isegrim

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109 it fly wrong
« Reply #215 on: May 19, 2004, 09:30:13 AM »
Quote

So nice of you to mention Barbi, using your Russian graph, that the Spit was up to 20kph faster than the G below ~6200m.

Not bad for the 109G, since in these tests it carried gunpods which decreased speed by 8-15 km/h. But even this way, it`s superior to the two-staged Merlins at altitude, which is something being discussed.



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Correction Barbi, BS310 used a Merlin 70 which makes it a HF.:) Nice selective choice of data, for the max speed of 405mph(tas) was reached at 25400ft (652kph@7742m)


You can only correct something that is incorrect, Moron.

ie.:

http://www.fourthfightergroup.com/eagles/ma648.html

4.2 Comparison of results with other Spitfire LF.Mk.IX aircraft. Figure 1 gives comparitive curves and the results are summarised in the table below:

Spitfire LF MkIX. BS.310
Engine : Merlin 66


http://www.fourthfightergroup.com/eagles/ma648speed.gif



Quote
At 27000ft, the Spit BS310, did 650kph. Now there must be something wrong with Barbi's math, for 650 is a larger number than 625.


Or maybe it`s Moron makes an idiot of himself again. :D

Offline VO101_Isegrim

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109 it fly wrong
« Reply #216 on: May 19, 2004, 09:40:15 AM »
Quote
Originally posted by HoHun

Hm, what do you mean? I believe they have made wrong assumptions about the convex/concave shape of the different sections of the graph, but overall, the shape of the Russian speed charts seem to show a fairly accurate portrayal of a single-stage, variable-speed supercharged DB605.


Just checked the Soviet speed curves vs. real-life German testing of WrkNr 14026, and there is perfect agreement between the shape of the German curves, and the altitude of 'break points'.
Dunno what Gryphon talks about again. Doubt that he does, either.


Both curves show the same, increasing performance gain with altitude up to 4700-4800m, which bulges out at 2500m. From 4800m onwards, the performance gain is linear up to 7000m, where the Volldruckhohe is reached.

It follows the power curve a un-rammed DB 605A, ie. which develops 1475 PS at 0m, that increases to 1550 PS at 2100, where the second s/c speed kicks in drains some performance gradually as the s/c spins up, until 5800m VDH, by which point it slowly decreased from 1550 PS to 1355 PS.

Under high speed level flight, this trends happens at a somewhat higher altitude.


Offline MiloMorai

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109 it fly wrong
« Reply #217 on: May 19, 2004, 09:46:34 AM »
Want to try again Barbi? Here is from the 4th site



LOL it says HF Mk IX BS310 (Merlin 70)

So not only your understanding of which number is greater than another but you have trouble reading.


This chart gives no indication to what model and engine fitted to the Spit.:rolleyes:

http://www.fourthfightergroup.com/eagles/ma648speed.gif

This is what your link goes to

Please note the serial number, MA648.:eek:

Someone is appling the 'moron' name to the wrong person Barbi. Stop looking in the mirror..:rofl :aok


These are the Spits tested on the 4th site:

Spitfire F. Mk. IX BF.274 (Merlin 61)
Spitfire F. Mk. IX BS.428 (Merlin 61)
Spitfire F. Mk. IX BS.543 (Merlin)
Spitfire F. Mk. IX BS.55166 (Merlin 70)
Spitfire HF. Mk. IX EN.524 (Merlin 70)
Spitfire HF. Mk. IX BS.310 (Merlin 70)
Spitfire IX JL.165 (Merlin 66)
Spitfire LF Mk. IX MA.648 (Merlin 66)
« Last Edit: May 19, 2004, 10:14:08 AM by MiloMorai »

Offline VO101_Isegrim

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109 it fly wrong
« Reply #218 on: May 19, 2004, 10:10:15 AM »
I kinda expected such hysterical reaction, and Moron getting himself even deeper in the mud.

Even if all he had to do is to go here,
http://www.fourthfightergroup.com/eagles/ma648.html
and scroll down to Paragraph 4.2.. :rofl

Gscholz summerized you the best, Moron.

Offline mw

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109 it fly wrong
« Reply #219 on: May 19, 2004, 10:15:18 AM »
Milo:  You're barking up the wrong tree.  BS.310 was a trials machine that was equipped with various engines including the Merlin 66 and 70.

gripen:  Performance results from flight trials of DB 605 A engined 109 Gs is rather interesting and informative ;)

Offline Crumpp

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109 it fly wrong
« Reply #220 on: May 19, 2004, 10:53:23 AM »
Milo,

Isegrim's data is consistant with Eric Brown's assesment of the 109G's series remaining a very competative dogfighter above 25,000 feet.

Crumpp

Offline MiloMorai

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109 it fly wrong
« Reply #221 on: May 19, 2004, 11:06:21 AM »
Are you really that stupid Barbi? It would seem that you are. The Merlin 70 engine is a high altitude rated engine, so why would BS310 have a LF designation. BS310 is a HF that had a 66 installed, for a short time. Stop calling yourself a 'moron'.


Now what does this say? 3rd time posted, so read very carefully






mw, not according to the list of Spitfires that have test results on the 4th site. Note this is Barbi's reference source. It is also selectivity on his part to show the Spit in the worst posible way.

BS310 was manufactured(31.8.42)) as a HF, that had for a very short time, a 66 installed. Note the date of the BS310 and MA648 tests. Why did Barbi not give the data for MA648 which was the main subject of the report?

Some graphs to look at



Offline mw

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109 it fly wrong
« Reply #222 on: May 19, 2004, 11:27:27 AM »
Milo: compare BS.310's curve and FTHs on the chart you just posted with the other Merlins; nuff said.   I can prove you wrong, but that's not my intent.  My advise, partly why I posted, is just drop that particular line of discussion, its a bad investment.

Offline VO101_Isegrim

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109 it fly wrong
« Reply #223 on: May 19, 2004, 11:56:36 AM »
Yeah, LOL, Mike was rather busy with those silly graphs during the last few days, it was fun to observe his progress. A genuie example of the 'credibility' of his site, he picked the worst performing 109s he could find, piled them together and compared them with hand-picked Spitfires.

As a matter fact, just look at a few examples what he compares :

109 G-1 Werknummer 14 026. Produced in February `42, ever since a testhack of Messerscmitt. The curves that he took are from a six week series of trials, that investigated the performance difference between DB 601E and 605A, primarly at ground level, and the radiator temperatures when built in the same airframe; altitude measurement we of secondary nature.

The plane went through 10 testflight, during which the engines were swapped 3 times, first the 601E was tested, then the 605A. One can imagine the aiframe`s condition by August 1942, when the 605A trials started... though I guess the most telling is the facts presented in the reports, ie. speeds achieved early in the trials with 601E and 605A in the end (both at Kampfleistung):

at 0m:
601 E : 514 km/h
605 A : 507 km/h

At critical altitude (VDH)

601 E : 622 km/h at 6000m
605 A : 627 km/h at 6100m

Now considering that the power outputs of 601E vs. 605A at 1.3ata:

601 E : 1200 PS at 0m, 1050 PS at 6000m. FTH : 4900m
605 A : 1310 PS at 0m, 1225 PS at 6000m. FTH : 5800m

Notice that the 601E powered 109G-1 gained 1100m due to the ram effect. By the time it was powered by the 605A, it only gained 300m .

Of course there are loads of other trials, each show the 109Gs rated altitudeplane`s as 7000m.

etc.


Also one wonders, how did Miky miss the Rechlin tests of G-1... you know, the ones that states 403 mph at 23 000 ft at 1.3ata ? But he makes qoutes from the very same Rechlin page a bit below. :D

Would you want to guess why it isn`t presented ? Or why the Finnish, NIIVVS trials with 109G-2 at 1.3ata are 'missed' somehow?



Now let`s see the Spitties he chose..oh, fine selection, indeed :

Mk IX, BS 543 : The prototype Mk IX LF tested well before the type went into service. Experimental engine, experimental propellor, none of which went into production in the same form.
409 mph is very nice, in fact, faster than the Mk VIIIs which were supposed to be faster than the Mk IXs. :D

But wait, there`s it little brother, BS 551, the HF prototype from the same experiments the previous comes from. Just about the same relevance to the actual performance of the serial plane, just compare EN 524, the serially produced HF Spit.


Mk IX, MA 648. Same trick by Mike, another prototype, this type with a experiment with the SU fuel pump. 411 mph, WOW, not bad for a prototype that never saw any service

No, I wonder, why this classy selection misses good old JL 165, a 'standard Spitfire Mk IX LF' to qoute it`s perfomance trials, that managed to do... uhm... 388 mph.


If someone wants, can make such interesting comparisons, Williams style, one can make it in a similair manner.

Say, take the G-2 tested by the NII VVS, and compare it to JL 165. :D

Yep, 413 mph done by the 109 at 23k ft, vs. a laughable 389 mph by the Mk IXLF. Hey Miky, isn`t that tough for an 1943 Spit not only to be outrun by a 109G by 25 mph at altitude, but it`s also
left behind by a two year older Bf 109F model?


You know, if I were Mike, and I would know what I knew what is coming, I would be really, REALLY quick in getting that page off the site, before perhaps it will be made an example about the mass number ofmanipulations going on that little spitty site.
A`la the Carson debunker articles. :D

I bet that would give some flavour to the site`s 'credibility', far and wide. :cool:

Seriously, the particular page can be hardly considered to be anything more than a byproduct of being a Spit zealot`s 109-envy, in which the extreme bias and the smell of primitive little tricks can be smelled a mile away. And if needed, I will prove that, line by line, and then make public for it, along with exposing every other silly little trick of that site, starting with the selective qouted Bf 109E evaluation, cutting half of the 109E vs. Spit I roll rate chart by Miky, or how he plays with holding back information about how exactly 'common' were the performance specs he posted for +25 lbs XIVs. All data needed for that is available to me and more. It`s rather boring to see those BS comparisons on Mike`s site, with the intent of misleading the public and serve the agenda.
« Last Edit: May 19, 2004, 12:16:47 PM by VO101_Isegrim »

Offline Angus

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109 it fly wrong
« Reply #224 on: May 19, 2004, 01:12:38 PM »
I am sure that Milo comes up with an answer, and this thread shall go on......and on....and on.....

But seriously, would I be wrong in concluding that the Spitfire is a slightly slower plane pr. Hp while being a better climber (Newtons) pr hp?

I'd rather agree on that, but that's just me :D
It was very interesting to carry out the flight trials at Rechlin with the Spitfire and the Hurricane. Both types are very simple to fly compared to our aircraft, and childishly easy to take-off and land. (Werner Mölders)