Recent content by Holtzauge

Timppa, I think to credit the good performance of the P-51 to a single factor is a bit simplistic. I agree with Drgondog: I think there is not a single factor but that the cooling system, wing profile, workmanship on joints and rivets and general clean lines of the P-51 all contributed. As I...

Concerning radiator and landing gear placement: Which came first? The hen or the egg? BTW, the simple reason the Me209 and 309 did not make it into production is obvious when you look at them. They are simply to ugly. No teutonic knight worth his salt would ever mount one. Infantry service...

I remember reading about the P-51 duct problems and the "rumbling" sound somewhere else as well but do not remember the source right now. Interesting that they both solved the rumbling AND managed to lower the mass flow at the same time. Since the mass flow would be governed by the cooling need...

Please quote the RAE report or post the data. Just quoting "RAE" is a bit vague no? Also profile drag if just a part of the total drag so no surprises if the PERCENTAGES above are higher than 14% as Hoerner claims as the cooling drag percentage of the TOTAL drag not just the profile drag. A...

I think the good low drag characteristics of the Mustang is also in part due to the wing profile. Surface imperfections will certainly cause transition to turbulent flow in a wedge shaped area behind the imperfection but going spanwise a wing kept in reasonable conditions by a good crew chief...

1) Hoerners was a professional aerodynamicist in Germany during the war and got a job doing the same in the US after the war so I guess they thought him competent enough. Frankly, I rather trust NASA judgement on this than yours. 2) His books are classic and well known in the aerospace...

Some more input on the poor Me109G radiator design relative the Fw190D: The high radiator drag for the Me109G of around 14% as compare to the 8.8% figure for the Fw190D9 is according to Hoerner explained by Messerschmitt themselves: Me reports 109/10/L/1941 and 109/15/L1/1942 states that the...

I think the very good radiator design was one of the major reasons for the the P-51's very good speed performance relative other contemporary designs. However, I seriously doubt that the system actually produced thrust. What it probably did though was to produce considerably less drag than the...

The answer to "by what laws of physics would one "unusally large" radiator be superior to two normal-sized ones" is pretty simple: For a given flow rate, the wetted area in a single duct is less than the wetted area of two ducts. Thus the loss of momemtum prior to entry into the radiator and...

Hi HoHun, Concerning etiquette, others I have shared information with have had the good manners to ask before sharing it with others, something I have not had any objections to so far. None have posted my research material without asking me beforehand. None have manipulated my material with...

Well, from the above I think all those who read this understand why I do not share information with this person anymore. I have exchange research material with a lot of people over the years and there has only been the above incident where my material has ended up manipulated on the internet...

I would like to inform those of you who read “Kurvewendigkeit der Me-typen II Telberich” at Kurfurst - Your resource on Messerschmitt Bf 109 performance that this document is the result of research work on my part and that Kurfurst has manipulated my images with his own watermark and posted...

Yes, it does contain some nice info and astute observations does it not? Typical German thoroughness! Some quick comments on some German observations: Page1: "Flugzeugfuhrer....bemängeln die etwas geringe Längdstabilitet". So the Germans think it's too sensitive in pitch. Intersting to...

Hi, I have long been a frequent visitor here and uploaded lots of stuff. So now I think it is time to reverse this and therefore I attach an article I scanned from the German magazine Luftwissen. Also, I would like to extend my personal thanks to Micdrow for his tireless work in this forum...

So it was as I suspected: You are implying that I am misquoting or hiding something. Well you can take a hike buddy. You have provided nothing substantial in this thread and now you resort to personal attacks and insinuations. Goodbye.