Recent content by tomo pauk

1.16 is the value of the coefficient 'K', that is calculated by this: K =S/(π*b^2 *e), where: S = wing area b = wing span e = Oswald's effciency (K is given in the table, so there is no need to calculate it) K is used in this equation, to calculate the total drag: Cd = Cd0 + K(Cl)^2 With Cl...

0.411 m^2 = 4.423967 sq ft, or roughly 4.43 sq ft. I'm not sure that I follow the numbers you've posted. Paging @Aeroweanie I can translate most of the details, just give me some short time to do it properly. No worries :)

The member's name is Calum Douglas. You can contact him at twitter and facebook.

That the book is not based on primary sources was verbatim from the user you've quoted.

Seems like that the primary sources were not consulted. If that is true, books can be pretty much just the opinions of a writer, and not something that is factually correct. Nothing wrong with having the opinions, but it means that the work is pretty much worthless for someone that likes facts...

87 oct fuel = max boost of +6.25 between SL and the rated altitude (~18000 ft with ram). 100 oct = max boost of +12 psi between SL and ~10000 ft (with ram).

R-2600 diameter was 55in, that of the R-2800 was 52.8 in. Navy and/or Grumman was perhaps of the opinion that P&W has it's plate full wrt. next-gen engines for the fighters, so the 2-stage supercharged R-2600 was a way to cover their bets? There is no doubt that the blunting was a team effort...

R-1830 was the Twin Wasp. The Wasp was not a military engine for the 1st line aircraft, while the R-2800 was the Double Wasp. Sakae indeed was a decent engine, but being better than the 4th and 5th best US engines is not something to be proud of, IMO. IMO, Grumman with Wildcat didn't take the...

Stating that something is 'pretty clear evidence of a switch' without providing the dates and factory outputs will not going to cut it.

A definitive 'yes'. American small radials powered the aircraft that sent the big chunks of the most potent Japanese naval force to the bottom of the sea before 1942 ended. Neither Merlin nor the V-1710 qualify under 'big radials'. I'm not sure what the British (and other people's) fighters...

If any of the curves in the jpeg picture/graph you've posted were actually achieved with over-boost, the best speed would've been achieved at ~10000 ft, not at around 17000-18000 ft. My conclusion is that the graph you've kindly pprovided is misleading in the way that it adds ever greater amount...

How do you figure?

Ta 152 predates the D-12. There was no switch, either.

Nothing complicated about the engine cannon, just the engine needs to be set that way. Eg. French have had engine cannon installations on their fighters already in ww1. Wing tanks on the Dora were probably mooted a few months past the May 1944 memo. Zero lift drag - ie. drag at high speed -...

In may of 1944, Fw listed a few reasons as to why the Ta 152C is a better choice than the Fw 190D: - easier installation of intercooled 2-stage engines (213E, 603L (or LA?)) due to place constrains wrt. the undercarriage space 'collision' vs. the engine bay - no possibility for MK 103...