Curious information about N1K2 "George 11"

[DarkglamJG52]

Look the altitude vs speed char here. A bit  different the speed at SL
that in the AH Niki char. Somebody has more resources/info about
N1K2 performance?

[F4UDOA]

Yes,

A couple of differences.

1. That is a NIK1, not a NIK2. Notice the Mid wing design instead of the low wing. The NIK1 was actually faster and lighter.

2. Those results were from a test with American 100 octane fuel. The Japanese were using 87 octane fuel.

[Vermillion]

F4UDOA, your mistaken in this case.

It was the Ki84 that was tested with 100 octane fuel postwar, and made 427mph.

DarkGlam, notice that Butch's chart says TAIC?  

These aircraft performance and characteristic were issued by the Naval Intelligence Division,US and British Services attached to the Technical Air Intelligence Center , Naval Air Station, Anacostia DC

Note from the TAIC manuals:

Performance Calculations:  Except where otherwise noted, performance figures represent estimates of the Technical Air Intelligence Center adn have been calculated after careful analysis of information derived from intelligence, captured equipment, drawings, and photographs.  When authoritative evidence was not available, it was the policy of the TAIC to give Japanese Aircraft Performance every benefit of the doubt within reasonable limits.

So basically these were estimates and calcualtions of enemy aircraft performance during the war.  However, in reality the Japanese airforce and naval air forces suffered from low production quality and lack of high quality av gas which greatly decreased effectiveness.  Plus, there was a "safety margin" built into the estimates.

I'm not saying the data HTC uses is perfect, I'm sure its got some holes in it, but its at least the AH plane is based upon wartime flight tests by the Japanese manufacturers.

[DarkglamJG52]

Originally posted by F4UDOA
Yes,

1. That is a NIK1, not a NIK2. Notice the Mid wing design instead of the low wing. The NIK1 was actually faster and lighter.

True, good observation.  

Originally posted by F4UDOA


2. Those results were from a test with American 100 octane fuel. The Japanese were using 87 octane fuel.

92 octane fuel  according to the TAIC paper.

 
3.  Tht  N1K2-J don't have the 2x7'7mm  (or 13mm) over the engine.

[DarkglamJG52]

Originally posted by Vermillion

DarkGlam, notice that Butch's chart says TAIC?  

Yes I was surprised well with the TAIC document. The vulnerability diagram is cool. TAIC document's are avaibles(free info) for dowload from the net?  

Originally posted by Vermillion
I'm not saying the data HTC uses is perfect, I'm sure its got some holes in it, but its at least the AH plane is based upon wartime flight tests by the Japanese manufacturers.

My post isn't a whine about FM of N1K2-J. When I am on deck all hi Nikis are too fasters and overmodelled .


N1K1-J seems better what N1K2-J.  A Niki with 355MPH  SL and 315-320MPH 18k  should be very dangerous.

[F4UDOA]

Verm,

I have a copy of the TAIC. That note does say when the data isn't available. If they didn't flight test it how did they know the fuel octane??

[Vermillion]

Because that was the standard Japanese fuel!

The Americans captured a crashed N1K1-J in late 1944 (if I remember right) but it was unflyable and beyond repair, and thats what the report was based upon from examining the wreckage.

Hehe me and Pyro have been over this issue back and forth quite a bit in the early days in AH.  I use to be a big believer in the TAIC stuff, and it still has quite a bit of good data, but I take it with a grain of salt now.