Ki-84 should be faster

[CPW]

I purchase a book about Ki-84. It says the max speed 624km/hr was flown by prototype. But the engine is Ha45-special, the same with Ha45-11(1800HP).

Although Ki-84Ia's Ha45-21 is 2000hp, it was limited in 1800hp on early production type. Japanese always sets limiter to new engine,not only Ha45.

Later production type would release limiter, and should be faster.

Ki-84Ib reach to 660km/hr in Japanese flight test. It was installed the same engine with Ki-84Ia.I believe Ki-84Ia late type could get the same speed,too.

The book also mention about Ki-84Ia had three kinds rudder and different External hardpoint position between early and late type. And late type had bigger oil cooler.

[Saxman]

Japanese fuel quality was also....lacking, which tends to decrease engine performance.

[trotter]

I think that the frank flying faster would be a disadvantage, given the aircraft's tendency to shed parts (and turn terribly) at high speeds

Even if it was capable of the standards you have posted, would it be of any tangible difference?

The "fast" plane that gets in a firing position is entirely susceptible to evasize manuevering if it can't also handle itself at the speed it is at.

[tedrbr]

Syndicated threads on again tonight?

Issue has come up many times.  Use the Search Features, but essentially, the Ki-84 in game is based on actual ones from forward combat areas and the octane fuels they had available to them.

Yes, some Ki-84's been clocked faster in test flights, but usually with superior fuel used in the tanks.

[CPW]

Originally posted by Saxman
Japanese fuel quality was also....lacking, which tends to decrease engine performance.

Maybe not so lacking. The book says ki-84 always get good quality fuel.

The best fuel for ki-84 is from New Guinea, 100 octane.

Japanese homeland defensive period, 95 octane. This was been checked after war. When this time Ki-61 series used the 87 octane.

Manual says the lowest for Ki-84 is 91 octane.

[CPW]

Originally posted by tedrbr
Syndicated threads on again tonight?

Issue has come up many times.  Use the Search Features, but essentially, the Ki-84 in game is based on actual ones from forward combat areas and the octane fuels they had available to them.

Yes, some Ki-84's been clocked faster in test flights, but usually with superior fuel used in the tanks.

I have searched and too many threads. Can't read them all.So I posted.

But the max speed 660km/hr was tested by Japanese in the war. The best fuel they have for Ki-84 is 95 octane.

The book considers the effect from US high quality fuel are not so deep.

If Ki-84 can fly so fast, it should be able to dive faster,and get better climb rate. The fuselage should be stronger,too.

[moot]

Someone in Japan was working with Pyro (right up to the last minute, IIRC) on official documents, so the odds are that whatever is in your book was only a part of the Ki84 data HTC got to base their model on.

[Kweassa]

It was busa01 IIRC.

 I'm not sure just what went on between busa and Pyro, but the impression I got from when the Ki-84 was first introduced (and then shortly revised), was that Pyro was very willing to receive new info, and busa was also keenly interested in trying to find actual documents that confirmed much higher speeds for the Ki-84... but despite the search, and busa himself being of Japanese nationality, he still couldn't find any real evidence or objective data that put combat aircraft flying faster than the speeds we have now.

 Personally, I'm willing to believe that the Ki-84 performance we have in the game, is as objective as it can get.

 The only thing I'm a bit miffed about, is that the acceleration rate of the Ki-84 falls more close to the levels of P-38 or 109s. Being mounted with such a powerful engine in such a light airframe, I'd have expected it to be more close to the Spit16 or the La-7 when it came to level-flight acceleration.