Nakajima Ki-87-Ⅰ's engine was a Nakajima HA219RU(HA44-12 RU) 18 cylinder air cooling turbo charged engine.(2,450hp in take off/2800rpm, 2040hp/11000m/2700rpm, bore146mm×stroke160mm, displacement 48.2L, length 2110mm, diameter 1280mm, dry weight 1150kg, compression ratio 7.5) same as Tachikawa Ki-94-Ⅱ's engine.JFC Fuller said:Can anyone clarify what engine the Ki-87 was actually using? Some sources say it was a Mitsubishi engine called the Ha-215 whilst others say it was the same Ha-219RU that was used in the Tachikawa Ki-94-II..?
In September 1945, Kugisho(of the IJN) reported to the U.S. that KO fighter which under development were Shiden-kai with Nakajima Homare HA45-44 engine, Reppu with Mitsubishi HA43-51 engine and Reppu with Nakajima HA44-21 engine.JFC Fuller said:Blakkite, thank you again!!!
Did the 20-Shi fighter keep the pressurised cockpit of the Ki-87 and Ki-94 or did it have a standard non-pressurised cockpit? If it did not have a pressurised cockpit it seems to be very similar to the Ki-117.
Was a final design ever chosen by the IJN for the 20-Shi specification?
blackkite said:In addition, the IJN ternimated to use Shi naming system for experimantal aircraft in 1943, so 20-shi KO fighter was not a official name.
Yes I think so,too. Good guess.windswords said:gerhard said:
My guess is that the design proposal never went forward enough to be given an official designation - But I think that N1K6-J would have been logical.