Ki-46 'Dinah'
- Thread starter Laurelix
- Start date
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Riddle me this?
Why did the climb time of the Ki46-III increase by 8m 13s over the -II when it got 600hp more at altitude? Its been confusing me for years! The climb for -III must have been done as some low cruise setting?
Note the very heavier Ki46-IV outclimbs the -III handily (in this table), yet the turbos don't give any more power until over 6000m
Why did the climb time of the Ki46-III increase by 8m 13s over the -II when it got 600hp more at altitude? Its been confusing me for years! The climb for -III must have been done as some low cruise setting?
Note the very heavier Ki46-IV outclimbs the -III handily (in this table), yet the turbos don't give any more power until over 6000m
- Thread starter
- #3
usually engine power is stated with take off power.
However military power of both engines might differ a lot proportionally.
Then theres the aspect of critical altitude
lets say a engine has critical altitude of 6000m and another with critical altitude at 8000m, that can cause a significant difference in how fast they can get to 10,000m
I think there is a transcription error in the -III data. Most likely 20:15 is the 10,000m time for Ki46-III. This would nicely fit the data set to plane characteristics 
Looking at the 5,000-10,000m climb, as a high alt recon plane
5,000 8,000 10,000
Ki-46-I 7:45*# 15:01# 26:28#
Ki-46-II 7:24# 11:58*/13:15# 22:21#
Ki-46-III --- 20:15* ---
Ki-46-IV --- --- 16:30*
* Bunrindo Data
# JAAF test/pilot manual data
The Ki46-II had a lower wing loading which might help its climb, but the Ki46-III power loading is better, so it probably climbs at a shallower angle but at a higher plane speed.
The Ki46-IV data is interesting it seems it climbed without using the Turbo for the first 2 mechanical stages, then at 5800m went back to 1st gear but with Turbo, then 2nd gear and turbo over 7400m. I think the P-47 also didn't use its Turbo below 2000ft or so?
Looking at the 5,000-10,000m climb, as a high alt recon plane
5,000 8,000 10,000
Ki-46-I 7:45*# 15:01# 26:28#
Ki-46-II 7:24# 11:58*/13:15# 22:21#
Ki-46-III --- 20:15* ---
Ki-46-IV --- --- 16:30*
* Bunrindo Data
# JAAF test/pilot manual data
The Ki46-II had a lower wing loading which might help its climb, but the Ki46-III power loading is better, so it probably climbs at a shallower angle but at a higher plane speed.
The Ki46-IV data is interesting it seems it climbed without using the Turbo for the first 2 mechanical stages, then at 5800m went back to 1st gear but with Turbo, then 2nd gear and turbo over 7400m. I think the P-47 also didn't use its Turbo below 2000ft or so?
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