Ha-43 MK9D - J7W1 Engine, pls end my suffering

Laurelix · Feb 29, 2020

J7W1 engine

Japanese Secret Projects Experimental Aircraft 1939-1945

Take off: 2130hp
2020hp at 1180m
1160hp* at 8700m

*Maybe a typo meaning to say 1660hp

——

Bunrindo Famous Airplanes of the World: J7W1 Shinden

Take Off: 2030hp or 2070hp?
1850hp at 2000m
1660hp at 8400m

-

——

X-Planes of Imperial Japanese Army & Navy

Take Off: 2130hp
1660hp at 8700m

——

I don't know about you guys but I'm completely mind ****ed. WHAT IS THE REAL POWER CURVE OF Ha-43 MK9D?!!!

Ok let's look at it more easily, the 3 power curves side by side from the 3 sources.

Take Off Power:
Source 1: 2130hp
Source 2: 2030 or 2070hp
Source 3: 2130hp

Military Power at 1st altitude
Source 1: 2020hp at 1180m
Source 2: 1850hp at 2000m
Source 3: N/A

Military Power at 2nd altitude
Source 1: 1160hp* at 8700m
Source 2: 1660hp at 8400m
Source 3: 1660hp at 8700m

* Possibly typo meaning to say 1660hp

Laurelix · Feb 29, 2020

I think I know the answer. Although bunrindo states the take off power at 2030/2070 if you look at the power curve of the engine diagram, we can see the engine capable of going to 2130hp at take off and even to 2200hp output.

Too bad i dont know what it says in the box top right to see what each lines represent, but from what i can see power curve

Engine Power Set Up 1:
1730hp at SL , 1850hp at 2000m, 1660hp at 8400m

Engine Power Set Up 2:
Around 1900hp at SL, 2000hp at 1800m, 1720hp at 3150m, 1830hp at 5000m, 1530hp at 6450m, 1660hp at 8700m

Engine Power Set Up 3:
2030hp at SL, ??? at 1000m, 1900hp at 6450m, 1780hp at 9500m

Laurelix · Feb 29, 2020

Some chinese guy told me whats in the box on top right. Type 843 engine for different fighters:

J7W1 power curve is
Take Off Power can be 2030hp/ 2130hp/ 2200hp

Military Power:
1730hp at SL, 1850hp at 2000m, 1660hp at 8400m

azador1606 · Mar 5, 2020

Laurelix said:
J7W1 engine

Japanese Secret Projects Experimental Aircraft 1939-1945

Take off: 2130hp
2020hp at 1180m
1160hp* at 8700m

*Maybe a typo meaning to say 1660hp

I have this data for Ha-43/MK9/Ha-211:

Ha-43 model 51 is 2130 hp at 2900 rpm for take off.
At 2800 rpm, 2000 hp at 1800 m, 1800 hp at 5600 m, 1660 hp at 8700 m.

This seems to match your data best apart from possible typos.

Other models only have two usually 2000 m and 8400 m, but model 31 and model 12 have 1200 m and 4800 m. Now I don't know which engine the J7W would go to production with, however as an interceptor I'd want good high altitude performance against the high flying B-29s so I'd go with high altitude version of model 11.

Model 11-ru at 2900 rpm is 2200 hp for take-off. At 10,500 m 1750 hp and at 1000 m 1950 hp. Despite the lower model number I think this is the most advanced engine.

It's all speculation in any case as to what would actually be used in production.
Isn't it?

Aurum · Mar 9, 2020

tomo pauk · Mar 9, 2020

Aurum said:
<snip>

Thank you for the effort. Please, could you replace the words 'stage' with word 'speed' in the last table?

Ha-43 MK9D - J7W1 Engine, pls end my suffering

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