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Ki-84 ko incorrect climb and stall speed


1- Ki-84 ko has incorrect climb speed and stall speed. It's in game performance is superior to the reality.

2- Ki-84 ko

3- Simulator Battle

4- 10000ft climb time should be increased from 2.2 minutes to 2.6 minutes, 20000ft climb time should be increased from 5.2 minutes to 5.8 minutes. 

Power Off - Wheels and flaps up stall speed should be increased from 95 mph to 108 mph, Power Off - Wheels and flaps down stall speed should be increased from "No stall" to 90 mph, Power On - Wheels and flaps down stall speed should be increased from "No stall" to 74 mph.

5- No screen shots or replay due to bug being FM and plane performance

6- 2020_08_02_09_52_36__4152.clog

7- DxDiag.txt
 

8- Sources: 
http://www.wwiiaircraftperformance.org/japan/Ki-84-156A.pdf
http://www.wwiiaircraftperformance.org/japan/Ki-84-TSFTE-2001.pdf
http://www.wwiiaircraftperformance.org/japan/T-2_Report_on_Frank_I_Ki-84.pdf
http://www.wwiiaircraftperformance.org/japan/K-84_MATSC.pdf

 

In game source:

 

Climb Performance

 

Climb performance in reality:

image.png.ea0a583c577357b6342bc6477cda81

image.thumb.png.3fbcaa23dfbb5f2a36eb3a09

image.png.71322cea53b7f583330470da6183ee

image.png.ba1578408f934de77b5b611f93f0f3

 

In game performance:

image.png.8ddf237f2df00b94fe7ea8b256fff1

 

 

According to the official figures Ki-84 ko aka Frank I, with 7940 lb weight, 1110lb fuel, gears and flaps closed, cowl closed should climb to:

10000ft at 2.6 min

20000ft at 5.8 min

 

According to my test and in game datasheet in SB, with full fuel 3600kg (7937lb), flaps and gear closed, cowl closed, %100 propeller pitch, in game performance is as following;

mph, ias, ft, had been used during the test.

 

to 10000ft from 0ft  at 2.2 min

to 20000ft from 0ft  at 5.2 min

 

Conclusion: In game performance of the Ki-84 ko is approx. 20-40 seconds better than reality.

 

Stall Performance

 

Official Figures: 

image.png.bb11f428a80e4048cbc2f857cba9b4

image.png.05001f80ae62a8ea40fe67bcbbda52

 

In game Stall Speed Performance:

image.png.8297f9a4a86d3a7099484ea6c740fc

 

In game datasheet does not reflect the in game performance.

With 3600kg, (7940lb) weight, cowl and canopy closed, %100 propeller pitch at 8.000ft in SB test the performance is as follows:

 

mph, ias, ft, had been used during the test.

 

Power Off - Wheel and flaps up: Stall speed at 95 mph
Power Off - Wheel and flaps down: No stall
Power On- Wheel and flaps down: No stall

 

Conclusion: The in game stall speed performance is superior to the reality and needs improvements as such: 

 

Power Off - Wheel and flaps up: stall speed should be increased from 95 mph to 108 mph

Power Off - Wheel and flaps down: No stall speed should be increased to 90 mph

Power On- Wheel and flaps down: No stall speed should be increased to "Rudder inadequate at 81 mph, Aileron inadequate at 74 mph, aircraft should start to yaw left and roll left at 74 mph, wing drop at 79 mph.

 

Comment: In game stall performance is kinda UFO-ish it does not stall as it supposed to be, handling and control is superior. Pretty much impossible to stall this plane unlike to the reality.

 

 

Addition:

image.png.9326ca2bde57c1778d111fe4c54e05

 

In game performance of the aircraft can exceed 520 mph ias from 10.000 feet dive.

There is no stiffing above 300 mph, furthermore there is no stiffing at all up to 520 mph or until its wing-rip speed and full elevator pull can be performed at 9-10G 

 

External video: https://streamable.com/d2jqcm

Edited by AdelWolf
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  • 2 weeks later...
On 02/08/2020 at 16:22, AdelWolf said:

Climb Performance

Spoiler


Climb performance in reality:

image.png.ea0a583c577357b6342bc6477cda81

image.thumb.png.3fbcaa23dfbb5f2a36eb3a09

image.png.71322cea53b7f583330470da6183ee

image.png.ba1578408f934de77b5b611f93f0f3

In game performance:

image.png.8ddf237f2df00b94fe7ea8b256fff1

 

 

Hi.

 

2.6 min refers to military. Maximum power is not emergency power. The graph showing a time to 10k in 2.6min (~2 min and 36 secs) and 20k in 5.8 (~5 min 48 secs) is explicitly saying "all military" and not War emergency.

You are showing datasheet wavlue for WEP. It is expected from WEP to exceed 100% performance

 

Time to 10k ft at 100% (military) is curerently 2:31 (~2.5) and 5:44 (~5.7).

This is within tolerances.

 

On 02/08/2020 at 16:22, AdelWolf said:

Stall Performance

In game Stall Speed Performance:

image.png.8297f9a4a86d3a7099484ea6c740fc

 

In game datasheet does not reflect the in game performance.

With 3600kg, (7940lb) weight, cowl and canopy closed, %100 propeller pitch at 8.000ft in SB test the performance is as follows:

 

mph, ias, ft, had been used during the test.

 

Power Off - Wheel and flaps up: Stall speed at 95 mph
Power Off - Wheel and flaps down: No stall
Power On- Wheel and flaps down: No stall

 

Conclusion: The in game stall speed performance is superior to the reality and needs improvements as such: 

Current FM stalls at 102/90 which matches your sources, given that we don't have any information on the PEC, in any document at hand.

 

Documents mentions that stall is symmetrical / gently, and the aircraft remains controllable. Below the aforementioned speed, the aircraft, while controllable, is in stall condition (lift reduced, drag increased) compared to max AoA. It doesn't spin / snap, but that is mentioned by the document.

 

On 02/08/2020 at 16:22, AdelWolf said:

Addition:

A Japanese document puts the Ki-84 to 790kmh as VNE. Slightly lower speed for US testing is assumed as for maintenance / preservation reason.

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