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Simbol avatar image
Simbol asked FlyingRaccoon commented

TurboProp density_on_torque_table

Dear Asobo,

Can I get clarification on the density_on_torque_table I am trying to match my turbo engine to the POH of the real aircraft, which has the following tables for performance:

1656931740756.png


The max torque is 1313 on this engine, I have configured the engine max torque correctly, the n1_to_shaft_torque_table, etc.

But my question is, are the values on the density_on_troque_table are as per ISA 0? I get confused because the weather dialog in MSFS says ISA +10.

So what's the best way to tweak this and test it via the engine Debug window?

Best,
Raul

aircraft
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2 Answers

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FlyingRaccoon avatar image
FlyingRaccoon answered FlyingRaccoon commented

Hello @Simbol

My bad, I thought the relationship between temperature, pressure and density was more straightforward.
I got some feedback from our plane developers about this. They use the ISA table whenever possible and configure the weather panel to match ISA condition as well (default clear skies condition i think).
The weather panel showing ISA+10 is a mistake. When you're at sea level with 15°C and 1013.25 hPa, you are in ISA condition.

Regards,
Sylvain

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Simbol avatar image Simbol ·
Right thank you!. this is what was confusing me, ISA 10+ on the weather panel was driving my brain into high-wire haha.


Thanks for clarifying, will you guys update the weather panel in the future to say ISA (no +10)? the reality is, we are then setting the ISA temp, no the ISA +10 temp.. so it should reflect the correct data there :).

Best,
Raul

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FlyingRaccoon avatar image FlyingRaccoon ♦♦ Simbol ·
Yes, the weather panel will be fixed.
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FlyingRaccoon avatar image
FlyingRaccoon answered Simbol commented

Hello @Simbol

Maybe I'm missing something but I don't see how this table relates to ISA condition.
You're asked to provide a pressure and torque multiplier. If your POH provides you with altitude values at ISA 0, you take the corresponding pressure.
In game, whether you're in ISA 0 or ISA +10 condition, the table will be used the same way, using the current pressure to fetch the multiplier in the table.

Regards,
Sylvain

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Simbol avatar image Simbol ·
Hi Sylvain,


That is the ISA 0 performance table on torque and fuel flow, so basically I can create the multiplier density table based on that, my question was if we use ISA 0 or ISA 10+ tables given the weather user interface always says ISA 10+? that's my confusion.

I added the multiplier based on that table and things started to work at the end, so I imagine we use ISA 0 information then?

Best,
Raul

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FlyingRaccoon avatar image FlyingRaccoon ♦♦ Simbol ·
You mean you have two different tables in your POH, that give a different torque for the same air density?
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Simbol avatar image Simbol FlyingRaccoon ♦♦ ·
They have tables for ISA 0 with the temps, and they have tables for ISA +10, +15, +20, etc.. Same on the negative range.


Piper POH are very specific, yea.


But my theory is, for Msfs ISA 0 is all that is required, right?

R.

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