Author Topic: F4U-4 incorrect fuel burn rates  (Read 1078 times)

Offline 214thCavalier

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F4U-4 incorrect fuel burn rates
« on: September 29, 2021, 03:16:30 PM »
Hi,

I have noticed in the F4U-4 that there is an issue with fuel burn.
This was with 100% and a DT not that it changes with other fuel loadouts.

Example at Military power.
GPH = 672
Time remaining 33 mins
Range 110.

And on WEP.
GPH = 564
Time remaining 38 mins
Range 140.


So basically on WEP your GPH reduces, your Time remaining and your range increases.


Offline Lazerr

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Re: F4U-4 incorrect fuel burn rates
« Reply #1 on: September 30, 2021, 10:36:08 AM »
This happens in the M and or N model p47 also.

Offline FLS

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Re: F4U-4 incorrect fuel burn rates
« Reply #2 on: September 30, 2021, 04:03:45 PM »
Hi,

I have noticed in the F4U-4 that there is an issue with fuel burn.
This was with 100% and a DT not that it changes with other fuel loadouts.

Example at Military power.
GPH = 672
Time remaining 33 mins
Range 110.

And on WEP.
GPH = 564
Time remaining 38 mins
Range 140.


So basically on WEP your GPH reduces, your Time remaining and your range increases.

When the WEP is from a water/alcohol injection that is correct. It's not a problem.

Offline TryHard

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Re: F4U-4 incorrect fuel burn rates
« Reply #3 on: October 05, 2021, 07:57:35 PM »
When the WEP is from a water/alcohol injection that is correct. It's not a problem.

When the water/methanol injection correspondingly increases manifold pressure, it is a problem.

If you just injected water/meth with out any increase in boost pressure then the way its modeled in game would be correct. However going from 56" to 72" is a big jump in airflow and thus fuel flow through the engine.

The only piston engine that fuel flow doesn't increase with airflow would be a diesel engine.

Offline hitech

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Re: F4U-4 incorrect fuel burn rates
« Reply #4 on: October 06, 2021, 09:29:29 AM »
When the water/methanol injection correspondingly increases manifold pressure, it is a problem.

If you just injected water/meth with out any increase in boost pressure then the way its modeled in game would be correct. However going from 56" to 72" is a big jump in airflow and thus fuel flow through the engine.

The only piston engine that fuel flow doesn't increase with airflow would be a diesel engine.

It's been a long time since we set the numbers, but I know we looked into this very issue because it also seemed strange to us when we first put the numbers in. If I remember correctly it has to do with being able to run a leaner mixture do to cooling effect of the water.

HiTech