Significant fuel burn discrepancy at FL200-FL240
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@Mad_X Check out item 3 of a write up I've made a few months back.
It's almost identical I believe as yours. But the funny thing is, my fuel used did agree with the tables. Just not the indication. Have a look at item 3 of my post and try to do the same. Doesn't need to be as complex. You can take remaining fuel at the start, then (leaving power constant) take another reading 15 minutes later. That difference in fuel remaining, multiply it by 4 to get your 2-engine fuel burn in pounds/hour. Divide that by 2, and you get the average engine fuel flow. That value should match the fuel flow indicator (and also your tables).
For me, it matched the tables, but not the indicator. As you can see from my post, I didn't hear anything back other than that it should work normally.
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@Black-Square Nick, did you have the chance to look into this? I love the starship and my only gripe is this issues that when trottling back the fuel burn just is really off. Thanks so much
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I'll take a look later. I'll be honest, given the discrepancy is so large, I was hoping you guy would find something on your side that explained it, especially MD82's comments. I'll dig in later.
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I'll take a look later. I'll be honest, given the discrepancy is so large, I was hoping you guy would find something on your side that explained it, especially MD82's comments. I'll dig in later.
I was able to reproduce the issue on my end as well.
FL200
Max Range Power set by FF, torque is too high
Max Range Power set by Torque, FF is too low
FL240
Max Range Power set by FF
The trend continues. I didnt grab an image of the set by torque at FL240 as I had a GFI outlet I had to replace.
Thanks,
Crash -
@Black-Square Did you have time to take a looki Nick?
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@Black-Square just wondering if there was an any update on this one?
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@Black-Square Hey Nick, Will the new PT6 model be implemented for the starship in 2024?
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@Black-Square Hey Nick, hope all is well. Any word on the fuel burn discrepancy?
-Crash -
I just wanted to let you all know that I have made some notes to myself tonight while working on the King Air regarding this. I think I may have found the issue that's causing it. It can be nearly impossible to coax the exact desired engine behavior out of MSFS, even with corrections applied to every parameter in my current engine simulations. This might have been the result of one of those corrections, but it's very careful work to figure out exactly what's going on, and avoid the risk of upsetting every other data point in the performance tables. I'll let you know what I can find, but I make no promises.
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I just wanted to let you all know that I have made some notes to myself tonight while working on the King Air regarding this. I think I may have found the issue that's causing it. It can be nearly impossible to coax the exact desired engine behavior out of MSFS, even with corrections applied to every parameter in my current engine simulations. This might have been the result of one of those corrections, but it's very careful work to figure out exactly what's going on, and avoid the risk of upsetting every other data point in the performance tables. I'll let you know what I can find, but I make no promises.
@Black-Square Have you had a chance to take a look at the recently implemented changes to the turbine engine simulation in SU6? From what I've read so far from other devs it sounds promising:
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I just wanted to let you all know that I have made some notes to myself tonight while working on the King Air regarding this. I think I may have found the issue that's causing it. It can be nearly impossible to coax the exact desired engine behavior out of MSFS, even with corrections applied to every parameter in my current engine simulations. This might have been the result of one of those corrections, but it's very careful work to figure out exactly what's going on, and avoid the risk of upsetting every other data point in the performance tables. I'll let you know what I can find, but I make no promises.
@Black-Square Looking forward to the update!
