Reduced Thrust take off.
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There’s a BAe-146 take-off performance spreadsheet available at Fs.to which might provide a starting place; expect a fair amount of data input.
When I write starting place, I mean contacting the author and asking nicely for RJ data values for an assumed temperature rather than N1.
An old FS9/FSX takeoff performance calculator called UTOPIA has the RJ85 (but not the RJ70 or RJ100) and this provides an assumed temperature for present conditions and weight.
Amazingly, this still connects to MSFS 2020 and can automatically populate weather and weight data.
Unless you want 20 year old airport data, you’ll need to regenerate and/or reformat the default UTOPIA data table to better reflect the present day - an hour or so with make-runways and Excel should do it.
You could craft new RJ70 & RJ100 data tables based upon the included RJ85 as these are textual in format.
That’s all OK if you’re happy with basic unproven numbers, and so these are listed here as potential starting places.
However, I’m still looking for an old spreadsheet which used to cover the RJ models that was originally found in the QualityWings forum.
Given the state of my memory, this might prove to be an elusive red herring…
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Yes, I'm with you guys, this is definitely something we needs.
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Having just re-opened UTOPIA, it supports the "RJ" as well as the BAe146 100, 200, & 300 variants.
I have found the spreadsheet with RJ support, but then this has a tab for the BAe146-100/RJ70, BAe146/200/RJ85, and BAe146-300/RJ100, so presumably the figures for the equivalent types are still correct.
Anyway, it's a start.BAe146/RJ spreadsheet: https://library.avsim.net/esearch.php?DLID=197048&CatID=genutils
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I have downloaded the doc, but I can't open it, same for you?
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I just get "The file is damaged and cannot be opened".
Maybe because it´s a *.ods file, which Excel 365 doesn´t support.Simbrief has the option to calculate Thrust reduction, but in the current profile for the Avro RJ's, this is not enabled.
EDIT
Here is another link with a *.xlsx file that works for the Bae 146.
https://flightsim.to/file/37415/bae-146-flex-temperature-calculator -
I was hoping being able to use SimBrief's Takeoff Performance calculation, however it always returns
SEL TEMP = NONE.I assume this relates to missing performance data in the aircraft profile. Is this something JustFlight could collaborate on with Navigraph?
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The way I see it is that the product should include such performance data. JustFlight's YouTube tutorial nicely demonstrates how to set the Flex temp, however, without any data source, the feature is useless as one should not just randomly dial in a temp. It is crucial to provide a performance calculator or a document to determine the Flex temp. I hope the manual will be expanded with such performance data or the EFB will feature a Flex temp calculator.
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Airfield performance for an aircraft is a very complex area. The 146/RJ, like all types in Performance Group A, are subject to assessing its take-off/landing ability for a runway against the manufacturers figures for the type. The deduced data (net performance) applies to 1,500 ft above the field and takes into account many, many factors. It’s not actually something a pilot could or would routinely calculate. However, without a chart for each and every runway expected to be the used, an aircraft could not operate. Suppliers of the required charts charge an arm and leg to supply the charts - quite rightly too.
The point is, without the charts (or a very complex computer program) it is impossible to correctly apply the required rules to get an accurate and ‘true to life’ Flex temperature - and the real method to obtain Tflex (contained in the FCOM/Flight Manual) require methodical application.
Have a look at at the FAA rules (UK and EASA rules much the same) https://www.sapoe.org/wp-content/uploads/2013/02/10-ICAO-Friction-Task-Force-and-EASA-Rulemaking-Task-Force.pdf. Those rules are then applied to the Flight Manual data - it’s a very complex area.
I think assuming that it’s JF’s responsibility is unfair.
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I would've made one if I had the data, but I only have low res charts for the RJ85. It could theoretically be done, but because of the poor image quality, it would be incredibly time consuming and it would only feature the RJ85.
I am a programmer and if I was provided with good data, I could make a TKOF/LDG performance calculator.
That's a big "if" though as it is unlikely that I'll ever get that data. -
I assume (assumption is the mother of all f-ups as we know) Justflight has access to such data as they surely had access to many other details related to the simulation. It would be awesome if you guys could somehow co-operate on this. Those serious about flight simmig as a hobby understand the importance of a takeoff performance calculator. We have the FLEX feature implemented which is awesome but right now we cannot safely and reliably use it, we are limited to guesswork, which in aviation can be lethal. Also, these days a tool like a takeoff performance calculator (or at least a data sheet of some sort) would be reasonably expected from a Professional product. If an aircraft in normal line operations regularly use the FLEX feature then it is fair to expect a tool that helps calculate these figures. Either something in the tablet as is the case with most 3rd party aircraft addons, or alternatively, as an external app or even a PDF document with the data to calculate the flex temps. Without something to aid the armchair pilot, the only safe way is to always perform max power takeoffs.
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My hand is out to anyone willing to give me the data and I would even do it for free out of love for this aircraft.
However, knowing how companies work in general, saying those words sadly isn't enough.
