Reduced Thrust take off.
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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. -
The problem with sharing proprietary information is that the copyright owner may take exception to someone doing so. I wouldn’t want to use a large chunk of my BAe Systems pension on fighting legal action against me.
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The problem with sharing proprietary information is that the copyright owner may take exception to someone doing so. I wouldn’t want to use a large chunk of my BAe Systems pension on fighting legal action against me.
@Paul-Cairns Exactly.
Kind of sad that the world works like this given that an uncertified tool for take-off and landing performance for a product that is dead wouldn't be a competitor to anyone.
There would be no financial loss for anybody, but the companies are so wrapped up in red tape that harmless projects like this are impossible. -
@Paul-Cairns Exactly.
Kind of sad that the world works like this given that an uncertified tool for take-off and landing performance for a product that is dead wouldn't be a competitor to anyone.
There would be no financial loss for anybody, but the companies are so wrapped up in red tape that harmless projects like this are impossible.@smashingjonor well said, couldn't agree more. In the end, without a way to calculate Flex temp, the feature is useless, might as well be inoperative. Sad.
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I created the following spreadsheet specifically for the 146, then modified it for the RJ series. The only BAe data I could find for flex was for the 502 engines in the 146, so if anyone has updated settings for the 507 series engines I would be happy to adjust the figures.
You can download the spreadsheet from Flightsim.to. It will only work with Libre office, which is also a free download. Any comments or suggestions for improvements would be appreciated.https://flightsim.to/file/24722/aircraft-runway-performance-spreadsheet
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I created the following spreadsheet specifically for the 146, then modified it for the RJ series. The only BAe data I could find for flex was for the 502 engines in the 146, so if anyone has updated settings for the 507 series engines I would be happy to adjust the figures.
You can download the spreadsheet from Flightsim.to. It will only work with Libre office, which is also a free download. Any comments or suggestions for improvements would be appreciated.https://flightsim.to/file/24722/aircraft-runway-performance-spreadsheet
@galeair Just as an FYI if you'd like to include the LF 507 data in your spreadsheet, I have included them in my checklist (it's not currently live at time of posting but should be within 12hrs).