The Buzz-Saw Effect in Modern Turbofan Engines

January, 16, 2022 by

In most modern turbofan engines, at high engine power operating conditions, the fan tip rotation speed will become supersonic. The noise spectrum from a supersonic fan is very different compared to a fan that is rotating subsonically.

Supersonic fans produce a multitude of high-amplitude tones at harmonics of the engine’s shaft rotation frequency. These tones are known commonly as the “buzz-saw” noise.

One generally needs to sit in front of the engines to hear the buzzsaw noise. This is why, on aircraft with fuselage-mounted engines such as the Boeing 717, most passengers can hear the buzzsaw noise generated. However, on aircraft with wing-mounted engines, this “privilege” is usually reserved for those sitting in front of the wings. Similarly, the buzzsaw can be heard by someone standing on the ground as the plane approaches. However, the effect dissipates somewhat after they are left in the plane’s wake.

In Infinite Flight, as noted by Tyler Shelton, a staff member for Infinite Flight, “The buzz is barely detectable from the flight deck in real life as well. With good headphones or at loud volumes you can still hear it faintly from the cockpit on Infinite Flight (as it should be)“.

You may be able to hear the buzz-saw effect in the most recent teaser of the RR RB211 on the newly reworked B757 that is set to be released in the next update, v20.3.

References: Speedbird Spotter, University of Southampton

The Dip

August, 4, 2021 by

From Seth Godin:

Asking the question, the one I get asked the most, “how do I know if it’s a dip or a dead end?” is the wrong question, just as asking, “how do I know if it’s remarkable?” isn’t the key to the Purple Cow. No, the key insight is to ask the question, not to know the answer in advance. Asking yourself, “is this something that will respond to guts, effort and investment?” helps you decide whether or not this is where you can commit. And then, if you do commit, you’re not browsing, you’re in it.

The leader who is struggling with inactivity within their virtual organization. The radar trainee who continues to have terrain separation busts in training. The local trainee who just failed their final IFATC theory attempt. Are you in a dip or at a dead end?

The Dip by Seth, my favorite book of all time, is a book I’d highly recommend anyone read, that you can apply to almost any difficult conflict when you’re at a crossroad. Quick check every once and a while and then you’re off, more focused then ever.

Niner

August, 3, 2021 by

Being on the same page is key in controlling. In Infinite Flight we have the luxury of using text-to-speech. It’s a luxury because not everyone speaks English fluently, and in the real world dialects have to be taken into account. That is why you hear “niner” or “tree” instead of “nine” or “three.

The pronunciation of the digits 3, 4, 5, and 9 differs from standard English – being pronounced tree, fower, fife, and niner. The digit 3 is specified as tree so that it is not pronounced sri; the long pronunciation of 4 (still found in some English dialects) keeps it somewhat distinct from for; 5 is pronounced with a second “f” because the normal pronunciation with a “v” is easily confused with “fire” (a command to shoot); and 9 has an extra syllable to keep it distinct from German nein ‘no’.

The phonetic alphabet is not a random selection of words.

The final choice of code words for the letters of the alphabet and for the digits was made after hundreds of thousands of comprehension tests involving 31 nationalities.

Reference: Wikipedia

AMA with Evan L.

January, 7, 2021 by
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Right now we will be having an AMA “Ask Me Anything with Evan L., a commercial single-engine and multi-engine rated pilot, as well as certificated single-engine, multi-engine, and instrument flight instructor. Here is a message from Evan:

My name is Evan, I’m a 25 year old commercial pilot and flight instructor based in Denver with around 600 hours of flight time. I hold a bachelor’s degree in environmental science and completed my pilot training in the Phoenix area, going from zero experience to being a multi-engine commercial pilot as well as holding all 3 instructor ratings within the span of about 11 months.

Flight simulators are the reason I became what I am today, and I want to be a part in helping other young people realize the tools available to them to potentially realize a dream they had never considered before.

I started this career with the goal of becoming an airline pilot, but through my aviation journey thus far I am now fully pursuing opportunities in the corporate aviation world. Ask me anything about college, flight training, IFR (my favorite!), and come fly with me as UVAL 465.

You can ask a question right now, he’ll be around to answer your questions throughout the day. Leave your questions in the comments below!

Ask a question

AMA with Declan O’Regan

December, 3, 2020 by
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First off, happy 1 year anniversary to our the AMAs. We’ve been able to chat with 27 very cool people. A real-world F-22 Demonstration Team Commander, commerical pilots, CFIs, air traffic controllers, YouTubers, developers, and many more. You can read all of our past AMAs here.

Second, right now we are having an AMA “Ask Me Anything” with Infinite Flight Moderator, IFATC Supervisor, Recruiter, and former Trainer, Declan O’Regan. Here is a message from Declan:

Hello everyone, I’m Declan! I’m 19 years old and an IFC Moderator, Supervisor, Recruiter and former trainer, but besides all of that, I’m an aviation enthusiast just like many, if not all of you. Besides aviation, I’m currently studying Early Childhood Education and Care and love playing tennis in my spare time. I’m also a big movie fan and love the cinema experience and the magic of movies!

You can ask a question right now, Declan will be around to answer your questions throughout the day. He’s an aussie so be mindful, timezones. Leave your questions in the comments below! Subscribe here so you can get notified of future AMAs.

Ask a question

6.9.2 Update regarding GPS Approaches

November, 28, 2020 by

In the most recent update to the ATC Manual, v20.2.2, this section regarding GPS approaches was reworded.

6.9.2 — When a pilot requests the GPS Approach, Controllers must check that the aircraft has a published procedure (i.e. denoted by a prefix in their flight plan – see 6.8.9 above) that provides lateral navigation to the intended arrival runway. Controllers can then expect aircraft to continue on their Flight Plan, and at an appropriate point (such as base), clear the aircraft for the GPS Approach. Vectors, altitude assignments, and/or intercepts should not be required and the pilot is expected to follow their flight plan to the runway threshold.

There was discussion brought up about whether or not the pilot had to have an in-app GPS approach procedure added to their flight plan or if they simply needed the waypoints for a GPS procedure included in their flight plan in order to be able to be cleared for a GPS approach.

This new updated wording clarifies that question people had. If you have any questions about anything in the manual, feel free to message us.

References: 6.9.2 of the ATC Manual

Go higher

November, 24, 2020 by

“Sometimes you have to go up really high to see how small you are.” – Felix Baumgartner

Felix Baumgartner is best known for jumping to Earth from a helium balloon from the stratosphere as part of the Red Bull Stratos project.

How to get ATC operations quickly

November, 23, 2020 by

Just control without checking the number. It’s as simple as that.

The IFATC used to have a leaderboard posted weekly internally within the team that ranked the top 20 controllers based on operations for that week. There was a lot of competition but I was regularly on the top of that leaderboard, controlling a ton, every day. I was consistently in the top 5 every week.

What motivated me wasn’t the leaderboard though, it was the constant feeling that you need to one up yourself and improve.

My secret though to being at the top every week was that I never looked at my total operations number in-app. It sounds silly but you’ll notice if you ignore the number it goes up faster. Try it if you don’t believe me.

There were times where I strayed off that principle of not checking the number. When I did I began to stop focusing only on how I could improve and instead I began to also focus on how I could improve the number. Stop the session, immediately do some math to see how much it went up and compare it to other sessions. It can set you back mentally and demotivate you if you try to do that.

Liftoff, Request Flight Following to Space

November, 22, 2020 by

A rocket ship symbol is placed on a VFR sectional chart representing a “Space Launch Activity Area. Seen here.

The Federal Aviation Administration (FAA) is responsible for ensuring protection of the public, property, and the national security and foreign policy interests of the United States during commercial launch or reentry activities, and to encourage, facilitate, and promote U.S. commercial space transportation. To date, the FAA Office of Commercial Space Transportation (AST) has licensed or permitted more than 370 launches and reentries.

References: FAA, BoldMethod

Congratulations to our new ATC Supervisors

November, 21, 2020 by

Yesterday, the IFATC leadership promoted the following nine controllers to the the ATC Supervisor rank.

  • Drummer
  • Danny M. (ToasterStroodie)
  • Nico (NJ24)
  • Wesley Henrique
  • Adam S.
  • ShaneAviation
  • Jet Airways 995
  • Mauricio B.
  • TaipeiGuru

Other then becoming a moderator, the ATC Supervisor rank is the highest rank one can achieve within the IFATC. The purpose of the Supervisor Team is to assist in the day-to-day operations of IFATC, provide leadership and/or mentoring of individual controllers, monitor controlling quality via the “Check Ride” process, and to moderate the Infinite Flight Expert Server.

It’s is made up of the most experienced and veteran controllers within the team, and these nine individuals are welcome additions. Congratulations to them on their hard work, we’d highly encourage you to join the IFATC if you too would like to try out controlling.