11 Jun 2025, 08:05 [ UTC - 5; DST ]
|
Username Protected
|
Post subject: Re: Wow! MU-2 ground noise is insane Posted: 30 Apr 2015, 20:41 |
|
 |

|
|
Joined: 08/18/13 Posts: 1152 Post Likes: +769
Aircraft: 737
|
|
Heheheheheheh...
Every time I roll up and see all of you with your fingers in your ears I can almost hear myself laughing over the noise...
Almost.
Actually, it's surprisingly very quiet in the cabin.
|
|
Top |
|
Username Protected
|
Post subject: Re: Wow! MU-2 ground noise is insane Posted: 30 Apr 2015, 21:57 |
|
 |

|
|
 |
Joined: 11/09/09 Posts: 3235 Post Likes: +4423 Location: KHII & KREI
Aircraft: RV6A, C182M
|
|
Username Protected wrote: I have read on here about how loud the MU-2 is but have never been close to one. Today at KTPL in Temple, TX one taxied up next to me as I was climbing in my helo. I always leave my door open and helmet off while I start the engine. During his cool down it was deafening and once he pulled it to fuel cut off it seemed to get even louder for a second or two.
Makes a King Air sound like Blue Thunder in whisper mode. Even made my startup sound pretty lame. Apparently you've never been around a Rockwell 681 Commander either. Dave
|
|
Top |
|
Username Protected
|
Post subject: Re: Wow! MU-2 ground noise is insane Posted: 30 Apr 2015, 22:46 |
|
 |

|
|
Joined: 12/03/14 Posts: 20314 Post Likes: +25452 Company: Ciholas, Inc Location: KEHR
Aircraft: C560V
|
|
Username Protected wrote: It's actually a feature - no conscious person walks into the props ! I wish. 4 fatal accidents from folks walking into props in MU2s. I know of at least one non fatal prop contact. A high wing airplane is more susceptible to this. My theory is that the MU2 is loud on the ground due to some sort of underwing resonance with the short engine exhaust. Other TPE331 airplanes have longer exhaust (Commanders, B100) or longer tail pies with overwing exhaust (Merlin, Conquest). Once the prop develops thrust, that isolates the exhaust inside the prop wash and it gets much quieter after that. So in the air, the MU2 is no worse than any other typical turboprop and better than some (way better than Piaggio). Mike C.
_________________ Email mikec (at) ciholas.com
|
|
Top |
|
Username Protected
|
Post subject: Re: Wow! MU-2 ground noise is insane Posted: 01 May 2015, 08:04 |
|
 |

|
|
 |
Joined: 08/09/11 Posts: 1956 Post Likes: +2633 Company: Naples Jet Center Location: KAPF KPIA
Aircraft: EMB500 AC95 AEST
|
|
Username Protected wrote: We have regular MU-2 traffic. Reece Howell, MU-2 recurrent instructor brings his pilots to our field for practice and re-fueling. They have become a real nuisance. The noise is deafening. They are louder than the Lear 35 without hush kit also based on field. Agreed at idle they are loud but as soon as they are pulling air into themselves, they are not. From an airport noise standpoint, they are quieter than the old stage III jets like a Lear 35.
|
|
Top |
|
Username Protected
|
Post subject: Re: Wow! MU-2 ground noise is insane Posted: 01 May 2015, 09:33 |
|
 |

|
|
Joined: 12/03/14 Posts: 20314 Post Likes: +25452 Company: Ciholas, Inc Location: KEHR
Aircraft: C560V
|
|
Username Protected wrote: We have regular MU-2 traffic. They have become a real nuisance. According to the FAA, a B55 Baron is louder than the MU2 when it comes to overfly noise. http://www.faa.gov/documentLibrary/medi ... 036-1H.pdfThe objectionable noise is taxiing on the airport. It is loud, but not really THAT loud. This video captures the difference between flight and taxi noise: https://www.youtube.com/watch?v=ihUXDW2Uy0sOnce you go to zero or near zero thrust and taxi RPMs, the MU2 develops a characteristic howl. The exhaust is no longer surrounded and isolated by prop airflow. I wondered if making a new tailpipe with serrated trailing edge would reduce this noise. The theory is the howling is a resonance from the tailpipe length (much like a wind instrument) and by having a serrated trailing edge, it would detune the resonance. Kind of like this:  Mike C.
_________________ Email mikec (at) ciholas.com
|
|
Top |
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum
|
Terms of Service | Forum FAQ | Contact Us
BeechTalk, LLC is the quintessential Beechcraft Owners & Pilots Group providing a
forum for the discussion of technical, practical, and entertaining issues relating to all Beech aircraft. These include
the Bonanza (both V-tail and straight-tail models), Baron, Debonair, Duke, Twin Bonanza, King Air, Sierra, Skipper, Sport, Sundowner,
Musketeer, Travel Air, Starship, Queen Air, BeechJet, and Premier lines of airplanes, turboprops, and turbojets.
BeechTalk, LLC is not affiliated or endorsed by the Beechcraft Corporation, its subsidiaries, or affiliates.
Beechcraft™, King Air™, and Travel Air™ are the registered trademarks of the Beechcraft Corporation.
Copyright© BeechTalk, LLC 2007-2025
|
|
|
|