jsharr ★ Posted April 11, 2018 Share #1 Posted April 11, 2018 My office tower is close to and in line with the runway at Addison Airport. Lots of planes go overhead every day. I seldom notice the noise except for a twin engine turbo prop pusher. Probably a Piaggio 180. Maybe even this one. Anyway, why are pusher prop planes so much noisier than conventional prop forward planes? Link to comment Share on other sites More sharing options...
Kzoo Posted April 11, 2018 Share #2 Posted April 11, 2018 Doppler effect. Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted April 11, 2018 Share #3 Posted April 11, 2018 God damn, the pusherGod damn, I say the pusherI said God damn, God damn the pusher man 3 1 Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 11, 2018 Author Share #4 Posted April 11, 2018 1 minute ago, maddmaxx said: God damn, the pusherGod damn, I say the pusherI said God damn, God damn the pusher man they are not that noisy. sheesh. Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 18, 2018 Author Share #5 Posted April 18, 2018 The damn pusher just flew over again. Sounds like a herd of hornets on riding mowers on speed. @Wilbur please tell me why. Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 18, 2018 Author Share #6 Posted April 18, 2018 looked at flightaware and it shows this bird just landed there. N184LW a 2009 Piaggio P180 Link to comment Share on other sites More sharing options...
late Posted April 18, 2018 Share #7 Posted April 18, 2018 Prob the wing is deflecting a lot of the noise, on a regular turboprop. 1 Link to comment Share on other sites More sharing options...
Longjohn ★ Posted April 18, 2018 Share #8 Posted April 18, 2018 Sometimes they just have a lot to talk about. 1 Link to comment Share on other sites More sharing options...
F_in Ray Of Sunshine Posted April 18, 2018 Share #9 Posted April 18, 2018 On 4/11/2018 at 10:27 AM, jsharr said: why are pusher prop planes so much noisier than conventional prop forward planes? To piss you off 1 2 Link to comment Share on other sites More sharing options...
Kzoo Posted April 18, 2018 Share #10 Posted April 18, 2018 "Most pushers I have seen use a high speed motor and a small diameter prop. That combination makes a high frequency noise." Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 18, 2018 Author Share #11 Posted April 18, 2018 Just now, Kzoo said: "Most pushers I have seen use a high speed motor and a small diameter prop. That combination makes a high frequency noise." Thanks. Screw You @Wilbur!! I know who my friend is. @Kzoo Link to comment Share on other sites More sharing options...
Kzoo Posted April 18, 2018 Share #12 Posted April 18, 2018 Just now, jsharr said: Thanks. Screw You @Wilbur!! I know who my friend is. @Kzoo Hey, I swiped this from an RC forum. I have no idea as to it's application to big boy planes. Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 18, 2018 Author Share #13 Posted April 18, 2018 Just now, Kzoo said: Hey, I swiped this from an RC forum. I have no idea as to it's application to big boy planes. And humble too! @Wilburcould learn much from you 1 Link to comment Share on other sites More sharing options...
Wilbur ★ Posted April 18, 2018 Share #14 Posted April 18, 2018 1 minute ago, jsharr said: And humble too! @Wilburcould learn much from you 2 minutes ago, Kzoo said: Hey, I swiped this from an RC forum. I have no idea as to it's application to big boy planes. No, but it is an answer. Link to comment Share on other sites More sharing options...
Scrapr ★ Posted April 18, 2018 Share #15 Posted April 18, 2018 1 hour ago, jsharr said: looked at flightaware and it shows this bird just landed there. N184LW a 2009 Piaggio P180 That is an ugly plane. I hope that Wilbur doesn't ever have to fly that pig. Link to comment Share on other sites More sharing options...
Wilbur ★ Posted April 18, 2018 Share #16 Posted April 18, 2018 It is caused by square wave noise which is caused by exhaust hitting the props. 1 Link to comment Share on other sites More sharing options...
Wilbur ★ Posted April 18, 2018 Share #17 Posted April 18, 2018 5 minutes ago, Scrapr said: That is an ugly plane. I hope that Wilbur doesn't ever have to fly that pig. I looked at buying one for a vacation rig. They are fast and cheap to operate. They are ugly though. Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 18, 2018 Author Share #18 Posted April 18, 2018 5 minutes ago, Wilbur said: It is caused by square wave noise which is caused by exhaust hitting the props. I wondered about that in actuality when I looked at the top image of the one with the red stripe. Big honking turbo exhaust right in front of the prop. So do they change the pitch of the prop when landing? I am at 635 and the tollway on the final approach to KADS, 2.6 miles from the end of the runway. Link to comment Share on other sites More sharing options...
Wilbur ★ Posted April 18, 2018 Share #19 Posted April 18, 2018 3 minutes ago, jsharr said: I wondered about that in actuality when I looked at the top image of the one with the red stripe. Big honking turbo exhaust right in front of the prop. So do they change the pitch of the prop when landing? I am at 635 and the tollway on the final approach to KADS, 2.6 miles from the end of the runway. Yes they do. From coarse to fine pitch in case of a missed approach. Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 18, 2018 Author Share #20 Posted April 18, 2018 19 minutes ago, Wilbur said: It is caused by square wave noise which is caused by exhaust hitting the props. 4 minutes ago, Wilbur said: Yes they do. From coarse to fine pitch in case of a missed approach. See @Kzoo this is the kind of answer I was looking for, not some cut and paste crap from a toy website. I knew I could count on my friend @Wilbur Link to comment Share on other sites More sharing options...
Wilbur ★ Posted April 18, 2018 Share #21 Posted April 18, 2018 2 minutes ago, jsharr said: See @Kzoo this is the kind of answer I was looking for, not some cut and paste crap from a toy website. I knew I could count on my friend @Wilbur Kazoo is an idiot savant. Minus the savant part.. Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 18, 2018 Author Share #22 Posted April 18, 2018 1 minute ago, Wilbur said: Kazoo is an idiot savant. Minus the savant part.. Explains why he and I seem so alike. Link to comment Share on other sites More sharing options...
Kzoo Posted April 18, 2018 Share #23 Posted April 18, 2018 56 minutes ago, jsharr said: See @Kzoo this is the kind of answer I was looking for, not some cut and paste crap from a toy website. I knew I could count on my friend @Wilbur Listen I was doing this for you. I was not about to put a lot of research into it - you understand. I did a cut an paste on the first Google thing I could find. It was more a case of wanting to shut you up than getting you an accurate answer. I can tell my attempt at shutting you up failed. You are welcome. 1 Link to comment Share on other sites More sharing options...
Dottleshead ★ Posted April 18, 2018 Share #24 Posted April 18, 2018 Wait. Wut? The drug pushers in Texas are noisy? Are they stupid? Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 18, 2018 Author Share #25 Posted April 18, 2018 1 minute ago, dotman17 said: Wait. Wut? The drug pushers in Texas are noisy? Are they stupid? Yes. Link to comment Share on other sites More sharing options...
jsharr ★ Posted April 18, 2018 Author Share #26 Posted April 18, 2018 28 minutes ago, Kzoo said: Listen I was doing this for you. I was not about to put a lot of research into it - you understand. I did a cut an paste on the first Google thing I could find. It was more a case of wanting to shut you up than getting you an accurate answer. I can tell my attempt at shutting you up failed. You are welcome. 1 Link to comment Share on other sites More sharing options...
MickinMD ★ Posted April 18, 2018 Share #27 Posted April 18, 2018 Maybe it's just as noisy as planes with props the other way, but it may be that in both cases, the body and wings minimize the noise when they are between you and the propeller. So if it's a pusher, you don't notice the noise until you see the plane and it gets noisier as it passes. In the opposite configuration, you may not associate the noise with the plane because you don't see it when it is noisiest - it's behind you. Then, as it passes, you see the plane but the body and wings are helping with interference and you associate the plane with being quieter. Additionally, the Doppler Effect would mean the pusher would be noisier as passes and the frequency is dropping to a lower pitch that penetrates walls, etc. more easily. But the front-facing propeller would be noiser approaching, hitting you with a higher, less penetrating frequency. How's that for a lot of pseudo-scientific b.s.? Link to comment Share on other sites More sharing options...
Further Posted April 18, 2018 Share #28 Posted April 18, 2018 An airboat was the noisiest thing I ever rode in. Pusher prop & open headers a lot of noise make. 1 Link to comment Share on other sites More sharing options...
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