120/140 noise levels

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8312
Posts: 3
Joined: Sat Sep 08, 2018 12:39 pm
Name: Thies E
Location: EDLD, Germany
Aircraft Type: C140
Occupation-Interests: Corporate Communication for a living, flying for fun
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120/140 noise levels

Post by 8312 »

Hi everyone,

I fly a 1946 C140 in Germany, where landing fees are the norm, said fees being varying from airfield to airfield but generally are based on MTOW and noise levels. Sometimes, resident aircraft get to pay a bit less, although not at my home field.

As neither the 120 or 140 are listed in the FAA's AC 36-3H (Estimated airplane nosie levels), has anyone here by any chance ever found out/measured/guesstimated or otherwise come across noise levels for a a 120/140 in dB(A) ?
(Mine has a C85 with MacCauley prop)

Cheers; Thies
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6643
Posts: 2415
Joined: Tue May 01, 2018 7:00 am
Name: John C
Location: KLCI, NH
Aircraft Type: 1946 C140/C90
Occupation-Interests: A&P, semi-retired
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Re: 120/140 noise levels

Post by 6643 »

The 1946 models came with straight pipes and they are loud. Probably the best you can do is to put 150 mufflers on it, then I think you could justify using the noise levels for the 150, which I'd expect to be readily available. (55-59 dBA)
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6863
Posts: 139
Joined: Tue May 01, 2018 7:00 am
Name: John Kliewer
Location: EWK Newton, KS
Aircraft Type: C120
Occupation-Interests: Corporate PIlot - retired
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Re: 120/140 noise levels

Post by 6863 »

"The 1946 models came with straight pipes and they are loud." But not as loud as many motorcycles that cruise your and our streets and otherwise silent national parks.
John Kliewer

"Make things as simple as possible but no simpler." Albert Einstiein

"Wheels move the body. Wings move the soul."
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8312
Posts: 3
Joined: Sat Sep 08, 2018 12:39 pm
Name: Thies E
Location: EDLD, Germany
Aircraft Type: C140
Occupation-Interests: Corporate Communication for a living, flying for fun
Contact:
Contact 8312

Re: 120/140 noise levels

Post by 8312 »

Thanks, both Johns.

Valuable advice. And I am just happy when nobody pins the noise from motorcycles cruising their neighbourhood on me as I idle-in for a landing ;)
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luescherni
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Re: 120/140 noise levels

Post by luescherni »

Hi Thies
Eben habe ich deinen Beitrag, beziehungsweise deine Frage gesehen. Bist du in der Zwischenzeit fürnig geworden? Das würde mich noch interessieren...
Beste Grüsse
Nico
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8362
Posts: 58
Joined: Fri Nov 30, 2018 11:50 pm
Name: Matt
Location: 9B8 CT
Aircraft Type: C120
Occupation-Interests: Engineer
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Re: 120/140 noise levels

Post by 8362 »

From google translate, take it with a grain of salt.

Hi Thies
I just saw your post or your question. Have you become affectionate in the meantime? I would still be interested in that...
Best regards
Nico
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