Today's Message Index:
----------------------
1. 06:22 AM - Cabin noise (DaveM)
2. 07:13 AM - Re: Cabin noise (Louis Owen)
3. 07:13 AM - Re: Cabin noise (Ruhnke, Mike)
4. 08:12 PM - Re: Cabin noise (Dave Conrad)
5. 09:37 PM - Re: Cabin noise (red)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
"Tailwind list" <tailwind-list@matronics.com>
I visited Red Hamilton at Ft. Bragg, and we got to talking about noise levels in
the Tailwind. He has been taking readings in his new one, and adding some sound
deadening material. He loaned me his sound meter, and I took the following
readings in N168A (Clement trike) on the way back to Yolo County. Thought
the group might be interested.
Here are the results:
DB Taxi Runup Climb Cruise (2500) Slo Cruise
(2000)
Ear level 94 104 106 104-6
94
Windshield 93 105 108 109-114
95
Lap level 90 104 107 106
94
As you can see, the levels are fairly high, no matter where in the cabin it is
measured. I think the meter is set to average sound intensity over a short (1
sec or so) interval.
Dave
N202Q
N168A
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
These figures compare favorably with what I got in N6PJ abour 20 years ago. For
fun see what the readings are with closed throttle in a dive to cruise speed.
Let us know what the readings are.
Lou
Former N6PJ
----- Original Message -----
From: DaveM
To: TailwindForum@yahoogroups.com ; Tailwind list
Sent: Thursday, May 06, 2004 8:19 AM
Subject: Tailwind-List: Cabin noise
I visited Red Hamilton at Ft. Bragg, and we got to talking about noise levels
in the Tailwind. He has been taking readings in his new one, and adding some
sound deadening material. He loaned me his sound meter, and I took the following
readings in N168A (Clement trike) on the way back to Yolo County. Thought
the group might be interested.
Here are the results:
DB Taxi Runup Climb Cruise (2500) Slo
Cruise (2000)
Ear level 94 104 106 104-6
94
Windshield 93 105 108 109-114
95
Lap level 90 104 107 106
94
As you can see, the levels are fairly high, no matter where in the cabin it is
measured. I think the meter is set to average sound intensity over a short
(1 sec or so) interval.
Dave
N202Q
N168A
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Great data!
Do Not Archive
-----Original Message-----
From: owner-tailwind-list-server@matronics.com [mailto:owner-tailwind-list-server@matronics.com]On Behalf Of DaveM
Subject: Tailwind-List: Cabin noise
I visited Red Hamilton at Ft. Bragg, and we got to talking about noise levels in
the Tailwind. He has been taking readings in his new one, and adding some sound
deadening material. He loaned me his sound meter, and I took the following
readings in N168A (Clement trike) on the way back to Yolo County. Thought
the group might be interested.
Here are the results:
DB Taxi Runup Climb Cruise (2500) Slo Cruise
(2000)
Ear level 94 104 106 104-6
94
Windshield 93 105 108 109-114
95
Lap level 90 104 107 106
94
As you can see, the levels are fairly high, no matter where in the cabin it is
measured. I think the meter is set to average sound intensity over a short (1
sec or so) interval.
Dave
N202Q
N168A
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
It would be interesting to know what the same meter would read in a
Cessna 172 or warrior. Dave Conrad
On Thursday, May 6, 2004, at 08:19 AM, DaveM wrote:
> I visited Red Hamilton at Ft. Bragg, and we got to talking about noise
> levels in the Tailwind.=A0 He has been taking readings in his new one,
> and adding some sound deadening material.=A0 He loaned me his sound
> meter, and I took the following readings in N168A (Clement trike) on
> the way back to Yolo County.=A0 Thought the group might be interested.
>
> Here are the results:
>
> DB=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Taxi=A0=A0=A0=A0=A0 Runup=A0=A0=A0=A0=A0
Climb=A0=A0=A0=A0=A0=A0=A0Cruise
> (2500)=A0=A0=A0=A0 Slo Cruise (2000)
> Ear level=A0=A0=A0=A0=A0 94=A0=A0=A0=A0=A0=A0=A0 104=A0=A0=A0=A0=A0=A0=A0 106=A0=A0=A0=A0=A0=A0=A0
> 104-6=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 94
> Windshield=A0=A0=A0 93=A0=A0=A0=A0=A0=A0=A0 105=A0=A0=A0=A0=A0=A0=A0 108=A0=A0=A0=A0=A0=A0=A0
> 109-114=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 95
> Lap level=A0=A0=A0=A0=A0 90=A0=A0=A0=A0=A0=A0=A0 104=A0=A0=A0=A0=A0=A0=A0 107=A0=A0=A0=A0=A0=A0=A0
106=A0=A0=A0
>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 94
>
> As you can see, the levels are fairly high, no matter where in the
> cabin it is measured.=A0 I think the meter is set to average sound
> intensity over a short (1 sec or so) interval.
> Dave
> N202Q
> N168A
>
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
I've got some:
O320 W-10 with 8lbs of sound barrier and absorber; and upholstery
dB taxi climb 2500 cruise 2000cruise
Ear level 92 108 108 102
Windshield 93
Lap 87
I have since changed mufflers and gotten about 2 dB less in cruise. I want to try
the dive to 250 with closed throttle and see what that noise level is, as suggested.
that would tend to isolate wind noise from engine noise. For the record,
same meter, same w10, before any door seals or sound deadening, but with
upholstery, 117 at high cruise! say what?
Cessna 180, not generally thought of as a quiet a/c,1953 with O470U, Beech mufflers,
no sound deadening on firewall,standard windshield and side windows, same
categories, same meter
86 102 98 94
Red Hamilton
374WT
----- Original Message -----
From: Dave Conrad
To: tailwind-list@matronics.com
Sent: Thursday, May 06, 2004 8:11 PM
Subject: Re: Tailwind-List: Cabin noise
It would be interesting to know what the same meter would read in a Cessna 172
or warrior. Dave Conrad
On Thursday, May 6, 2004, at 08:19 AM, DaveM wrote:
I visited Red Hamilton at Ft. Bragg, and we got to talking about noise levels
in the Tailwind. He has been taking readings in his new one, and adding some
sound deadening material. He loaned me his sound meter, and I took the following
readings in N168A (Clement trike) on the way back to Yolo County. Thought
the group might be interested.
Here are the results:
DB Taxi Runup Climb Cruise (2500) Slo
Cruise (2000)
Ear level 94 104 106 104-6
94
Windshield 93 105 108 109-114
95
Lap level 90 104 107 106
94
As you can see, the levels are fairly high, no matter where in the cabin it
is measured. I think the meter is set to average sound intensity over a short
(1 sec or so) interval.
Dave
N202Q
N168A
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|