---------------------------------------------------------- Tailwind-List Digest Archive --- Total Messages Posted Thu 05/06/04: 5 ---------------------------------------------------------- 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 _____________________________________ Time: 06:22:27 AM PST US From: "DaveM" "Tailwind list" 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 2 _____________________________________ Time: 07:13:07 AM PST US From: "Louis Owen" Subject: Re: Tailwind-List: Cabin noise 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 _____________________________________ Time: 07:13:55 AM PST US Subject: RE: Tailwind-List: Cabin noise From: "Ruhnke, Mike" 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 _____________________________________ Time: 08:12:54 PM PST US Subject: Re: Tailwind-List: Cabin noise From: Dave Conrad 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 _____________________________________ Time: 09:37:34 PM PST US From: "red" Subject: Re: Tailwind-List: Cabin noise 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