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DA-50 noise restrictions?

Old 09-30-2005, 11:41 AM
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exeter_acres
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Default DA-50 noise restrictions?

Well... going to be jumping into a 50cc plane with a DA-50....

trying to decide on pitts or tuned pipe...

The pipe would be nice for the quiet and the performance...
but the Pitts is in my budget.....

but the question is...

Is there anywhere that a DA-50 with a standard DA pitts muffler would be violating any noise requirements??

Thanks
Exeter
Old 10-03-2005, 07:11 AM
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Default RE: DA-50 noise restrictions?

Anyone??
Old 10-03-2005, 08:25 AM
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Chris Moon
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Default RE: DA-50 noise restrictions?

I can only offer observations, since I don't have a DA50. The DA50s that I have seen are pretty loud w/ a Pitts muffler. I have a BME50 w/ Pitts muffler, and I think it too is pretty loud. The Pitts mufflers also sound rather "harsh". I also have a 3W-75 w/ a canister muffler that I have a hard time hearing when someone else is flying their .40 size trainer. The pipe would be much better sound wise than the Pitts, but the Pitts is probably still "legal" -just much louder than your other options.
Old 10-03-2005, 08:42 AM
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Default RE: DA-50 noise restrictions?

Hmmm...I've sent an email to Imac too.....

looking at a pipe, but that is almost $200 versus the Pitts

appreciate the input.....
Old 10-03-2005, 06:00 PM
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shoey721
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Default RE: DA-50 noise restrictions?

We use a stock muffler on our DA-50. We did the sound check per the AMA regulations and are A-OK.
Old 10-03-2005, 06:10 PM
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Laserdude
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Default RE: DA-50 noise restrictions?


ORIGINAL: shoey721

We use a stock muffler on our DA-50. We did the sound check per the AMA regulations and are A-OK.
With what prop?

Thanks, Ron

Old 10-04-2005, 08:10 PM
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Default RE: DA-50 noise restrictions?

We use a carbon fiber 23-8.
Old 10-04-2005, 09:44 PM
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Default RE: DA-50 noise restrictions?


ORIGINAL: shoey721

We use a carbon fiber 23-8.
Thanks
Old 10-22-2005, 09:35 PM
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al
 
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Default RE: DA-50 noise restrictions?

We have several mufflers for the DA 50. we have a compact Pitts and our quiet Pitts. The Quiet pitts has been independently tested at 95 db at 9 feet and 94 db at 9.8 feet. I do not know what prop was used when tested. cost is $89.99 and $139.99 plus shipping

Al Young
JTEC/RADIOWAVE
www.jtecrc.com
[email protected]
Old 11-10-2005, 04:49 AM
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Buzz Lightyear
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Default RE: DA-50 noise restrictions?

Guys

Noise test result done today with a brand new calibrated noise meter.

C-ARF Extra 2x2 with DA50 and KS1060 swinging a 2 blade Mejzlik 22x12 at 6400rpm.

First test 94.9db at 3m on grass with aluminium spinner
Second test 90.9db at 3m on grass without aluminium spinner!!!

Each test was done 3 times cause I couldn't believe my eyes. I was told that an aluminium spinner made a lot of noise but.......

Cheers

Buzz
Old 11-10-2005, 08:05 AM
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exeter_acres
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Default RE: DA-50 noise restrictions?

Wow.... 4 decibels from a spinner???

I plane on running the Mejlick(sp?) 23 x 8 if they ever come back in stock... and have a Petes CF spinner... wonder how much of a difference that makes?
Old 11-10-2005, 09:44 AM
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quist
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Default RE: DA-50 noise restrictions?

I have been around the Da50 with the stock muffler and there is no way it pass db unless the engine is over proped to it produces no rpm.

I was running the slimline pitts with a bolly 22-8 and it was loud. I switched to the KS 1060 pipe and a Bolly 23-8 prop and it is better but it still is not quiet. But it is good enough.
Old 11-10-2005, 04:11 PM
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Buzz Lightyear
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Default RE: DA-50 noise restrictions?

Use a Mejzlik it will be even quieter. Bolly's are one of the noisiest props around.

Cheers

Buzz
ORIGINAL: quist

I have been around the Da50 with the stock muffler and there is no way it pass db unless the engine is over proped to it produces no rpm.

I was running the slimline pitts with a bolly 22-8 and it was loud. I switched to the KS 1060 pipe and a Bolly 23-8 prop and it is better but it still is not quiet. But it is good enough.
Old 11-10-2005, 05:28 PM
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quist
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Default RE: DA-50 noise restrictions?

I am ok the way it is now. Mejzlik 23-8 are not easy to come by around here. I dont really want that heavy of a prop. The bolly spools up fast.
Old 11-16-2005, 10:26 AM
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toprudder
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Default RE: DA-50 noise restrictions?


ORIGINAL: Buzz Lightyear
First test 94.9db at 3m on grass with aluminium spinner
Second test 90.9db at 3m on grass without aluminium spinner!!!
I've heard of pattern guys spraying the inside of the aluminum spinners with exapandable foam, then carving out enough room for the prop/shaft/nut etc. Would be an easy experiement.
Old 11-16-2005, 04:18 PM
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Buzz Lightyear
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Default RE: DA-50 noise restrictions?

Toprudder

Tried it. It only made 1/2 a db difference. 94.5db.
I have just bought a beautiful 3 blade true turn spinner for my 2.6 Extra and I can it use it at the field because it takes the noise over 96db!!

Buzz
ORIGINAL: toprudder


ORIGINAL: Buzz Lightyear
First test 94.9db at 3m on grass with aluminium spinner
Second test 90.9db at 3m on grass without aluminium spinner!!!
I've heard of pattern guys spraying the inside of the aluminum spinners with exapandable foam, then carving out enough room for the prop/shaft/nut etc. Would be an easy experiement.
Old 11-16-2005, 05:09 PM
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exeter_acres
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Default RE: DA-50 noise restrictions?

tested with a CF spinner??? Wonder if there is a difference?

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