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DL55 Sound Levels

Old 08-06-2009, 09:58 AM
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bkdavy
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Default DL55 Sound Levels

I'm working on identifying my next setup. Currently planning a Pilot RC Yak 54 (30%) and I want to use a DL55 as the powerplant. the fuselage is preconstructed for a cannister. This is my first gasser, and before I spent $200 on the cannister, I was wondering if anyone knows the typical sound levels with the stock muffler on the DL55. Our field has a [email protected] feet rule, and if I can stay below that with the stock muffler, I wouldn't mind saving the $.

Brad
Old 08-06-2009, 10:00 AM
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Tired Old Man
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Default RE: DL55 Sound Levels

Loud and prop dependant. If you want quiet you will need a cannister, and do some prop experimentation to find the one that works best with your airframe. That description fits about all the other gassers using "directive" exhaust components. I deliberately did not call them "mufflers".
Old 08-06-2009, 10:28 AM
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Default RE: DL55 Sound Levels

My worn out DL50 from the "DL50 low compression, low power, bad idle" thread was 101 i think at full throttle with either a xoar 22-8 or 23-8 (can't remember exactly). Thankfully, we are on the indian reservation and the closest home is over 1/2 a mile away. Actually, that home was complaining about noise. Eventually we got the police involved and asked them to check the sounds levels at the house. Turned out the lady was primarily complaining about the full scale airplanes on approach for both Phoenix Sky Harbor and Scottsdale Air Port.
Old 08-06-2009, 11:40 AM
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Default RE: DL55 Sound Levels

101 at what distance? 9 feet? or was it closer?

Brad
Old 08-06-2009, 11:58 AM
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Default RE: DL55 Sound Levels

My DL-50 with stock muffler is not necessarely quiet. But I wouldn't want to call it especially loud either. A canister is definitely the ticket if you look for a quiet set-up.
Old 08-06-2009, 12:55 PM
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Default RE: DL55 Sound Levels

I have a DL50 with the stock muffler that measures 95 dB at 9 feet using a Menz S 22x8, so I think you'll probably be above 90. In general, it's pretty loud with the stock muffler compared to many other 50cc engines at our field.

-Ed B.
Old 08-06-2009, 01:43 PM
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Default RE: DL55 Sound Levels

So looks like I'll be going with the canister. Can someone explain to me why a few ounce of stainless steel and a couple of welds cost $200??

Thanks,
Brad
Old 08-06-2009, 01:52 PM
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Default RE: DL55 Sound Levels

I made one once that basically started as two bud light aluminum bottles. They where sand blasted to get the paint off and combined to create multiple chambers. I never hooked it up to a my DL but I got a 46ax so quiet that it sound like an electric from 3ft away.
Old 08-06-2009, 01:56 PM
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Default RE: DL55 Sound Levels

I've been looking at those designs, but trying to find the metal bottles is not easy, and I don't have a brazing or welding rig.

Brad
Old 08-06-2009, 02:00 PM
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Default RE: DL55 Sound Levels

I actually used JB weld. It still holds very strong although i didn't really use it much and it never flew on a big plane. Might be worth a shot.
Old 08-06-2009, 02:29 PM
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Default RE: DL55 Sound Levels


ORIGINAL: bkdavy

I've been looking at those designs, but trying to find the metal bottles is not easy, and I don't have a brazing or welding rig.

Brad
Go to the beach, those are the areas where you'll find aluminum bottles.

Or try this, very mellow sound.
Old 08-06-2009, 03:24 PM
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Default RE: DL55 Sound Levels

They charge that because they can. If you tried to have the same or similar product made on an individual basis at a machine or muffler shop the tab would likely be closer to $600.00 and up. They don't sell thousands of them, which is what it would take to get the price lower.
Old 08-06-2009, 06:28 PM
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Default RE: DL55 Sound Levels


ORIGINAL: soarrich


ORIGINAL: bkdavy

I've been looking at those designs, but trying to find the metal bottles is not easy, and I don't have a brazing or welding rig.

Brad
Go to the beach, those are the areas where you'll find aluminum bottles.

Or try this, very mellow sound.
http://www.mtenginesusa.com/products.asp?cat=71
Old 08-06-2009, 08:08 PM
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Default RE: DL55 Sound Levels

Much better pricing. Thanks Rich. Any actual performance data on the MT-C-65 set?

Brad
Old 08-06-2009, 09:44 PM
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Default RE: DL55 Sound Levels

I have a C-60 on my MT57, and if I remember correctly there is a 200rpm loss on the top end. It has a very nice mellow sound and is easy to fit in the plane with the flexible header.

I found a Vess 22a was very loud, ripped a lot. 23x8 TBM very quiet, but really pulled the rpms down, but flew OK. The Xoar 23a was quiet, and flew very well. NX23x8 flys the best, is a little louder than the Xoar, much quieter than the Vess, it has a nice sound to it, not quit a rip.

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