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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: rec tech mower
Date: Wed, 16 Apr 2025 10:31:36 -0500
Organization: Yellow Jersey, Ltd.
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On 4/16/2025 10:26 AM, Frank Krygowski wrote:
> On 4/16/2025 5:28 AM, John B. wrote:
>>
>> Why all this worry about electric mowers? Get a liquid 
>> fuel mower and
>> build a proper exhaust system so it's quit :-)
> 
> Long ago in some engineering forum one guy described 
> modifying his mower's exhaust system, mostly by adapting a 
> far larger muffler. But the engine exhaust is only part of 
> the noise from a typical mower. Much of the noise is 
> generated aerodynamically by the 21" or 22" blade whirling 
> around in a sort of echo chamber beneath the engine.
> 
> Many electric mowers use much smaller blades, eliminating 
> most of that noise. Mammotion's mowers https:// 
> us.mammotion.com/  use discs that carry little razor blades 
> on their periphery.
> 


Hmmm.  Nice McGuffin for a murder mystery.

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971