Pound for pound.. electric vs gas

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BBerson

Light Plane Philosopher
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Dec 16, 2007
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Port Townsend WA
A special muffler is lighter and cheaper than a ton of batteries. The YO-3 was silent with a standard engine.
Most of us drive silent (except for tire noise) gas powered vehicles.
 

DonEstenan

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Feb 14, 2016
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Location
Slovakia
A special muffler is lighter and cheaper than a ton of batteries. The YO-3 was silent with a standard engine.
Most of us drive silent (except for tire noise) gas powered vehicles.
C'mon, at least be serious.

Many(most?) GA pilots use noise cancelling headphones for a reason.

Road vehicles have silencing weight budgets way beyond what is feasible on an aircraft.
Electric cars are still noticeably quiter anyway.

YO-3 went to great lengths to contain engine noise, far beyond a special muffler.

And reducing noise is just one (and not the most significant) benefit of an electric propulsion.

I am not saying it does not have serious practical drawbacks ... but you have to look at the whole picture, and there are benefits that do not show if you look just at price/weight/performance numbers.
 

pictsidhe

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Jul 15, 2014
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7,526
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North Carolina
It's not hard to reduce the exhaust noise of an aero engine to well below prop noise. it's rarely done as it is rarely required. An unnecessary muffler is unnecessary weight and cost. A muffled aero engine is still going to weigh far less than an electric system of any duration.

Here's an Edgely Optica, notice how quiet it is compared to other aircraft taxiing nearby. It had a ducted fan for reduced noise compared to a prop.

[video=youtube_share;iVr3u6E66EM]https://youtu.be/iVr3u6E66EM[/video]
 

BBerson

Light Plane Philosopher
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Dec 16, 2007
Messages
13,244
Location
Port Townsend WA
Can only barely hear the engine on the Optica. Sounds like a big electric vacuum cleaner.
I have tested electric R/C airplanes with my sound meter that were louder than a well muffled gas model.
Pusher noise can be really annoying. Especially the Avanti. The Avanti flew over me and I could here it for several minutes, all prop noise.
Prop noise video:https://m.youtube.com/watch?v=Dk4jNSBwl4Q
 

blane.c

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Jun 27, 2015
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capital district NY
I like the Optica, it is however ugly it would be difficult to get my wife to be seen in it. It would of course be better with three engines, but I doubt that would improve its looks.
 
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