What is Aptera doing to address noise, vibration and harshness, NVH? What sound deadening materials will be used and where? How will the harmonics of the hub motors (unsprung weight) and ride quality (suspension) be addressed? Will it have double pain glass to reduce noise? I own a Tesla M3 and it’s not the quietest, most comfortable car I have ever driven. Also, what are the specifications of the tires? What manufacturer will be used? I assume a flat repair kit will be included.
They claim the monocoque composite body is inherently quiet. In the discussion video about the wheelpants, they mentioned supports in the outside panel on the front wheels to reduce harmonic vibrations, so we know they’re thinking about it. The compound curves on the large structural components will also stiffen the body.
Much of the noise from an ICE vehicle is engine, tire, and air. All of these are significantly reduced by Aptera’s design. I can compare my 2001 Honda Insight that I drove for 15 years. It was relatively aerodynamic and had low rolling resistance tires. It was quiet enough that I was often unaware that I had reached 90+ mph on my interstate commute.
I hope they are paying attention to it. I also have a Model 3 and the noise is really annoying. I previously had a Volt which ran around on little cat’s feet when it was in electric, when I got the Model 3 I was surprised by how loud it was. Tesla’s big mistake are the frameless windows, they always sound like a window is open. The top part of the Aptera’s windows are fixed but there is a lower window that rolls down, hopefully it won’t suffer from the same problems as Tesla. Newer Tesla’s have double pane glass and better seals which are supposed to help. Tesla also skimps on the sound deadening material, that’s something that’s cheap so there is no excuse not to put it in every place that needs it.
You’re asking a lot of questions that won’t be answerable until the Delta development phase – and Aptera is currently in the Beta phase.
MOST of the acoustic materials used in metal-bodied vehicles is to stop “oil-canning” – the sound made by flexing panels of metal. It’s applied where needed – just watch a Sandy Munro tear-down video.
Munro has also spoken to the fear of hub motors as unsprung weight and the effect it does NOT have on vehicle ride, handling and performance.
Aptera’s opening door windows are relatively small and are NOT in an high-pressure area of the body where they will be buffeted by wind. Although I know the benefit of acoustic glass, it’s more than twice as thick as regular door glass and more than twice as heavy, requiring beefier, heavier mechanisms to move it.
Having compared a 2018 M3 with a 2022 M3 I can assure you that they are entirely different vehicles when it comes to passenger comfort: The 2022 seats are vastly more comfortable and supportive and the interior is, easily, twice as quiet.
Aptera rolls on 195/45 R16 LRR rubber – one assumes they’ll go with whichever tire they deem most suitable to the vehicle’s needs. Yes, most vehicles come with a flat repair kit nowadays – but they’re an inexpensive addition, if not provided by the manufacturer.
A fair amount of NVH engineering can be done in simulation and I presume that has been happening. “Delta” engineering is well underway, I believe, and that’s when it has to happen. (The public view is Alpha and Beta and should soon be Gamma, but it is a continuous and overlapping process.) Once Gammas start getting built, fixes might be identified physically. I’d guess that minor fixes to Deltas (and Paradigms) might even be needed. No one said it would be easy.