Electric aircraft motor - GIF

[Altair]

Electric aircraft motor.

Previously:

Steam aircraft - photos and video
https://www.homemadetools.net/forum/...768#post159766
Magnus effect rotary sail propels cruise ship - GIF
Alcyone Turbosail
18-cylinder radial airplane engine cutaway - photo

[Frank S]

Dadgum that is some High RPMs

[tonyfoale]

Dadgum that is some High RPMs

It is impossible to judge RPM above a certain level due to aliasing. Aliasing is an inherent problem in discrete sampling of continuous data. Wagon wheels in western movies going backwards indicate negative RPM but we know that is untrue.

[hemmjo]

It is impossible to judge RPM above a certain level due to aliasing. Aliasing is an inherent problem in discrete sampling of continuous data. Wagon wheels in western movies going backwards indicate negative RPM but we know that is untrue.

The input to our built in audio sensors send very good data to our main processor infer high RPM even with our optical sensors obscured from the data stream. It is difficult to miss the sound of a hot bike screaming out that 10K+ rpm tune cutting through the still night air out in the country. Even to an untrained ear, that is the unmistakable sound of high speed.

I always say a quick prayer when I hear someone going through the gears at max RPM, hoping that sound will keep the deer or some other obstacle from crossing the road in front of the crotch rocket.

[tonyfoale]

The input to our built in audio sensors send very good data to our main processor infer high RPM even with our optical sensors obscured from the data stream. It is difficult to miss the sound of a hot bike screaming out that 10K+ rpm tune cutting through the still night air out in the country. Even to an untrained ear, that is the unmistakable sound of high speed.

Not so much with my audio sensors damaged by excessive exposure to the inputs that you describe.

[MIGuy]

I guess it isn't very good, the truck didn't take off?

[VinnieL]

Is it battery-powered? If not how do they power it? Maybe start off of batteries and then generate enough power to keep it running? Wonder how long before we can get one at Harbor Freight?

[old kodger]

Is it battery-powered? If not how do they power it? Maybe start off of batteries and then generate enough power to keep it running? Wonder how long before we can get one at Harbor Freight?

I also wondered about the power production to keep it running. The trouble is that to my knowledge, nobody has defied the persistence of energy laws.
Ya'owl can't get out more than you put in

[jdurand]

That was the fully battery life, time for a 48 hour recharge.

I just found my fathers pilot log from 1940 when he was apparently upgrading his license. About 90 hours logged with lots of pylons, spins, stalls, etc. He eventually had multi-engine land and sea rating and was part owner of a C-47.

Interesting that some of the handwriting looks like mine, but I wasn't exactly around in the 1940s.

[Unkle Fuzzy]

Batteries....Lithium to be exact, with a new chemistry on the horizon that may make the same leap ahead of Lithium that Lithium made over Lead-acid.

May 28th a Cessna Grand Caravan flew for 30 minutes on battery only using about $6 worth of electricity. They are currently working to Make 100 mile shuttle fights with 3-4 passengers, with a 30-40 charge time between flights.

35 years ago when I was into R\C an electric model was good for about 2 minutes under power and about all you saw was poorly performing gliders because they were heavy, but less messy than nitro burners.

Most of the better drones can now hover with flight times in excess of 15 minutes.

I read an article a while back about a rental service that uses Teslas and is actually making money on them because the lifespan has far exceeded that of a gas car with less maintenance.