Elon Musk started a price war that Tesla can't win

[donquixote99]

OK, I'll buy 40,000 rpm for a turbine, but geared way down for the rotors. You were not seeing (and in particular not hearing) a thing with supersonic rotors.

[BigElCat]

Originally Posted by donquixote99

OK, I'll buy 40,000 rpm for a turbine, but geared way down for the rotors. You were not seeing (and in particular not hearing) a thing with supersonic rotors.

It apparently had four electric motors to spin the props, on arms that were proportionally shorter than small scale quad copters.

The body (I guess you'd call it a fuselage) looked like this, except it had no side pods, only landings skids like helicopter. No windows, just four port holes in the lower front facing skin.

polar-lights_star-trek-galileo-shuttle_01.jpg

The rotors would have been spinning with the tips, or hoops, going at sub-sonic speeds.

I brought it up, because it must have had some kind of ultra light weight, high discharge, battery with pretty good range. It wasn't designed for forward speed, or a low drag co-efficient.

[donquixote99]

Originally Posted by BigElCat

It apparently had four electric motors to spin the props, on arms that were proportionally shorter than small scale quad copters.

The body (I guess you'd call it a fuselage) looked like this, except it had no side pods, only landings skids like helicopter. No windows, just four port holes in the lower front facing skin.

Attachment 4245



The rotors would have been spinning with the tips, or hoops, going at sub-sonic speeds.

I brought it up, because it must have had some kind of ultra light weight, high discharge, battery with pretty good range. It wasn't designed for forward speed, or a low drag co-efficient.

OK. what had me going is that 40,000 rpm number. What you describe now would have nothing going any where near 40,000 rom.

[finnbow]

Tesla says profits fell 55 percent in the first quarter to $1.13 billion while revenue declined 9 percent.

https://www.washingtonpost.com/techn...nings-outlook/

[BigElCat]

Originally Posted by donquixote99

OK. what had me going is that 40,000 rpm number. What you describe now would have nothing going any where near 40,000 rom.

Bah ! One has to take what I say with a 'grain of salt'.

When folks talk about money, 40M is $40,000, not 40 million. (and this supports my argument somehow)

Guess I was talkin' about metric RPM. It made a 'whirr' noise. (grin) Minimal down draft, lots of lift.

[Rajoo]

Originally Posted by BigElCat

Bah ! One has to take what I say with a 'grain of salt'.

When folks talk about money, 40M is $40,000, not 40 million. (and this supports my argument somehow)

Guess I was talkin' about metric RPM. It made a 'whirr' noise. (grin) Minimal down draft, lots of lift.

Everywhere I looked, $40M is 40 Million dollars. If its $40,000 usually designated as $40K.

Also as to high rpm motors, we have a CNC that is capable of 40,000 rpm but we don't run it over 15K rpm because, at higher rpm's the torque (force required to shear metal) is greatly diminished. Also familiar with 80K rpm motors, but they are small and usually pneumatic because an air blanket is used as a bearing (no metal to metal contact and the air needs to be expunged anyway).

As to rotors capable of lift, making a bearing to handle the thrust and vibration will be a far bigger challenge.

[donquixote99]

In my long ago, M was millions, and thousands were just false precision after the decimal point, as in $29.208M.

[Rajoo]

^^I looked this up. "M" is a million and so is "MM", supposedly representing thousand thousand, but the logic defies me.

[BigElCat]

LOL.

We probably have nano accounting these days, to go along with our fiat currencies. Decimal places too small to be seen with the naked eye.

As much as I like physical currencies, I think we should round everything off to the nearest dollar, do away with coins.

[donquixote99]

Originally Posted by BigElCat

LOL.

We probably have nano accounting these days, to go along with our fiat currencies. Decimal places too small to be seen with the naked eye.

As much as I like physical currencies, I think we should round everything off to the nearest dollar, do away with coins.

Agree. Coins now too low in value to be worth the trouble to spend them.