There are 50 to 60 satellites per launch. So that would be on the range of 800
launches x 425 then divide by 4.6 per car per year and it’s still only 75,000
cars for one year. Space launches are a very small percentage of CO2
contributions.
Sent from AT Yahoo Mail for iPhone
On Friday,
On 7 Jan 2022 at 15:43, Cal Frye via EV wrote:
> Today's single Falcon 9 launch lifted 49 Starlink satellites. I think
> your estimate is a mite high?
Oops.
Never forget: ignorance can be cured, but stupidity is forever.
David Roden, EVDL moderator & general lackey
To reach me, don't reply
vdl.org
Cc: "Cal Frye"
Subject: Re: [EVDL] Regen toll (was: Tesla Y actual wall outlet efficiency)
Today's single Falcon 9 launch lifted 49 Starlink satellites. I think
your estimate is a mite high?
Best regards,
-- Cal Frye,
On 1/7/22 3:19 PM, EV List Lackey via EV wrote:
> On 7
Today's single Falcon 9 launch lifted 49 Starlink satellites. I think
your estimate is a mite high?
Best regards,
-- Cal Frye,
On 1/7/22 3:19 PM, EV List Lackey via EV wrote:
On 7 Jan 2022 at 14:24, paul dove via EV wrote:
Be interested to see those numbers.
Sure.
Sorry that I didn't
On 7 Jan 2022 at 14:24, paul dove via EV wrote:
> Be interested to see those numbers.
Sure.
Sorry that I didn't save links to my sources, but you're welcome to look
them up for confirmation or correction I think that most of them were US
federal agencies - DOE, EPA, maybe NASA.
Spacex
-Original Message-
From: "paul dove via EV"
> by my calculation a Falcon 9 launch produces 425 metric tonnes per launch.
> there has been 3 heavy launches that produce 2683 metric tonnes. [per launch
> implied from other part of message]
Fails sanity check. A Falcon 9 has one
Be interested to see those numbers.
by my calculation a Falcon 9 launch produces 425 metric tonnes per launch. So
far total launches period for Space x is around 150 counting all their Rockets.
there has been 3 heavy launches that produce 2683 metric tonnes. 147 x 425 =
62,475 + 3 x 2683 =
On 6 Jan 2022 at 20:47, Peter VanDerWal via EV wrote:
> For one thing, tires on a Tesla are NOT optimized for effiiency, they
> are optimized for traction and low noise.
That's an interesting observation on Tesla's priorities.
I rough-calculated a while back that Spacex's project to lauch
85% was for everything between the batteries and the road.
You'll lose some energy in the inverter, some more in the motor, some more in
the drivetrain, and finally some more in the tires.
15% loss (85% efficiency) through ALL of that seems, perhaps, a bit optimistic
even for a Tesla. For one
Y actual wall outlet efficiency)
I can assure you that the Model 3/Y Powertrain is way above 85% efficient.
85% might have been reasonable for a mechanically commutated DC motor, but even
modern non-Tesla powertrains are better than that!
On Tue, Jan 4, 2022 at 3:27 AM Cor van de Water via EV
On 4 Jan 2022 at 1:55, Otmar via EV wrote:
> ItTMs such a treat to get to live through this transition to sustainable
> transportation for everyone and also get back to the lead foot of my youth.
Well, I don't know that I'd say "sustainable transportation," but EVs
definitely move us closer to
I can assure you that the Model 3/Y Powertrain is way above 85% efficient.
85% might have been reasonable for a mechanically commutated DC motor, but
even modern non-Tesla powertrains are better than that!
On Tue, Jan 4, 2022 at 3:27 AM Cor van de Water via EV
wrote:
> Reason you can't drive as
Reason you can't drive as conservatively as you'd like is simply: other traffic.
If you are alone on a 45MPH road, nobody cares if you want to do 35,
but if 2 lanes of traffic are storming at you doing 55-60 then it is
mightily inconvenient if someone is blocking the road at 35.
The other reason
On 4 Jan 2022 at 22:40, Bill Dube via EV wrote:
> Whatever the drivetrain losses, they at least double when you
> regeneratively brake.
I see your point, but I think it's a bit academic. Assuming your 85%
efficiency number, you aren't losing 30% on regen, you're losing 15%.
You've already
This mention “but you can perhaps actually get where you plan to go. :-)”
Brings me nostalgically back to the old days of range anxiety of short range
conversions.
For the last 9 years or so I’ve been driving a Tesla. I conceptually still
appreciate the efficiency boost of regen, but these
With an AC drive, there is no excuse not to use regen. It is built in,
and essentially free. At least equipment wise.
Regen has significant energy losses, however, so you should use it
sparingly, or at least knowledgeably.
Typical EV drivetrain losses are in the ~15% range, give or take.
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