There is video of the battery ejection.
Should be able to model the battery weight by estimating size from that and
assuming standard Liion battery density.
Or maybe estimate size from this image:
https://i.stack.imgur.com/EucQJ.png
On Mon, Jan 17, 2022 at 11:07 PM George Herbert <george.herbert@xxxxxxxxx>
wrote:
We do have some of the payload masses and their orbits, but don't know how
close those were to its performance limits. So ... (shrug)
-george
On Mon, Jan 17, 2022 at 9:56 PM Henry Spencer <hspencer@xxxxxxxxxxxxx>
wrote:
On Tue, 18 Jan 2022, Troy Prideaux wrote:
If I vaguely recall, the Electron does have an unusually highreliance
on its 2nd stage for complete delta V? If so, that would allow the
potential for much higher mass ratios and overall engine performance in
comparison which can skew things I suppose.
One problem John has mentioned in conversation in the past is that the
second stage jettisons spent batteries partway through its burn, there
doesn't seem to be any public information about how much they weigh, and
it really matters to performance modeling.
And one problem that I have definitely noticed is that the Electron
Payload User's Guide is distinctly short of performance data. Even the
data on the basic two-stage configuration is frustratingly sketchy --
better than it used to be, but not by much. When it comes to the
optional
third stage ("kick stage"), there's hardly anything but marketing
puffery,
with nary a useful number to be seen.
Henry
--
-george william herbert
george.herbert@xxxxxxxxx
