I got briefed of this year’s ago, it was called “Slingatron” at that point.
It seemed—to me—very amusing; a sort of mid-nineteenth century engineering
solution to throwing things pretty hard. Maybe a fun high school science
fair project.
I agree that the idea that VC’s actually understand their investments is
suspect in some cases....
Bill
On Fri, Feb 23, 2018 at 10:05 AM John Schilling <
john.schilling@xxxxxxxxxxxxxx> wrote:
Yes, and if you can get around the gravity, the propulsion requirements
pretty much go away.
Even if you could get around the heating, that's not enough. You need to
get around the heating, and the drag, and the lateral G loading during spin
launch, all of that, without compromising the design to the extent that
your structural coefficient grows by more than maybe 0.01 - 0.02; otherwise
you're farther from orbit when you leave the catapult than you would be
sitting on the pad with a rocket that doesn't have to deal with all that.
If you tell me your system is planning to reach orbit, I want to see plain
cylindrical or conical tanks / motor cases. Simple fairings or even wings
bolted onto the cylinders, fine, but not pointy-nose aerodynamic sleekness
or a TPS rated for hypersonic flight at sea level.
John Schilling
john.schilling@xxxxxxxxxxxxxx
(661) 718-0955
On 2/22/2018 10:30 PM, Bernard Pritchard wrote:
Actually, if he can get around the heating, the G-forces can be held to a
very acceptable minimum. It all comes down to the radius of his launcher.
Do the math for yourselves.
Bernie Pritchard.
On Thu, Feb 22, 2018 at 10:04 PM, Lars Osborne <lars.osborne@xxxxxxxxx>
wrote:
The next time anyone claims that V.C.'s are careful investors who look at
technology fundamentals, I will show them this.
Thanks,
Lars Osborne
On Thu, Feb 22, 2018 at 9:45 PM, Ben Brockert <wikkit@xxxxxxxxx> wrote:
I've been hearing rumors of them for months. They finally came out of
stealth, and are as silly as the name implies.
https://techcrunch.com/2018/02/22/spinlaunch/amp/
<https://urldefense.proofpoint.com/v2/url?u=https-3A__techcrunch.com_2018_02_22_spinlaunch_amp_&d=DwMFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=rPTfWqtJdrL0Ber-yr0E_hSjRXuvJH6ZmQx03u8-2as&m=hbqE1lS_NdVVeeLPmyIl6pnPAi7wQMtkYBEnHvL9_oQ&s=f93RNxdGGOTWqWasfHYgtJS5PAbUwqFdHQsNh9O6Vuc&e=>