[AR] Re: 500,000 tons per year to GEO (off topic)

  • From: Bill Claybaugh <wclaybaugh2@xxxxxxxxxx>
  • To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
  • Date: Wed, 2 Apr 2014 14:31:48 -0700

If you are going to make ridiculous assertions, please provide the math to 
prove them.  Even SpaceX says rocket back will not get below $1000 per pound, 
and that takes hundreds of launches per reusable stage.

If you are not going to provide proof of your silly claims, please stop making 
them.

Bill

Sent from my iPhone

On Apr 2, 2014, at 14:00, marsbeyond@xxxxxxxxx wrote:

> It uses only 30% of PAYLOAD. Listen to Gwynne Shotwell's most recent 
> interview on "The Space Show" very carefully. For what purpose would you ever 
> fly it up range? Just land on a barge or land downrange. Actually $80 per 
> pound is doable.
> 
> Sent from my iPhone
> 
> On Apr 2, 2014, at 12:53 PM, Bill Claybaugh <wclaybaugh2@xxxxxxxxxx> wrote:
> 
>> Please.
>> 
>> Landing the first stage downrange uses 15% of the payload; flying it back up 
>> range cost 30% of payload.  Even if refurbishing and relaunch were free, 
>> propulsive fly back will take four launches just to cost the same as 
>> expending. Since they are not free, it is more likely to take something 
>> between 12-24 launches for this system to cost exactly the same as the 
>> expendable version.
>> 
>> This also means that production rates will drop and so those cost will go up.
>> 
>> And then there's the customers who want to know why they should fly on a 
>> used rocket....
>> 
>> $100 per pound is not achievable with this system.
>> 
>> Bill   
>> 
>> Sent from my iPhone
>> 
>> On Apr 2, 2014, at 10:49, marsbeyond@xxxxxxxxx wrote:
>> 
>>> Kieth,
>>> 
>>> When is Skylon supposed to fly? In less than two years, SpaceX will be 
>>> using propulsive recovery to re-use the first stage, second stage, and 
>>> capsule, and their cost to LEO will drop to $100 a pound!
>>> 
>>> Sent from my iPhone
>>> 
>>> On Apr 2, 2014, at 9:27 AM, Keith Henson <hkeithhenson@xxxxxxxxx> wrote:
>>> 
>>>> http://theenergycollective.com/keith-henson/362181/dollar-gallon-gasoline
>>>> 
>>>> $350 million committed so far to the Skylon engines.
>>>> 
>>>> Keith
>

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