[amsat-bb] Re: Model Rocket Booster Engine for Picosatellite

[Bill Ress]

Aah but David, its a start along the lines you and I have been trying to 
drum up interest. You gotta crawl before you walk. As you know well, 
it's the way to start out in LEO (cheaper launch) and then nudge it into 
MEO. I said before, it's gonna happen since it's the obvious solution to 
getting to a better orbit. A lot to overcome but there's work going on 
now to get there.

Did someone say that the new Delfi satellite will have some thrust on 
board or was it a wishful dream on my part??

Regards...Bill - N6GHz

On 1/17/2012 11:42 AM, G0MRF at aol.com wrote:
> Thanks Joe.
>
> What an exciting concept.
>
> Having got really enthusiastic, I thought I would roughly calculate how
> high one of these little rockets could raise the orbit.
>
> Given that one rocket reload pack has
>
> 40 Newtons of thrust
> and lasts for about one second
> We have 40 Newton seconds of specific impulse.
>
>
> The mass flow rate is 18.6g in one second or 0.0168kg/s
>
> So.....the ISP (a bit vague here) is around 219 seconds (ave thrust / mass
> flow rate / 9.81ms^2)
>
> Which should get a 3.7kg satellite's apogee about..... 40km  higher.
>
> So...Not enough for P3E then
>
> Oh well, not so exciting after all.  Time for a beer.
>
> 73  David  G0MRF
>
>
>
>
> In a message dated 17/01/2012 03:56:37 GMT Standard Time,
> rhyolite at nettally.com writes:
>
> Has  anyone seen this. I am surprised a shuttle mission permitted this
> type of  booster. From what I believed, safety concerns prevented most
> types of  boosters.
>
> http://www.rocketryplanet.com/content/view/3706/30/#axzz1jgQ85qx1
>
> --
> Joe Leikhim
>
> Leikhim and Associates
> Communications  Consultants
> Oviedo,  Florida
>
> www.Leikhim.com
>
> JLeikhim at Leikhim.com
>
> 407-982-0446
>
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-- 
Regards...Bill Ress
High Sierra Microwave