[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

*Subject*: Re: [amsat-bb] satellite propulsion thrust equations*From*: Robert McGwier <rwmcgwier@xxxxxxxxxxx>*Date*: Wed, 12 Oct 2005 14:31:49 +0000*In-Reply-To*: <45.328d9044.307d8920@aol.com>*User-Agent*: Mozilla Thunderbird 1.0.2 (Windows/20050317)

While not at its peak intensity, the radiation environment would be intense and I think your bird would spend more time in this area than a Phase 3 HEO. We would have to do some detailed calculations but my intuition tells me the total dosage would be higher in your bird. Secondly, the complexity in these satellites is not strictly the height of the orbit BUT the need to carry a propulsion at all. Once you have crossed that threshold, you might as well optimize it for communications. You have also discovered what a huge boost (pun intended) we are given in delta-V by getting off at GTO rather than at LEO altitudes. To get to your altitude the satellite would have to carry more fuel than a Phase 3 bird. You would have to do two or more burns to raise the satellite to your orbital height. Pick two points on your low orbit "180 degrees apart". Align your rocket motor to the orbit at ONE of them. You burn the motor to raise the altitude of the OTHER one. Then you have to realign the satellite to orbit at the (now raised high) other point and do the same burn. This is called a Hohman transfer and this exact scenario may be seen pictorially here: http://liftoff.msfc.nasa.gov/academy/rocket_sci/satellites/hohmann.html I view your MEOSAT mission as likely to be of greater complexity than Phase 3. That said, those of us who pretend to be rocket scientists, can always miss a good idea. Bob N4HY -- Laziness is the number one inspiration for ingenuity. Guilty as charged! ---- Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

**Follow-Ups**:**Re: satellite propulsion thrust equations***From:*Bruce Robertson

**References**:**satellite propulsion thrust equations***From:*G0MRF

- Prev by Date:
**Re: satellite propulsion thrust equations** - Next by Date:
**Re: satellite propulsion thrust equations** - Prev by thread:
**satellite propulsion thrust equations** - Next by thread:
**Re: satellite propulsion thrust equations** - Index(es):