[geocentrism] ion motors

From: "philip madsen" <pma15027@xxxxxxxxxxxxxx>
To: "geocentrism list" <geocentrism@xxxxxxxxxxxxx>
Date: Sun, 8 Apr 2007 08:42:10 +1000
Re ion motor.

I have never thought the ion motor as very powerful, but my info was decades 
old..here is the latest. Keep in mind they need mass to be used up as fuel, 
which must be called a "fuel supply load". The reaction M x v  = M x v  is 
maximised because the ions electrical fields/charge (the power supplied)  can 
theoretically accelerate the fuel mass to velocities approaching the speed of 
light. which is far more efficient than chemical fuels. 

Also the power available is still very limited from the solar panels.  5 kW 
even at 100% efficiency is not much lift. 

More realistic is the (not to be publicised) portable nuclear power generators 
that have been used in space.

"Budget constraints and recent advances in solar cell technologies have ended 
what one industry analyst calls the Defense Department's longstanding 
"flirtation" with developing nuclear power sources for spacecraft, according to 
industry and Pentagon sources...... 
"The military had an ongoing flirtation with nuclear power for nearly 50 years, 
and now they are saying it is over," said Steven Aftergood, senior research 
analyst at the non-profit Federation of American Scientists, a think tank based 
in Washington, DC. 

Nuclear power offers at least a 100-fold increase in power generation over 
traditional technologies  http://www.fas.org/sgp/news/2001/03/iaf030201.html

I don't believe them. when they say its over, and the potential is far more 
than 100 fold. !  

"Although the National Space Policy and the Defense Department's space policy 
require presidential approval for the launch of payloads containing nuclear 
reactors, that stipulation has not prevented DOD's involvement in such 
projects, Aftergood said. In his four years in office, former President George 
Bush approved two such launches."

An interesting model is the "solar sail" which directly converts photon energy 
from the "solar wind" ..  Not for orbiting satellites though.   Philip. 

Thi ion motor. 


An ion engine test
An ion thruster (or ion drive) is one of several types of spacecraft 
propulsion, specifically electric propulsion. It uses beams of ions - 
electrically charged atoms or molecules - for propulsion. The precise method 
for accelerating the ions may vary, but all designs take advantage of the 
charge-to-mass ratio of ions to accelerate them to very high velocities using a 
high electric field. Ion thrusters are therefore able to achieve high specific 
impulse, reducing the amount of reaction mass required, but increasing the 
amount of power required compared to chemical rockets. Ion thrusters can 
deliver one order of magnitude greater propellant efficiency than traditional 
liquid fuel rocket engines, but are constrained to very low accelerations by 
the power/weight ratios of available power systems.

The principle of Ion thrusters go back to the concepts developed by the 
German/Austrian physicist Hermann Oberth and were published in his famous 1929 
work "Die Rakete zu den Planetenräumen" (The rocket to planetary space).

The first ion thrusters, known as Kaufman-type ion thrusters, were developed by 
Harold R. Kaufman, working for NASA in the 1960s, and were based on the 
Duoplasmatron.

      Contents
      [hide]
        a.. 1 Types of ion thruster 
        b.. 2 General design 
        c.. 3 Energy usage 
        d.. 4 Thrust 
        e.. 5 Lifespan 
        f.. 6 Missions 
          a.. 6.1 SERT 
          b.. 6.2 Smart 1 
          c.. 6.3 Artemis 
          d.. 6.4 Deep Space 1 
          e.. 6.5 Dawn 
          f.. 6.6 Hayabusa 
        g.. 7 Development 
        h.. 8 Ion Engines in Popular Culture 
        i.. 9 See also 
        j.. 10 References 
        k.. 11 External links 

     

  ----- Original Message ----- 
  From: Dr. Neville Jones 
  To: geocentrism@xxxxxxxxxxxxx 
  Sent: Thursday, April 05, 2007 10:01 PM
  Subject: [geocentrism] Re: Proof of Heliocentric Incorrectness and Deception


  Paul,

  My response below in red.

  Neville.


   
    The 440 Newton Liquid Apogee Motor (LAM), which was used to conduct 
INSAT-3E orbit raising manoeuvres, has performed well. It enabled taking the 
satellite from its Geosynchronous Transfer Orbit (GTO) of 649 km perigee and 
36,000 km apogee with an orbital inclination of 7° with respect to the 
equatorial plane to its present near GSO orbit with zero degree inclination. 
The LAM was fired for a total duration of 121 minutes in three phases on 
September 29, September 30 and 1st October. A total velocity of 1460 m/sec was 
added by LAM at the Apogee point of the orbit to take the satellite from GTO to 
GSO. 

    INSAT-3E had 1592 kg propellant at the time of its injection into GTO by 
Ariane-5 launch vehicle on September 28. After orbit raising operations, it has 
510 kg of propellant remaining that is sufficient to arrest the drift and park 
it at its orbital slot as well as maintain the satellite in its orbit and 
controlling its orientation during its design life of more than 12 years. 

    Just to repeat, 510kg of fuel for 12 years operation. It uses fuel at the 
rate of 8.94kg per minute so with 510kg remaining, that means it has 57 minutes 
of firing time to last 12 years. This is approximately one part in 111,000.

    I think you can see just how unlikely it is that this amount of fuel could 
possibly suspend the weight of this satellite for this length of time even if 
its weight were just 25kg. Accordingly, I won't attempt to educate myself to a 
level sufficient to calculate weight at 36000km, or thruster efficiency, or 
anything else. I think that myth is busted! And best of all, NASA isn't 
involved, so you know it isn't lies!

    It is possible that we do not need liquid fuel thrusters for height 
adjustments as solar powered electrical thrusters have been developed for this 
purpose and have been in successful long-term operation since about 1993, I 
believe. Such a method would negate your comments above.



------------------------------------------------------------------------------
  To help you stay safe and secure online, we've developed the all new Yahoo! 
Security Centre. 


------------------------------------------------------------------------------


  No virus found in this incoming message.
  Checked by AVG Free Edition.
  Version: 7.5.446 / Virus Database: 268.18.26/748 - Release Date: 5/04/2007 
3:33 PM
Attachment: 375px-Ion-engine-NASA.jpg
Description: JPEG image
References:
- [geocentrism] Re: Proof of Heliocentric Incorrectness and Deception
  - From: Dr. Neville Jones
[geocentrism] ion motors

Other related posts:
