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it can change a game for satellites

. Author: David Judbarovski, systems engineering, principle inventor, retired. judbarovski@gmail.com, judbarovski.blogspot.com. It doesn't need a special start/land pods, but only permitted by ordinary air traffic safety regulation. Abstract. A key element of the possible invention is a VTOl and strategy can lift and land a satellite or/and materials relatively free if the VTOL design of my invention of 40 kW/ton, see Vertical take-off amd Landing Device - 20.07.2020, see judbarovski.blogspot.com/2020/07, posted on July 20, 2020. Satellite is served on low orbits, its PV direct solar illumination can be 10 hr.* 1.4 kW * 365 days a year = 5000 kWh/m2 of the PV receiver. Down to 10 km usiрng ICE, expenses are negligible, then and lower than designed orbit it is CH2 + pressed oxigen for jet mover, and then accelerated. For example, if 100 ton satellite, to reach an orbit 300 km hight it consumes 2 hours and about 1.6 ton kerosene and 4.5 ton 300 atm. pressed oxigen by a tot...
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One of threat of a land subsidence can be prevented.

  Dear Dr. Geraldo Herrera--Garcia,  Dear Dr. Avinoam Rabinovich. Date:  04 June, 2025 Tal Aviv under threat of land subsidence can ruin them, because underground water resources exploiting. See One of the threats for the mankind can be prevented,judbarovski.blogspot.com/2022/11, posted on 28 Nov,2022 After geophysical investigation inside and nearby of as actual holes as abandoned ones and wells to them, in a danger we can pump pressed air into the holes to compensate load fully or partly on them from upper sides. For the following, the said air pressure can be controlled by very cheap sensor and small and cheap diaphragm compressor.  Sincerely,  David Judbarovski, systems engineering, principle inventor. retired.  judbarovski.blogspot.com, judbarovski@gmail.com  ,
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Rehab of solar thermal power stations.

Rehab of solar thermal power stations. Here being about 0.5 cent per kWh electricity Author: David Judbarovski, systems engineering, principle inventor. retired.  judbarovski.blogspot.com, judbarovski@gmail.com  Abstract  Small heating units  are unusual and  c omprises three thin sheet mirrors each. Planar one redirects solar flux onto motionless solar concentrator about 1 m2 with motionless focal spot, and father third tiny mirror in the focal spot redirects on motionless tube with heat carrier at the end with two tanks' known high temperature heat storage system. Such small heating units can be about USD 25 / m2 each and 5 years payback and serves to convert the heat into artificial fuels. 500 cent /( 2500 * 0.4) = 0.5 cent /kWh electricity. Q.E.D.
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Aircela machina for fuels production, some notes

  Eric Dahlgren, PhD, CEO,    Mr. Kristian Tuszynski, CTO, Dr. Klaus Lackner, Senior Science Advisor,  Aircela, USA, https://www.aircela.com.  Date: June 01, 2025.  Dear gentlemen!  Can I suppose that your excellent machine to produce fossil-free, motor  grade fuels, ready for any engine, can be sufficiently cheapened if you would adopt some ideas used in my design for the same purpose.  (1)   Direct CO2 capture from the air by KOH gives CO2  being more than USD 60 / ton, because potassium-ion leakage, even if the leakage being 1 % in each step of its cycle. My way is traditional Ca(OH)2 with about USD 5 / ton CO2, see   CO2 mass production from the air very cheaply, judbarovski.blogspot.com/2025/01. posted on 12.01.2025. and  (2) S olar and Wind as cheap  0.4 US cents / kWh can change a game, judbarovski.blogspot.com/2025/02. posted on February 11, 2025 , and I have used half green   0.5 C + H20 = H2 +...
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Green and incredible cheap (USD 6.0 /bbl OPEX) fuels (hydrocarbons) production.- Upgrade

   Green and incredible cheap (USD 6.0 /bbl OPEX)  fuels (hydrocarbons) production.-  Upgrade Author: David Judbarovski, systems engineering, principle inventor. retired.  judbarovski.blogspot.com, judbarovski@gmail.com  Abstract.   Technological chain offered here allows integration of huge solar thermal energy in national grid, by green fuel, synthetized distribute and domestically from atmospheric CO2 and ammonia, the both can be  breakthrough cheap and based on original inventions well scalable. and allows hazard free and reliable energy supply.     (1) 2 NH3 + CO2 extracted from the air = CH2 hydrocarbons + 2 H2O + N2 + 137 KJ into electricity for sale., Here Gibbs free energy is negative. (2) 0.5 C + H2O =  0.5 CO2 exhaust + H2 - 90 KJ.  [2], (3)   NH3 being incredible  cheap (USD 22.0 / ton NH3), you can see in [3]   (4)  CO2 of about USD 5 / ton CO2 can be extracted from the air by com...
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Half green and incredibly cheap ammonia simplified production.

 Half green and incredibly cheap ammonia simplified production.  Author: David Judbarovski, systems engineering, principle inventor. retired.  judbarovski.blogspot.com, judbarovski@gmail.com  Abstract.  (1) 0.5 C + H2O = H2 + 0.5 CO2 - 90 KJ. (2) Air 0.75 (O2+ 4 N2) + NH3 = 1.5 H2O + 3.5 N2 + 383 KJ can be converted in electricity for sale or to support reaction (1)..  (3) 0.5 N2 + 1.5 H2 = NH3 + 46 KJ can be converted into electricity for sale or to support reaction (1) NH3 cost OPEX would be 360 * 3 -  (383 + 46 - 90) * 1,000 * 0.25 * 0.03 /3.6  = USD 22.0 / ton NH3,  Q.E.D.  Really,  if C being USD 120 / ton, H2 = USD 360, and if electricity tariff being USD 0.03 /kWh and efficiency 0.25, H2 = USD 360 / ton H2 by (1) ,  and such H2 is much cheaper than  reformed traditionally from CH2 or CH4 by the water vapor in ammonia industry, while  multiplied N2 by (2) is negligible and much simpler technology than cryogenic ...
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Green fuel production by incredibly cheap ammonia and solar thermal energy.

  Green fuel production by incredibly cheap ammonia and solar thermal energy.  Author: David Judbarovski, systems engineering, principle inventor. retired.  judbarovski.blogspot.com, judbarovski@gmail.com  Abstract.    Technological chain offered here allows integration of huge solar thermal energy in national grid, by green fuel, synthetized distribute and domestically from atmospheric CO2 and ammonia, the both can be  breakthrough cheap and based on original inventions well scalable. allows hazard free and reliable energy supply.     (1) 2 NH3 + CO2 extracted from the air = CH2 hydrocarbons + 2 H2O + N2 + 179 KJ into electricity for sale., (2) 0.5 C + H2O =  0.5 CO2 exhaust + H2 - 90 KJ.  Such H2 is USD 400 / t H2, so much cheaper than reformed traditionally from CH2 or CH4 by the water vapor in ammonia industry. (3) The air + NH3 = 1.5 H2O + 3.5 N2 instead of cryogenic monster for N2 production.  (4) 0.5 N2 + 1.5 H2 = NH3 + ...
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