Author Archives: johnhare


About johnhare

I do construction for a living and aerospace as an occasional hobby. I am an inventor and a bit of an entrepreneur. I've been self employed since the 1980s and working in concrete since the 1970s. When I grow up, I want to work with rockets and spacecraft. I did a stupid rocket trick a few decades back and decided not to try another hot fire without adult supervision. Haven't located much of that as we are all big kids when working with our passions.

Electric Inducer Pump

It takes pressure in the tank to suppress cavitation in the pumps for rocket engines. It is customary to use helium for most pressurization due to its’ low molecular weight. Unfortunately, it can take a lot of helium in some … Continue reading

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Notchbell Nozzle

Several years back I suggested a type of compensating nozzle that should be inexpensive to build and test. Unfortunately the ones I made for demonstration with compressed air were hit and miss as I didn’t have the theory quite right. … Continue reading

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Old Engines

Some before, and many after the accident criticized the use of old engines for the Antares. Many references were made to the long storage time with some mention of them as antiques. The refurbishment of these engines didn’t seem to … Continue reading

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Sea Launch Sold

I read just yesterday that Sea Launch has been sold. Then I get an email last night that this post from August 2014 inspired the purchase that solidified when SpaceX was able to recover on land the first try after … Continue reading

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Max Diameter Compensating Nozzle

One of the items that seems to be missing from the current crop of LVs is any hint of compensating Nozzles. So a nozzle normally flies that is over expanded at sea level, optimum for a few seconds at some … Continue reading

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Seven Core RLB

In the discussion on Jons’ last post it was mentioned that seven cores could be used in the VTVL booster technique with the outer six semi-permanently attached as a single unit. If they are close to gas-n-go on landing, then … Continue reading

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Long Range Stage Recovery

Recovering stages from far down range is likely to be on the agenda for several companies in the next decade or so. RTLS for the boosters or a first stage is a different proposition than collecting something from Mach several … Continue reading

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The Return of FalconV

In the last several weeks two companies have landed boosters that have been to space. The boost back RTLS with VTVL is now established as a demonstrated capability. What’s next? The boost back gets the upper stage(s) to space with … Continue reading

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Simple SPS ??

Reading about the drawbacks of conventional Solar Power Satellites and the comments in response to Chris eventually triggered an idea, or perhaps a memory of something hinted at in something I read once. I’m somewhat less certain of complete originality … Continue reading

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Post a Day

john hare In helping Jon complete the post a day for a month celebrating 10 years of selenian boondocks, I found I’m not very good at nonspontaneous writing. When I have an idea that I’m passionate about and I write … Continue reading

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