Mariner 2 did its fly-by past Venus.
There are fewer and fewer people who can remember the days when all humanity could do was to look out at the cosmos and wonder what was out there.
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Monday, December 14, 2015
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My take from this is that we had working solar panel tech. that far back. I guess oil was a 'forever' thing back then but why has it taken 50 plus years to get solar tech to "the people"?
ReplyDeletew3ski
Not doing any research, I'll bet that the cost of solar panels in 1961 was north of $1,000/watt in `61 dollars. These days, it's below a buck a watt in today's money.
ReplyDeleteBest data I can find:
ReplyDeleteMariner series costs $554 million for 10 units.
Mariner 2, maximum watt output during encounter (Venus) was 270 (wiki says 220, but NASA/JPL data from 1971 says 270) from one of two panels (the second, slightly smaller, panel failed completely about 2.5 months into the mission). Pre-mission testing provided a peak output of just 200 watts, but the data was not clear if that was just the one panel, or both, at that time. The peak encounter wattage was from a single panel of roughly 1.39 sq/m. This remaining panel was able to supply enough power to keep all the scientific instruments running at that time due to proximity to the sun. Total panel size was 2.69 sq/m, with an efficiency of 5.5%.
Since Mariner 2 was the second of ten units, all with similar construction, but the later units bearing improvements, we can ballpark the cost around $35-40 million. However, these costs include hardware and launch, so there is no way to figure the cost per watt...but I suspect that Comrades estimate (with a resulting "cost" of about $200,000) is low. Correcting via CPI, 1962's $200,000 is about $1.6 million today.
Re-read, missed the "north of", apologies Comrade. Also slipped and used '62 vice '61.
ReplyDeleteTo answer w3ski's excellent question:
ReplyDeleteTwo words. "Semiconductor processing". More words: the processification at large volume of silicon wafer manufacture is the cost driver. --wb4irp