And what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
I'm familiar with wind tunnels, and don't think that fan is for one. All I've seen have individual, removable, blades. If not, you would have to build the tunnel around the fan.
Looks as if I was wrong and it is from the AERL tunnel, as the next post says. If you look closely at the pic, you can see each blade has a pie shaped segment at the hub, so they are individual. You balance them by making each one as close to the same weight as possible, and then when installed you use the lift pumps on the shaft to see if it's imbalanced. They don't spin as fast as you might think, hundreds of RPM, not thousands.
Looked up AERL it is part of a research center now NASA Glen Research center. The fan is located in the "Supercharger Building" go here and see the fan but it looks like there are 2 fans https://www1.grc.nasa.gov/historic-facilities/altitude-wind-tunnel/awt-publications/
Wind-tunnel fan maybe?
ReplyDeleteThat's what google shows for that picture.
DeleteWould this be cast or fabricated?
ReplyDeleteLooks like each blade is machined??
Deletethinking cast then seriously brought to specs ...but **warpage**
DeleteI'm familiar with wind tunnels, and don't think that fan is for one. All I've seen have individual, removable, blades. If not, you would have to build the tunnel around the fan.
ReplyDeleteHOW in the world would you balance that thing?
ReplyDeleteLooks as if I was wrong and it is from the AERL tunnel, as the next post says. If you look closely at the pic, you can see each blade has a pie shaped segment at the hub, so they are individual. You balance them by making each one as close to the same weight as possible, and then when installed you use the lift pumps on the shaft to see if it's imbalanced. They don't spin as fast as you might think, hundreds of RPM, not thousands.
DeleteLooked up AERL it is part of a research center now NASA Glen Research center.
ReplyDeleteThe fan is located in the "Supercharger Building" go here and see the fan but it looks like there are 2 fans https://www1.grc.nasa.gov/historic-facilities/altitude-wind-tunnel/awt-publications/
AERL unfortunately demo'd to make room for new Icing Research refrigeration bldg. about 8 yrs ago.
ReplyDeleteSorry, demolished 2009 https://history.nasa.gov/SP-4319.pdf
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