It is 59"x7" and I think made of aluminum. Any ideas or pointers would be great. I bought it at a flea market.
Serial number (?) http://tinyurl.com/26ullh
Overall shot http://tinyurl.com/2xodga
Patent # http://preview.tinyurl.com/yt4jgs
2007-10-02 19:17:58 · 10 answers · asked by brett lider 1 in Cars & Transportation ➔ Aircraft
This is not an aircraft prop. It is an airboat prop.... like the one on mine... the center hole is typical of an airboat. Go to classicairboats.com and you can look at it. It is not a production model, as it is not plated. This is for a low speed low cost airboat. You could get maybe $100 off a collector.
2007-10-03 12:19:44 · answer #1 · answered by Dport 3 · 0⤊ 0⤋
The numbers (59” X 7”) mean that the prop is 59 inches long and with 100% efficiency (no slippage) moves 7” with each rotation. Considering a fairly normal redline of 2700 RPM & 100% efficiency, that says that the attached airplane will go almost 18 mph.
2700 RPM * 7 in/rev = 18,900 in/min
18,900 in/min / 12 in/ft = 1575 ft/min
1575 ft/min * 60 min/hr = 94,500 ft/hr
94,500 ft/hr / 5280 ft/mile = 17.9 mph
Then you could calculate the how many RPMs are maximum to keep the tips under the speed of sound and use that for RPMs and recalculate, but I will leave that to you.
That propeller didn’t propel an airplane that flies ….
2007-10-03 02:31:49 · answer #2 · answered by pitts_pilot 3 · 1⤊ 1⤋
First off, it is not an airplane propeller, because no airplane propeller is secured in the manner of this blade. All airplane props are bolted to the crankshaft via a flange on the crankshaft.
The patent number is a British patent that was renewed for another 5 years 22 Dec, 1999.
Now here is another quote I found that confirms my suspicion that is a ventilation fan: PAT # 2043736. It's a patent for ventilation fan blades . ... The URL is flickr.com. I know you posted it there also. Did you not believe the person there who told you what it was?
the patent was also renewed 22 Oct 2004 for another 5 years, so apparently it is not old or rare.
2007-10-03 10:12:31 · answer #3 · answered by eferrell01 7 · 0⤊ 2⤋
I don't think it actually came off of a plane. I googled the patent number and came up with the website shown below.
I think you have a prototype manufactured for the purpose of demonstrating the value of that patent.
I didn't understand the value of this acoustical accommodation, noise reduction maybe?
You might have a valuable piece of history or you might have a piece of aluminum for selling to a scrap dealer. Good luck.
2007-10-02 20:42:21 · answer #4 · answered by plezurgui 6 · 0⤊ 0⤋
The shaft hole looks very small. It could be a fan blade for a wall mounted exhaust fan. Sorry.
2007-10-03 13:28:45 · answer #5 · answered by billy brite 6 · 0⤊ 1⤋
Not a plane, an airboat
2007-10-03 10:34:59 · answer #6 · answered by POPEYE 3 · 1⤊ 0⤋
looks like it came off an airboat, though most use wooden props
2007-10-03 04:58:29 · answer #7 · answered by Mike Tyson 3 · 0⤊ 1⤋
looks similar to what you would find on a Convair 580.. its not exactly the same though..
2007-10-03 10:15:24 · answer #8 · answered by Kevin H 3 · 0⤊ 1⤋
What difference does it make? You bought a prop. You have no idea what it fits. And now you need help trying to find out what to do with it. Who cares what it fit ? Mount it on the wall and get over it. You bought it, now do something with it. Why the hell would you buy something with no practical purpose?
2007-10-02 19:36:34 · answer #9 · answered by Anonymous · 0⤊ 7⤋
think airboat !!
2007-10-04 14:43:05 · answer #10 · answered by tbone19622 2 · 0⤊ 0⤋