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Oddball?
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James McGhee
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Joined: Tue Sep 29th, 2009
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 Posted: Fri Oct 2nd, 2009 01:08 am
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This is my first post; lots of great info here!  I have the opportunity to get this fan, and I can't seem to find any information on it.  It is a Robbins & Myers DC model 3900, and is supposedly a 19" blade.  Anyone know anything about it?

Tom Dreesen
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 Posted: Fri Oct 2nd, 2009 01:28 am
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19 inch?  I doubt it.  16 inch blade maybe, larger cage, but 19 is too large even for the cage.

James McGhee
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 Posted: Fri Oct 2nd, 2009 01:42 am
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I suspect it's 16" and the overall height is what the gal selling it actually gave me.  I can't find that model number anywhere though...

Steve Stephens
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 Posted: Fri Oct 2nd, 2009 05:52 am
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James,
If you could post a photo or two of the fan it would help us know what it is. Steel cage? Brass or steel blade? Three speed? I may have seen one but, like most of us, don't know R&M's numbering system too well on later, post-1920 fans. DC won't be a problem as you can install an inexpensive rectifier to run the fan on AC.

James McGhee
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 Posted: Fri Oct 2nd, 2009 09:02 am
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Here's the two pics I recieved from the seller.  I think it's a great looking fan, I'd just like to know more about it.

 




Randy Rohr
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 Posted: Fri Oct 2nd, 2009 09:23 am
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James,

I have a #2500 which is similar except that it is 12 inch and 110 VDC. You will need a 32VDC power supply to run this and it will put out plenty of air. 32 volt fans were built to run off auxillary generators in remote locations- farms, navy ships, trains, etc. Speed control is via a pair of power resistors in the base, likely still good in this application.

Good luck,

Randy Rohr

Steve Stephens
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 Posted: Fri Oct 2nd, 2009 05:05 pm
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Well, that LOOKS like a common style 16" oscillator from the 1920s although being a DC would make it unusual. I think these are good fans with an easy to adjust oscillator wheel. Make sure the motor sits reasonably tightly on the base at the neck connection or place where the fan swivels during oscillation. I've had them that flop about which could be wear and I don't know if that's easily fixable. The fan's finish could use some restoration/re-do.

Do you see the small void right above the motor tag? Could someone have buggered up the case at one time in opening it up? How little are they asking for the fan?

Last edited on Fri Oct 2nd, 2009 05:07 pm by Steve Stephens

Russ Huber
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 Posted: Fri Oct 2nd, 2009 05:33 pm
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Is it just me... or is that a G.E. blade on Jame's fan? :wondering: If so, I have a nice 16" 4 wing R&M brass blade for it. I would be willing to swap you blades "IF" I am right. :wondering:

Last edited on Fri Oct 2nd, 2009 05:35 pm by Russ Huber

Tom Dreesen
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 Posted: Fri Oct 2nd, 2009 11:27 pm
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Well Steve, I can't speak to the base, but those motor bolts sure don't look to be original, so someone has been into the fan at some point.

Ron Powell
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 Posted: Sat Oct 3rd, 2009 03:10 am
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Tom, I agree, someone has even painted it with a brush. GE blade, extra long motor housing studs, and hand painted ta boot, I'd be very careful touching this one. I would not be surprised if it wasn't a DC fan anymore either.

Nicholas Denney
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 Posted: Sat Oct 3rd, 2009 03:25 am
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Blade is correct.

Ron Powell
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 Posted: Sat Oct 3rd, 2009 01:36 pm
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Even with the correct blade I'd be very cautious of this fan Nick. I just don't like fans that have had someone else's fingers busy in them. They can be more problems then there worth.

Steve Stephens
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 Posted: Sun Oct 4th, 2009 04:35 am
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I think the blade may be correct but the fan could very well have a host of problems. Not only will you have to put a rectifier in the base but you'll need a Variac to run the fan at 32 v. more or less. Once you get into the fan and/or start cleaning, restoring, etc. you may find a number of other problems...or not. I don't think it's worth the risk unless you love a challenge and are capable of doing the work yourself. I've seen a number of fans bought fairly cheaply that needed all sorts of work and parts. By the time they are fixed and the parts added you could have bought a nice original fan with no or few problems for less money. Buy the best you can afford and, if you can't afford a decent fan, save the money. Fewer, nicer fans will make a better collection. I'd pass on that fan; it looks like it's had a rough life.

Nicholas Denney
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 Posted: Sun Oct 4th, 2009 05:07 am
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Steve Stephens wrote:  I've seen a number of fans bought fairly cheaply that needed all sorts of work and parts. By the time they are fixed and the parts added you could have bought a nice original fan with no or few problems for less money. Buy the best you can afford and, if you can't afford a decent fan, save the money. Fewer, nicer fans will make a better collection. I'd pass on that fan; it looks like it's had a rough life.
If everyone had that philosophy, there might be a lot more fans in the landfill and a lot less in here!

Delmar Crickmore
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 Posted: Sun Oct 4th, 2009 05:31 am
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hope nobody plugged it in being 32v dc!
poof!
even if its a franken fan if its cheap grab it.

Ron Powell
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 Posted: Sun Oct 4th, 2009 02:10 pm
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Nick, If you want to buy one like that, go ahead. No ones stopping you. It's just that some of us can't afford to have a money pit of a fan nor do we need the headaches. I'm sure it would make a half way decent parts fan. I myself haven't that kind of money to buy a parts fan that I have no use for now.

James McGhee
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Joined: Tue Sep 29th, 2009
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 Posted: Mon Oct 5th, 2009 05:54 am
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Thanks for all the info guys!  I'm going to look at it and a couple of others on Friday, but I'll probably wind up passing on this one.  I've got to say, I'm a regular member of a number of different forums, and I've never seen/ gotten such a warm welcome.  Most forums people are at best cryptic, and at worst nasty when someone new shows up with questions... you guys seem to be quite the opposite!  Thanks again!

Steve Stephens
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Joined: Mon Nov 14th, 2005
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 Posted: Mon Oct 5th, 2009 06:14 am
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James McGhee wrote:
I'm going to look at it and a couple of others on Friday...
That makes you almost a bonafide fan collector. Dues to the AFCA are $50 and the benefits are great and friendly and fun. Think about joining for next year and making a great big collection of old fans.

I started with one and now am seller one by one to make room for my cats and me in the house AND to buy more fans. Check back if you want any more help, advice, money...
Did I say money? Well, that's on you.


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