Vintage Windmill and Wind Generator Forum

I attempt to pick up any reasonable Aermotor produced literature when I run across it. The recent acquisition was a Nov 1929 parts price list. I always something interesting...

Below are the three illustrations in it. There are three parts shown in the illustrations that are commonly referred as 702 model type but here they are 4 years before the 702 and they have a part number that starts with a 6__ as Aermotor used the first number to identify the model when the part was introduced.

So I looked at 4 different Aermotor advertisement and illustrations for the "New Improved 702 Model" and these three parts are not brought up. The rational conclusion is that these parts were brought on board with the 602 when they are shown in a Nov 1929 catalog. I have seen too many 10' B602s configured like this that I considered still original. Since 10' turn at a slower RPM and last longer, these heads had never been taken apart or rebuilt.







I think the reason you dont see a lot of these 602S with "702" parts is because this was the start of the Great Depression and not as many mills sold. Also, most 8' 602s would have been apart and rebuilt by then so the originality compromised. Any of the 10' 602s I have seen with dates after 1930 have had these "702" parts on them.

To the equally observant, what are the three parts I am talking about?

Ron Stauffer
Montrose CO

The first pic down has two and the second pic one of the "702" parts in the Nov 1929 Price List of Parts.

Two "702" parts in the first pic are the tail bone with the angle iron strut. The second "702" part is not as easy to see and is the wheel section. If you look close you see it has a rolled edge rib and would be a 2 rivet wheel.

The second pic has the 624 pump rod yoke that takes "702" style pump rod with a pinned top versus threading in.

This Price list makes no mention of any upcoming introduction of the 702 model since it is 4 years before introduction. By appearances, Aermotor did these design improvements as just part of an upgrade in design and not explicitly for the 702.

Any Aermotor advertising I have encountered for the "Improved 702 Model" never mentions the angle strut tail bone, 2 rivet wheel or pinned pump rod. They do mention the hub with threaded arms.

There are some Aermotor parts that were given new numbers when there was a design change but not so in others. Take for example, the 659 tail bone. It has three distinctive designs in each pic but has the same part number? Then there is the 586 and 786 brake arm that has different part numbers but no distinguishable difference.

Some time between the late open gears and early 602s was a very slight design change in the individual wheel section. Early ones if not assembled in a clockwise overlap would have weakness. Later wheel sections could be assembled CW or CCW without issue.

I had seen enough of the late 602s with original angle strut bone, 2 rivet wheels and 624 yoke to wonder why. This Nov 1929 Parts list sheds some light. I am open to any literature out there that others have for differences and/or affirmations as I dont have an all inclusive Aermotor literature collection.

There is an "over priced" July 1935 Aermotor price list on ebay that I would like some info out of if someone in the forum buys it...
https://www.ebay.com/itm/175583571503?_ ... %7Ciid%3A1


Ron

Is it this one Ron that's on eBay?

No, that is not the one.

Aermotor did annual descriptive catalogs and less frequent price lists and other literature.

The info from the July 1935 Price List that I am looking for are - price differences from the May 1938 to assess Great Depression impact and to see if there is mention of the E & F 703 1/2 hub in it. I have only run across a handful of early E & F 702s that had a 703 hub with 536 arm. All of them fell in the 1933 - 1938 manufacture. Aermotor carried forward the 503 look in to the 703 hub using the 536 arm. It was just the look of the hub as it had to fit the 1/8 larger OD of the 702 main shaft and mate the 702 case. The only thing same from the 503 to the 703 was the heavy outer lip and the closed bottom threading for 536 arms. I have an E & F 703 here and Jerry Barker has an E703. I call it a 703 because the catalog does, I have never seen a E or F 703 hub with part number cast in it. By appearances, the 703 was around for five years and then replaced with E & F 703 1/2.

Is this the one it's date is 7-35.

Yes that is the same one that was on ebay. Before you sell yours, shoot me these pics please.

If organized the same, you will have illustrations first, followed by 602 part, followed by 702 and tower parts last.

8' 702 main frame - just want for price comparison


14' E702 hub group (guessing it will just show the 703 hub and 536 arm unlike this 1938 price that also has the 703 1/2 hub and 736 arm)




If your catalog has the 703 1/2 hub, it would also have 736 arm in wheel and arms group. I dont think you will see them tho - 703 1/2 and 736

In case my PM didn't go through.

I have a copy of the 1935 price list that I got from Stan Anderson. If there is specific info you need out of it let me know.
Gregg