NemVia
Well-Known Member
Scratch Building 2 of Chicago's Defunct Icons at the Same Time
I've spent most of my life building various kit models from boats to race cars to funny cars and dragsters and even Starships. Building some of these models from scratch has been an enjoyable experience for me because I can custom make all of the parts for the project. For years I've wanted to start this next project, but the lack of information and photos and building materials was the big factor in delaying the start. Since the internet has come into existence, many more people have been willing to upload their personal photos and home movies to allow many different people to enjoy what they once experienced. The types of building materials have also changed and are more accessible to the lowly hobbyist, like me, in local hobby shops or buying direct from certain manufacturers directly on-line. This time, though I wanted to build something that was special to me. It was something that many Chicagoans knew of up until 1967 when it was removed altogether from existence. I was never old enough to ride it, but I could see it right from my bedroom window day or night. It was just one of those things I will always remember in my mind and heart. I am of course speaking of Riverview's Pair-O-Chutes ride. A six-parachute freefall ride from atop a 210-foot tower. Something that many modern B.A.S.E jumpers could have gone on legally and with complete safety.
But this ride was not always the Pair-O-Chute jump that many remember.
In 1910 the ride opened up as the "Eye-Full" tower. A tongue in cheek name adapted from of course the Eifel Tower in Paris France. Its function was that of an observation tower in which individuals could be lifted up the center of the tower via a pneumatic elevator system to a glass enclosed 360-degree viewing platform of the city hence the name "EYE-FULL". What a shame it is that no one thought to bring one of the early cameras up there to take some awesome pictures of the surrounding area. As it turns out though, the city of Chicago felt that pneumatic elevator system was entirely unsafe and so the ride was shut down until a safer elevator system could be installed. Later a more traditional cable and counterweight system was installed, and the attraction was reopened. The tower remained open for a few more years and was then closed down once again and it stood until it was decided to add the spans on the tower and make the first free-fall parachute ride at an amusement park.
Same tower, different function. I was 4 years old when they tore the park down and I remember how just that summer before my mom promised me when I was old enough, I could go on that ride as many times as I wanted. Of course that could never be. But I never stopped thinking about the ride. As I got older, I began building models from cardboard and other materials. I began to build some of them solely from drawings and blueprints. I knew that one day I would find the materials I needed to build a replica of this tower. I found pictures of all kinds on the internet including a model of the Pair-O-Chutes that was built by a former employee of Riverview out of brass. I have to say, I can't stand working with brass, but he did give me the push I needed to start doing research on my own build. At first many of the pictures I found of the tower were not detailed enough for me to figure out how it was constructed. This was the case until I met another former employee of the park who actually operated and maintained the ride. I took a chance and wrote to him, and he did respond about a month later. He sent me some higher resolution copies of photos that he actually took while on the tower. Views that I had never seen before that revealed that the tower was basically made from steel angle-iron and steel rods. I found some professionally made documentaries from news reels online and saw even more of what I needed to finally begin my project.
But what do I build it out of, and how large would it be? I knew that some hobby shops had copper piping and steel rods and even brass stock for building certain items. But what I didn't find was any angle-iron or angle shaped metals. I suddenly remembered there was another perfect source of materials in plastics. Evergreen Styrene products was the way to go. They had all different sizes and shapes of what I needed to at least start building prototype pieces. At first, I wanted to build a tower at 1" = 1' which would have made the tower over 17' tall. I really didn't have the room for that even in our yard. So, I whittled it down to a 6-foot model.
So, the first "Icon" I am building will be the "EYE-FULL" part of the tower. There was a lot of guess work in the slope of the outside part of the legs. The final product was achieved by building the inside part of the leg and then taping it to a support pole I have in my basement. Then I built the outside part of the leg and taped the two ends at the top together, then I mounted a cut-out of the tower on a mic-stand and placed it at a distance to where I could view it with one eye and the built parts of the leg with my other eye. I taped the bottom of the outside leg to a book and kept moving the book away from the base of the other leg until it appeared to match what I was seeing with my other eye on the picture. I literally eye-balled the leg to build it as close to the original as possible. Next, I measured off 17 tiers on the inner leg including the very top of the tower leg. I took a small level and held it at each of the marks on the leg and measured off each of the widths up to tier 13.
I needed to build 12 of these support legs. So, I took an old piece of drywall, a 6' piece of aluminum c-channel and a bunch of clamps and pushpins and I drew a template on the drywall so that all of the legs would be built exactly the same height and width. Next, I needed to find out the distance that the tower's interior parts of the legs would be from each other, so I taped two of the legs to my basement wall and used my cut out of the tower again to figure what the space was. Each leg was 11" apart from its immediate opposite. In order to build this tower as circular as possible I bought a 10" concrete form; I measured on the outside of the form 12 segments from top to bottom around the entire tube and then I cut 12 - 1/2" strips to make up the 11" and taped all 12 strips to the outside of the tube. Next, I taped all of the legs in place to make sure they would stay centered as I began adding all of the bracing rods starting from the inside leg and working outward.
Here you can see the inside led cross bracing in place. I also had to add 2 more inches to the bottom of the tower legs because I found a very rare arial photo of the tower that shows the bracing on the lowest tier. To make it easier to paint all of these intricate parts I first painted all of the legs one at a time. Next, I sprayed all of the bracing rods except for the ends so that I can cement everything in place.
I've also started the horizontal cross-bracing. After I get this finished, I will add more horizontal rods to the outer parts of the legs and then I can touch up the exposed white parts of the bracing rods. A pretty cool note: Before I added the horizontal bracing, the outer parts of the legs would wobble when I would lightly bump them, but now that they have this bracing in place the legs are very sturdy. I was a bit worried about the strength of the structure because eventually I will have to remove the concrete form and the wood strips so the structure will be free-standing and sturdy. My fears have now abated. I do have to order more rods for the bracing, but after the entire tower is done, I can begin to build the second Icon which will be the PAIR-O-Chutes arms. Please feel free to ask any questions about the build and if there's any additional details you think I could add, please let me know as well. Thanks for reading!
Building the Pair-O-Chutes Tower (Part II)
https://www.linkedin.com/in/mark-nehmzow-934b8158/So, I've built as much as I can build for the Eye-Full Tower segment of this project. The picture below shows how far along it is. NO! This is not the world's tallest salad bowl holder. The bowl is used to keep the tops of the legs equidistant all around until I get all of the bracing rods in place. There is also one tier without the cross bracing attached to it. This will allow me to get my hands into the structure to hook up the Parachute arms and pulleys for later on. After that is in place I will add the cross braces and crown to the top of the structure.
Below is the tower without the inner core and the bowl. I was very happy when I could see how the tower supports its own weight. The blue tape is there to remind me where I'll be adding a few ground structures by the base of the tower. You are actually facing the South side of the tower at this point.
[This is what the Eye-Full Tower might have looked like in the 1900's]
This mode is being built almost entirely based on available photographs on the net. However, I have managed to find an actual blueprint of the tower arms that I'm using for reference as well. The blueprint labels all of the trusses by letter (i.e. Truss "A", Truss "B", etc.) and also has side views of each of these trusses so I'm able to see clearly how each truss was built. The picture below shows trusses "A", the longer truss and trusses "E" the smaller cross truss. The pictures I have also show a series of catwalks and other support structuring which I've added to these arms. There are six arms in total.
[Center Truss "A"]
Here is a close-up of one of the tower arms. I purchased some brass grating for the catwalks. I will add what looks to be like laughable safety railings later on. I'm still searching for some better pictures of the railings.
[Truss "A" and "E" with the catwalk grating added]
In order to make the arms equidistant from each other I needed to make four "F" trusses. This will give me the proper spacing between the arms.
[Truss "F"]
The trusses are now in place on this side of the arms. I've taped everything in place so nothing would move while I'm building the arms.
[Truss "F" connected to the 2 "E" trusses]
This is going to be the East side of the Tower. I have all of the trusses A - F in place. They make the structure quite sturdy. I will now begin on the West side arms. I'm waiting for some materials before I can finish. After all of the trusses are in place I will build all of the safety railings and add them to all of the catwalks. I also need to add four more sections of catwalks to each of the "F" trusses, but I need to turn the model upside down to add the supports to the underside. But, it seems to be coming along fine for now.
[Trusses A - B - C - D - E - F in place]
I am looking for some 13mm 6 spoke cable pulleys scaled to this build. If anyone knows who might be able to produce them for me, I would like to buy them. They would have to be functional. I'll probably need 18 to 20 of them. I don't have all of the specs for them figured out yet, but they would need to added to the underneath of the A and E trusses later on. Just putting some feelers out.
Nearly 100% of this build is taken directly from available Videos and Photographs as well as tips and suggestions from an ex-park employee who operated this particular attraction. A few areas I'm building are based on an actual blueprint of the Tower Arms. The tower itself, minus the flagpole, is about 212 feet tall which makes my model about 1:35 scale. Right now I'm working on some lesser seen details. For instance, at the top of the tower there is a structure of which I will be referring to as the "CROWN" because it sits atop of the tower itself.
This is the only picture I've ever seen of the tower TO
Here the Crown is just resting on top of the Tower Legs. It does align up perfectly with the legs. It will be permanently added to the structure later on in the build.
Here is the Crown after Painting.
Again, it is just sitting on the top. As you can see there are other parts of the tower that need painting. This will happen as I add the additional cross bracing rods on the top tier later o
Base of tower graphic by Frank Lurz
The Mounting Base and Motor House
If you look closely at the first full picture of the tower you will see on the inside bottom of the tower legs a small building which is the manager's hut. This structure connects to a storage and motor house in the exact center of the base. This inside structure housed the winch motors as well as replacement parachutes, cable guide equipment and other parts and tools. I know this looks suspiciously like the beginnings of the bridge of the U.S.S. Enterprise but it will instead be the mounting base for the inside tower legs. It will help stabilize them and hold the tower firm and keep it from swaying. It will however house the motors that I will be using for the parachutes except that the motors will be mounted underneath the structure for maintenance purposes and ease of access in case something breaks down. The hole is for running the tow cables through the structure.
This second floor is for the "Walk-Around" as indicated on the graphic up above. Well, that's all for this update. Your comments are most welcome. See you in another month or so.
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