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#1
05-23-2010, 09:10 PM
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help designing Saturn V reducer?
I am building a ~1:17.6 scale model of a Saturn V using 55 gallon metal drums as the main rocket booster. I know what I am building isn't exact and the details won't be technically accurate, but that isn't why I am doing this. I just want a close approximation to display outside my shop.
Anyway, I am wondering if anyway can tell me how, or point me in the right direction, to design the reducer section between the 2nd and 3rd stages and the lunar module. Here is what I figure for dimensions: 2nd to 3rd Stage Reducer = 13.63" tall x 22.5" to 14.794" diameter Lunar Module = 19.09" tall x 14.794" to 8.75" diameter While an answer to this specific problem would be great, I would also like to know the how of solving this so I can do it myself in the future. Thanks... 
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#2
05-23-2010, 09:50 PM
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Are you good at math? Software can be used to draw small transitions, but you are going to need to make a big one. Unless you have a huge plotter for printing, the usual software template makers won't help you.
This PDF shows the math you will need to draw out a transition section by hand. http://www.rocketshoppe.com/info/Transitions.pdf
__________________
I love sanding. 
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#3
05-24-2010, 12:29 AM
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Wow! That is a lot of math! I'll have to print that out, but I think I can use it. I found this:
http://www.rocketreviews.com/tool_shroud.shtml Would the number it gives work for what I am doing? This is what it spits out using the dimensions of the 2nd-3rd stage reducer: small radius = 27.192331020340966" large radius = 41.35645856142164" angle = 97.92908147550969 degrees I may try that first before trying to figure the math out from that paper. Thanks again.
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#4
05-24-2010, 06:54 AM
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If you can open Excel files, this one gives the dimensions of both transitions, plus shows the math involved. You can use the spreadsheet to calculate any transition you want - just plug in the length, large and small diameters. The shaded area gives the outside and inside diameters (you have to be able to draw very large circles or arcs) and the length of the arc for the transition.
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#5
05-24-2010, 08:42 AM
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Quote:
That looks about right. I gave you the link to the math because I thought you wanted to know how it was done. When you finish your project, post a photo or two here. 
__________________
I love sanding.
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#6
05-24-2010, 11:21 AM
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Quote:
Oh no... I do want to know how. I am fixing to print out the sheet you linked to and I am going to study it. There is just a lot more math involved and it is going to take me a minute to figure it. The reason I asked about the online calculator is just in case I can't figure this out. This project is going to take a while - I've been trying to get the barrels for several months already and I just got them a few days ago. I will post photos when I get done, though...
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#7
05-24-2010, 11:25 AM
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Quote:
That looks good. Thank you.
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#8
05-24-2010, 11:53 AM
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Derek,
Given that a 55 gallon drum is 22.5 inches in diameter, the following holds for the Aft Interstage Structure (S-IVB): Object________Actual______Scale -----------___------______----- Len._____________228______12.955 Dia. Top_________260______14.773 Dia. Bottom______396______22.500 A Saturn V of this scale will be about 20 ft 7.50 in height. Greg
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#9
05-24-2010, 12:06 PM
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Quote:
Yeah, that's pretty close to what I came up with give or take half an inch. And yes... 20 feet is understood. This is just for show...
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#10
05-24-2010, 12:53 PM
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Derek,
This is what I get for the SLA (Spacecraft-LM Adapter, aka LEM Shroud): Object________Actual____Scale -----------___------___------ Len._____________336___19.091 Dia. Top_________154_____8.75 Dia. Bottom______260___14.773 Greg
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