MAGIC MUFFLER Posted May 23, 2018 Share Posted May 23, 2018 I have a real Crackerbox Racing Boat that is 14 ft long. There is a model I want to build that is 14 inches long. I want to build a motor for this model ( Flathead ) then what scale motor would I look for to build???? Thank you, Any help on this appreciated. Quote Link to comment Share on other sites More sharing options...
Miatatom Posted May 23, 2018 Share Posted May 23, 2018 1/12 Quote Link to comment Share on other sites More sharing options...
MAGIC MUFFLER Posted May 23, 2018 Author Share Posted May 23, 2018 Awesome!!! Have no idea how you figured that out. Thank you Quote Link to comment Share on other sites More sharing options...
BigTallDad Posted May 23, 2018 Share Posted May 23, 2018 (edited) 14 minutes ago, MAGIC MUFFLER said: Awesome!!! Have no idea how you figured that out. Thank you comment deleted Edited May 23, 2018 by BigTallDad Quote Link to comment Share on other sites More sharing options...
Spex84 Posted May 23, 2018 Share Posted May 23, 2018 If the full-size boat is 14ft long and the model is 14 inches long, that means every inch of the model is equivalent to a foot in the full-size boat. A foot is 12 inches...so that's "one to twelve", or 1:12. 168" 12" _____ divide each by 14= ______ 14" 1" Quote Link to comment Share on other sites More sharing options...
MAGIC MUFFLER Posted May 23, 2018 Author Share Posted May 23, 2018 Fantastic!!! Learn something new everyday! Really appreciated and thank you my Canadian friend as I'm from Canada as well but living in California. Cheers Bill Quote Link to comment Share on other sites More sharing options...
Ace-Garageguy Posted May 23, 2018 Share Posted May 23, 2018 (edited) 42 minutes ago, MAGIC MUFFLER said: Fantastic!!! Learn something new everyday! Any "scale" is simply an expression of what fraction of the size of the real anything a model of it is. For instance, 1:25 scale is the same as 1/25 scale, and they both mean that the real thing in question is 25 times larger than the model. All other scales work the same way. Let's say you have a model and you don't know what scale it is. Measure its length in inches. Then google the length of a real one, in inches (or in your case, as shown above, multiply the length of your real boat in feet by 12 to get its length in inches, 14 X 12 =168). Divide the real dimension by the length of the model (or in your case, the length of the model you want to build, 14 inches). You'll get a number. Put a "1" over it in a fraction, and you now know the scale. 168 divided by 14 = 12. Your scale is 1/12, or 1:12. Now, let's say you wanted to build a model of your real boat in 1:25 scale. Take the length of the real one again, 168 inches, and divide by 25. You get 6.72 inches, so that's how long a 1/25 or 1:25 scale model would be. Edited May 23, 2018 by Ace-Garageguy Quote Link to comment Share on other sites More sharing options...
peteski Posted May 24, 2018 Share Posted May 24, 2018 This is where this grade-school level math comes in handy. The stuff we didn't think we'll ever use. Quote Link to comment Share on other sites More sharing options...
Miatatom Posted May 25, 2018 Share Posted May 25, 2018 On 5/23/2018 at 9:57 PM, peteski said: This is where this grade-school level math comes in handy. The stuff we didn't think we'll ever use. So true. I was a miserable math student in high school, flunking Algebra II but managed to pass calculus in college. Go figure. Never saw the need for math in my adolescent years but I learned netter later. I've really used it a lot building and racing 1 to 1s and model cars too. I learned as an instructor at a nuclear plant for a student to "get it", you've got to relate it to real life. Doesn't matter what you're teaching. Quote Link to comment Share on other sites More sharing options...
Ace-Garageguy Posted May 25, 2018 Share Posted May 25, 2018 8 hours ago, Miatatom said: So true. I was a miserable math student in high school, flunking Algebra II but managed to pass calculus in college. Go figure. Never saw the need for math in my adolescent years but I learned netter later. I've really used it a lot building and racing 1 to 1s and model cars too. I learned as an instructor at a nuclear plant for a student to "get it", you've got to relate it to real life. Doesn't matter what you're teaching. I agree heartily. Though I was fine with everything through algebra, I struggled with calculus my first quarter. The instructor was a pure-math enthusiast, and had little interest in helping us grasp how it could be applied to real-world problem solving. Once I understood how it could be used as a tool, everything changed. Quote Link to comment Share on other sites More sharing options...
Miatatom Posted May 26, 2018 Share Posted May 26, 2018 12 hours ago, Ace-Garageguy said: Once I understood how it could be used as a tool, everything changed. That light bulb moment! Quote Link to comment Share on other sites More sharing options...
Chariots of Fire Posted May 28, 2018 Share Posted May 28, 2018 That's why I model in 1/25 scale. Since there are 25.4 mm in one inch, using a metric ruler is pretty well on the mark. That 0.4mm doesn't really make that much difference for most of what we do so to make things easy use a metric ruler and for every full size inch call it a millimeter. A 145" wheel base in real life would be 145 mm! Quote Link to comment Share on other sites More sharing options...
SSNJim Posted May 28, 2018 Share Posted May 28, 2018 A wheelbase of 145" would actually be 147.32 mm in 1/25. Calling an inch one millimeter works fine for smaller measurements but for larger measurements the 1.5% or so difference starts to add up. Quote Link to comment Share on other sites More sharing options...
Bainford Posted May 29, 2018 Share Posted May 29, 2018 A more accurate method of scaling when working in 1/25 scale is using .040" to represent 1''. This makes the math easy when scaling parts; .020" = 1/2 inch, .010" = 1/4 inch, .005" = 1/8 inch, etc. .080 = 2 inches, .120" = 3 inches, etc. It makes for an excellent scaling method when scratchbuilding. Quote Link to comment Share on other sites More sharing options...
Ace-Garageguy Posted May 29, 2018 Share Posted May 29, 2018 21 minutes ago, Bainford said: A more accurate method of scaling when working in 1/25 scale is using .040" to represent 1''. This makes the math easy when scaling parts; .020" = 1/2 inch, .010" = 1/4 inch, .005" = 1/8 inch, etc. .080 = 2 inches, .120" = 3 inches, etc. It makes for an excellent scaling method when scratchbuilding. That's a good rule-of-thumb to put on a sticky note in plain view over the bench. Quote Link to comment Share on other sites More sharing options...
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