# geometric similarityWatch

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#1
in this question , Lm / Lp = 1/ 6 ? or Lp / Lm = 1/6 ? Lp = length of prototype , Lm = Length of model

i really have no idea... can someone help please?
0
2 years ago
#2
(Original post by wilson dang)
in this question , Lm / Lp = 1/ 6 ? or Lp / Lm = 1/6 ? Lp = length of prototype , Lm = Length of model

i really have no idea... can someone help please?
Lm/Lp = 1/6
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#3
(Original post by natninja)
Lm/Lp = 1/6
can you explain why are you so sure that Lm/Lp = 1/6 ????
0
2 years ago
#4
(Original post by wilson dang)
can you explain why are you so sure that Lm/Lp = 1/6 ????
because the model is obviously going to be smaller
0
#5
(Original post by natninja)
because the model is obviously going to be smaller
Do you mean the model can be only smaller, and can't be larger than prototype??

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0
2 years ago
#6
(Original post by wilson dang)
Do you mean the model can be only smaller, and can't be larger than prototype??

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Yes. The idea is to have a smaller model because it's cheaper, easier to make and fits in a smaller wind tunnel. There is no reason why the model would be larger - if you could build a larger model, you'd just build one the correct size.
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#7
(Original post by natninja)
Yes. The idea is to have a smaller model because it's cheaper, easier to make and fits in a smaller wind tunnel. There is no reason why the model would be larger - if you could build a larger model, you'd just build one the correct size.
I also encounter the same question which the ratio is in terms of a:b , where a is larger than b ,
Let's say a is 5, b is 1 , does it also mean Lp/Lm is 5???? Since you said that the model must be smaller than prototype?

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0
#8
(Original post by natninja)
Yes. The idea is to have a smaller model because it's cheaper, easier to make and fits in a smaller wind tunnel. There is no reason why the model would be larger - if you could build a larger model, you'd just build one the correct size.
I also encounter the same question which the ratio is in terms of a:b , where a is larger than b ,Let's say a is 5, b is 1 , does it also mean Lp/Lm is 5???? Since you said that the model must be smaller than prototype?
0
2 years ago
#9
(Original post by wilson dang)
I also encounter the same question which the ratio is in terms of a:b , where a is larger than b ,
Let's say a is 5, b is 1 , does it also mean Lp/Lm is 5???? Since you said that the model must be smaller than prototype?

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Can you think of a sensible reason for building a model bigger than the prototype?
0
#10
(Original post by natninja)
Can you think of a sensible reason for building a model bigger than the prototype?
No, but, I saw the question like this, I doubt that is that similar to the previous case, which the model is smaller??

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0
#11
(Original post by natninja)
Can you think of a sensible reason for building a model bigger than the prototype?
when the scale ration is 6: 1 , does it mean the Lm / Lp = 6 , which model is 6 times larger than P , or Lp/ Lm = 6 , which means prototype is 6 times bigger than model ????
0
2 years ago
#12
(Original post by wilson dang)
when the scale ration is 6: 1 , does it mean the Lm / Lp = 6 , which model is 6 times larger than P , or Lp/ Lm = 6 , which means prototype is 6 times bigger than model ????
It requires you to apply a small amount of common sense. I don't see any reasonable reasons to make a model bigger than the thing so the model is clearly the smaller of the two.
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