geometric similarity

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

can you explain why are you so sure that Lm/Lp = 1/6 ????

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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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.

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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Can you think of a sensible reason for building a model bigger than the prototype?

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 ????