Question: dimensionless numbers/ algsubs..eliminate?

I have tried:

algsubs(Uo/sqrt(GoHo)=Fr, Go Ho/ Uo^2)

(where I want it to yield the answer `1/Fr^2`)

but it just returns:

Go Ho/ Uo^2

I have only just starting using maple , but as far as I can see other possible functions may be solve or eliminate but I believe they aren't relevant here..?

Many thanks for your help !

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