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Ref is usually in the 140s. If Ref is over 150 KIAS with 30 flaps you're overweight.

If you put a gun to my head and said “name the average Vref of the 737 or I’ll kill you” I’d probably die. We have way too many different variants and loads. But 140’s sounds about right much of the time. Easily into the 160’s with gusty winds and the appropriate additive though. I did learn a neat thing in recurrent this year. Your V2 speed is pretty close to your TO GW, if you move the decimal place 3 left. Not an exact science, or even something that could qualify as a rule-of-thumb, but more of an observation that one can use to sanity check the V speeds
 
If you put a gun to my head and said “name the average Vref of the 737 or I’ll kill you” I’d probably die. We have way too many different variants and loads. But 140’s sounds about right much of the time. Easily into the 160’s with gusty winds and the appropriate additive though. I did learn a neat thing in recurrent this year. Your V2 speed is pretty close to your TO GW, if you move the decimal place 3 left. Not an exact science, or even something that could qualify as a rule-of-thumb, but more of an observation that one can use to sanity check the V speeds

Empty and and light on fuel, about 115
 
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