Radiator Venting

Vermonter_3

With thanks to Steamhead I've got a Gorton 2 and a Hoffman 4A headed my way.

Now it's time to really fine tune the radiator venting.

Is there a rule of thumb for volume of air inside a radiator? Is it save to assume say 1 cubic foot per 5 ft. EDR? I'm sure there are a LOT of variables. The radiators in the house are all fairly similar and from 1926, not too frilly, and not the "thin" type.

Is the venting rate of the small 1/8" vents in the famous book too?

Thanks again.

Steamhead (in transit)

It's in Gerry Gill and Steve Pajek's famous e-book

but this time, you want to vent all the air in the rad and the runout in 7-10 minutes or so.

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Vermonter_3

What's the runout?

Or is that in the book too?