O.G Queary

[modo]

I did an Oktoberfest yesterday AG. On my pre boil of both runnings combined I got 1.039 and post boil in the fermenter minus the yeast I got 1.051 both were calculated at 20c. Does this sound right.

[warra48]

Could well be right, although it does seem at the high end of the scale, but it depends on the degree of boil off you achieved.

Looking through my BeerSmith recipes, the difference between SG preboil post sparge and the SG into the fermenter has been up to 25%, depending on the vigour of the boil. Lately I get less than that as I don't boil with much vigour anymore. The largest movement I had was from 1.048 to 1.060.

Although you say you measured both at 20ºC, the wort into the kettle preboil is no doubt more in the range of 50 to 60ºC, and the volume is therefore expanded from what it would be at 20ºC.

I notice my volume in the kettle reduces by about 1 litre after chilling down to the range of 20 to 25ºC, by as much as 1 litre in 25.

[drsmurto]

I did an Oktoberfest yesterday as well, pre boil was 1.036, post boil 1.048 (aiming for 1.051 but e4nded up with 21.5L instead of 20L).

I boil for 90 mins and set my evap rate to 15%/hour

[modo]

Thank's boys.