#### symphony1975

##### Well-Known Member

- Joined
- 21/9/09

- Messages
- 147

- Reaction score
- 21

i have done 4 batches of all grain brewing now (urn for HLT, esky mashtun and kettle) and am trying to iron out a few numbers in beersmith. i have been hitting my volumes:

32L pre boil

4.5L boil-off (14% per hr)

1.0L cooling loss

5.5L trub loss

21L into fermenter

i am also hitting my strike water temp, mash temp, P/H (batch sparge, 1 sparge)

currently 66% efficiency.

for the last 2 batches i have been 7 points under target pre boil gravity and 11 points under target OG.

i was expecting that if you have your volumes correct for the boil process that your gravity would be out by the same amount for pre boil and OG. i.e if preboil is 7 points under, OG will also be 7 points under. Therefore the above gravity readings would indicate not enough boiling of the wort.

am i way off the mark?

how would you interpret these numbers?

thanks for your help....