sam132 said:
Thanks Andy,
Some great info there!
So looking at the spread-sheet if I wanted a strength of 4.8% I need to add 97 grams of sugar (per litre).
What's the S.G. Degrees all about?
S.G = specific gravity - a measure of the density of the liquid - the more sugars dissolved in the liquid, the denser, and the more food for the yeast, so a higher finished percentage alcohol by volume (abv).
the apple juice already has some sugars in it, so the starting SG should be around 1.040 - if you add more sugar it'll have a higher SG, and will ferment for longer, and be more alcoholic.
for PA - percentage alcohol (abv) of 4.8 you need to have 97g per litre - taking into account the sugar already in the apple juice. which is why you take a starting gravity reading with your hydrometer. If the SG is already 1.050 at the start, then you'll get an abv of 6.8% without adding any more sugar - the only way to get it to 4.8 would be to purposefuly stop the fermentation early, before all the sugar has been turned to alcohol (using Camden Tablets and Potasium Sorbate), which would leave you with a sweet cider, that won't become fizzy (see further down)
Would there be any issue with leaving the cider longer than the 5 weeks? If I bottled it would it keep for longer?
Also during the fermentation process do you keep it by a window ect? Or would it be fine stored outside in a shed ect?
Any tips on making it fizzy?
Thanks for all your help, really appreciated.
Sam
no issue in leaving it longer before bottling, or longer once bottled. it will improve with age either way, up to a certain point, the flavours will mellow out.
fermentation should take place at around 20 deg C - too warm (about 23), and you get bad alcohol, too cool (below 15) and you get a very slow fermentation, too cold (below about 10), and the fermentation may stop completely, and might stick once warmer, which can cause infection, and ruined cider. So, ok to store outside but beware it may not finish fermenting till late next spring when warmer again.
to make it fizzy, you have to bottle it, with some added sugar, not too much - about half teaspoon per litre, in bottles that can take the pressure (not wine bottles - but capped beer bottles, or plastic 'pop' bottles) - this will cause an anaerobic malolactic fermentation (without air) the carbon dioxide produced can not escape the bottle, and so gets 'stored' in the liquid - when the pressure is released on opening the bottle, the CO2 can escape, as bubbles (fizz) - too much sugar, and BANG. bottle bomb, or eruption.
If you have stabilised the juice, with camden tablets and potasium sorbate, there won't be any live yeast, and so you won't get a secondary fermentation in the bottle, no matter how much extra sugar you add, it'll just be sweeter.
Hope this all helps.