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Bell (sweet sheep's nose) 1.059
Merton joy 1.061
Corse hill 1.055
Halstow natural 1.054
Bountiful 1.062
Bickington grey 1.070
Ribston pippin 1.057
Tremletts bitter 1.054
Assumed my cheap refractometer was reading wrong, but double checked with hydrometer and figures are correct. Overall 6 gallon batch around 1.058, individual figures obtained by putting single apples through a domestic juicer. Delighted, 7% cider here I come!
I've possibly just learned an important lesson about putting apples in cardboard boxes and forgetting about them for a while...
| Milling date | Variety | SG |
| 19/09/19 | Fair Maid of Devon | 1.052 |
| 19/09/19 | Tom Put | 1.05 |
| 13/11/19 | Yarlington Mill | 1.06 |
| 14/11/19 | Kingston Black | 1.07 |
| 14/11/19 | Black Dabinett | 1.06 |
| 14/11/19 | Ashmead's Kernel | 1.07 |
| 17/11/19 | Blenheim Orange | 1.052 |
| 17/11/19 | Kidd's Orange Red | 1.055 |
| 17/11/19 | Winston | 1.06 |
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On 21 Nov 2019, at 08:55, Ian Shields <iancs...@gmail.com> wrote:
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On 21 Nov 2019, at 10:09, 'dave pert' via Cider Workshop <cider-w...@googlegroups.com> wrote:
ok, so even if the initial sg is an approximation of sugar content am I right in assuming that the sg drop over the course of a fermentation is a fairly accurate basis for alcohol calculation - or is there anything else going on apart from the formation of alcohol from sugars that could throw the calculation significantly?thanks,Dave
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On 21 Nov 2019, at 11:21, 'dave pert' via Cider Workshop <cider-w...@googlegroups.com> wrote:
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But even with 0.5% margin - isn't it risky to state ABV based on hydrometer reading?
There are some very rough approximations involved.
1. we do not know how much fermentable sugars there are in the juice to start with,
we can only translate SG to sugars based on averaged data from scientific measurements, or make an educated guess based on the following this thinking:
- translate SG/Brix (OG) reading to "amount of dissolved total solids", making an assumption that the TS have same properties as sucrose
- assume fermentable sugars are approximately 80% of these TS
2. we do not know how mauch sugars were fermented
- we estimate it from the OG-FG delta, disregarding it could have been affected but changes in other juice compoments, not only sugars
3. and on top of this we assume certain efficiency of yeast in converting the cugars into alcohol
I never checked with ebulliometer, but I wonder how much off are these SG-based ABV estimations comparing to reality.
//Bartek
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JD, here in South Somerset, UK, our mix of cider apples and Bramley from old orchards has consistently come in at an SG of 1050/1 across 6 separate pressings. It is quite uncanny in its consistency!
John
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As i also started growing some English cider varieties (Cropping only Dabinett at the moment), thought i might add my experiences.
2017 was very cold and rainy with very low sugars.
The season 2018 was hot and dry and i saw the best apples in my 10 year experience.
The season 2019 was kind of pretty average weather. Lost much due to frosts at bloom time and the rotting was heavy this year. Some varieties didnt crop well.
Mostly meassure in brix, but i guess sg is just by multiplying with 4, right?
Dabinett 2018 - brix 15,2
Dabinett 2019 - brix 14.9
Eating varieties 2018 - Brix 10,8-14
Eating varieties 2019 - Brix 11-16
What surprises me is that our sugar levels here in North seem to be pretty ok compared to what i hear from British collegues. Any scientific explanation for that?
Crab apples both years 12-19
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