possible diastatic problem with stout?

[Northern Brewer]

I brewed an extra stout yesterday that I have brewed before, the only major change to the recipe was a reduction in pale malt from 14kg to 11.5kg. As I'm a bit remote my visitors tend to drive and hesitate to sample high ABV beer so I thought I would keep it down to a reasonable level.

Looking at diastatic power the average works out to 70 lintner per kg of grain so I would have thought that I would get around 1056 OG but I ended up with 1046.

I'm not too worried about the OG, more the effect of any unconverted starch. Its in the FV and fermenting now, I haven't tested it with iodine, its as black as sump oil so not sure if I will see the colour change :grin:

Anybody guess what it will turn out like?
Cheers
Andy


Recipe: New Year Extra Stout 7th Dec 2013
Style: Foreign Extra Stout
TYPE: All Grain


Recipe Specifications
--------------------------

Batch Size (fermenter): 76.00 l
Estimated OG: 1.056 SG
Estimated Color: 147.4 EBC
Estimated IBU: 59.1 IBUs
Boil Time: 60 Minutes

Ingredients:
------------
11.50 kg Pale Malt, Maris Otter (5.9 EBC)
2.00 kg Barley, Flaked (Thomas Fawcett)
2.00 kg Crystal, Extra Dark (Simpsons)
2.00 kg Roasted Barley (Thomas Fawcett)
1.00 kg Black Malt (Simpsons) (1200.0 EBC)
1.00 kg Chocolate Malt (Thomas Fawcett)
80.00 g Northern Brewer [11.20 %] - Boil 60.0 min 25.6 IBUs
56.00 g Bobek (Styrian Golding B) [5.34 %] - Boil 60 mins 8.6 IBUs
50.00 g Fuggles [5.00 %] - Boil 60.0 mins 7.2 IBUs
32.00 g East Kent Goldings (EKG) [6.92 %] - Boil 60 mins 6.3 IBUs
78.00 g East Kent Goldings (EKG) [6.92 %] - Boil Hop 10 min 5.6 IBUs
50.00 g Fuggles [5.00 %] - Steep 1.3 IBUs
44.00 g Bobek (Styrian Golding B) [5.34 %] Steep 3.4 IBUs
20.00 g Northern Brewer [11.20 %] -Steep 1.2 IBUs
WYeast 1084 Irish Ale

 

[Aleman]

The general rule of thumb is that pale malt will convert itself and it's own weight of non diastatic adjuncts, so you should be fine. Although with that much crystal and roast malts you may well find it finishes higher than expected.

 

[Northern Brewer]

Many thanks for that I've thrown a few away recently due to mistakes so I'm down to my last cornie of decent ale. I was thinking it may finish 1012 or even 1014.

Cheers
Andy