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Old 09-23-2013, 07:29 PM   #1
Still_dreamin
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Default Old Rasputin vs. the XV... a question of IBUs

So i had my first Old Rasputin Anniversary XV this past weekend and loved it. I'm thinking about replicating it at home and have seen several Old Rasputin clones, but none specifically mimicking the Old Rasputin XV Anniversary.

The easiest solution would seem to be to brew up an OR clone, and add bourbon-soaked oak chips to achieve the OR XV flavour profile BUT i have noticed one glaring difference between the two: the Classic, regular Old Rasputin has an IBU of 75... whereas the Old Rasputin XV Anniversary brew (the one i'm interesting in duplicating) has an IBU of 38. The XV is also at 11.9% while the classic is at 9%... but that could be addressed through the addition of bourbony-oak.

http://www.northcoastbrewing.com/beer-rasputin.htm
http://www.northcoastbrewing.com/beer-rasputin-barrel-aged.htm

This makes me think there'd be more to duplicating the XV brew then just adding bourboned oak to a classic OR clone...

As i understand it, IBUs are based on perceived bitterness. The bourbon & oak *could* be reducing the perceived hop character resulting in a lower IBU, while the actual recipe of the beer (and more notably, the hop schedule) is identical??? Or it could be a case of less hops added to the XV.

Anybody have any thoughts on this? Thanks!

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Old 09-23-2013, 07:40 PM   #2
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I've never heard that IBUs are perceived bitterness.
In fact, there are labs that test IBU levels.

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Old 09-23-2013, 07:43 PM   #3
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Ya i'm a bit foggy on that myself. I've also read about the mechanized, standardized testing but then have also come across this little nugget on the wikipedia page for beer measurement under the bitterness section...

"The bittering effect is less noticeable in beers with a high quantity of malt, so a higher IBU is needed in heavier beers to balance the flavor. For example, an Imperial Stout may have an IBU of 50, but will taste less bitter than an English Bitter with an IBU of 30, because the latter beer uses much less malt than the former."

Then again, that's just wikipedia, so who knows?
http://en.wikipedia.org/wiki/Beer_measurement

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Old 09-23-2013, 09:35 PM   #4
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They're different beers. From the North Coast website on anniversary version: "[blah blah lots of great stuff] make it a worthy tribute to Old Rasputin."

And, they must be using some kind of chemical test, or at least a calculation based on the AA% of their hops, to come to 79 IBU's on the original. 79 is a hoppy pale, or a sessionable IPA, which are way more subjectively bitter-tasting than the smooth roasty goodness that is Old Rasputin.

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Old 09-23-2013, 10:06 PM   #5
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Hmmm. Ya. Thanks for your thoughts. I suppose the best way forward is to brew an OR clone, add bourbon soaked oak to the secondary, hope for the best and tweak it from there...??

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Old 09-24-2013, 01:26 AM   #6
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IBU's are based on mg of alpha acid per liter of liquid (beer). It has nothing to do with how the bitterness is perceived. They probably add less bittering in order to accentuate the oak character of the beer. I'd say just reduce the bittering hops in the clone recipes to get the proper IBU's and oak age from there.

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Old 09-25-2013, 05:51 AM   #7
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humm, having brewed a great clone of "old rasputin" this sounds like one I should look into...

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Old 09-26-2013, 03:58 PM   #8
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If the anniversary is higher in alcohol and lower in IBU's then that makes sense as mentioned, in higher gravity beers the hops are not as efficient in the boil. Here is where math comes in handy but with brewing software out there you can simply plug in the clone recipe then look at the malt percentages and start ramping them up until you get the gravity you need for 11.9 percent alcohol. Keep an eye on the IBU's because they will start decreasing as the malt bill gets higher. Once you have achieved the proper OG then raise or lower the hop bill to get their advertised IBU level. This should get you pretty close.

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Old 09-27-2013, 03:34 AM   #9
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Thanks for the great advice everyone!

Tootal - that definitely sounds like a good way to go.

Dracus - any chance you'd post this great recipe of yours??

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Old 09-27-2013, 05:24 AM   #10
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Quote:
Originally Posted by Still_dreamin View Post
.. Dracus - any chance you'd post this great recipe of yours??
Seconded
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