Noodler's Ahab Flex Fountain Pen - Hudson Bay Fathom's Blue

Product Code N15042
In Stock, Usually Ships in 1 to 2 Business Days
The Ahab flex pen was introduced in late 2011 and is currently Noodler's most popular fountain pen. It features a steel flexible #6 nib and a slide piston mechanism.
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Noodler's Ahab Flex Fountain Pen - Hudson Bay Fathom's Blue

The Ahab flex pen was introduced in late 2011 and is currently Noodler's most popular fountain pen. It features a steel flexible #6 nib and a slide piston mechanism. If you'd like, you can even remove the piston mechanism and use the pen as an eyedropper for a massive 6ml ink capacity. The Ahab is made of a celluloid derivative and is technically biodegradable and formed from a "renewable resource". The vegetal resin body of this pen may show particles or striations within the material. This is most noticeable in demonstrators and bright colors.

The Noodler's flex pens were designed for the hands-on tinkerer - they are made to be taken apart and adjusted. The nib and feed pull right out and can be adjusted and heat set for optimal performance. Don't be afraid to get a little ink on your fingers while you learn how to use this pen.

As a simple rule of thumb for writing with a flex pen, just apply slight pressure on your downstrokes, which will spread the tines and increase the line width, achieving that optimal line variation. Make sure to go slowly so that the ink can keep up with your writing. As with any flex pen, it just takes practice!

Due to the residual machining oils used when cutting the feeds for these pens, we highly encourage you to give the pen a good flush before use. We recommend any of the following options: distilled water, water with a touch of dish soap, a pre-packaged pen flush, or a solution of 10% clear ammonia to water. This should resolve most ink flow issues!

Usually Ships in 1 to 2 Business Days
Fountain Pens
Pen Model
Noodler's Ahab
Body Color
Body Material
Cap Type
Compatible inks & refills
Bottled inks
Filling Mechanism
Eyedropper, Piston
Grip Material
Nib Color
Nib Material
Nib Size
Diameter - Body
14mm (0.6in)
Diameter - Cap (without clip)
15mm (0.6in)
Diameter - Cap (with clip)
20mm (0.8in)
Diameter - Grip
9.9mm (0.4in)
Length - Body
128mm (5in)
Length - Cap
60mm (2.4in)
Length - Nib
20mm (0.8in)
Length - Overall (Closed)
139mm (5.5in)
Length - Overall (Posted)
170mm (6.7in)
Weight - Body
12g (0.4oz)
Weight - Cap
6g (0.2oz)
Weight - Overall
18g (0.6oz)
Max Ink Capacity - Eyedropper
Max Ink Capacity - Piston/Vac
Noodler's Ahab Flex Fountain Pen - Hudson Bay Fathom's Blue Demonstrator is rated 4.5263 out of 5 by 38.
Rated 5 out of 5 by from Art: Wonderful Pen, but a Dip pen alternative? This is my first fountain pen, well if you ignore fountain brush pens. However I was looking for an affordable, flex fountain pen to use for art that wasn't going to cost me a great deal. This is excellent for the price. Simply put, I wanted something to replace my dip pen experience, but in a convenient fountain pen form. Well probably not going to happen without spending a lot on a gold nib pen or modifying this one. But for $23? This is great. I attached a photo of my experimenting for reference. Basically I was testing line variation with the nib that comes with the Ahab, the unzipped flex in the art set and my g-pen. Winner? G-pen. However don't count the Ahab out. While the variation isn't quite as awesome, it still has some and with the convenience of the ink in your pen. Take a look, a light touch created some really thin lines. Not fine lines like my g-pen but still enough to give life to your lines. Great for sketching or practicing inking techniques. I like the tipped nib better, since vertical lines with the untipped were broad because if how it's cut. I'm thinking an untipped version like my g-pen on the Ahab would be AMAZING.... But that's just a theory lol. Oh this was on Bristol paper. You should note what everyone else said. You'll get your hands dirty. But if you're doing any kind of art that isn't pure digital, you're used to it. Cleaning your tools, practicing with them, adjusting them and "breaking them in" are things you just expect. You have to mess with the pen, adjust it, test it and make a mess but I think that's its own fun too. I didn't need to heat set it but I watched the video if I felt I might need to eventually. It also has that smell... Meh it'll fade so I'm over it. Fast shipping and a friendly note on my shipping receipt! I have to say Goulet Pens is pretty awesome. And I didn't want to risk getting a knock off on I love amazon but some can vendors ruin certain products reputations if you get fakes and think it's legit. Oh and be careful I almost bent the little air straw part that on the inside of the piston part pushing it in with ink and I could not see if it lined up with the hole properly. I don't know the formal names but once you have it you'll see what the I mean.
Date published: 2015-08-11
Rated 5 out of 5 by from Holy Cow Ahab Man!! Ok, so this and the creeper were my first flex pens and I was scared because of all the feed issues and such that I've read about, but let me just say ... Freaking Awesome!!! Out the box, I followed the instructions in the video above and cleaned the feed and even the pen with Dawn Dish Soap; then dried, put it together, and inked it up with Noodlers Anti-Feather. Flawless!! Freaking Flawless!!! The nib and feed are per specs provided in the Noodlers video and the feed keeps up at full flex with Zero Issues!! I will buy MORE!! A LOT MORE!!! This pen is an awesome value!
Date published: 2014-10-20
Rated 5 out of 5 by from problem resolved! the first ahab sent to me had an ill-fitting converter that resulted in a desk top splattered with an entire fill of navajo turquoise! contacted goulet and a second one was shipped to me immediately... signature goulet service. they even told me to keep the first one which gave me the opportunity to experiment with my first eyedropper conversion. as with all ahabs, it took a bit of tinkering to get them to my liking. but once cleaned and nib/flow adjusted, i'm flex writing to my heart's content. the hudson bay fathom blue pen color is beautiful... i'm glad to have the two sit side by side in my collection.
Date published: 2014-10-20
Rated 4 out of 5 by from Harder to flex than the Nib Creeper flex... BUT I like the feel of this one in my hand a lot more. I like the larger pen size and large ink capacity. However, I do tend to grip this one so low it leaks on my fingers. I don't have that issue with the nib creeper flex. I like the color. Light enough to see the ink capacity up close and when I am writing, but not so dark that you would mistake it for a non-demonstrator when filled with ink. It is a very cheerful color, and I like the choice of having something other than clear demonstrators to choose from. This is a nice pen, but I have to press harder than I'd like to get flex. I'd call this one more springy than flexy.
Date published: 2014-10-20
Rated 5 out of 5 by from Huge Ink Capacity I did the ink dropper conversion using Brian's ink syringe and silicone grease. I misplace my pack of O-Rings but the silicone grease alone seems to work just fine. I also replaced the flex nib with the 1.5 mm Goulet Nib. It is very smooth with none of the hassle of flex writing. BEFORE USE OF THIS PEN WASH/SCRUB THE FEED WITH A SOLUTION OF WATER, DAWN AND 10% AMONIA!!! Not doing so allows the the oil in the feed manufacturing process to drastically limit ink flow to the point a 1.5 mm nib writes like a Fine to Medium nib with ink only coming from the groove between the tines and not spreading out across the nib.
Date published: 2014-10-20
Rated 4 out of 5 by from Tinkerer's Dream The Ahab Hudson Bay Demonstrator is my third Noodler's pen I've purchased from Goulet, and it is by far the best behaved. I also have a Creaper Flex and a Konrad. The Noodler's Flex pens are notorious for their frustrating need for a lot of user adjustment before they write perfectly, and to this day my Creaper is a rail-roading nightmare, and the Konrad took a LOT of adjustment on my part before I was happy with it, but the Ahab was almost perfect right out of the box. The best tip I can give is that the pen needs to be THOROUGHLY cleaned before inking. I first washed the pen with warm water (completely disassembled is crucial), followed by a thorough cleaning with a mix of ammonia and dish soap (very little) in warm water, followed by a final cleaning with plain warm water. After reassembling the cleaned pen and adjusting the way the nib and feed meet, it is an absolute flex MACHINE! Requires more pressure to flex than a vintage gold flex nib, but for $20 you cant lose, can you?
Date published: 2014-10-20
Rated 2 out of 5 by from Disappointing, but fortunately it was inexpensive. I own several really nice pens that live on my desk. I am always looking for something inexpensive that will write well and look reasonably good but will not fear losing or damaging. I guess I am used to nicer stuff. This pen writes well if you don't flex it (fine line) but it takes a lot of pressure to flex. And when it flexes there is either a lot of railroading or way too much ink that takes forever to dry. The finish on this pen is OK considering it was $20. It is a demonstrator (Fathom's Blue), but much cloudier than I expected (I thought it would be clear) and there are multiple flaws (several little bubbles) in the material. I'm keeping it because cheap pens have a purpose, but you can't compare it to nicer pens. They did something really well though--the converter is easy to use and holds a lot if ink--I wish other brands would adopt something similar.
Date published: 2014-10-20
Rated 5 out of 5 by from Ahab Flex Pen--great entry into flex I read so many mixed reviews on this pen. The biggest gripe seems to be the smell of the vegetal resin body. It's tolerable IMO, so that wasn't a major concern with me. The flex is decent, although you do need to bear down to achieve it. For straight writing it's pretty smooth, and writes for me with only light pressure, which I like. Pretty good quality, and for its price, an excellent deal.
Date published: 2014-10-20
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