I don't own anything that I would consider a wet noodle, but I do own a couple that I would consider to have way more 'ease of flex' than anything modern I own. The Doric with the 14K #3 Adjustable nib being the easiest (I don't rank them by how much flex they give but how easily they give it, such as if I can do it with just light scribble to the point that I need to use a light hand to avoid it).
I don't have my Eversharp Skyline in Silver Moire with the flex~semi-flex nib, nor the black standard skyline with the semi-flex EF inked, but I do have the Doric, a Pilot Metal Falcon with an Soft EF, and a 1956 Pelikan 400NN with a 14K semi-flex-ish EF inked currently, as well as a Zebra-G dip nib handy (which while it can provide greater line variation than my doric without scaring the (bleep) out of me, requires more pressure to do so, but less pressure than the Falcon or 400NN.)
Quick write sample on some Environotes Sugarcane paper (feels more absorbent like that of regular notebook paper, but doesn't bleed/feather, putting it closer to Rhodia quality in terms of wet inks and strokes). I swear the broadest strokes with the Zebra-G and older Lamy Blue-Black formulation takes close to 10 minutes to dry without blotting.
Top to bottom:
Wahl-Eversharp Skyline Doric, Kashmir (1931-1935), 14K #3 Adjustable nib, Edelstein Jade
Pilot Metal Falcon (Brown), 14K Soft Extra-Fine, Iroshizuku Tsuki-yo
Pelikan 400NN (1956), Green Stripe, 14K Semi-Flex-ish Extra-Fine, R&K Salix (weaker Iron Gall)
Zebra-G Dip nib in a Tachikawa Model-40, Lamy Blue-Black (older Iron Gall Formula)
and the little note in red is Pelikan 140 (50s), black with green ink window, 14K Broad cursive italic (with some spring), Diamine Oxblood.
The point is to illustrate just effortless pressure of each, essentially not going beyond what I feel is 'normal' writing pressure for nibs in general, except in the cross-stroke where I mark where I begin to go beyond (ie: the beyond mark is when I use more press than I did for the doric at top).
PS: none of the lines bled thru to the other side. The Lamy Blue-Black bolder lines had a more distinctive shadow on the other side, but not bled thru.
Pardon the chicken-scratch, I got a long way to go.
Click for the full 300 DPI scan.
Edit, if you don't know what I mean by adjustable:
Edited by KBeezie, 24 May 2015 - 22:51.