Having played a lovely Asarkar low D whistle for a little over a year now, I feel that it’s time to add a new one to my collection. As for now, it’s low Bb vs. low C (with a strong leaning towards Bb). I’d really love to have one in low Bb, but since my hands a rather… tiny compared to other males’ (I can almost fit half of my index finger into my Generation Bb whistle 
) I imagine that I’d have a hard time covering the holes properly. That’s were low C comes in. It’s deeper than a D, but not as big as a Bb, so it’s a quite good comprimize (I hope). By the way, do all low Bb whistles have about the same measurments, or does that differ from manufacturer to manufacturer? Could there be “small” low Bb whistles (relatively speaking)?
I have an Overton bass Bb whistle with an inside diameter of 28mm. My chieftain low C with fit inside with room to spare. The largest tone hole is the second fro the bottom, and measures at a bit more than 12mm. The inside diameter of a Gen Bb is a bit more than 14mm. The other tone hole sizes on my Bass Bb are 8mm, and 11mm.
The hole spacing on the bass Bb are closer than on a Howard low C. I hope this gives you some insight. You can find more information by contacting Overton, and Alba also makes bass whistles.
Thanks for your reply! However, the brands you just mentioned are out of my economical reach (whistles for more than 1000 Swedish kronor [about US$138] are for millionaries 
) I probably should’ve mentioned that in my original post. Are you (or anyone else reading this) perhaps familiar with the measurments of Metcalf’s low C and Bb whistles (those of his Copper Whistle series in particular)? I’ll send him a mail and see what he says, just in case no one here knows
Do you really mean low C? That’s a huge whistle!
If you’re struggling to reach the holes on a Gen Bb, then try using your fourth finger on the bottom hole rather than using your third finger.
Guido makes some nice cheap European whistles…
Where in my post did I mention that? I said I could fit about half of my index finger into a Generation Bb (by that I meant the bottom opening of it)! If I were struggling to reach the holes of a Generation Bb, my fingers would have to be about 2cm in length (and thankfully that’s not the case ).
“Reach” refers to the spread of your hand, not the width or length of your fingers, so if you have small hands, then you’ll struggle with a low C whistle, but I don’t think you really mean a low C whistle. Take a look online and point me to a “low C whistle”.
Here is another maker of low & bass whistles.
If money is a real issue, try making your own using Guido’s instructions. You could have a low D,C and Bb for a couple of dollar’s worth of PVC pipe and have fun doing it.
The issue with low-C or -Bflat whistles isn’t the stretch of the hands as the suppleness of your arms/wrists. There’s just no way to make a bass whistle that doesn’t put your hands very far from your mouth. Even in a “small hands” whistle, like the Jubilees that Tommy linked, to put your hands, especially the lower hand, really far from your mouth, meaning that your wrists need to bend at an angle that’s uncomfortable for many people. Me, at least.
The bottom hole on my Overton Bass Bb is only 23’’ from the top. If you hold the whistle to high or straight out like a small whistle the right hand wrist needs to bend. Lower the big whistle down some and the wrist will come straight. It is not a trumpet. loll
Johan, I sent you an email with a short video of the tone hole spacing on an Overton bass Bb. Click on the photo for the video.
After watching your video I get the impression that a low Bb whistle really isn’t that big.