If/when you need a test pilot for your low F and D (I know, you haven’t even mentioned making those keys yet, but if you do…), I’d be happy to accomodate you. 
Why did I buy my carbon bow for my fiddle at first… :roll:
But good to hear that Gary has not made his Low D yet. 
Have you made any wide bore D’s yet?
I need to decide about this.
Can anyone advise?
The differences between wide bore and narrow bore whistles of the same key are usually fairly subtle, because the difference in tube diameter is usually not very great.
With any key, there is an acceptable range of variation in the length to bore ratio.
If the bore is too narrow, the whistle will be very touchy and difficult to play… the lowest notes will be especially weak, and will want to jump into the 2nd octave too easily.
If the bore is too wide, the whistle will require excessive breath pressure to get the upper notes to sound… the excessive breath pressure will also increase the volume, and produce a more robust tone.
The window of a wide bore whistle will usually be a bit larger as well, since most makers use a formula based on bore diameter to determine the window size… this factor also contributes to higher breath requirement, higher volume, and more robust tonal characteristics.
Many whistle makers only offer one bore size per key, and select for it what they consider to be the optimal length to bore ratio.
I don’t know of any maker who offers both wide and narrow bore versions of every available key though… it’s just better suited to some keys, though it would work for all keys if someone really wanted to go overboard with bore size options! 
When wide and narrow bore variations are made available, both are kept within the acceptable range of variation in the length to bore ratio… wide bores are closer to the upper limits, and narrow bores are closer to the lower limits.
It’s mostly just a matter of personal preference… if you like a sweeter sounding and easier playing whistle, narrow bores are the way to go.
If you like a more robust sounding whistle that requires a slightly more aggressive playing technique, wide bores are the way to go.
Some people also just prefer the feel of a wide bore over that of a narrow bore… mostly in regards to soprano whistles, since people with large hands can have difficulty with narrow bore soprano whistles.
That’s my 2¢ worth on the matter, but maybe someone else will chime in with some points I might have failed to mention.
Thanks Raindog for your thorough explanation.
I am still negotiating with my wife about my birthday present.
So you have narrow bore A for $95
and slightly wider for $115, right?
Not quite… and I’m working on a chart to more clearly categorize whistles and prices.
You’re not the only one to be a bit confused by my current pricing information!
There will be a wide bore A that will have the same diameter tube as the low G, but they’re not available yet.
The bit about extra tubes was intended to mean that two or three different tubes fit the same size mouthpiece, and that additional tubes of different keys could be purchased either separately or as a set… but I didn’t word it quite right, and I’ll have it corrected shortly. 
In effect you must have 3 beak sizes and 3 respective tube diameters for sale:
1/2" beak = $70
1/2" tube = $15 each (E, Eb, narrow bore D)
9/16" beak = $72.50
9/16" tube = $17.50 each (wide bore D, C#, C)
5/8" beak = $75
5/8" tube = $20 each (B, Bb, narrow bore A)
Howzat? 
Now you’ve got it… and hopefully now I’ve also got it clarified it on my website! 
Would you consider custom made finger hole placements for 5/8" A tubes?
eg A Bb C# D Eb F G#
with a RH low G# pinkey at 2 o’clock
(ie for a Raag Multaan scale from a 3 finger D tonic)
What premium over and above the $20 per tube would this be?
You have the right to remain silent.
Exercise of this right will not be construed
as rudeness or incapacity or disinterest (I hope)
File this one under ‘incapacity’! 
I base the bore size to finger hole size ratios of all my tubes on Feadog D tubes.
This formula always produces nice intonation and a comfortable finger spread… but it’s based on a simple diatonic major scale, and I’d have no such example to emulate when making a tube like the one you described.
I suppose Flutomat or TWCalc could come up with a working hole pattern, but I’d bet on it taking repeated attempts to ever really get it right.
I also drill my finger holes with 2-flute end mills, which are so costly that I don’t keep a full set of 1/64" increments on hand… I only have the sizes that I use frequently, so I probably don’t even have the necessary sizes to drill a tube like you descriced.
Daniel Bingamon or Ronaldo Reyburn could probably make such a beast with no problems, but I’m afraid it’s way over my head! 
Thank you for your frankness, Raindog.
Just one thing, you quoted a previous version of my post.
But I don’t think that will change your response.
I need to decide between narrow and wide bore A.
I trust the info. elicited in my exchange with you
will be useful to others also.
When you do get to make the next size in tubes
for the G and the wide bore A
will it be for F also?
No, the wide bore A and low G will have 3/4" O.D. - 11/16" I.D. tubes.
The low F will have a 13/16" O.D. - 3/4" I.D. tube, which I only plan to use for low F and F#… though I doubt that anyone will ever want a low F# whistle.
I’m basing my choice for the bore diameter of my low F on the bore diameter of the Overton low F, which is one of my favorite whistles.
Not that something a bit smaller in diameter wouldn’t probably work, but I’m hoping to achieve a similar resonance and character in the tone of my low F… how’s that for ambition?
I know I’m a nobody
but do have to rub it in?
:roll:
BTW Thanks for all the info.
I need to decide between narrow bore A
or waiting for a wide bore A.
Bye for now.
I’ll bump this thread to say that after being in transit for twenty days a Humphrey narrow bore d in just intonation just landed here.
My first impression is that it’s a fine clean sounding whistle, obviously modelled on the Sindt design but with a different character to it. it’s a slightly more fragile blower than the Sindt, very light and easy to play but may thake soome adjsuting to if you’re a heavy blower. it actually suits me down to the ground.
It’s definitely a rich man’s generation type, without the glitches but with a pricetag,certainly if customs get hold of it and add 20 percent to the price as they did in my case.
I’ll post some further impressions later and will stick a few clips on the snips page. If i survive the WIllie Clancy week. :roll:
I, too, just received my Humphrey whistles (narrow bore d and A) and am very pleased. I am going to write something, too…sometime between feedings and diapers.
~J