I remember seeing a double whistle for sale somewhere which plays a continuos D while you play. Can someone please let me know who the maker of this is or if there are more than one then which you feel is best. I have actually taped the holes on one of my cheaper whistles and attached it to another trying to get this effect but it takes a little more wind than I can muster some times and the tonal quality is what you might expect… Any help would be greatly appreciated.
There’s got to be a lot of these “droned” whistles. Tully makes one:
http://www.tullberg.com/tully/whistles.html
daniel bingamon makes them http://jubileeinstruments.messianic-webhosting.com/jubilee.htm but i wouldn’t know how they sound like
Tully is the one i remember seeing but I would liekt ot find one a little less expensive…
Make one yourself by taping two D whistles together, and taping the holes of one shut with tape. Note though, that if you are going to play against a drone seriously, you really will want just intonation, meaning that you might want to tune some notes a little bit with tape so that every note sounds good against the drone (and not against your chromatic tuner on equal temprament).
I’ve been meanting to try this for a while, and would be interested to hear how the drone whistle would behave when you take the melody whistle to the second octave (will it also flip up an octave?).
Like I say, I have taped two whistles together, the trouble is that the spacing between the fipples is too great and you loose a lot of breath and a lot of quality. To answer your question, the actave does jump on the second whistle. The tone just becomes too much to control since you must pump in all the wind you can muster just to get both to sound considering the loss you get from not being able to seal your mouth around the fipple. The solution is a device that would attach to the fipple of both with a single mouthpiece. both in a manner much like the jubilee whistle above. I may get to work on that. Just for the record the patent will belong to me ha ha
I thought I had read your post… 
With “just intonation” for a D whistle, it would work well in that key, but perhaps not so well in several other keys, although I still doubt if anyone could tell much difference…whistle intonation changes more with pressure than the difference between just and equal.
Playing through two whistles, for a drone, you’d get the upper octave on both when you change pressure.
I use to use a harmonica type reed, from the “pitch pipes” made for violin players. These come in groups of four, but each can be seperately removed and can be placed in the mouth with the whistle, and won’t jump octave on you. Get two, or three, an octave apart, for the real uilleann pipe type experience! 
Oh…and don’t forget to “breeeeeeath!” 
(you may pass out from hyperventilation-gasp!)
IMHO the problem with a droned whistle is that, unless you’re very good with circular breathing 
the drone is not going to be constant.
There are a couple of “bagwhistles” around, for example:
http://jubileeinstruments.messianic-webhosting.com/bwhistoffer.htm
but the problem is that the whistle will consume the air a lot faster than a reeded instrument (e.g. bagpipe chanter) would.
Yes, Bloo, my ceramic double whistle jumps octaves when I go high.
Not if you can chew gum and suck eggs at the same time.