4.7L Pistons & Bearings. Crown Automotive offers the largest line of Engine replacement parts for Jeep®. Our applications include Cylinder Head, Engine Oiling, Pistons, Bearings, Camshaft, Crankshaft, Valves, Timing, Mounts and Gaskets for all Jeep® models. A larger bore helps ease the transition from trumpet to flugelhorn. News & Events.
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https://www.musik-produktiv.co.uk/bruno-tilz-210-s4-deutsch.html
The older rotary valves can be a little slow but the newer ones with the Minibal connections are quite good and fast. Some pro players have their irreplacable Heckels and other old gems rebuilt with that linkage. (on the photo: old left, new right).
https://www.facebook.com/MusikhausLanghammer/photos/a.413080632056453/1140028736028302/?type=3&theater
I don't think the rotary flügel is very suitable for jazz, the sound is somehow too massive, but who knows, in jazz everything is possible if you have the right idea. Anyway, the sound of the rotary flügel is quite different than that of the piston flügel so if you are looking for a common jazz flügel sound, buy a piston flügel.
But: there are all kind of rotary flügels, Thomas Gansch plays the Schagerl Killer Queen, a TARV flügel which sounds in his hands quite good. Maybe that is not a typical rotary flügelhorn.
BTW I remember that I read somewhere that Jimmy Owens played a 4-valve Alexander rotary flügel.