The biggest drawback was the need of a dowel through the middle. This limited the power and penetration.
So I looked around and found clay pigeon throwers do exactly what I wanted to do! They throw a heavy object (120 grams (1/2 lb) or so) and they give it a spin in orer to stabilize the flight.
I took the idea and made on of these. Of course I added a stock so the weapon is hand held, and I used a magnet to hold the saw blade in place. I found that I have to throw the blade at an angle, canted to the right, or elde the disk will flip to the left quickly. With the canting, it flies beautifully straight and quite far.
A strong 60 kg steel spring powers this thing. Quite a kick - and sideways! You have to get used to this, really.
I can hit a shoe box size target from 10 meters. Not great accuracy, but the best saw blade shooter I have ever fired, for sure!
This will need some enhancements, basically for looks.