Thanks Rusty, I'm not familiar with the Norvels. Thought I would try something different from the Cox's. Thanks, Ed.
Once you get that first aggravating crank out of the way, you'll fall in love with the Norvel. I love my Tee Dees, so I hate to say it, but you won't want to go back. I highly recommend a starter spring. And if you get a muffler, it really makes a sweet quiet scream. It has so much power once it's fully run in, that any power loss from the muffler can be easily overcome with a shorter prop. I use Master Airscrew GF 6x3s cut down to 5.75, 5.5 and 5.25". And if I want to cram it into a small circle on 35' lines, an APC 6x2 will let it rev up where it loves to be and still fly at a manageable speed. It only uses about half as much fuel as a Tee Dee too. Very efficient. I use Sig 25% with an extra 2% added drugstore castor. If you want to run it on a pressure bladder, I can show you how to make a great fine thread NV for it.
Rusty