since I am still very new to flaps, most of my flights so far (maiden video included) were no flaps. So to answer the question, it is very easy to fly without flaps. If you're heading out to FF I'll print out a handful of the flap horn for anyone that wants them! You can cut them out and just take them off and add horns later. If you won't be making it to FF so me a pm with your address and I can throw a few in an envelope and mail them for you!
If you are like me and hand launching without flaps the first 5 seconds are a bit hair raising. Full throttle, a little right rudder, and strong nerves, 'cuz she drops to the left until you've got enough speed....
Now you got me thinking I need to upload the stl to Thingiverse along with the exhaust ...
I think the height was the same as the tall FT P47 aileron horns, I just tweaked them a bit too deal with not cutting a slot for clearance.