Without phase current limitation you need to fine tune the pitch and diameter and voltage to not overload the windings of such motor. It is more critical compared to the direct cooling method i use with outrunner.
Anyhow, without phase current limitation you will always loose some possible power in some situations.
E.g. after fine tuning your system not to produce too much phase current you loose weight, the power you can generate stays below what you could have with phase current limitation.
Without phase current limitation you always have the risc of burning the windings. I would use a temperature sensor inside the windings to limit the power, using a kind of VESC or other advanced ESC.
I use 136mm prop diameter with different pitch and Kv inside 140mm inner diameter duct. I cut down commercial 7.25 or 7.5" props. I measured around 30kg static bollard thrust with 8" pitch.
If you say 100mm 0.8 pitch ratio, thats just 80mm pitch, at 4500RPM you get a theoretical speed of 21km/h without any losses. Thats way too low pitch.