9900 on 15x4W produces more like 9~10 lb static thrust.

Also, YS 110 w/ 17x6 produces more like 15 lb static thrust.

I use Pro Zinger 15x4 on my Saito 82. It's on a 4.5 lb profile. It literally pulls out like a rocket, accelerating upwards faster that it free-falls. The spool up is instant too! This prop should be good for UCD 46.