11x23=253 Watts as compared to 155 Watts estimated by the calculator. Trust efficiency went down the drain fast, probably due to the high jetstream speed.
I may have some more thinking to do for such small high speed sizes. It would be nice if I could get it down to decent deviations like 5% off or so. Hopefully not too many variables like tailpipe diameter reduction etc. which reduce thrust, but increase speed and power drain. From the pictures, I guess your plane had about 60% tailpipe outlet area as compared to the prop disk section, in which case it may be as simple as 100/60*155=258Watts. Close enough for all purposes.

Edit:
OTOH, reducing airflow through a fan by adding restrictions, makes the rev's go up and reduces motor load, so above reasoning cannot be used.
end edit

Anyway, thanks very much for the data.