A picture would certainly help.
It is in the form of a delta wing with 12 inches span and 17 inches long?
However even as a delta at 150 g it is pretty heavy already so would need significant power to fly which of course would make it heavier still so needing still more power.
In general a small plane has to be light, very light.
For example the
Night Vapour has a conventional plane layout with a wing and tail. It has a span of 14.8 inches yet with motor, battery and RC gear it weighs just 16.4 g!