You'll find them, Herman, easy starting (in either direction!), friendly engines.
FWIW, I'll repeat here that the .11s were designed by Bob Holland (of Hornet fame) and built by Hy Johnson's Dynamic Models for Gilbert, who later took over manufacture of both sizes (.07 built by Gilbert only). They were in production for only 3-4 years IIRC.
Though glow heads from the Fox Rocket .09, Fox .10 and Hustler .10 will fit the Gilbert .11, Fox had no significant involvement in the Gilberts, despite the external resemblance of his .09.