The compound nucleus ²³⁹Pu* has been formed by bombardment of ²³⁵U and ²³⁶U by ⁴He and ³He projectiles respectively. Bombarding energies were adjusted so that the effects of both excitation and angular momentum of the compound nucleus on scission point parameters could be observed. An unexpectedly strong effect, seemingly too large to be due to angular momentum, is apparently caused by some unidentified difference between reactions in which ³He and ⁴He are the projectiles. A correlation between mean total kinetic energy of the fission fragments and the fissility parameter and excitation energy of the compound nucleus is given which allows the estimation of (TKE) to +or-2 MeV for any system fissioned by charged particles.