Sci-Fi Storm

OK, here is something new to try. Something reminded me of a movie from when I was a kid – it had to have been produced in the 70s, but precisely when I don’t know. I remember seeing it on TV a number of times, but I have no idea what the title was. I’d like to see if anyone can remember it from my description. Read More for the description, and then post your ideas.

The movie primarily takes place on a spaceship with a really fast drive system. There was a small group of people on the ship (I’m guessing around 6), including one “family” – I believe a husband, wife, and a son, approx. 12 years old, maybe older.

I know a fair portion of the movie deal with the fact that the ship would explode in a certain amount of time (I think there was a 60 minute clock running) if something wasn’t done – I think it may have been a bomb or sabotage of the engine or something.

Visually the most rememberable thing was when the ships drive was engaged, there would be a forward view where you would see a yellow sun grow larger, and then split into three going in different directions (equal angles). I even remember this being quite a strange and incorrect effect as a kid.

The closest movie I cam across in IMDB is 1976’s Into Infinity, produced by Gerry Anderson, and may have had that flavor to it, but the plot doesn’t mention anything about the bomb/sabotage/pending explosion.

So, can anyone confirm or offer an alternative answer?