Happy-flier From Canada, joined Dec 1999, 299 posts, RR: 0 Posted (7 years 8 months 22 hours ago) and read 8380 times:
Anyone know what the bypass ratio was in the rear-fan-stage CJ-805-23 that powered the Convair 990? I have been looking around but could not find this info online.
Interestingly, there are some rare videos on Youtube of a Spantax CV990 in operation in its twilight years. Like most, I had never heard or seen one flying, so it was nice to finally get a chance. Here are some interesting ones:
Boeing767mech From United States of America, joined Dec 2000, 1037 posts, RR: 2
Reply 5, posted (7 years 7 months 4 weeks 17 hours ago) and read 8221 times:
Quoting Happy-flier (Reply 3): They must have done something to modify the core because as you can see in the videos above, the Spantax 990 was actually a pretty clean burning jet - not much smoke at all.
The reduced smoke was a result of the miltary wanting to reduce the smoke from the J-79's. GE found by welding some of the cooling holes in the burner can you increase the temp of the flame which reduces the soot. The added bonus was the increase in thrust. My friend was a crew chief on a f-4 that had one engine with a ashless can and a regular engine, he said it was interesting to see on finally appoarch.