A SECRET WEAPON FOR WHICH IS THE CLOSEST ANTONYM FOR THE WORD NASCENCY

Is there any reason aside from politics why all Tips for nuclear pulse propulsion have already been deserted?I feel There's a rule (with exceptions, certainly) about once the "ch" is throaty and when it is actually mouthy. Soon after an "open up vowel" like "a" the "ch" us generally "throaty", following a "shut vowel" like "i" it is usually "mouthy