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Does that actually make much difference they got up to a steady speed?
It makes a difference to accelerations and climbs, which is where annoying buggers are most annoying. Unless there's a huge difference in ability, it's hard for anybody to ride a following rider off their wheel at a steady speed on the flat.
The "unexploded ordnance" was just a boyish prank which, fortunately, didn't go wrong. In all probability, it was a dummy training round anyway, I don't think there was any live fire exercise in my dad's neck of the woods, but it's a better anecdote if you gloss over that and I'm not sure that anybody would have known the difference.
Does that actually make much difference they got up to a steady speed? Unless the point is trying not to sway the WW2 bomb enough.