Triangular black craft in broad daylight hovering high and then speeding off.

This sighting has stuck clearly in my memory for 20+ years although I only occasionally thought about it over the years as you hear about UFOs.  It was a sight where you instantly know this is something extraordinary and not what our brains are used to processing and seeing.  I never really investigated anything more about it over the years because the craft I saw was triangular and I never heard of anyone seeing such a thing.  Until yesterday.  I watched a cable special about the UFO incident in 2000 near St. Louis with the various officer sightings of a black triangular object.  I then checked the internet to see about sightings in Colorado at roughly the same time of mine.  I have goose bumps again to see so many similar sightings from seemingly credible accounts.  My story is brief but it left a permanent record on my mind.
 I can't remember the exact date but it was in the early 1980s and I was a passenger in a car with my brother driving.  We were on a small street road near our house and it was daylight and very clear.  As we were driving, I casually glanced at Pikes Peak which occupies a large part of the mountainous view in Colorado Springs.  Near the top (above treeline) and slightly to the right of Pikes Peak was a triangular black object that appeared to be rotating.  It was close to Pikes Peak and probably 5 miles from me - line of sight.  I could tell it was very large given its relative dimension to Pikes Peak just behind it.  Had this been at night I could have dismissed it as any possible craft but being a clear day I was instantly startled as to what this was.  I had a good familiarity with military aircraft with my father in the Air Force and growing up in Colorado Springs near the Air Force Academy.  As I stated, the fact that it was triangular and didn't seem to have any other discernable shape or markings, I was amazed at what this might be.  I immediately told my brother to look and even told him "stop the car" and look.  By the time he finished asking "what is it" and stopped the car, I watched it disappear at an incredible speed over and behind Pikes Peak.
 I never saw it or anything like it again but after reading these accounts I felt I had to add my story to the many accounts listed.  I am shocked to see many accounts even older than mine of similar sightings which indicates it could not have been any kind of experimental military craft.  I hope one day I can find out what it was and solve the mystery.
Source of report indicates that the date of the sighting is approximate.  PD