I think the 1/4A in BT5 flys just slightly higher then a 6.5mm MMX rocket [not using plastic]
I think the idea when they came out If I recall correctly was the plastic parts of the Quest rockets tended to keep it under 50 feet in your backyard. [I still have a Little Joe II Set, I had 4 of them but sold the rest] I also remember MiniBrutes made of plastic in the early 70's I could keep in my front yard; like the X15
I still have MMX motors and ignitors, but I would think BT5 is easier to work with; your experienced comments welcome.
I think the idea when they came out If I recall correctly was the plastic parts of the Quest rockets tended to keep it under 50 feet in your backyard. [I still have a Little Joe II Set, I had 4 of them but sold the rest] I also remember MiniBrutes made of plastic in the early 70's I could keep in my front yard; like the X15
I still have MMX motors and ignitors, but I would think BT5 is easier to work with; your experienced comments welcome.