I'm planning to launch my Golden Scout this week. I found some old engines I had from the 70's & 80's
They are 13mm as follows:
Estes

A3-4T (1 3/4 " Long)

Aerospace Vehicles Inc
Mineral Point,Ws ( My memory about this company is really vague. I remember having these motors but nothing stands out about the company)

A3-2M (2 1/4" Long)
B3-3M ( same)


Will they work with a little adapting?