One of the early Payload models in first fleet they Centuri Kc-20 Payloader-II was alway a great little 18mm motor workhorse. I used it often at Grade and Middle school flight demos showing youngsters some of the neat things that could be flown (other then animals and insects). Night lighting, acceleration graph/carbon paper plots, Locator buzzers...etc. My little 2.6X, T3(.375") diameter downscale won't quite allow the same experiments but does in fact have room for a single LED night flying fixture. At an Empty weight of 7.9grams with it's 1"x 15" Red Teflon streamer it comes back slowly from nice 100foot plus flights. Post copied with permission .