I wanted a basic Payloader to haul an altimeter and purchased the Quest Payloader ONE. At the time I did not know the kit had through the wall fins. This made assembly idiot proof to assemble and a very strong fin joint. The Payloader One is the first rocket to go up at each launch and have flown this kit over 40 times in the last year and it is still going strong. My results with an Altimeter are as follows : A8-3= 124 feet, B6-4= 309 feet, C6-5=620 feet, and an Aerotech 18mm reloadable D13-7W screams it to 1362 feet.