Nice rocket build. I would discard the heavy plastic twin 18mm motor mount and make it triple 18mm motors. 3× BT-20's fit inside a BT-60 perfectly, just add another motor mount and fill between the triple clustered body tubes with glue and wadding as DIY flame proof putty. Let the motor mount tubes protrude from the aft end about 1/2".❤
Mr Thomas. Where can i get the design software? I have been wanting to build my own rockets for a while. Thank you Sir...great vids btw clicking subscribe now