Looking at some longburn clusters for my 4-29SS when warmer weather returns. How well does a CTI Mellow light in a situation like that? Considering the 3-grain 29mm G33's and the 4 grain H42's.
-Hans
CTI motors with starter pellets start promptly, but you have chosen 2 pairs of low thrust motors and you want to take-off on only 2. If one of the two motors does not ignite on lift-off, Houston you have a problem because the rod velocity is too low for a stable flight trajectory, so it's a no go by range safety rules for the following reasons.
The pad weight of your rocket will be at least 4.25 pounds and it is a complex J impulse rocket that requires a 200' pad separation distance. You propose to install (2) Pro29 3G 143G33 Mellow and (2) Pro29 4G 186H42 Mellow motors, and lift-off on 2 motors and then air-start the other 2.
Sorry but this flight, as proposed, is a no go by flight safety rules because: should you choose to launch on 2 G33s, your one engine out lift-off velocity is only 21 fps with an 8' rail (7' guidance length) and the rocket will be unstable; or should you choose to launch on 2 H42s, your one engine out lift-off velocity is only 28 fps with an 8' rail (7' guidance length) and the rocket will be unstable. The result of a timer-based air-start of either one or two of the remaining motors would result in an extremely dangerous horizontal or land-sharking trajectory.
The only safe way to launch this rocket with this motor combination is to ignite all 4 motors on the pad. Provided that at least 2 of the four motors ignite, the rocket will reach sufficient altitude above the rod to safely recover.