I have seen discussion of the safety involved in starting motors after liftoff.
IMO (just mine)
1) If the main engine is more than sufficient to lift the vehicle to apogee, then it should not matter what type of electronics light the air-started outboards. If it works it will happen on que, if it doesn't, no harm.
2) When igniting another stage, then it is important the event happens when the vehicle is vertical so it can continue on the correct path.
Is there a ruling from NAR or TRA (at their own sanctioned events) that successive stages cannot be fired by basic timers? (that have no way of knowing which direction the nose is pointed)
IMO (just mine)
1) If the main engine is more than sufficient to lift the vehicle to apogee, then it should not matter what type of electronics light the air-started outboards. If it works it will happen on que, if it doesn't, no harm.
2) When igniting another stage, then it is important the event happens when the vehicle is vertical so it can continue on the correct path.
Is there a ruling from NAR or TRA (at their own sanctioned events) that successive stages cannot be fired by basic timers? (that have no way of knowing which direction the nose is pointed)