I launched an Estes Trajector rocket (sans stickers, and other nonsense) with a booster stage. First launch (without on-board camera) flew much higher and straighter then t' second one. I used F15-0/F15-6 Engines on both flights. Blimey! T' first launch went above t' low clouds so I couldn't see t' parachute ejection t' judge t' delay time.