I usually use these with the 7 second delay on days when the wind is calm and I can send my smaller rockets up to high alitudes without worring about them drifting off. Last weekend however I traded the 7 second delay for a pack of these with the 4 as I had severalheavier rockets that I wanted to launch but it was too windy for my 29mm F motors. I fitted an adaptor amd used one of these and I have to admit, I was pretty surprised at how fast it left the pad.

The delay was spot on as the rocket was just arcing over at appogee. I ended up having to walk for a bit to recover it as the altitude was more than I expected. I have probably used these motors several dozen times and have never had a problem with them. They seem to light easy with both the Surefire and the Copperhead igniters.