fishman100 wrote:I've seen a few rockets with water bottle/cup nose cones (there's one in the Image gallery, IIRC) and those tended to have a lower time than those built with another material, such as the wrapping paper.rishj09 wrote: My coach said that cones will break after one flight..... so we use small water bottles all the way up to the top.
The nose cone will break depending on a variety of factors; CG and CP (which ultimately affect the flight of the rocket), wind, landing, etc. If your rocket is made of a fragile material then it's more susceptible to breaking than a sturdier material, but a heavier material for the nose cone will shift the CG. Also if the rocket nosedives then yes the cone will most likely break (our rule was if the nose cone was still intact upon a nosedive, then it's too strong).
How are you connecting the water bottles? Tape? Are you experiencing stability problems with your nose cone?
We use tape.... and our rockets get about 15 sec per flight