MWJ Posted August 22, 2014 Share Posted August 22, 2014 I have 1/2" tooling for end burner rockets and I want to lift a 15 gr. 1.75" shell. Can it do it? I guess I could just try it but I don't want it to shoot stars all over my grass field. Thanks,Mike Link to comment Share on other sites More sharing options...
nater Posted August 23, 2014 Share Posted August 23, 2014 Probably not. It might lift it with hybrid fuel, but I would not trust it with BP without some testing first. You can make a test stand out of a mechanical kitchen scale and a mount for the motor. Use a video camera on the scale, burn the motor and use the video to verify the peak thrust on the scale. You will want a 10:1 thrust to total weight ratio. This includes the weight of the completed motor with stick and header. Link to comment Share on other sites More sharing options...
ddewees Posted August 23, 2014 Share Posted August 23, 2014 Depending on your bp, I think you'll be fine. 15g isn't very much. Just test it in a safe location. Link to comment Share on other sites More sharing options...
schroedinger Posted August 23, 2014 Share Posted August 23, 2014 Just make up a motor and put a sand filled bag header of that weight on top. Then you know, but normally it shoud lift that weight. Link to comment Share on other sites More sharing options...
Maserface Posted August 23, 2014 Share Posted August 23, 2014 Personally, I never trust a rocket to go where I want it. I have to be sure that if it hits the ground (and I always assume it will), that I'm not gonna be responsible for a massive fire. How much tit does your tooling have? A lot of "end burners" these days aren't really end burners, this could make a big difference in what you can lift Link to comment Share on other sites More sharing options...
dagabu Posted August 23, 2014 Share Posted August 23, 2014 Intrusion into the powder by about 1/8", a true endburner set. 15g is a lot for that small motor, I usually lift 2-3g max. Link to comment Share on other sites More sharing options...
PyroCube Posted August 23, 2014 Share Posted August 23, 2014 Commercial rocket motors with 14mm ID can easily lift 50-80g to a good heightso I suppose 15g should be doable with 12.5mm ID.(Why aren`t you US people using the metric system btw? Would be alot easier ) Best regards Link to comment Share on other sites More sharing options...
pyroman2498 Posted August 23, 2014 Share Posted August 23, 2014 Commercial rocket motors with 14mm ID can easily lift 50-80g to a good heightso I suppose 15g should be doable with 12.5mm ID.(Why aren`t you US people using the metric system btw? Would be alot easier ) Best regardsI use a core burning 4oz tooling a can lift just at 15g so I'm gonna go with no it won't lift it well , and commercial rockets are much different than our hobby rockets.We don't use the metric because we are to lazy to change ( all though I prefer the metric over our "standard" ) Link to comment Share on other sites More sharing options...
dagabu Posted August 23, 2014 Share Posted August 23, 2014 Commercial rocket motors with 14mm ID can easily lift 50-80g to a good heightso I suppose 15g should be doable with 12.5mm ID.(Why aren`t you US people using the metric system btw? Would be alot easier ) Best regards Yankees voted the metric system down in the 1970's (bunch of morons). Commercial rocket motors are made with a hybrid fuel and a deeper core, like a mix of both an endburner and a core burner. I would love to find the way they do that! Link to comment Share on other sites More sharing options...
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