Core burner or nossled bottle rocket?

[insutama]

For a 1/4" bottle rocket what would be more effective nozzle less or nozzled I'm thinkin a nozzled rocket would be better for a small bottle rocket because it won't be lifting much of a payload maybe a gram max what do all you think

[calebkessinger]

In the 5/16ths size both work fine with a variety of fuels.

[insutama]

I'm trying to decide which one to buy what would be pros and cons of each

[nater]

I am confused, one can make a nozzled or nozzleless rocket on the same core burning spindle. Did you mean core burner or end burner?

[schroedinger]

Get the nozzled set. Bottle rockets even work fine with hot fuel and a nozzle.

[insutama]

yes sorry core burner or end burner

[dagabu]

End burners are just like they sound, they have a nozzle (usually clay) and the fuel grain burns from one end to the other, they are the design that ESTES rocket motors uses. They provide a longer thrust band at lower pressures and don't lift nearly as much weight.

 

Core burners again are just what they sound like and just like a nozzleless rocket, the fuel burs mostly at the same time along the core and burn much faster creating thrust very quickly but for a very short duration. Core burners too can have a nozzle while a nozzleless will have the fuel pressed all the way to the end.

 

For 1/4" SBR sets, the core is important, an end burner in this size is very tricky to get working properly.