Scorpion812 Posted August 3, 2017 Posted August 3, 2017 Hi everyone,I am currently trying to come up with a simple endburner rocket design that uses tubes made from amazon packing paper with an inner diameter of 1.4cm. i am using 60 40 kno3 sucrose as fuel and bentonite as nozzle and bulkhead material. What kind of kraft papaer should i use?And how long do my nozzles need to be 1
NeighborJ Posted August 3, 2017 Posted August 3, 2017 Endburners require a high quality tube to prevent burnthrus. The best paper is virgin paper, I use manilla file folders for small motors because they are thick yet not to tough to work. Ideally the nozzle choke should be as thin as possible (2-3mm) and where it meets the tube wall should be close to one tube diameter. Jason
Mumbles Posted August 3, 2017 Posted August 3, 2017 KNO3/Sugar fuels are also fairly difficult to get to work as end burners. They tend to work much better as core burners. If you're talking about the white-ish packing paper, I'd look for something else. It's blank newsprint and does not have much strength at all. At the very least find some recycled kraft paper. It's still not as good as virgin kraft, but significantly stronger than newsprint. In general nozzles will be 1/2 to 1 full ID long. Depends on a lot of factors. These are things you will have to tackle after getting decent strength tubes and a functional fuel and fuel configuration.
Apocaloptigon Posted November 22, 2017 Posted November 22, 2017 I have to agree with mumbles. I've made a few paper rockets with virgin kraft paper and various others, all are as strong as I can find around the house and they all work pretty well (actually one of them burst into flames before I wanted but nevERMIND THAT). White packing paper seems to work as long as you make it thick enough.
dagabu Posted November 22, 2017 Posted November 22, 2017 Hi everyone,I am currently trying to come up with a simple endburner rocket design that uses tubes made from amazon packing paper with an inner diameter of 1.4cm. i am using 60 40 kno3 sucrose as fuel and bentonite as nozzle and bulkhead material. What kind of kraft papaer should i use?And how long do my nozzles need to be Why not pound a clay nozzle? The tooling is cheap, the clay is nearly free...
stix Posted November 23, 2017 Posted November 23, 2017 KNO3/Sugar fuels are also fairly difficult to get to work as end burners. They tend to work much better as core burners. Yep, as Mumbles suggested core burners work much better with sugar fuels because they generally burn slower than bp. You can however, make small end burners work with the addition of approx. 1% Red Iron Oxide. I've tested with repacking a spent Estes C6, worked great, but I haven't tested anything larger. Cheers.
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