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Sugar Rocket Motors Are Underpowered


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#21 dagabu

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Posted 07 December 2018 - 12:35 PM

Sugar rockets, MM?

 

I have to say that my experiences differ from that, when making a sugar rocket with bates grains, I have found a core as small as 2 mm is enough to get the 'fire going' but it does not increase the pressure at all, the surface is just too small to build that kind of pressure. 

 

Now... if you are combining the core with the nozzle diameter then I understand but the two may not correlate. In fact, pressing a sugar rocket with the proper nozzle then using a rod to make the core smaller than the nozzle diameter is a good way to 'sneak up' on getting a very light rocket off the pad without blowing the fins off. No need to match them up size for size. 

 

rgrains1.gif

 

fmotor02.gif


Edited by dagabu, 07 December 2018 - 12:41 PM.

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#22 dagabu

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Posted 07 December 2018 - 01:19 PM

KG7UAT,

 

There is a lot of things to consider when making sugar rockets, from casing selection to nozzle material, from chemical grinding to grain pressing etc. I strongly suggest you read through Jacobs site HERE and and James site HERE .

 

They both have loads of information and can help you forge your way through all the information and come up with an idea that works for you.

 

One note I would like to make before hitting the post button, PVC is a horrible casing material. A lot of people argue that it is not but considering that it shatters when over pressured, becomes plastic (soft) at 200 degrees F and will never hold a bulkhead long enough to get a good burn, I would look at paper for your trials. 


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#23 KG7UAT

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Posted 07 December 2018 - 02:52 PM

Thanks that should be very helpful as well!



#24 stix

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Posted 08 December 2018 - 06:37 AM

Put safety at the top of the list.

 

Whatever interesting and enjoyable reasons, please be careful.


  • KG7UAT likes this

I just start the conversation - someone else has to question them.





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