VikingPyrotechnics Posted August 16, 2014 Posted August 16, 2014 I was was looking for a motor that brings my 3 "balls on a good height, but the flight characteristics of a Endburn Motor ( slow wuuuushing flight ). I think I'm on the right track.......... https://www.youtube.com/watch?v=6AWgQRv9nLc This was my firts try with these Motors, so have to do a little work on them. Should be flying 1-2 more seconds to get the shell where i want.Shell weight about 200gramms + about 50gramms for the stick. With those waxed tubes, i can use a bit hotter fuel i think ?! ( i used 65-25-10 ) GreetsVP 1
PyroCube Posted August 16, 2014 Posted August 16, 2014 Nice Rocket, finally someone who tries to get a good amount of thrust out of a endburner You only used 65/25/10? Normally in endburners the hotter the fuel the better...But it`s amazing how much performance you got with this "slow" fuel Greets
VikingPyrotechnics Posted August 16, 2014 Author Posted August 16, 2014 Thank you Yepp i like the way endburners fly, more than coreburner. This is why i´m lookin for some good powered endburners. Yes, just 65-25-10. I think i can go up to 70-20-10. I´m also experemanting with a tool for 25mm Endburner for 4" ball shells.... But this will take a bit time to dial everything in
schroedinger Posted August 16, 2014 Posted August 16, 2014 Is your end burner tool a normal end burner tool, or does it maybe have a couple cm of core to first build up some pressure.
FlaMtnBkr Posted August 20, 2014 Posted August 20, 2014 And what diameter nozzle? I like to use as hot of BP as I can and then slow it down to the speed you want with a spark producing material. Probably coarse charcoal for this style rocket. A 'nitrated' charcoal might work best with this method? I figure if I'm starting with the hottest BP, I can get the best tail by adding the most extra material. Just a thought.
mabuse00 Posted August 20, 2014 Posted August 20, 2014 Endburners rule, that's for sure. The 22mm Egertubes rule too, unfortunately they are so short... I found that I can use hot BP and even a 1/5 instead of 1/4 id nozzle without failures. Without a tool, I just drilled nozzle + 1/2 id into the fuel. No de Laval style shape. If extreme performance is desired, one could also consider whistlemix. A german company just brought a new series of model rocket engines on the market, they are based on whistlemix and have a 1/5 id nozzle. A 14mm id motor with 20g of fuel is supposed to cope with 300g AUW. I don't understand why most commercial tools seem to settle on 1/4 id.
a_bab Posted August 21, 2014 Posted August 21, 2014 Companies will always go for reliability. While we can afford a CATO they don't. Few years back some British company made some engines that turned out to be "salutes on a stick". I would love to see how the Zink fat motors are actually made: I guess they are made of Al, and are of cored type?
schroedinger Posted August 21, 2014 Posted August 21, 2014 Well thinking about that, some years ago i had about a hundred whistle rockets from a german company, about 10-12mm i.d. 25% of them where bombs on a stick, you really had to step a couple meters back from them. One year later they stopped producing these
VikingPyrotechnics Posted August 29, 2014 Author Posted August 29, 2014 Ok guys........ My tool got a little spindle to get things goin faster at the start. If i used hot BP, these motors blow up at the ground. Here is another motor test with a 3" ball shell. Shell and stick weight about 210 gramms......... https://www.youtube.com/watch?v=v8cgQeAftc0 GreetsVP
schroedinger Posted August 29, 2014 Posted August 29, 2014 So looks like you are giving them a god whack at the beginning to overcome the inertia and then keep em steady going. If don't use your fast powder, what are you using instead?
VikingPyrotechnics Posted August 29, 2014 Author Posted August 29, 2014 It´s 65-25-10 with good charcoal :-) I think i can go up to 70-20-10, but for the moment i have no need for it........
schroedinger Posted August 29, 2014 Posted August 29, 2014 Sounds awesome, Charcoal your homemade pine?
VikingPyrotechnics Posted August 29, 2014 Author Posted August 29, 2014 No, i used homemade poplar charcoal :-)
MWJ Posted September 7, 2014 Posted September 7, 2014 Very nice VP! That's the same thing I'm trying to do now. Shoot a ball shell with an end burner.
schroedinger Posted September 7, 2014 Posted September 7, 2014 No, i used homemade poplar charcoal :-)Allready thought about those too, but never used it as i have a nice source for willow and alder. Do you experience with those and how do they compare to the popplar BP?
VikingPyrotechnics Posted September 18, 2014 Author Posted September 18, 2014 Ok, i played a bit with these motors. :-)I glued 2 of them together and wanted to see how high they will go So let see.......... https://www.youtube.com/watch?v=is_aIle_kD0 I think about 300 meters
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