#11
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Those pictures look like they are paper casings like Estes - they might be end burners or drilled out core burners
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Did the chicken really cross the road, or did the road move beneath the chicken? Albert Einstein You Can't break the laws of physics but they can break you. Christine McKinley Dale Greene Mentor, Penn Manor Rocket Club VISIT SPAAR 2010 Calder Cup The Old West 2009 Calder Cup " Speaking the Truth in times of universal deceit is a revolutionary act. " George Orwell |
#12
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If you can draw the general shape of the thrust curve, we can probably tell what type they are.
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#13
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The casings on these engines are rock solid and are nothing like Estes paper tubes. Here is a representative picture of the flame coming out the engines. The picture is blurred. In real life the impulses are seen much more clearly. The exhaust flame looks fantastic
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Leo My rocket fleet and more @ Leo's Leisure Site and on YouTube - My latest project: ALTDuino |
#14
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German Market
That is bad to hear about one manufacturer going out but good to hear about a new one coming in. I would like to ask on the price difference between the German motors and Estes, how much is tarrif and duties and how much is actual price? In the late 70's we(FSI) started doing a limited business in Germany. The importer's name I believe was Wolfgang Carstien. Forgive me if the spelling is off. Very nice man. I remember hearing the price was going to be much higher in Germany over USA. Please keep everyone informed with the new motors and their performance.
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#15
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I actually have 1 unused 1982 FSI engine purchased from Wolfgang Carstens.
(As reference an Estes C6-7 pack costs 10.49 Euro = $14.97)
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Leo My rocket fleet and more @ Leo's Leisure Site and on YouTube - My latest project: ALTDuino |
#16
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German Market
That is very cool Leo.
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#17
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Here the thrust curves of the pictured (-1) engines:
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Leo My rocket fleet and more @ Leo's Leisure Site and on YouTube - My latest project: ALTDuino |
#18
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Obviously an interesting propellant. End burning with the small core at the nozzle end that produces the peak thrust, just like Estes black powder motors. Could this propellant be similar to the Widowmaker propellant? Those were endburners.
The nozzles in the photos look interesting. Are they poured in or pressed in during motor loading? Is the tiny core and the nozzle formed during loading or are they drilled post loading? I wonder if these have any automated loading or assembly steps or if they are hand made? Of coourse, the propellant could be a pressed composite instead of a poured and cured composite. I look forward to more details or comments from motor making experts.
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-Fred Shecter NAR 20117 (L2) Southern California Rocket Association, NAR Section 430 |
#19
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according to the Widowmakers brought back by Bernie Biales in the 1972 MIT Journal the Widowmakers were composed of potassium picrate, ammonium perchlorate, and nitrocellulose. propellant chemistry has greatly improved since then so I doubt that these new German composites contain any NC or picrates.....BAM would never ok them. They are considered primary and high explosives. I would make an educated guess they are simply APCP. I'm nowhere near a motor making expert (although I will play one for a few seconds here) but I would also guess that since they are endburners and they use paper cases with a composite propellant the propellant probably burns as fast as typical BP and that the chamber pressures are < 300-400 psi. As far as the rest of your questions, Leo might be able to answer them or Robert Klima, the manufacturer could I'm sure. His phone number is on the web at his website. When these were first announced at the Nuremberg 2011 Toy Fair I thought I read they were pressed composites. By pressed I also mean granulated as thats how the APCP in the Czech Rapiers were made and they were essentially long duration endburners. I could be wrong. In fact all my guesses above could be wrong as they are pure speculation. Hey Leo...how about an interview with Robert Klima? Terry Dean
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#20
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Send me your questions via PM and I'll see what I can do.
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Leo My rocket fleet and more @ Leo's Leisure Site and on YouTube - My latest project: ALTDuino |
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