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Written by Tony Vyverman
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maandag, 24 september 2007 |
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Page 1 of 2
The P100-1 is a 100 mm caliber KNO3-sorbotol motor. A similar motor but filled with KN(65%)SU(17,5%)SB(15%) was tested in 2002. During that test severe damage of the aluminum shells which contain the propellant, was found. Unfortunately no thust was registered at that time. Recent tests with KNSB58 motors have shown that protection of the shells with 0.5 to 1 mm of parabond is very efficient.
The test was executed on May 06, 2007.
The motor has the following characteristics :
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Mass propellant in gr (4 segments)
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1615/1652 /1638 /1640 – total: 6545 g
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Composition propellant
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KNO3 :65%, SORBITOL : 35%,
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Type grains
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Bates: 4 segments
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Dimensions of the grains
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length : 173.5 / 178.5 /179.2/182.1 mm
inner diameter : 42.0 mm (slightly conical: 0.5°),
outside diameter: 90.9 mm
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Density propellant
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1.825 / 1.798 / 1.788 / 1.792
mean value: 1,80
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Distance between two grains in mm
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18.5 / 13.5 / 12.8 / 10
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Mass ignitor powder: Zn-S powder
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120 g
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Compostion ingnitor powder
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Zn : 75 % : S : 25 %
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Length combustion chamber
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768.8 mm
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Dimensions nozzle
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Dc : 100 mm / Dt : 38 mm / De: 62.5 mm
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coating
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Aluminum shells of 2 mm thick coated at the inside with parabond of 0.55 mm (total mass 182 g)
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Case thickness
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2 mm
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Material case
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steel
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For the manufacturing of the 4 grains a melting system, manufactured by Leopold Clauwaert, was developed. This system is a larger version of the one developed for the test with KNSB5-3. It allows the application of vacuum. The following procedure was followed: both ingredences were mixed as powder prior to melting and poored into the preheated melting system. The temperature of the oil bath never exeeded 119°C during the whole process. The melting of the propellant took about 70 to 90 minutes after which vacuum of about 0.1 bar was applied by means of a waterpump.
For this motor KNO3 of normal grade and neutral pH was used (no Haifa GG as was the case in KNSB58-3) and hence no ascorbineacid had to be added to the sorbitol.The KNO3 was grinded for 5s in a coffee mill.
The central rod was dismanteled after 1 to 2 days. For the dismantling use was made of an hydraulic pump in order to generate sufficient force.
 Figure 1: the melting system 
The density of each of the grains was very close to 1.8 . Only minor deviations were measured.
The ignition was realised with an ignitor similar as for all KNSB58-1 to 3 tests (see figure 5). It consists of a small steel tube of 10 mm in diameter provide with a large number of holes of 1 mm, over the whole length and filled with zinc-sulfur powder (3/1). These holes are covered with cellophane tape to prevent powder to flow out of the ignitor. Ignitor and diaphragm are one piece and the burstpressure was set to 30 bar. The ignitor left the motor at the same time as the diaphragm.
 Figure 2: 3D view of motor
 Figure 3: motor and ignitor before the test
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Last Updated ( dinsdag, 30 oktober 2007 )
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