Cl(VII)
Chris Bender
All charges will be controlled by a pair of RRC3 altimeters. I know the thinking about using two different types/brands of altimeters, but I would rather go with the altimeters I have experience and comfort with. To me there is more of a chance that I will mess up with a new altimeter than the altimeter will mess up on it's own.
The best way to describe how the altimeters will be supported is with a picture:
The altimeters are mounted to Missileworks 3D printed sleds (54 mm variety), and will be therefore supported by 2 rods. They will be held in place by lock nuts above and below on a single side of the sled, so that the threaded rod they are on can be screwed into the T-nuts in the aft CR once the bulkhead is installed (makes more sense when I get to the pics). This setup allows the altimeter, ematches, and charges to be completely prepared outside the rocket and the entire assembly loaded together.
The inner tube of the bay is a spare piece of 4.1" Magnaframe left over from my L2 build, Arapahoe-J (soon to earn a name change with a K-flight). The aft CR has 4 holes that do not go all the way through, into these was epoxied (5 min) 10-24 T-nuts. These will accept the threaded rod holding the altimeters. These do not have to pass all the way through as they will not be carrying the bulk of the load upon ejection, that will be handled by 2 pieces of 1/4-20 all thread. The roughed up magnaframe was then epoxied into the CR with Aeropoxy, a square was used to ensure that it was, well, square. The next day an Aeropoxy fillet was put on the joint.
Before gluing the assembly into the rocket a test fit was in order, with and without altimeters. Note: I will either be mounting the magnetic switches differently in the finished rocket, or I will use rotary switches. Haven't decided, but the clearances are fine for either of these solutions.
The all thread that the altimeters are mounted on have been turned into long bolts by the application of some red threadlock to the cap nuts that top them off. Note: every "permanent hardware attachment has some red threadlock in it.
The best way to describe how the altimeters will be supported is with a picture:
The altimeters are mounted to Missileworks 3D printed sleds (54 mm variety), and will be therefore supported by 2 rods. They will be held in place by lock nuts above and below on a single side of the sled, so that the threaded rod they are on can be screwed into the T-nuts in the aft CR once the bulkhead is installed (makes more sense when I get to the pics). This setup allows the altimeter, ematches, and charges to be completely prepared outside the rocket and the entire assembly loaded together.
The inner tube of the bay is a spare piece of 4.1" Magnaframe left over from my L2 build, Arapahoe-J (soon to earn a name change with a K-flight). The aft CR has 4 holes that do not go all the way through, into these was epoxied (5 min) 10-24 T-nuts. These will accept the threaded rod holding the altimeters. These do not have to pass all the way through as they will not be carrying the bulk of the load upon ejection, that will be handled by 2 pieces of 1/4-20 all thread. The roughed up magnaframe was then epoxied into the CR with Aeropoxy, a square was used to ensure that it was, well, square. The next day an Aeropoxy fillet was put on the joint.
Before gluing the assembly into the rocket a test fit was in order, with and without altimeters. Note: I will either be mounting the magnetic switches differently in the finished rocket, or I will use rotary switches. Haven't decided, but the clearances are fine for either of these solutions.
The all thread that the altimeters are mounted on have been turned into long bolts by the application of some red threadlock to the cap nuts that top them off. Note: every "permanent hardware attachment has some red threadlock in it.
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