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Mark Weitkamp CX4
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Date: 3-26-2023
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Number of Hours: 6.00
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Manual Reference:
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Brief Description: stress testing motor mount
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I tested the motor mount using a chain fall and a crane scale to measure the force applied. I built a fixture that allowed me to use the same boards that made up the welding fixture. I removed all of the all-thread rods that held the two sides apart, so only the motor mount itself is connecting the two sides of the fixture. One side (the firewall side) is rigidly attached to the test stand, and the other side (the engine side) is pulled by a chain attached to the crane scale and the chain fall. I applied four pulls to the engine mount, one straight up, one straight down, one straight to the left, and one straight to the right. Then I attached a lever arm to the engine side of the mount, lever length five feet. then I applied a 200 pound pull to that lever, for a total rotational force of 1000 foot-pounds of rotational force. The straight pulls ranged from 1600 pounds to 2000 pounds. Following these tests, I took the motor mount out to the airport and verified that it still fits the firewall and still fits the engine, so no distortions were introduced by the testing stresses. I now feel completely confident in flying with this motor mount. I also used a newly-purchased tap to add threads to the gascolator in order to improve its mounting security.
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