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- From: James_Hartman@calunet.com (James Hartman)
- Subject: Guitar Thruster
- Message-ID: <5813006.ensmtp@calunet.com>
- Sender: usenet@muns02.howpubs.com
- Nntp-Posting-Host: cnet
- Organization: CaluNET, Inc.
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- Date: Fri, 21 Jun 1996 06:04:18 GMT
- Lines: 86
-
- This report appeared in "NETWORK NOTES" Page 25
- of Electric Spacecraft Journal, Issue 17 Jan/Feb/Mar.
- Published March 4, 1996
-
- Source: James E. Hartman
- P.O. Box 612
- Griffith, IN 46319
-
- As an extension of previous experiments
- (ESJ 6, pp. 43-44)
- James E. Hartman has performed mechanical
- wave propulsion experiments with an audio
- speaker in water. Acoustical vibrations sent to
- the speaker to move slowly across the surface
- of the water. In these experiments, the power
- was deliberately kept low.
-
- To power the speaker, Hartman used a de-tuned
- electric guitar plugged into an ordinary, light
- weight, 10-watt amplifier. The speaker was placed
- over the surface of a 36-inch square, 12-inch deep
- tub of water. The 5-watt speaker had a diameter of
- 2 1/2 inches and weighed three ounces.
-
- The speaker was covered with a thin plastic
- membrane, which helped to support it and keep it
- dry. The membrane, then, was an intermediate
- medium through which the vibrations were
- transferred to the water and on which the reaction
- force of the water pushed.
-
- The smoothest, steadiest wave formations, and
- consequently good propulsion, resulted when
- strumming the low E string loosened somewhat
- out-of-tune. Higher frequencies were incapable of
- developing resonant wave forces, and lower fre-
- quencies led to turbulence, feedback and sputtering.
-
- Nothing happened when the speaker was
- submerged. When the speaker was placed face-
- down about 1/8 of an inch above the water, a
- symmetrical wave pattern developed which was
- incapable of imparting an unbalanced force to the
- speaker. The speaker had to be somewhat tilted
- on end to be propelled.
-
- Repeatedly, but not in every test, dark bands
- would appear in the otherwise steady wave
- pattern. They would appear with a frequency of
- approximately two-per-minute and last for about
- two seconds. They were visible when a fluores-
- cent light was shone at an angle of 20 degrees
- from the surface of the water.
-
- In previous experiments, with the speaker face-
- down on a flat, dry surface instead of water, it
- was necessary to use a bass guitar to reach fre-
- quencies sufficiently low to move the speaker.
- Furthermore, the bass had to be continually
- strummed if propulsion was to occur. Several
- investigations revealed that different chords
- would cause different types of motion. Chords
- were found to make the speaker jump, spin at
- different rates, and stop moving.
-
- Hartman believes that atmospheric electrody-
- namic means of propulsion might exist which are
- analogous to those demonstrated with sound
- waves.
-
- [NOTICE: Two photo's are not shown in ASCII FILE]
-
- * Should Science or Industry find a use for my concepts please
- do contact me.
-
-
- ---James Hartman
- CaluNET - Future Science Administrator
-
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- --
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