A Chronograph Watch Chronograph
Posted: Sun Aug 16, 2009 8:10 am
A Chronograph Watch Chronograph
I was thinking about carrying my laptop outside to utilize its sound card to record shots for fps measurements
Audacity is a terrific free program that allows you to see the sound graphs in fine detail and to calculate the velocity of your projectile.
As I was about to use the laptop I glanced at my watch, and I suddenly remembered that it has a built in MP3 recorder.
Darn if this isn't the simplest method to measure velocity with 2 thunks.
To increase the thud sound level at the plywood target I leaned an old aluminum pan against it as a rattle.
I paid about $40 for my watch about a year ago.
Mine has 1 Gb of memory and it can record 27 hours of audio.
It also has rechargeable batteries.
Highly recommended for a very accurate watch and for recording conversations without being obvious.
Check it out:
http://cgi.ebay.com/NEW-Sungale-WMP3218 ... 286.c0.m14
http://tinyurl.com/mdqpkp
UNGALE
Sungale WMP3218 128MB MP3 Watch w/ Earphones
Model: WMP3218-128
Condition: New
Description:
* 5-in-1 MP3 watch player: MP3, USB, recorder, watch & repeat
* Supports MP3 & WMA formats
* Citizen quartz mechanism
* 5 EQ modes
* Built-in, sensitive microphone for voice recording
* 3-10 ATM water-resistant
* Shockproof without sound jumping
* Red, yellow & green light indicators
* Up to 10 hours playback with built-in, Li-Ion polymer battery
* Stereo retractable earphone
* Stylish watch case & ashen dial design
* Comfortable leather wristlet
* Product Type: Flash MP3 Player
* Product Features: Voice Recorder
* Flash Memory Capacity: 128MB
* Audio Formats: MP3, WMA
FWIW Any portable MP3 recorder will work fine.
Place it midway between the muzzle and the target.
Measure the time interval in seconds with Audacity and divide it into the distance in feet.
For example: time is .1 second and distance is 10 feet.
10/.1 = 100 fps.
BoyntonStu
I was thinking about carrying my laptop outside to utilize its sound card to record shots for fps measurements
Audacity is a terrific free program that allows you to see the sound graphs in fine detail and to calculate the velocity of your projectile.
As I was about to use the laptop I glanced at my watch, and I suddenly remembered that it has a built in MP3 recorder.
Darn if this isn't the simplest method to measure velocity with 2 thunks.
To increase the thud sound level at the plywood target I leaned an old aluminum pan against it as a rattle.
I paid about $40 for my watch about a year ago.
Mine has 1 Gb of memory and it can record 27 hours of audio.
It also has rechargeable batteries.
Highly recommended for a very accurate watch and for recording conversations without being obvious.
Check it out:
http://cgi.ebay.com/NEW-Sungale-WMP3218 ... 286.c0.m14
http://tinyurl.com/mdqpkp
UNGALE
Sungale WMP3218 128MB MP3 Watch w/ Earphones
Model: WMP3218-128
Condition: New
Description:
* 5-in-1 MP3 watch player: MP3, USB, recorder, watch & repeat
* Supports MP3 & WMA formats
* Citizen quartz mechanism
* 5 EQ modes
* Built-in, sensitive microphone for voice recording
* 3-10 ATM water-resistant
* Shockproof without sound jumping
* Red, yellow & green light indicators
* Up to 10 hours playback with built-in, Li-Ion polymer battery
* Stereo retractable earphone
* Stylish watch case & ashen dial design
* Comfortable leather wristlet
* Product Type: Flash MP3 Player
* Product Features: Voice Recorder
* Flash Memory Capacity: 128MB
* Audio Formats: MP3, WMA
FWIW Any portable MP3 recorder will work fine.
Place it midway between the muzzle and the target.
Measure the time interval in seconds with Audacity and divide it into the distance in feet.
For example: time is .1 second and distance is 10 feet.
10/.1 = 100 fps.
BoyntonStu