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  1. #1
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    Anybody in SLC got a speed gun I can borrow?

    I gotta help my kid do his science project, and we need a speed gun. Anyone got a radar gun or something I could borrow this weekend?

    Thanks guys
    sigless.

  2. #2
    Join Date
    Mar 2017
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    SLC, Utah
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    paging zzz

    he's a firefighter, which is, y'know, like a cop

    .... right??

    Sent from my Pixel 8 Pro using Tapatalk

  3. #3
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    Feb 2005
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    A stopwatch and some math should work. I can't see how any kid project would require such a pricy piece of equipment. Or even a couple of phones with timestamps for video.
    Is it radix panax notoginseng? - splat
    This is like hanging yourself but the rope breaks. - DTM
    Dude Listen to mtm. He's a marriage counselor at burning man. - subtle plague

  4. #4
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    endlessseason has one
    Merde De Glace On the Freak When Ski
    >>>200 cm Black Bamboo Sidewalled DPS Lotus 120 : Best Skis Ever <<<

  5. #5
    Join Date
    Feb 2005
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    There are speedgun apps too, along with gps speedometers.
    Is it radix panax notoginseng? - splat
    This is like hanging yourself but the rope breaks. - DTM
    Dude Listen to mtm. He's a marriage counselor at burning man. - subtle plague

  6. #6
    Join Date
    Jun 2020
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    in a freezer in Italy
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    Just drive right next to whatever it is, it'll be fine.

  7. #7
    Join Date
    Oct 2015
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    2,877
    https://www.pocketradar.com/?gclid=E...SAAEgJBNvD_BwE

    I’ve got one of these. It may work for you depending on what you need.

  8. #8
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    ^^^ sick, that might work. we are going to be measuring top speed of an rc car. well be adjusting gearing to find the fastest top speed and where motor temps stay below 180f.

    well be using this car, it is 15-20lb object.
    We expect to see speeds ranging from 40mph to 70mph on a straight stretch of road out by the warehouses.
    We've contemplated using my watch or my bike computer to grab speed via GPS, but I don't want to wreck those things.
    We have a small handheld infrared temp gauge.

    Now that I think about it, a watch type gps sensor might work better than a speed gun or radar setup because we will run the car back and forth on the set distance until we see the temp stabilize on the motor. If the motor passes 180f, then we will stop the run and cool off. Watch will automotally log top speed for each run. Ok. Click image for larger version. 

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    sigless.

  9. #9
    Join Date
    Oct 2015
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    2,877
    I just tested it with my son’s rc car and couldn’t get a reading. His car is smaller and slower than yours though, so if you want to try it you’re more than welcome.

  10. #10
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    It would be fun to try and will give us options on our testing.
    I'll shoot you a pm.Click image for larger version. 

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    sigless.

  11. #11
    Join Date
    Oct 2003
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    Ogden
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    Quote Originally Posted by tgapp View Post
    paging zzz

    he's a firefighter, which is, y'know, like a cop

    .... right??

    Sent from my Pixel 8 Pro using Tapatalk
    I'm offended.

  12. #12
    Join Date
    Dec 2008
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    Quote Originally Posted by zion zig zag View Post
    I'm offended.
    Hey! haha. BB lemme make some calls.

  13. #13
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    Word.
    sigless.

  14. #14
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    Sep 2005
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    Quote Originally Posted by Buster Highmen View Post
    endlessseason has one
    ^^^^^^^

    it's not like the guy has an annual speed trap thread or anything
    "fuck off you asshat gaper shit for brains fucktard wanker." - Jesus Christ
    "She was tossing her bean salad with the vigor of a Drunken Pop princess so I walked out of the corner and said.... "need a hand?"" - Odin
    "everybody's got their hooks into you, fuck em....forge on motherfuckers, drag all those bitches across the goal line with you." - (not so) ill-advised strategy

  15. #15
    Join Date
    Mar 2008
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    northern BC
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    Isnt there something cheap from china or sft ? every year the ski club some how borrows a gun from the RCMP for the down hill
    Lee Lau - xxx-er is the laziest Asian canuck I know

  16. #16
    Join Date
    Mar 2014
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    It's Full of Stars....
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    Quote Originally Posted by zion zig zag View Post
    I'm offended.
    As you should be.

  17. #17
    Join Date
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    OP velocity=change of position as a function of time

    Speed=distance/time Measure out a speed trap. Or get a surveyor to measure one with an edm or static gps. Or go some place this has already been done, like a couple property pins you know the distance to 0.01' along a road.

    Timers are cheap enough to make, and there are a lot of different approaches one could take for a speed trap.


    A big chunk of the science of statistics is involved with the fact that there is no such thing as a perfect measurement of anything. Tldr of this is that measurements of something like speed are rendered much more precise if one repeats measurements as many times as is practicable, then finding the standard deviation, rms, mean, average, or some other appropriate statistical function that measures how well you measured the original values.

  18. #18
    Join Date
    Sep 2001
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    Orangina
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    Download speedometer app. Tape it to car. It'll work.

    Sent from my SM-S918U1 using Tapatalk
    "All God does is watch us and kill us when we get boring. We must never, ever be boring."

  19. #19
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    Quote Originally Posted by The Reverend Floater View Post
    Download speedometer app. Tape it to car. It'll work.

    Sent from my SM-S918U1 using Tapatalk
    This thing will likely wreck more than once tomorrow at high speed. I use my phone for work and other things, I need my phone. Not strapping that sucker in the car.
    Advanced speed detection technology has been procured.
    We will use a GPS watch tightly strapped in as a secondary speed measurement device.
    sigless.

  20. #20
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    Jan 2008
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    Big Sky/Moonlight Basin
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    Subscribing to this thread.


    Sent from my iPad using TGR Forums
    "Zee damn fat skis are ruining zee piste !" -Oscar Schevlin

    "Hike up your skirt and grow a dick you fucking crybaby" -what Bunion said to Harry at the top of The Headwaters

  21. #21
    Join Date
    Sep 2006
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    6,402
    Fast forward a couple years.

  22. #22
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    Quote Originally Posted by basinbeater View Post
    This thing will likely wreck more than once tomorrow at high speed. I use my phone for work and other things, I need my phone. Not strapping that sucker in the car.
    Advanced speed detection technology has been procured.
    We will use a GPS watch tightly strapped in as a secondary speed measurement device.

    Measure twicet, cut oncet.

  23. #23
    Join Date
    Feb 2005
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    The science lesson perhaps is: FULL SEND.
    Is it radix panax notoginseng? - splat
    This is like hanging yourself but the rope breaks. - DTM
    Dude Listen to mtm. He's a marriage counselor at burning man. - subtle plague

  24. #24
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    The old body was cut up to provide panels for reinforcement in the front fenders to improve rigidity in the areas that were massively cracked, and a windshield was installed to reduce drag.

    Click image for larger version. 

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    sigless.

  25. #25
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    Quote Originally Posted by basinbeater View Post
    ... a windshield was installed to reduce drag.
    be sure to let the Republicans know.
    Merde De Glace On the Freak When Ski
    >>>200 cm Black Bamboo Sidewalled DPS Lotus 120 : Best Skis Ever <<<

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