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
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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
paging zzz
he's a firefighter, which is, y'know, like a cop
.... right??
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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.
endlessseason has one
There are speedgun apps too, along with gps speedometers.
Just drive right next to whatever it is, it'll be fine.
https://www.pocketradar.com/?gclid=E...SAAEgJBNvD_BwE
I’ve got one of these. It may work for you depending on what you need.
^^^ 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. Attachment 481637
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.
It would be fun to try and will give us options on our testing.
I'll shoot you a pm.Attachment 481639
I'm offended.Quote:
Originally Posted by tgapp
Hey! haha. BB lemme make some calls.Quote:
Originally Posted by zion zig zag
Word.
^^^^^^^Quote:
Originally Posted by Buster Highmen
it's not like the guy has an annual speed trap thread or anything
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
As you should be.Quote:
Originally Posted by zion zig zag
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.
Download speedometer app. Tape it to car. It'll work.
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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.Quote:
Originally Posted by The Reverend Floater
Advanced speed detection technology has been procured.
We will use a GPS watch tightly strapped in as a secondary speed measurement device.
Subscribing to this thread.
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Fast forward a couple years.
https://youtu.be/5kMTHwjy6Z8
Quote:
Originally Posted by basinbeater
Measure twicet, cut oncet.
The science lesson perhaps is: FULL SEND.
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.
Attachment 481797Attachment 481798
be sure to let the Republicans know.Quote:
Originally Posted by basinbeater
That thing needs American flags stuck in the bed of itQuote:
Originally Posted by Buster Highmen
Top speed of 65mph. Little disappointed. I was hoping to get at least 70 mph.
As we cycled through pinion gears, we began to see a top speed level off in the 60s, but motor temps continued to climb. We were definitely hitting the range of diminishing returns.
Couple mechanical failures, pinion gears falling off, stripping set screws, dog bones popping out, but we were able to collect data for 11t, 13t, 14t, 15t, 17t, 18t, 19t pinons.
It was cold as balls.
The boy learned a lot, and he has a bunch of ideas on how to make the experiment better controlled, and has ideas on what we learned, and what other tests we could do to further improve the performance of the car.
That kid is going places.
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What about varying wheel diameter and tires? Get a shit set and fill 'em with expanding foam?Quote:
Originally Posted by basinbeater
This is rad. Congratulations on having a Motorhead in the making.
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Cool project. I'm late to the party but I use this for rc speed runs:
https://www.amazon.com/MEILAN-Comput...3&sr=8-26&th=1
What's the sample frequency on those things?Quote:
Originally Posted by Thaleia
Oh man I have zero clue about that lol.