Wireless cycle speedometer...can it be use on rc boat?

[Mel279]

hi guys

does anyone have any experience use this device to check the max speed on rc boat? LMK

http://cgi.ebay.com/ws/eBayISAPI.dll...m=350389969123
Mel

[siberianhusky]

Not worth the trouble, a magnet has to be stuck to some rotating part and a hall effect sensor is placed near it. thats the wireless part, it doesn't have a cable going up the forks to the bars where the readout is located.
The range is pretty short on those.
It would be a ball park guess even if you knew the rpm, you can use a guess for prop efficiency so it would be
rpm x pitch x % prop efficiency.
Tried it using the telemetry on my radio to measure rpm, came up with some interesting numbers!
GPS seems to be about the best way, I'd love to have one and an eagle tree data logger!

[DyrtyByrd]

i dont think it would work i have one on my bike and it uses a magnet on the spokes and a sensor on the forks every time the magnet passes the sensor it computes the mph

[DyrtyByrd]

exactly what he said we posted at the same time.lol

[dag-nabit]

+1 on what has already been said.

About the only place to mount the magnet would be on the collet, and the weight of the magnet would throw everything so far out of balance it would shake apart.

Also, I doubt these units would be sensitive enough to even read something turning 30,000 RPM +/-.

You can pick up a sport GPS or GPS data logger for around $50-$60 bucks if you shop around. The data logger has no display, so you have to download to your PC to view logs and graphs, but they are often a bit less expensive.

Kevin

[Mel279]

thanks guys for you help...appreciated, I guess I need to get to get the GPS instead, anyway how about this GPS http://cgi.ebay.com/Mini-Handheld-GP...item1e5e38caf8

[dag-nabit]

thanks guys for you help...appreciated, I guess I need to get to get the GPS instead, anyway how about this GPS http://cgi.ebay.com/Mini-Handheld-GP...item1e5e38caf8

No. I bought one of those and it arrived a couple days ago. I overlooked the fact it does not lock in max speed, only displays current speed.

I was thinking that it was cheap enough that if I had a wreck, and it got sent to Davey's locker, it wouldn't be a big loss. Also small and lightweight.

I did check it out against a couple of good quality GPS units, and it was pretty accurate up to about 100 kmh (60 mph) then it started to wander a bit.

It seems not too bad for the $27 I paid for it, but it is designed for hiking and cycling. I gave it the kid to play with.

One of these might work, cheap enough, but since it is a data logger you have to wait until you download data to your PC, or, use the bluetooth connection to a smartphone. But I have no experience with them, and have no idea how functional the bluetooth would be.

http://cgi.ebay.com/GBTGP-38KM-65CH-...item19be59d758

Kevin

[Mel279]

Kevin

thanks alot bro, I nearly bought it...it rather small that why Im interested in it. Haven't tried the data logger tried, will try find some info on how to use it.

[egneg]

Get the Garmen forerunner 101 or 201. You can configure them to read max speed, average speed, and elapsed time. Money well spent if you like to track this stuff. I have the 201.

[dag-nabit]

Kevin

thanks alot bro, I nearly bought it...it rather small that why Im interested in it. Haven't tried the data logger tried, will try find some info on how to use it.

I have a Qstarz sport GPS that has a data logger function in addition to the display. A data logger will work, just not as convenient.

When you download your data you will get a track (usually displayed on google earth) which you can move your cursor along to see time, date, speed, altitude, and co-ordinates every time it records.

Or you can graph speed. The graph is kind of nice in some ways.

Just not as convenient as popping of the hatch and checking out your max speed on the display.

Keep looking, maybe you will get lucky and find a good used one for cheap.

Kevin

[siberianhusky]

That data logger idea is really cool! I usually bring my laptop anyway so no big deal to plug that in.
I'd only use it for set up and when testing changes, could be the ticket, did a quick search and found one that floats and is waterproof, plus you could connect an external waterproof antennae if you wanted to. Uses sd cards or usb cable.
Lighter than a full gps as well!

[Mel279]

Actually Im thinking of getting a much lighter in weight and smaller in size gps so that I can fit in my boat comfortably without hassle.

[Igoreski]

Eagle tree !!!

Actually Im thinking of getting a much lighter in weight and smaller in size gps so that I can fit in my boat comfortably without hassle.

OSE has the Eagle tree data logger and the GPS attachment is tiny.All the parts are tiny,I have the data logger 2 brushless motor RPM sensors,3 temp sensors and the GPS unit.All of which you can fit in the palm of your hand and close it.It all fit and worked great in my EKOS last year and got wet many times.I use it in my helicopters,planes and Crawlers and trucks too.It will even tell you what altitude you are flying at.You can read it on your computer screen or buy the onboard module which reads out on a screen the size of a pack of gum.http://www.offshoreelectrics.com/pro...rod=etr-GPS-v4 this is GPS and this is readout.http://www.offshoreelectrics.com/pro...tr-power-panel This gear can be used to select the correct pitch and diam of props on boats and aircraft as well as gear ratios on land vehicles.

[siberianhusky]

I didn't know eagle tree had a gps unit, I wanted an eagle tree before for setup, now i really want one!
Thanks

[dag-nabit]

That data logger idea is really cool! I usually bring my laptop anyway so no big deal to plug that in.
I'd only use it for set up and when testing changes, could be the ticket, did a quick search and found one that floats and is waterproof, plus you could connect an external waterproof antennae if you wanted to. Uses sd cards or usb cable.
Lighter than a full gps as well!

That's cool, where did you find that one. I have seen weatherproof units, but not floaters.

Kevin