GPS system???

[RCnerd]

Hello Everyone,

I am looking to get a GPS system that I can use to put either in my Motley Crew or Revolt. I would like to measure the speeds to see if any of the improvements I am doing are actually working.

Do you guys have any recommended brands?

Thanks!

[electric]

foretrex 301. Runs on aaa batteries. Small and easy to velcro into your boat. You might find an older model foretrex 101 for less money used, I had one of those and it worked fine also.

[siberianhusky]

Eagletree data logger, Amps, volts, temps and gps. Everything you need to give you all of the real info about your changes.
GPS just tells you the speed, the ET tells you what is going on under the hood for better or worse!
I was amazed at what was really going on the first few times I used mine, now I don't make a change without hooking it up for at least a run.

[banixj]

garmin geko: so small, so cheaper, good accuracy... 2xAAA, waterproof.... about 35usd for an used one...

[lohring]

The difference between an Eagle Tree system and Garmin GPS units is the amount of information available. I would recommend a simple system that gives maximum speed only for beginners. The Eagle Tree is more complicated, but is wonderful when you are going into unexplored territory. I've been using both since 2003 when we were trying (successfully) to get the first gas boat SAW record over 100 mph. The same boat has held the GX1 SAW record of 109 mph since 2004. We converted to Eagle Tree units and never looked back. We ran two Eagle Tree units on our world record holding full size electric hydro. The new Castle ESC data loggers are almost as good, but are missing speed information.

Lohring Miller

[banixj]

Maybe Eagle Tree Systems are so good but it costs ten times more than a Garmin...

OT ON
can you give more info about full seiza electric hydro? For example if there's some boat like taht on the market... or how much it cost a prototype like that...
OT OFF

[Basstronics]

I had the eagle tree before. WHile its all good for mega serious people to know the volts/amps I found I want utilizing it. Also limited to 150A...

I just bought the Hobby King model of a "Voltron". It fits into my confined areas, doesnt add any real weight. Most importantly its real easy to use and gives the max speed, total distance run and the time it logged. This unit is powered off the radio system.

http://www.hobbyking.com/hobbyking/s...dProduct=23137

or

http://www.velocity-rc.com/cgi-bin/vrc/prod/manager.cgi?action=show&pid=59

[Johnnysplits]

Voltron GPS www.velocity-rc.com

[lohring]

Mike Bontoft's electric boat is not available commercially. The design and most of the electrical system was very conventional. The boat was a standard outboard hydroplane design with a 48 volt pump motor geared up to a conventional racing outboard lower unit. The Enerland lithium polymer batteries were the innovation. We used 252 cells packaged into six cell packs. Seven of these batteries were wired in parallel in a compartment. The six compartments were wired in series to give 133 volts nominal. Attached is data log of the record run. The current and voltage are for a single six cell battery. The current at the speed control is seven times higher and the voltage is six times higher. The rpm is propeller rpm. The motor was geared up so its rpm was that rpm divided by 1.75. We used a quick change gear box to match motor and propeller characteristics. To get an idea of the costs involved, the batteries cost around $14,000 at the time. The cost of two data loggers was trivial.

Lohring Miller

UIM record.JPG