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gcarter
11-04-2008, 05:41 PM
If ya got the pockets, it might be worth it;


http://compx.com/lmi_eblast/2008-10-31/images/lmi_logo.jpg (http://livorsi.com/)http://compx.com/lmi_eblast/2008-10-31/images/lmi2.gifhttp://compx.com/lmi_eblast/2008-10-31/images/image.jpg DataTach™ Prop Slip™ Now Available For Lease

Livorsi is now offering our one of a kind test kit for lease. Test drive our portable DataTach™ Prop Slip™ test kit and reap the benefits of this revolutionary instrument. Tweak the drive trim, prop size and gear ratio to reach maximum performance. But this tool isn’t just for high performance boats; use it on fishing boats, wake boats and cruisers to boost fuel efficiency and find the most efficient prop for your needs.
http://compx.com/lmi_eblast/2008-10-31/images/digital_gauge.jpg
This digital gauge displays: compass heading, single or dual tach readings, propeller slip, GPS speed with recall, and Record and Document. The DataTach™ Prop Slip™ has a computer that receives GPS speed and RPM info and calculates the slip of your boat's propeller 5 times per second. A lower prop slip % = better performance.
Take this portable test kit on test runs when preparing for a race or a poker run. The test kit provides quick and easy hook-up of the DataTach™ Prop Slip™ by packaging it in a convenient waterproof case. With built-in GPS and power supply you can take this kit anywhere, just add a tach signal. Give the DataTach™ some info on your boat like propeller pitch, gear ratio and tachometer pulses and you’re ready to go.
http://compx.com/lmi_eblast/2008-10-31/images/graph.jpg (http://propslip.com/demo/index.php)
The recording module can record up to 8 hours of testing time on one formatted memory card. That’s a whole day of boating! You can start and stop recording at anytime. To see a clear picture of your boats performance you can upload the saved information from your computer to propslip.com (http://www.propslip.com/). Simply take the memory card and insert it into your computer’s card reader. Then follow the step by step instructions on propslip.com (http://www.propslip.com/) to upload the information. You can even compare your boats performance to other boats that were tested.
The test kit includes: waterproof case, DataTach™ Prop Slip™ gauge, GPS antenna, memory card, USB reader, AC & DC adapter, harness to connect to tach signals and instruction booklet. The DataTach™ Prop Slip™ is also available as a 5" in-dash gauge (for purchase only).
Lease rates are shown below. A $1,500 deposit is required in order to lease the DataTach™ Prop Slip™ test kit. The deposit will be refunded upon return of the test kit. Lease Rates:
2 weeks — $249 + shipping
1 month — $449 + shipping

The Hedgehog
11-04-2008, 05:46 PM
I thought about buying one for mine. The price is not too bad. The problem is that for singles the upper section only reads on one half. I figured that it would look goofy.

Mr X
11-04-2008, 06:31 PM
I have one, it works GREAT!
If hooked to a single, ONLY one side comes on, so it does not look goofy.
(I thought the same thing till I got one and read the directions.)

SilverBack
11-04-2008, 07:20 PM
Mr. X..did you get some good information from your?? Do you have it on the 22C?

SilverBack
11-05-2008, 09:10 PM
Is there a difference between the test kit and the Data Tach complete kit? I talked to Jim at Top Notch Performance today and he has the complete kit for 9 hundred and some change.

mrfixxall
11-05-2008, 10:34 PM
i dont think it works as good as they say it does,how is it soppose to calculate prop slip? on our race car we use a data logger, theirs sensors every where...each tire has a sensor,the driveshaft has a sensor,transmission has a sensor,crankshaft has a sensor,each sylinder has a sensor etc etc etc.

then you plug it into your pc and it tells you after each run what the car is doing..it compares all the data after the run and tells you what the tires are doing compared to the driveshaft speed..

if theirs no sensor on the propshaft then it wont give a accurate reading..

just my o2.

Conquistador_del_mar
11-06-2008, 12:47 AM
i dont think it works as good as they say it does,how is it soppose to calculate prop slip? on our race car we use a data logger, theirs sensors every where...each tire has a sensor,the driveshaft has a sensor,transmission has a sensor,crankshaft has a sensor,each sylinder has a sensor etc etc etc.

then you plug it into your pc and it tells you after each run what the car is doing..it compares all the data after the run and tells you what the tires are doing compared to the driveshaft speed..

if theirs no sensor on the propshaft then it wont give a accurate reading..

just my o2.

Mike,
The unit takes the prop pitch and outdrive gear ratio into account so the theoretical speeds can be calculated by the unit with the RPMs fed to it - compared to the actual GPS readings the prop slip is calculated. You can click on the picture George provided to see the inputs to the mini computer. Make sense? Bill

zelatore
11-06-2008, 09:52 AM
on our race car we use a data logger, theirs sensors every where...each tire has a sensor,the driveshaft has a sensor,transmission has a sensor,crankshaft has a sensor,each sylinder has a sensor etc etc etc.
then you plug it into your pc and it tells you after each run what the car is doing..it compares all the data after the run and tells you what the tires are doing compared to the driveshaft speed..


Sooooo....what are you racing, and what data acquisition are you using?

I've seen some of the systems in action; they're pretty impressive. I know the basic gps based systems start at only a few hundred bucks, but you can actually start getting a decent piece for around $1000. Or you can get crazy and call the guys at Pi research and drop 100K or something.

mrfixxall
11-06-2008, 01:51 PM
Sooooo....what are you racing, and what data acquisition are you using?
I've seen some of the systems in action; they're pretty impressive. I know the basic gps based systems start at only a few hundred bucks, but you can actually start getting a decent piece for around $1000. Or you can get crazy and call the guys at Pi research and drop 100K or something.

We use to have the autometer version but we switched it to the msd racepak..

BigGrizzly
11-06-2008, 02:05 PM
Well my Lowrance GPS has the nema 2000 fuel hook up and with the dataa acquesion it is easy to calculate mpg and gph, which will give the accurate number because GPH and MPG relate to prop slip with tach data included. It cost me $50 to hook to the GPS I already had.

mrfixxall
11-06-2008, 03:54 PM
Mike,
The unit takes the prop pitch and outdrive gear ratio into account so the theoretical speeds can be calculated by the unit with the RPMs fed to it - compared to the actual GPS readings the prop slip is calculated. You can click on the picture George provided to see the inputs to the mini computer. Make sense? Bill

Bill, i understand that but i dont see how it can calculate the prop slip with out having some kind of a speed sensor that the prop is turning compared to mph or the crankshaft speed of the engine:wink:

BigGrizzly
11-06-2008, 05:13 PM
Since it has a GPS built in it is using the RPMs and actual prop speed Vs theoretical speed. This means it knows the theoretical speed Vs the acuial speed so it then calculates the prop slip that way.
Pitch X RPM
---------------- = Theoretical speed
drive ratio X 1056
Theoretical speed - actual speed
------------------------------------ = SLIP
Theoretical speed
This is just a computer with a built in GPS. The nice part with the tool, It calculates slip at different RPMs while underway. With my set up I can do it with fuel consumption at various RPMs, which bypasses a couple of steps for what I am looking for. We used the GPS and formulas when we tested at Honda Marine.