what RPM gives you 36 MPH

[gtink]

Hi all,

I have:
-MC ProStar 205 1995
-LT-1 310 1:1 13X13 prop

Just Driver, and mirror with very little extra weight in the boat.

can anyone tell me their RPM for 36 MPH so I can confirm my speed is within 1 or 2 MPH.

Thanks,
Greg

[SkySkiSpokane]

Same boat here!

I can get it anywhere from 3200 to 3500. It depends on altitude and air temp. The best way is use a GPS. I have a handheld and I callibrate everytime I go somewhere new or the season change. (Can happen anytime here in the NW) :steering:

[gtink]

very good, for those in the south, I am at 1000 feet + or - 40' and avg temp is around 85 with 40% humidity.

By the way, what is a good GPS to start looking at? or should I just look at parfect pass?

[kpickett]

I've got a '94 190 with the LT-1. With the stock 13x13 OJ prop, I get 36mph at 3400 rpm.

[east tx skier]

93 205 w/ 351 HO and 13x12 Acme. 36 mph at 3,475 rpms.

[jamisonsbrodie]

Perfect pass is awesome and worth every penny, however unless you have slalom course with timing magnets, you still need a gps to calibrate it exactly. The paddle wheel that is used is not accurate above @ 30 MPH

[east tx skier]

Unfortunately, with 6.4 digital pro, recalibrating the digital speedo with GPS doesn't carry over to slalom mode. I think they changed that for 6.5.

[jamisonsbrodie]

I use the GPS to get my baseline RPM @ 34 and 36 MPH, then use rpm mode.

[EFiles]

very good, for those in the south, I am at 1000 feet + or - 40' and avg temp is around 85 with 40% humidity.

By the way, what is a good GPS to start looking at? or should I just look at parfect pass?

West Marine has a very good info section on GPS units in their catalog. I was looking for one a while back this was the best source of info I found.

[Hoosier Bob]

The only problem with watching RPM is it does not account for additional weight, drag (Bimini) and wind. Speed is speed. I pull into a slight breeze vs with the wind and I get a fairly big change in RPM but my speed is the same. RPM is great as long as your in a vacuum, ha ha. Use the GPS or time a course. I have a Garmin 60CS and it works great for the car, boat and motorcycles.

[SkySkiSpokane]

If you are considering GPS' then definately look at anything garmin. They have an 80 dollar etrex that will do everything that you need for calibrating speed. The magellans can be a little picky. I have an Etrex ledgend with the moving map. I love it for all my outdoor stuff. I think that they are in the $150-200 range now. Well worth every penny.

[east tx skier]

I use the GPS to get my baseline RPM @ 34 and 36 MPH, then use rpm mode.

I set my baselines in the course, check them with the gps, and run rpm mode when free skiing.

[east tx skier]

If you are considering GPS' then definately look at anything garmin. They have an 80 dollar etrex that will do everything that you need for calibrating speed. The magellans can be a little picky. I have an Etrex ledgend with the moving map. I love it for all my outdoor stuff. I think that they are in the $150-200 range now. Well worth every penny.

I agree with going garmin over Magellan. I had a Magellan for a couple of days and had serious issues even connecting with three satellites. I've had a street pilot colormap and an etrex and both have been trouble free (different uses obviously).

[gtink]

Thanks all, I will check into the Garmin model GPS's.

[SteveO]

You guys had me curious on the GPS, so a little e bay research revealed the following. I think I see a new toy on the wish list. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=34289&item=5786334288&rd=1

[Hoosier Bob]

Do a search for the Etrex Legend. I believe you can find the with the Street, Topo or Lakes and Waterways (?) CD for around $180-$200. The map cd is around $100 alone. I also belive Target had the package for very little. The legend alone goes now for around $150 and is a nice unit. If you want fun and color with a larger screen go to the 60C.You guys had me curious on the GPS, so a little e bay research revealed the following. I think I see a new toy on the wish list. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=34289&item=5786334288&rd=1