Calling Steve Zuckerman
 

Steve,

What is the distance between the notch at the rear of your transom, and the prop centerline. Or keel to prop centerline. I want to determine what my 08 is set at in comparrison to your boat. My boat is coming with an IMCO Extreme SC outdrive, with a standard length IMCO lower leg. lI will not recieve my boat untill around the 18th of this month, but when I do, I will post this measurement on line.

Thanks,

Chris

Hi Chris,
I have measured mine 2 ways. One is the actual X dimension, which is 19.25"s. That is driveshaft centerline vertically to the bottom of the pad.
The easy measurement for comparison to mine is from the box at the bottom of the gimble housing where the trim lines come out, to the top of the notch, measured along the transom. Mine measures 6 3/4"s there.
I'll take a look at the measurement you are asking about. It's my understanding that some of the late 07s and all of the 08s are now 18.25"s, which I would consider perfect. Better late than never. Even though we have figured it out , this is something the factory should have done themselves years ago with research and testing. To give you an idea how bad it used to be, my boat GPS'ed 76 MPH when I bought it. I think you'll see better quality and rigging standards from the new management.
I am running a standard length Imco case with XR gears, and a 1" spacer (so our drives are hydrodynamically the same), making mine an effective 18.25"s, and the boat handles very well in all aspects, holeshot, midrange efficiency (never worried much about that one in the past, but $4 a gallon gas :rolleyes:), high speed handling, and rough water.
I do think the P5-x is a big help too. As the XD goes up, you have less blade area in the water, and that extra blade really helps carry the boat, and lower the slip %.
Regards,
Steve

Steve,

Thankyou for the reply. I am looking forward to setting up my boat to run the most efficient possible within the first year while the motor is still in warantee. After that, I am planning on slowly doing mods to the motor untill it is "being all it can be" I would appreciate the prop depth mesurements relative to the notch or keel to determine prop depth of your boat. It is my understanding that you can change prop depth with different length lowers while keeping the measurements you mentioned the same. ie 18.25 or 19.25 inches from notch or keel, to driveline center, but changing the lower to suit prop depth.

I am also anxious to try a P5-X, as I have heard good things about it. Who do you have them tuned by?? It is my understanding that Throttle-Up is no longer working with Hydromotive.

Thanks again,
Chris

P.S. Sorry about the misspelling of your name in the heading on this post

Hi Chris,
You are correct. Not only is Throttle Up not selling Hydromotives any more, they aren't modifying anyone else's propellers. It's a shame because they did great work.
You can buy them directly from Hydromotive, and they have an exchange program, which will allow you to find the correct pitch. I am probably going to sell my 28" TU labbed P-5X, and run a 29", if anyone can use the 28".
They also do their own lab work, once you determine the correct pitch.
Regards,
Steve

Spoke with Julie yesterday (Very Nice to talk with) TH will be manufacturing something comparable to the P5-X in the near future. Possible by March. Might be worth the wait. It will be a CNC prop and a bit more expensive than the Hydromotive.

That's a safe bet.......somebody else will have to be the guinea pig on that one ;).
BTW, Hydromotive came out with a 4 blade version of the P5-X, called the Quad IV-X. Looks great and ran very well on a friend's twin engine Fountain with high XD. Maybe worth a try.
Precision Propellers (anyone remember the Turbo?) has come out with a new 5 blade. I will try to test both soon.
Regards,
Steve

Chris,
I just referenced another thread where Southocg and I were comparing XDs. If our cross references are correct, my propshaft (with a 1" spacer and standard length Imco case) is 4.5" below the pad. I haven't actually measured it, but that should be very close.
Regards,
Steve

Steve,

Thanks for the info.

I hopefully will be checking mine out by the middle of next week.

Chris

Steve, The QIV-X has been around for a few years. My buddy has one on his Rage. Just an FYI, it works OK but has quite a bit less bow lift than a Bravo even though more bow lift is it's intent.

Dave

I tried a QIV-X when I originally tested the P5X. It did not work at all on the Heat. Lost about 5 mph, not nearly enough bow lift.

Dave,
Thanks for the heads up. Since it's here in town on a friend's boat, I will still try it for comparison purposes.
I will probably end up with a 5 blade, as usual.
Regards,
Steve

Bob,
Ouch! Do you still have your 29" P5-X, or did it go with your Heat?
Regards,
Steve

It went with the Heat. Wish I had a pair of them for my 35. I think that would really improve cruise.

Question: How do you think boat weight plays a part in prop depth in relation to the water and prop slip?

ie. two Nordic Heat's with the same x-dimension. One weighs 10,000 lbs. the other weighs 100 lbs. The heavy boat would have the prop deeper in the water than the light boat. The light boat would now have a prop that was mostly in the air, making slip very high. The light boat would have less drag for sure because less boat was in the water, but the slip would be really high because the prop was so high.

I think that changing the prop depth with shorties or spacers has something to do with weight also.

Chris