Nautique future developments?

[vision]

I think the next step in the next 3-5 yrs efficiency wise continues in the transmissions... The step forward Nautique took with the new trannys and the 17x17 props is HUGE. we saw the equivalent of an entire engine upgrade in performance going this route. This is a big deal, I dont think gets the recognition or folks understand how big of a deal it is. The key to efficiency is a big symetrical prop where PITCH = DIAMETER. thats where props are inherently most efficient. the further they get from YY x YY the more the become inefficient. so the best tq props we have right now for the 350, 409, 450s, is the 2315s, 15"x12"s.... that tells you we have a TON of ground to gain in efficiency of power transfer, reduce prop slip...allows folks to run smaller engines for the same performance and pay less for their boats, burn less fuel etc etc.

Does anyone have any real GPH figures for the new 2:1 transmission with the 17x17 prop in a 450? No question that gearing down the boat via the transmission will greatly improve hole shot. The question is whether the added efficiency of the prop ratio results in better GPH at tow speeds.

[kopp210]

Make it so you can stop a loaded G without a precisely timed turn, and not have a wave come over the back.


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[sodbuster88]

I think a few people are unaware of the obvious. It takes a lot of energy to make a big wake. To make a big wake, you have to displace a lot of water, you make a big hole in the water with the weight of the boat. That heavy, ballasted boat is now trying to climb up a 2 or 3 foot hill, in the lenght of the boat. Lets say two feet up in 25 feet. Same as going 8 feet up in 100 feet. That is an 8% grade. What kind of fuel economy would you expect from a truck hauling thousands of pounds up that steep of a hill? Never mind a wheel and tire on the ground transfers more energy to the motion of the vehicle, than a propeller, and it is easier to push something throught the air, than through water, at speed.

If you want fuel economy in a boat, you need a light boat. Running at planing speeds, not plowing through the water, at displacement speeds.

How 'bout a 3056 CAT marine diesel. 6.0L I-6 turbo with ATAAC that weighs 1350 lbs ( with gear box )and burns 7.5 g/h at peak power / torque (200 hp at 2400 rpm). Engine is 21.6 in wide, 31.0 in tall and 55.2 in long with a ZF Hurth HSW 630 A Gearbox attached. Also has a 400 hr engine oil interval.

[Zach@n3]

There we go.

[wakerider107]

How 'bout a 3056 CAT marine diesel. 6.0L I-6 turbo with ATAAC that weighs 1350 lbs ( with gear box )and burns 7.5 g/h at peak power / torque (200 hp at 2400 rpm). Engine is 21.6 in wide, 31.0 in tall and 55.2 in long with a ZF Hurth HSW 630 A Gearbox attached. Also has a 400 hr engine oil interval.

I'm all for this!

I've talked with Indmar and PCM, both say they are avoiding deisel because of prices at the pump (although PCM said they have something in the works to come out in a couple years, but it's secret apparently). I don't think the price of deisel should be of concern, since the price of premium/non ethanol is close, if not more than deisel.

[swc5150]

I totally agree on the diesel. Again, the Audi/VW diesel MC offered a few years back was awesome. The price of admission was the downfall, resulting in soft sales...which could be why Indmar is gun-shy about getting back into it?

My wife drives a TDI, and diesel is about the same price as premium/non-ethanol, but of course there's no comparison on fuel efficiency.

[jrz1]

How about an advanced ballast management system that has an auto-leveling feature both side to side and front to back which monitors the boat's position constantly while underway and self-levels to a preset position based on changing loads (ie people moving around etc.) to maintain a desired wake shape. I'm constantly fighting to get clean wake on one side or the other or both. There has to be a way to figure out what the front/back and side/side attiude needs to be to obtain various size and shape wakes. The current pre-sets are OK but by nature they are static settings to obtain a certain wake profile based on the weight of the boat at the time. Change the number of passengers, fuel etc., speed and those preset will likely still get you close but not precise. I'd like a system that gets you 95%+ of the way there all the time based on a given load/speed etc.

[Zach@n3]

JRZ, I have always thought a better means of ballast management would be weight pads under the ballast tanks(or bags) to get the most accurate reading of ballast vs the pumps just being timed. That could Segway into a way to use active ballast management.

[sodbuster88]

JRZ, I have always thought a better means of ballast management would be weight pads under the ballast tanks(or bags) to get the most accurate reading of ballast vs the pumps just being timed. That could Segway into a way to use active ballast management.

Also to JRZ's idea....There are component suppliers that make electronic levels / inclinometers that can be tied into a control system that could do this all automatically. Great idea.

[kopp210]

It would be sweet to have a large weight somewhere in the bilge that could shift issue to side to keep the boat balanced. If they can make an offshore boat not rock in the waves with a sea keeper, they could surely make a wakeboat always stay level. A linear actuator, level sensor and some basic controls.

It is a pain to always move people around and it seems like someone always ends up halfway between seats.


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[4th ski-doo]

I was following on another site a Duramax conversion into an X Star. The D-Max store was doing it. Looked great, saw video water tested then it disappeared. I had posted about surf exhaust because even the gas engine gets noxious at times. Surf pipe fixes that tho, I'll see if I can find a link later but I must say it looked and sounded to be extremely expensive and these boats are blood curdling cost already.


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[jrz1]

Yes, you would need accurate measurement for system to work. All tanks could be connected and water quickly shifted among them via electronically controlled valves to shift weight. Might not be instantaneous but better than what we have today. The rapid movement weight that kopp refers to wouldn't need to be large - just for quick fine tuning. Faster than moving water. Could probably be 20-30 lbs on some sort of screw drive. One front to back and one left to right. Key would be gathering data on exactly what boat position and weight produced what kind of wakes and then using that logic in the automatic system to acheive the desired wake profile.

[4th ski-doo]

Wouldn't the system get thrown off and over react when turning?

Here's a clip of the deezl X 80.

http://youtu.be/1JKkM_k6L2M


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[josemolino]

Wonderful idea and I am sure is technically & economically feasible nowadays. The nice thing is that the weight does not need to be so large (letīs say maximum the weight of one person)

It would be sweet to have a large weight somewhere in the bilge that could shift issue to side to keep the boat balanced. If they can make an offshore boat not rock in the waves with a sea keeper, they could surely make a wakeboat always stay level. A linear actuator, level sensor and some basic controls.

It is a pain to always move people around and it seems like someone always ends up halfway between seats.


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[Nordicron]

I think the auto weight thing is a good idea but is it really that hard to fine time your ballast? I mean isn't that weight a bag a lead floating around the cabin floor is for?
I like the idea of a diesel or a multi speed tranny to save on some fuel cost myself! Or what about a ballast system that is empty when u pull your rider up but back to full in 30secs! Imagine more fully loaded starts! That would save some tremendous amounts of fuel plus a lot of wear and tear on the boat!




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