Wake "spray": can I fix it?

[southkogs]

^^^^ What he said.

I can take the family out and do a little skiing or scuba diving. And with folks - and a dog - getting in and out of the boat for a few hours, I'll still only get maybe a cup of water out of the bilge when I pull the plug. Pump will never pull anything up at all.

Might be time to look for some water logged areas of the boat and see if anything is weighing you down in the stern.

 

[Texasmark]

Where do you set the outdrive trim when pulling water toys?

 

[mofirsttimer]

Where do you set the outdrive trim when pulling water toys?

Usually between 1/4 and 1/2 on the gauge. A higher trim reduces the spray. Last two weekend attempts to get out on the water have been foiled...next time I get out (hopefully this coming weekend) I'll get a video.

Thanks everyone for the thoughtful replies!

 

[Texasmark]

Okayeeeee. on the leading edge of the mid section and for most of the MS toward the rear is a horizontal plate, protruding out the front, about 2" above the anti-ventilation plate that is above the prop. The purpose of that plate is to keep water from running up the front of the MS and into the boat.

Going to assume I/O designers mount the LU such that the AV plate is about 1" below the extension of the bottom of the boat...put a yardstick on the bottom, extend it out past the outdrive and it would run between the AV plate and the plate mentioned above.

At low trim positions, low speeds,....stern down, wake rises fast as soon as the bottom passes a point, this plate is in the "slipstream" of new water hitting the outdrive. This contact area can cause the spray to which you refer. By your raising your trim position, the deflection angle changes, as does the amount of the plate hitting new water and the output changes, reducing the height (and probably the amount) of the deflection.

If it's not that, your hydraulic hoses to the trim cylinders are doing it, but my first guess is above.

 

[mofirsttimer]

Okay Texasmark it took me a long time since I haven't been on the lake much recently. Here are a couple of videos...

https://youtu.be/XyQD37bDNFQ

https://youtu.be/bE0GlixOn4c (view looking down at prop, slow motion)

Assuming it is the hydraulic lines going to my trim rams, is there anything I can do about it?

 

[Old Ironmaker]

I had a large high spray until I put a rubber insert in my Hummingbird transducer.

 

[Baylinerchuck]

I feel like that outdrive is sitting way low in the water. Definitely interested in what the others think. op2:

 

[Texasmark]

Get your camera out and put the outdrive in your ¼ to ½ trim positions you mentioned. Take a yardstick, or some other "straightedge" and put it vertical against the hull right in front of the AV plate. From a height of about a foot, considering the boat is sitting on the trailer and from an angle of 45 degrees, snap a picture from a distance of 5-6'.

Next, from the same height, about the same distance, move your aim over to the corner of the transom where the "chine" is located. Point here is I want to see if the "reverse chine" that seems to be running along most of the hull continues all the way through the transom, or if it stops maybe a foot or so prior to reaching the transom. In short, my thoughts are that if the reversing of the chine ceases prior to the transom, the water that was being contained by/trapped by the chine is allowed to exit and in doing so makes for your rooster.

I got 2 impressions from your video: First video confirmed my original assumption, being the AV plate is "dragging". Second video led me to believe it was reverse chine/absence of generating the tail.

When making the yardstick measurement, keep in mine that the boat is canted up about 8* (best I can measure with a protractor in the video) causing your AV plate to dip below the straight line measurement you will make. Since the water exits straight out (initially) from the lowest part of whatever is displacing the water, that is allowing for it to dip that much deeper.

Also, that 8* can aid the chine volume if the RC stops prior to the transom.....my current boat is a Crestliner Alum. and having the reverse chine it runs all the way and includes the transom. As a result it generates no rooster tail. Some Tri-hull designs of the past had what I am talking about where they stop the "sponson" water entrapment early and let it out prior to the transom, similar to what I think I see in the 2nd video.