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Author Topic:   Planing Depth
jshell posted 05-24-2004 01:11 PM ET (US)   Profile for jshell   Send Email to jshell  
I have been searching the site for the actual depth needed to plane a 2001 130 SPORT. There are many discussions and opinions about how far the motor drops down, but not really any consistent conclusions. Do any of you know the actual depth needed? My in-laws' place has about 18-24 inches of water at the end of their wharf. It gradually slopes down and drops off to about 4-5 feet deep at 100 yards out.

I would like to be able to pull a bigger person up on slalom with them standing on their trailing foot in 2 feet of water. When the boat starts the person steps right on the top of the water (We use to do this off of sand bars when we were younger). If I could start off in 2-feet +/- of water, I could get them up with no problem...I hope.

My Whaler is straight from the factory with no added weight and the 40 Merc.

Thanks in advance for your input.

Jeb

prm1177 posted 05-26-2004 03:04 PM ET (US)     Profile for prm1177  Send Email to prm1177     
Interesting question. While the 130's draft is 7 inches (add, say, another 6 for the engine), I wonder if the various stages a hull goes through before planing actually draw more water? Does the stern plow deeper as it picks up speed? Two feet only gives you a 7-inch margin of error.
Jarhead posted 05-26-2004 03:38 PM ET (US)     Profile for Jarhead  Send Email to Jarhead     
I don't try it in less that 3 feet with my 2003 130 Sport with 25-HP four-stroke.

Of course there's only one sure way to find out just how much water your set up needs. ;)

jimh posted 05-27-2004 12:02 AM ET (US)     Profile for jimh  Send Email to jimh     
Almost all boats squat down by the stern when accelerating from a stop, and I would expect the 130 SPORT will do the same. This would be the limiting depth, not the draft when on hydroplane.
jshell posted 05-27-2004 09:57 AM ET (US)     Profile for jshell  Send Email to jshell     
Good point Jim. I guess I should have named the thread hole-shot depth.

I have seen your calculations on how to determine the depth needed to launch a boat (Boat length/height, trailer length/height, slope of launch). Is there a calculation to determine the amount of "squatting" a boat has during the hole-shot? There are an enormous amount of factors that would play into this; Boat specs, weight distribution, motor hp, rate of acceleration, head wind/current. There might be too many factors to have an accurate formula. It still would be interesting to know.

It might be simpler to get in 4' of water, sit back ten feet with a snorkel, mask and a yard stick and see what happens! The water down at Perdido is trying real hard to get to 80 degrees. This experiment will have to be my first plunge of the summer. I will try it this weekend and let ya'll know.

Jeb


Aucilla posted 06-15-2004 09:58 PM ET (US)     Profile for Aucilla  Send Email to Aucilla     
Once up on a plane, I can sail wide open over 18 inches of water in my 2001 with a 30 hp 4 stroke. I am on my third aluminum prop though. Hitting rocks. I am now going to get a stainless steel one, risking lower unit damage.

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