Seaducer SD3 33"

Is it unusual to have to run positive strut angle on the sd3 33"?

I've been chasing an issue with mine getting hot and falling off pipe. While testing today the water roughed up a fair amount with some breeze and the boat was still glued to the water and fell off pipe, so I tried adding a bit of positive and "Bingo!" With the positive the boat wasn't running as wet and showed no signs of being too loose or dunking, even in the chop. As a bonus the motor ran cooler and ran for a whole tank without sagging or falling off pipe.

Now for the next question - is this posssibly a band-aid solution for something else? I did buy the hull used - maybe the hook in the hull is wrong?

Tim

Yeah i have some positive strut angle in my 33inch seaducer. It sits on the water at about 50% hull length when out on the course by its self. When there is a few other boats out there it sits nice on that sweat spot. I have never had an issues with it flipping or dunking.

Craig Knight helped me really get it on pipe back in 2007 at World Club Challange and he said it was sitting nicely. Only issue i have had with it was hooking in turns as the boat was second hand and the rudder was to short. I have since put on a new speedmaster rudder and it was fantastic. That was when i had a Mac21 in it.

Tested on props like

1742 - with TP21 pipe

x440/3

Chopper

I have a Nova Rossi goin in it over the school holidays and will be testing again those same props. Might also have to start messing with the strut angles if there is a massive difference in speed from the Mac to the Nova.

If the boat was not packed i would get you some measurements. I will let you know when it comes out of the trailor and tested with the nova where things end up.

Regards

Dave

If you can, try to contact Jerry Crowther at Seaducer boats, do EXACTLY as he says, and all will be good..i did along time ago and im very happy with my SD-3..he will probably also tell you not to even touch the hook that is in the boat...its there for a reason!

jerry will tell you to follow the hook in the bottom to the strut, the strut will have a slight bit of negative to it and make your adjustments very small, it is easy to overadjust on this hull

The ability to make accurate micro adjustments in the strut hight and angle is golden B)

Its a very fine line that changes with each hull.

Somewhere out there , there is a VERY trick strut adjustment setup that can do exactly what Im pretty sure your capable of utilizing Tim. B)

For the life of me I cant remember where I saw it........

Andy

I completly agree with John. Strut slightly down or level. These things are dogs when alone in calm water, but get them in some race water and they come alive! If you need to run positive angle then maybe you cg is too far forward? Or maybe someone messed with the hook? Also look into the chopper prop.

Andrew Grenier.

Thanks for the replies guys.

When I first got this boat I downloaded the instructions from the seaducer website and set the strut accordingly. I also confirmed the motor placement and rudder position and length. It would run fast for two to four laps, then everything would heat up and it would fall off pipe. I tried 2 different engines (both of which run very strong in my rigger), 4 different pipes at various lengths, 2 different carbs, A ton of props including "the chopper". I changed the fuel tank + lines and even the throttle servo. All with no improvement. It did the same thing in race water or even if I was out circulating with Gas mono's or on a wind affected course.

As soon as I tried a small amount of positive (and I'm talking tiny - less than a degree diffenece to the bottom of the hull) I saw instant results. Engine temps dropped significantly and needle setting stayed consistent. I'd already tried various heights on the strut at zero. So I'm confident the adding positive wasn't just raising the strut inadvertently. I have both degree wedges and an angle finder at my disposal thankfully. Also, when I tried it with the small amount of positive it was in choppy water - worse than normal race water - and the boat never even looked like doing anything dumb.

The gelcoat on the bottom looks original, but being a molded boat I guess it could have warped or sagged slightly if not supported properly or left in a hot trailer etc?

Can someone give an approximate static balance measurement for an SD3 33"? I haven't played with mono's for a long, long time and this thing has tested me somewhat!!!!!!! Instructions and comments on IW all suggested it should run with a tiny amount of negative and as low as it will go, but I just can't get it to work like that.

Tim

Tim

Got mine out of the packed trailer just to see for you.

I have got only fly-**** amount of positive in the strut. Put a ruller on the keel and you can only just pick it by eye.

I can put a ruller over the bottom of it for you and give you some measurements.

I have taken some of the hook out of my 33inch electric one. Anyone that has seen its knows it was a crazy boat in the turns until i did that. Its is now a weapon ask anyone that has seen it run.

Any how, will do a hull map for you before the weekend. If i dont it will be over weekend when i get boat out after traveling. PM me your email address and i will send it there.

dave

I bet the reason your boat is running wet is the strut is mounted to low in the transom. With the strut brackets to low they drag in the water and push the bow down. Here is a picture of a boat that had the same problem. The guy worked on the boat for a few months and then called me asking about sanding the bottom. . I told him what was wrong he did and now the boat runs perfect. Here is a pic.

Jerry

Jerry ,

are you telling me those big strutt mounts couse drag running on full speed passes ? the part that you collored black will give lift and put the bow down ? that part of mount is still in the water than during the full throttle passes ? WOW .... i would never thought of that ..!

Jeroen

Thanks Jerry,

I would never have thought of that as being the cause. I'll have a look at that when I get home.

Tim.

The water coming off the bottom of the boat will roll up and the water spray will hit the brackets and push the bow down. All it takes is 1 drop of water to hit the square bracket to rebound down pushing the back of the boat up.

Jerry

Jerry_Crowther said:

The water coming off the bottom of the boat will roll up and the water spray will hit the brackets and push the bow down. All it takes is 1 drop of water to hit the square bracket to rebound down pushing the back of the boat up.

Jerry

Click to expand...

hi jerry kevin here from aust i am running a 44" boat when i first put the boat in the water it ran great,with the strut running parrell to the bottom,now i have to give it a lot negative angle to get the boat to release from the water it seems that the hook has changed do you have any idea how much hook is need to keep the boat on the water or the opposite to make it ride right??? i know its a hard question it seems that i will have to fill part of the hook in and than just sand it to get it right.

thanks kevin.

pumpin said:

Jerry_Crowther said:

The water coming off the bottom of the boat will roll up and the water spray will hit the brackets and push the bow down. All it takes is 1 drop of water to hit the square bracket to rebound down pushing the back of the boat up.

Jerry

Click to expand...

hi jerry kevin here from aust i am running a 44" boat when i first put the boat in the water it ran great,with the strut running parrell to the bottom,now i have to give it a lot negative angle to get the boat to release from the water it seems that the hook has changed do you have any idea how much hook is need to keep the boat on the water or the opposite to make it ride right??? i know its a hard question it seems that i will have to fill part of the hook in and than just sand it to get it right.

thanks kevin.

Click to expand...

Kevin

If you put negative in the strut that will push the nose deeper in the water. (Run wetter) you should have the strut straight and if the boat runs tight raise the strut a little it if runs loose lower is a little. But if the boat was running good. I would check the prop to make sure one of the blades did not bend causeing it to lift the stern of the boat. Let me know how it goes.

If you still have a problem we can check the bottom of the boat. But I do not think that is the problem.

Jerry