Trim tabs on a jet?

[mevale]

I have a 21' day cruiser whit a Berkeley jet, droop and place diverter that I just recently installed. Would it be enough to get the boat less wet? Would installing trim tabs help a little more on rough water? Most of my boating is done at Lake Havasu.
Thanks
Joe
Ps IÂ’m running a Ford 467 whit a 8-71 Blower.

[Squirtin Thunder]

Joey,
I really don't think you will need them with your boat it is heavy and the short bow will aid in the rough water. Plus now with the droop you will have much more leverage to hold the bow down in rough water. If that isn't enough next season we can remove the intake and have a shoe and ride plate added or you can go with Duanes add-on deal.
Jim
Duane HTP
This is the perfect place for the Add On Shoe and Ride Plate Kit that we produce, (Hi-Tech). You can purchase them from most any reputable dealer today, $225.00. This is basically what they were designed for. They are not a better way to go than to redo your boat bottom and have the intake itself shoed, ($800.00 to $1500.00), but they are a great inexpensive way to add a ride plate to a boat that needs one, such as the situation in this thread that Moneysucker is asking about.
This kit fits the JG & JC pumps.
http://www.hi-techperformance.com/images/C_G_Shoe_Kit_293.jpg
This Kit Fits the JE & JF Pumps
http://www.hi-techperformance.com/images/3e-sho~1.jpg
__________________

[mevale]

Jim
I hope I understand this right a shoe and right plate does the same as trim tabs?

[Squirtin Thunder]

Yes and No !!!

[mevale]

Well letÂ’s start whit what does shoe and ride plate do?
I think I know what trim tabs do (rise and lower the bow) right?
Thanks for info.
Joe

[Squirtin Thunder]

A ride plate will do the same things as a cav plate. A shoe will reach down and grab more water. It will also pull or hold the rear of the boat in the water, tappered shoe. You can also stuf the nose or raise the transom with a back cut shoe. The Ride plate does the same exact things as cav plates.
Give me a call
Jim

[mevale]

So does any body have any experience whit trim tabs on a jet?

[bottom feeder]

Mevale,
On your heavy hull I belive a trim tab will only create transom lift. (Push the bow down)
When the plate is down it lengthens your running surface and the pressure of the water aginst it applies the force for transom lift. The length gives the tabs leverage. This leverage has the same result as moving the cg forward it will take more power to carry the nose.
A shoe is installed to load more water into the suction housing or provide some degree of transom lift.
The ride plate is installed for a multitude of reasons. Help with porpose, act as a sort of wheelie bar lets the hull rock back and take a set. or replace the void of the water which has taken a path through the pump.
The diverter allows you to adjust the thrust line to some degree. you can push the transom down resulting in some bow rise or apply some transom lift and let the bow fall.
I am sure some will have better description.

[spectras only]

mevale, I added tabs on my 21 Spectra jet ,to help running in
the ocean avoiding using kidney belts :rollside: .Tabs won't
give you bowlift . A hydraulic place diverter is a better
choice :cool: . I have hydraulic place on a 19' spectra and
it's like a champ even in rough conditions on the lake.

[mevale]

Mevale,
On your heavy hull I belive a trim tab will only create transom lift. (Push the bow down)
When the plate is down it lengthens your running surface and the pressure of the water aginst it applies the force for transom lift. The length gives the tabs leverage. This leverage has the same result as moving the cg forward it will take more power to carry the nose.
A shoe is installed to load more water into the suction housing or provide some degree of transom lift.
The ride plate is installed for a multitude of reasons. Help with porpose, act as a sort of wheelie bar lets the hull rock back and take a set. or replace the void of the water which has taken a path through the pump.
The diverter allows you to adjust the thrust line to some degree. you can push the transom down resulting in some bow rise or apply some transom lift and let the bow fall.
I am sure some will have better description.
Thanks for the info. That paints a better picture for me.
Joe

[Squirtin Thunder]

I didn't know I had to paint for you too !!!
Jim
Call me !!!

[jim@pj]

Mevale,
On your heavy hull I belive a trim tab will only create transom lift. (Push the bow down)
When the plate is down it lengthens your running surface and the pressure of the water aginst it applies the force for transom lift. The length gives the tabs leverage. This leverage has the same result as moving the cg forward it will take more power to carry the nose.
A shoe is installed to load more water into the suction housing or provide some degree of transom lift.
The ride plate is installed for a multitude of reasons. Help with porpose, act as a sort of wheelie bar lets the hull rock back and take a set. or replace the void of the water which has taken a path through the pump.
The diverter allows you to adjust the thrust line to some degree. you can push the transom down resulting in some bow rise or apply some transom lift and let the bow fall.
I am sure some will have better description.
Bottom Feeder, Good answer, you hit the nail on the head. Jim

[bottom feeder]

Luck I will take it thank you :D

[mevale]

I didn't know I had to paint for you too !!!
Jim
Call me !!!
DonÂ’t be a hater :D

[Danhercules]

So does any body have any experience whit trim tabs on a jet?
Look for Nucking Futs. He has em on his 20'er. Her uses them for porpusing and for runnin hard in chop. Send him a PM

[PLACECRAFT20]

I run a set of fixed tabs on my 20' Placecraft to get rid of the wide open porpus. Before I installed them, I tryed to adjust everything but the shoe. The tabs fixed the problem. I would show the picture but the damn image center wont let me download. (Whats Up with that)

[mevale]

I run a set of fixed tabs on my 20' Placecraft to get rid of the wide open porpus. Before I installed them, I tryed to adjust everything but the shoe. The tabs fixed the problem. I would show the picture but the damn image center wont let me download. (Whats Up with that)
This where I been going the last few days to up-load pictureshttp://www.hotboatpics.com/pics/index.php
Hear is picture of transom and set up.http://www.hotboatpics.com/pics/data/500/5504p-d-med.jpg

[Squirtin Thunder]

This wear I been going the last few days to up-load pictureshttp://www.hotboatpics.com/pics/index.php
Hear is picture of transom and set up.http://www.hotboatpics.com/pics/data/500/5504p-d-med.jpg
Joey,
That sure looks good from the back !!! Real nice pump !!!
Jim

[mevale]

Joey,
That sure looks good from the back !!! Real nice pump !!!
Jim
Thanks :cool:

[Squirtin Thunder]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=4530664763&sspagename=ADME%3AB%3ASS%3AUS%3A1
Check this out Joey. It will give you an idea of what you could do !!
Jim

[mevale]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=4530664763&sspagename=ADME%3AB%3ASS%3AUS%3A1
Check this out Joey. It will give you an idea of what you could do !!
Jim
Wow, I was thinking more like the Bennett trim tabs like this
http://www.westmarine.com/images/full/06829_f.jpg

[Squirtin Thunder]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=4530664763&sspagename=ADME%3AB%3ASS%3AUS%3A1
Check this out Joey. It will give you an idea of what you could do !!
Jim
The side plates would be called cavatation plates and the center is the ride plate. I know they would work great but there is a trick to getting them to work perfectly. In some old school circle boats they used them and it actually helped the boat turn. I still think that you will be fine without them at this point. For a next step Ride Plate and Shoe, just keep that in mind.
Jim

[AZKC]

Lenco trim tabs. No oil pump or lines ;)
http://www.fishing-catalog.com/lenco/planers.jpg

[Mohavekid]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=4530664763&sspagename=ADME%3AB%3ASS%3AUS%3A1
Check this out Joey. It will give you an idea of what you could do !!
Jim
Damn.
Somebody spent some serious $$$ and time to set those up on that boat. Too bad it's in such rough shape now.
Those would be cool on my cruiser. It might be worth a few bucks to make a bid. :idea:

[Squirtin Thunder]

Damn.
Somebody spent some serious $$$ and time to set those up on that boat. Too bad it's in such rough shape now.
Those would be cool on my cruiser. It might be worth a few bucks to make a bid. :idea:
Thats what I was thinking !!!
The do the on the Marathon boats and the GN and SS Boats too !!!

[Mohavekid]

ST, does your Super Jet porpoise at mid range speeds?
My Mini Cruiser has a nasty porpoise at mid range speeds unless I keep the PD trimmed all the way down. Top speed is smooth and steady.
I suspect my issue is the raised intake of the E pump and the altered Center of Gravity due to the E pump. I'm gonna try one of Duane's add on shoe kits for the E pump to see if that has any effect.

[Squirtin Thunder]

ST, does your Super Jet porpoise at mid range speeds?
My Mini Cruiser has a nasty porpoise at mid range speeds unless I keep the PD trimmed all the way down. Top speed is smooth and steady.
I suspect my issue is the raised intake of the E pump and the altered Center of Gravity due to the E pump. I'm gonna try one of Duane's add on shoe kits for the E pump to see if that has any effect.
I have no idea how the Super Jet rides. But the Sprint Jet rides excelant except when you are off the throttle a little. But then just put the diverter down a notch.

[mevale]

ST, does your Super Jet porpoise at mid range speeds?
My Mini Cruiser has a nasty porpoise at mid range speeds unless I keep the PD trimmed all the way down. Top speed is smooth and steady.
I suspect my issue is the raised intake of the E pump and the altered Center of Gravity due to the E pump. I'm gonna try one of Duane's add on shoe kits for the E pump to see if that has any effect.
What is porpoise? What does it feel like?

[Squirtin Thunder]

What is porpoise? What does it feel like?
It is a Mamale fish that jumps in and out of the water !!!
http://www.robynkye.com/photogallery/CoffsHarbour/04950007.JPG
http://www.robynkye.com/photogallery/CoffsHarbour/04950008.JPG
http://www.johndyeart.com/images/Spotted%20Porpise.jpg

[mevale]

You are such a smart a$$ but thatÂ’s the way I read it. Now really let me what is it?

[Squirtin Thunder]

You are such a smart a$$ but thatÂ’s the way I read it. Now really let me what is it?
Just call me

[Code Blue Racing]

When the bow of the boat is bouncing up and down in a steady rytham !!!

[Mohavekid]

Porpoising as it refers to a planing type boat hull is the rythmic cycling up and down of the bow as the boat moves through the water.
It is caused by an imbalance in the lift generated by the hull, the center of gravity in the boat and the thrust being applied to drive the boat forward.
It can be eliminated by adding lift to the transom thus forcing the bow down via trim tabs, ride plate or cavitation plate, or by changing the thrust centerline causing bow lift via a place diverter, droop snoot, or nozzle wedges.

[mevale]

Porpoising as it refers to a planing type boat hull is the rythmic cycling up and down of the bow as the boat moves through the water.
It is caused by an imbalance in the lift generated by the hull, the center of gravity in the boat and the thrust being applied to drive the boat forward.
It can be eliminated by adding lift to the transom thus forcing the bow down via trim tabs, ride plate or cavitation plate, or by changing the thrust centerline causing bow lift via a place diverter, droop snoot, or nozzle wedges.
Thanks, IÂ’ll have to put more attention when out testing the boat this coming month.
Joe

[Squirtin Thunder]

Porpoising as it refers to a planing type boat hull is the rythmic cycling up and down of the bow as the boat moves through the water.
It is caused by an imbalance in the lift generated by the hull, the center of gravity in the boat and the thrust being applied to drive the boat forward.
It can be eliminated by adding lift to the transom thus forcing the bow down via trim tabs, ride plate or cavitation plate, or by changing the thrust centerline causing bow lift via a place diverter, droop snoot, or nozzle wedges.
Dam good answer !!!!