why is my cat doing this????
 

i have tried everything and my cat is still hopping unless im in 2'+ chop.

any ideas?

put some weight in the front,

try 2 60# sand bags from home depot

Props turning inward or out, my boat did the same turning in switched to outwaed and it went away. Just a thought!

ive tried inwards and outwards no change.

weight in the from makes it worse i think its too much transom lift .

what prop dia for ssm #4 are working the best and X dimension ?

Which props areu running?

Good tune but I'd rather hear the engines......

Tell us more about your setup...

Engines?

How far forward are they?

Drives?

Extension boxes?

Prop center line height?

Props?

Did you gut the cabin out?

4.25" Above
17" Dia Props
#4's On Boxes
Drives Are 56" Apart.

This Is A Drawing To Scale From The Rear. Looks To Me Like I Would Get More Water On The Inside Of The Tunnel And More Bow Lift With The Props Turning Out.

1 inch spacers ..or more power so you go fatser should solve the porposing !

I'm 2.75 above the bottom. 17.5 dia. props....I'm going to try turning out... Why you ask? Because looking for better handling and I've never tried it.

Tseph has a similar setup to you and I....I'm waiting to see how his runs

How far apart are your drives? Are your motors on the transom or forward like mine. Where do you get a porpus? Do you know your weight?

I'm rumming 35 props

Is this boat new to you? new setup, motors, drives, etc...

What did the previous owner try?

What kind of power, and speed are you seeing?

Have you had a cat before?

What speed are you running when the hop happens? 4.25 above is VERY high imo. I agree with bobkats, we need more information. Do you have boxes? At 4+ above you better or I doubt you get on plane. Do me the video looks like it cant carry the bow. We need to know speed and setup. Post some pics.

Looks like the old Linder hop to me.

definitely the Linder hop.... 4.25 above the bottom is crazy high..

Brian, I think this is the boat.

http://www.offshoreonly.com/forums/c...-cat-info.html

It looks like he's swinging a 3 blade. That might be the problem. A four or five blade surface prop might allow more bow lift. Correct me if I'm wrong

Looks like you have a 31 foot boat and need to get it to quit porposing at speed. I looked at your video and would offer a few sugestions. If you have tryed all the quick and easy solutions, then its time to step up and buy the extention boxes. You should work on the X dimention and consider 5 blade props. Gonna cost but you will get more speed and more stability in the end. This worked for me- James

Tunnel tab?

i have tried a tab it didnt work. i am testing with the drives 2.25" above sunday. we will see how it goes. considering reducing prop size but 1/2"-1" to reduce transom lift but i dont want to increase slip.

What props are you running, 3,4,5 blades? Is your setup the one in the picture above SSM on boxes?

Besides the X being too high, most of your "issues" are with the prop. Do yourself a big big favor, call Brett and get dialed in.
http://www.bblades.com/

It seems all the renditions or copys of the shadow and chris cats have a porpoise can they really ever be eliminated? or is it just lessened?

Brian have you had yours out yet? How does it handle/run?

Randy

Outlaw 1,
Here's a thread w/similar issue ...
http://www.offshoreonly.com/forums/c...chris-cat.html

Randy, See Phil's post #15. Question for Outlaw: Did you purchase this boat from Cody White? Previous posts give the appearance of prop swapping with other boaters. My second (and last) piece of advice. Contact a prop professional. Brett at BBlades is one. Get a handle on a good baseline. THEN fine tune with others on this forum.

Now Randy, get back to your asparagus.

I'm almost 100% sure that is the same boat. Look at the hatch in the video and the pic's in the link I posted.

Richard, are you going to boating this summer?

;)

Si'

Phil, Trying like crazy to. Blocks in the machine shop getting a final exam. Cranks getting balanced. All motor components are in my hands and ready for assembly once the blocks are back. Only parts missing are the prop shafts for the new shorties. What is the est. spalsh date for your ride?

Outlaw1, Please do post what Brett's advice is for your prop and outdrive specs.

I will save you some hassle and sell you my motors. 700 hp, 113mph every day in a 31 AO with 2 inch shorty bravo's.

I Ran The Boat Sunday With No Porpus But It Was 2'-3' Waves Chop. Pretty Nasty Water. Ran 114 At About 5100 Rpm. I Still Want To Try It On Smoother Water Before I Know If Its Fixed.

2.5" Above
4 Blades Turning In

What pitch props and what gear ratio? then we can figure slip and see where your at efficiency wise. 2.5 above is where I just set my AO at over the winter as a conversion from bravos to SSM's on boxes.

Have you had it out yet? How did she go?

Nope, complete change of plans... Just sold my motors yesterday to do a small upgrade. :party-smiley-004:

Hmmmmm a small upgrade???

Rumor has it that he is talking to Bob Teague.
http://teaguecustommarine.com//store...oducts_id=2170

Ah-boo boo boo booo
 

Pretty sure he is doing a rain dance:evilb: That AO owes me one and I think its coming this summer!!!

I just want to go boating.... One motor in, second one ready to drop in.

Where are the pics... I heard he's putting 420hp 454's in there that have a killer RV cam!

Wow this thread is way off track!

Outlaw1 hows the boat running?