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-   -   why is my cat doing this???? (https://www.offshoreonly.com/forums/awesome/253057-why-my-cat-doing.html)

outlaw1 08-10-2011 11:44 PM

are you running boxes and what hp are your motors putting out? im just comparing to mine because you are really flying.

outlaw1 08-21-2011 08:20 PM

112 mph 5250 rpm with a little positive trim and 200 lbs in the rear fixed the porpus. so the motors are going back.

ROTAX454 08-22-2011 09:00 PM


Originally Posted by outlaw1 (Post 3484882)
112 mph 5250 rpm with a little positive trim and 200 lbs in the rear fixed the porpus. so the motors are going back.

Sweeeet. Read thru this thread and don't see your motor numbers. What HP and torque at peak rpms?

feline frenzy 08-24-2011 09:23 AM

one day i will fly!!!! lol,

tssteph 08-24-2011 09:33 AM

I just want to go boating.....

outlaw1 08-24-2011 08:23 PM

i want to hit 125mph

because the weight in the rear helped im going to move my motors back 12" and i think i can lower them about 6" to lower my center of gravity.

any opions

tssteph 08-25-2011 06:49 AM

I owuld think that lowing them 6 inches would really throw off the driveline angle. I would run the boat some more and make sure the weight is what caused the poitive result in the porpoise. For mine water conditions pay a huge factor. Flat water porpoise is very noticable for about a 15 mph range 75-90 maybe. Rough water very little porpoise and its for a small mph range.

phil_p999 08-25-2011 10:34 AM

Brian, how is the cabin of your boat designed?
is it have the storage on the one side with the bed running side to side?

The reason I ask is im having a huge problem with weight in the front end. I am breaking props left and right. I am on my third set this summer.

I think porpoise is causing this along with too much weight in the front?

any advice would be great! :readinghelp:

on another note I put my boat along side my buddies 31 awesome 2001 and his sits 6" higher in the front end???

tssteph 08-25-2011 01:28 PM


Originally Posted by phil_p999 (Post 3488406)
Brian, how is the cabin of your boat designed?
is it have the storage on the one side with the bed running side to side?

Yes this is how mine is set up.

The reason I ask is im having a huge problem with weight in the front end. I am breaking props left and right. I am on my third set this summer.

Are you cracking the ears on the props?

I think porpoise is causing this along with too much weight in the front?

any advice would be great! :readinghelp:

on another note I put my boat along side my buddies 31 awesome 2001 and his sits 6" higher in the front end???

See answers above.


Going to the the speedmaster on boxes with transmissions and the bigger motors/blowers dropped the back end of my boat about 1.5 inches based oin picures. This 1.5 in the read results in about 3 up in the front. This is all compared to bravos on the transom.

outlaw1 08-25-2011 08:40 PM


Originally Posted by tssteph (Post 3488251)
I owuld think that lowing them 6 inches would really throw off the driveline angle. I would run the boat some more and make sure the weight is what caused the poitive result in the porpoise. For mine water conditions pay a huge factor. Flat water porpoise is very noticable for about a 15 mph range 75-90 maybe. Rough water very little porpoise and its for a small mph range.

my drive line is sloping down now the trans sits about 3" above the shaft in the extension box so the driveline angle isnt a problem. its really tight for the oil pan and the water pump needs to be moved. is there a different water pump i can run instead of the stock mercury?


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