00 35 sonic porpoiseing problem ?

26sonic · 07-04-2009, 03:54 PM

this hull is before the change to the hull to stop this problem. what can cut down on the porposeing problem diff. props etc. and if diff. props would help what brand and pitch boat has twin 500's.

HiPerf2000 · 07-05-2009, 01:57 AM

i run hydros on my 35. gives it more stern lift and the boat runs flatter and keeps the bow down. i ran bravos before and the hydros made it better. I still get a bit of porpoise between 3000 - 3500 rpms, but i just run a touch of tab and it fixes it. over 3500 its fine.

45sonic · 07-06-2009, 07:51 PM

Different setups on each boat can make a difference. 358 were known to porpoise (OK let's have it from you 358 owners). Some would launch of a wave and come down hard on the starboard side, others would not. If you get one try what hiperf2000 said and go from there. If you need any help let me know what you try and I will try and point you in the right direction

Here's Johnny · 07-07-2009, 03:38 AM

I have an "02" 358 and yes there is a small tendancy to porpoise. To help me with this issue I had a friend stay outside my boat (while on blocks) while I adjusted the tabs to be perfectly level with the hull. I then took note what number my indicator was at.... Now I know exactly where my tabs are. It only needs a little bit of tab to stop the porpoise.....once I run through it I raise the tabs up and the boat takes set... Not knowing the level of your tabs you may think they are in the water but they may not be. Just my 2 cents....... and it helped a lot for me.....

Sydwayz · 07-07-2009, 09:31 AM

Quote:

Originally Posted by Here's Johnny

I have an "02" 358 and yes there is a small tendancy to porpoise. To help me with this issue I had a friend stay outside my boat (while on blocks) while I adjusted the tabs to be perfectly level with the hull. I then took note what number my indicator was at.... Now I know exactly where my tabs are. It only needs a little bit of tab to stop the porpoise.....once I run through it I raise the tabs up and the boat takes set... Not knowing the level of your tabs you may think they are in the water but they may not be. Just my 2 cents....... and it helped a lot for me.....

Excellent advice for anyone. I have two known values actually marked on my trim indicator window with a Sharpie. Neutral for tabs and trailing edge of tabs even with plane of bottom of boat (which is down about 1 "tick"). Also, neutral for drives, and ideal running sweet spot (which my boat like a little bit of trim). If you can set these values permanently, and start from there each time you ride, it's makes dialing in for daily different conditions a lot easier.

GO4BROKE · 07-07-2009, 12:04 PM

I used automotive stick on pin stripe for my marks, that way its removeable.
Haven't done it for the 386 yet, it also helps you check and adjust your indicators to be sure they read the same side to side when positioned identical.