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70 Yamaha 15' standard
huckelberry145	#21  Posted on 03/04/13 - 2:24 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	Today, I dropped the motor 1 bolt hole and headed back to the river, with the stiletto 13 1/4 x 15. Just me in it, boat porpoised just as bad and pulled hard to starboard. Loaded the boat and headed to Charleston marine so Chris could look at this thing and tell me what I'm doing wrong. His synopsis: raise the motor and loose the stiletto. My next stop was Skips propeller where Mike let me hold a power tec 13x15. Went home raised the motor back up and put the new prop on and went back to the river. Still not enough pitch because I was hitting 6k before I was at wot, But, no porpoise, no starboard pull and I was running about 35 mph at 56/5700 rpm. I'm going to try an aluminum 13x19 that came with the motor to see what rpm that puts me at. Then I plan on getting a not so aggressive either power tech or Yamaha black stainless. I'll keep y'all up to date.
huckelberry145	#22  Posted on 03/05/13 - 3:22 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	I think i found the reason why my boat porpoises so badly. I checked my hull with a 6' straight edge again today and found a 3/16" difference between the port and starboard sides. It starts about 2 1/2 feet from the transom forward and is about 1 1/2' wide running from the centerline of the keel to the chine. It is basically a flat spot on the starboard side where the port side has a more rounded shape. Part of the fill and repair will be under the the trailer bunk. Will leveling compound work or should I cut it down to the glass and fill with glass and resin. Edited by Joe Kriz on 03/05/13 - 7:15 PM
wing15601	#23  Posted on 03/05/13 - 8:05 PM
Member Posts: 699 Comments: 0 Joined: 07/14/12	I don't know, Huckleberry, that is a mighty small hook. I would think any influence it would have on the boat while on plane would be to cause it to lean to the opposite side. I believe that with the correct setup of the engine and the correct prop, the porpoising problem will go away. In certain conditions of waves and wind you can make any boat porpoise. I'm sure you'll resolved the issue. I winter in Ft. Myers and summer in St. Joseph, Michigan. It’s now about 12 years since I’ve joined this group. I gave my 1972 whaler to my daughter and sold the 17’. Bought an O’Day 28 sailboat and sailed on Lake Michigan. Yesterday I bought a 2005 130 Sport.
jamesgt727	#24  Posted on 03/06/13 - 8:54 AM
Member Personal Page Project Albums Posts: 360 Comments: 0 Joined: 01/17/11	Huck, That't the first thing we addressed with my 15, hull inconsistencies and design, then balance.
huckelberry145	#25  Posted on 03/06/13 - 9:53 AM
Member Posts: 401 Comments: 3 Joined: 03/10/12	I can't believe I didn't notice it but it makes perfect sense now. Now that I have found it, I see how I could have missed it. What I really want to do is find another 15' hull that i can look so i know which side is right before I start doing any repairs.
dgoodhue	#26  Posted on 03/06/13 - 12:43 PM
Member Posts: 278 Comments: 0 Joined: 10/04/05	Are you sure your not confusing the term chine walking and porpoising? Dave
huckelberry145	#27  Posted on 03/06/13 - 2:28 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	dgoodhue wrote: Are you sure your not confusing the term chine walking and porpoising? I wish i were. This thing has been porpoising since I bought it, worse after I started trying to get the porpoise out of it, and extremely worse when i put the 70 Yamaha on it. This thing is dangerous to operate. It is so bad it is hard to describe. But, with the help of this site and the people on it i WILL get the problem resolved, properly. Thanks to everyone for their help and input.
jamesgt727	#28  Posted on 03/06/13 - 3:28 PM
Member Personal Page Project Albums Posts: 360 Comments: 0 Joined: 01/17/11	If you need someone to do it for you or if you need practical advise, I can hook you up with my boat builder, Eric. He addressed these problems with hull mods.
huckelberry145	#29  Posted on 03/06/13 - 3:33 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	Thanks, I'll definitely keep that in mind.
Bake	#30  Posted on 03/06/13 - 6:53 PM
Member Personal Page Project Albums Posts: 902 Comments: 8 Joined: 01/30/06	That sounds like a very small divot to be causing so much disruption in the boat sitting up on the pad. I will not say it can’t but it just seems that with a boat only running 35 to 40 mph it would not cause the bow to lift so drastically. Remind me if you ever run the 70 mounted further down and if it bounced when the motor was tucked all the way under.
huckelberry145	#31  Posted on 03/06/13 - 7:45 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	I don't think so bake, when the hull is on plane, or trying to be in my case and, my guess, 30-35% of the hull is deformed, I'm believing that this is my problem. I dropped the motor 1 bolt hole, all I can go without using the blind holes and there was no change in handling. I'm at the point of what else can it be. I'm going back to pick up the prop Tom originally suggested tomorrow, strip and flip the hull then fill and fair and see what that does.
Tom W Clark	#32  Posted on 03/06/13 - 8:36 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	I'm going back to pick up the prop Tom originally suggested tomorrow... Again, I am confused. I thought you already tested that prop (13-1/4" x 17" Advantage) with the motor all the way up? Have you gotten your tachometer sorted out yet? That is important data we have not yet seen. 38-40 MPH is still way too slow for that boat/motor/prop combination.
huckelberry145	#33  Posted on 03/07/13 - 2:23 AM
Member Posts: 401 Comments: 3 Joined: 03/10/12	Tom, I want to get the prop I originally purchased back and start from there for when i get the hull fixed. Tach is set properly now.
Tom W Clark	#34  Posted on 03/07/13 - 6:59 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	OK, gottcha. Your boat should do 44-45 MPH at 6200 RPM.
zotcha	#35  Posted on 03/08/13 - 6:37 AM
Member Posts: 63 Comments: 0 Joined: 08/13/08	Thats what mine does with an F60. Good Luck. If you're ever down towards Bluffton, I have an 1982 and an 1988 15's in the garage if you want to compare anything. Ever stopped by High and Dry Boatworks on James Island? Kirk has tons of knowledge on BW's. zot. Edited by Joe Kriz on 03/08/13 - 11:09 AM
huckelberry145	#36  Posted on 03/11/13 - 1:01 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	I finially got the boat flipped today and found what I think is a bigger problem than I thought. Both port and starboard sides have a rocker but the starboard side is 1/4" bigger, a total of 1/2" from level. The keel is level and the chines are level but in between them it seems to flatten out. the thing is is it's not really centered over where the boat rests on the bunks. This is more than I can handle with my limited boat hull repair knowledge. I don't know what I'm going to do.
Bake	#37  Posted on 03/11/13 - 1:34 PM
Member Personal Page Project Albums Posts: 902 Comments: 8 Joined: 01/30/06	were you planing on gel coating the bottom after you made the repairs?
huckelberry145	#38  Posted on 03/11/13 - 1:53 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	Bake, it looks like if I sand away the high ridge, I will not have much glass left. I'm almost at a loss.
Derwd24	#39  Posted on 03/11/13 - 2:08 PM
Member Posts: 1607 Comments: 9 Joined: 05/09/07	Can you post some pictures of what you're seeing? Dave - 1983 Outrage 22
huckelberry145	#40  Posted on 03/11/13 - 2:13 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	Derwd24 wrote: Can you post some pictures of what you're seeing? I wish I could but I don't own a computer, all I have is a smartphone and I can't figure out how to post photo links to wc.