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T-H Marine Atlas Micro Jacker for Sport 15?
Weatherly	#41  Posted on 12/08/13 - 6:39 AM
Member Posts: 752 Comments: 4 Joined: 12/31/06	those brass tubes are the root of all evil for water infiltration into the hulls on these boats There is nothing wrong with using brass as through hull tubes on a BW Rockland, MA manufactured hull. Original installation of brass tubes was done at BW Rockland, MA factory using only a rubber o-ring on each end of the brass tube. The o-ring deteriorated over a period of time; water then leaks into the tube area. If the brass tube seal is not repaired, water infiltration and damage to the wood core can result. This is a basic maintenance issue on all BW hulls with brass drain tubes. It is perfectly fine to install new brass drain tubes; however, it is necessary to use a polysulfied caulk or equivalent sealer, or a technique like Eric described, when installing the new brass tubes. It is nearly impossible for a DIY'er boat owner to flare stainless tubing. It is easy for a DIY'er BW owner to install brass through hull tubes, following the thoroughly documented techniques described by Mr. Tom Clark. A search on this site will reveal the instructions.
wlagarde	#42  Posted on 12/08/13 - 7:01 AM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	Weatherly - In your opinion, Are 3M 4200 and/or 3M 5200 sealants an acceptable equivalent to polysulfide sealant? 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
Weatherly	#43  Posted on 12/08/13 - 7:10 AM
Member Posts: 752 Comments: 4 Joined: 12/31/06	Yes. I have used both, but I prefer 4200 because it is easier to remove than 5200.
wlagarde	#44  Posted on 12/08/13 - 9:15 PM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	Well I finished the job (pics added to personal page). Now the transom looks new and I have the motor mounted appropriately. The new brass tubes will be installed when they arrive this week. I must say spraying and finishing the gelcoat wasn't as bad as I thought it was going to be. Edited by wlagarde on 12/08/13 - 9:18 PM 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
wlagarde	#45  Posted on 12/10/13 - 11:03 PM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	Also, in case anyone is interested here are the details about the gelcoat work: Once the transom was prepared, I cleaned the surface with acetone and sprayed 3 coats of Spectrum light grey Boston Whaler factory-matched gelcoat (http://www.spectrumcolor.com/ProductD...amp;key=it) using a Preval sprayer (http://shop.preval.com/collections/pr...al-sprayer). All coats were thinned 10% with acetone. The first two coats were sprayed without surfacing agent and the final coat with Spectrum-provided surfacing agent added. I allowed the gelcoat to cure 1hr between coats and 24hrs before final sanding/polishing. I sanded out the orange peel with 220 wet and then moved up through 400, 800, 1000 wet followed by compound and then wax. 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
Joe Kriz	#46  Posted on 12/11/13 - 10:05 AM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	Looks great. Good job on the transom and raising the motor using the Green holes.
wlagarde	#47  Posted on 12/21/13 - 6:47 AM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	Thanks for the compliment Joe - I installed the thru-hull drain tubes (updated personal page with photos). A little tricky if you try to use the flaring tool with the bolt provided. I made a modified air chisel/flaring tool like Tom Clark describes http://www.whalercentral.com/articles...icle_id=42 and it worked like a charm. 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
wlagarde	#48  Posted on 12/21/13 - 3:04 PM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	The photos for this project have been relocated to a project album: http://www.whalercentral.com/userphot...lbum_id=64 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
wlagarde	#49  Posted on 04/12/14 - 2:29 PM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	I raised my engine up another hole (all the way up). In this position it aerates a little as it rises onto the plane (trimmed in neutral position) and I don't see any additional performance increase so I lowered it back to the 2 holes up position. Tom/Joe - Do you think this is related to the Solas New Saturn prop I have installed or is it just that optimal for my setup is 2 holes up? 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
Tom W Clark	#50  Posted on 04/13/14 - 8:16 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	Different propeller have different tolerances of motor mounting heights. I am not a fan of Solas propellers. I'd try a different propeller and see how it does. What was the measured boat speed at the different mounting heights?
wlagarde	#51  Posted on 04/13/14 - 9:20 AM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	Down 1 hole its just tipping between 38 and 39mph on GPS w/ rpm @ 5700. All the way up gets 39 solidly and rpm is slightly higher. Gear ratio is 1.85. Prop is solas new saturn stainless 14p 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
Tom W Clark	#52  Posted on 04/13/14 - 9:24 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	That's pretty damn good.
wlagarde	#53  Posted on 04/13/14 - 10:22 AM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	OK as long as you think I'm optimized I'll leave it be. 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
Tom W Clark	#54  Posted on 04/13/14 - 12:15 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	Well, that depends on what "optimized" means to you? You might be able to find a prop/motor height that is faster, if that is what you want. You might find a prop/motor height that offers better acceleration, if that is what you want. If you're happy with what you have, I'd leave it be.
wlagarde	#55  Posted on 04/13/14 - 4:30 PM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	SO if I were to optimize around speed which propeller would you recommend? 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
Tom W Clark	#56  Posted on 04/14/14 - 7:30 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	10-1/2" x 13" Stiletto Triad or Turbo Hot Shot
wlagarde	#57  Posted on 04/14/14 - 3:38 PM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	Thanks Tom - I'll try this out. 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
dgoodhue	#58  Posted on 04/14/14 - 8:06 PM
Member Posts: 278 Comments: 0 Joined: 10/04/05	The engine is mounted to the transom, right? 39mph out a 50hp/classic 15' is excellent. For reference, I would expect to see 40mph out of a 60hp/15' I am just not sure how much more speed your going to see with a prop change. You might like the new prop better for grip or acceleration. I know that I like my stiletto better than my OMC SST even though they had the same top speed, cruise speed. The stiletto just seem to have more grip. If you want additional top speed, I would spend it on a jack plate. I think you would be lucky to get 1mph with a new prop. The jack plate should be worth 3mph with the right prop. (You might need a new prop though for the jackplate, it would probably push your rpm up another 400rpm.) Dave
wlagarde	#59  Posted on 04/15/14 - 2:54 PM
Member Personal Page Project Albums Posts: 442 Comments: 2 Joined: 07/21/13	Yes I agree but for me its just not worth the $1000. 1976 Sport 15 w/ 2005 50hp Nissan 2 stroke
jamesgt727	#60  Posted on 04/15/14 - 4:55 PM
Member Personal Page Project Albums Posts: 360 Comments: 0 Joined: 01/17/11	jack plate won't get you any attributable benefit except porpoising. You have hit the wall of performance, the only thing left to do is modify the hull. I can assure you I am the most experienced with the 15' hull and mods. Extending the strakes to the transom will transform your hull into a faster more stable machine. You are just a bit under powered to really be concerned with one or two mph. At this point you would be best served to get a bigger motor, a sweet used 70 or 90 Yamaha 2-stroke. And if that's not enough i know plenty of mods for the motor to take you to 50+ safely.