Search found 8960 matches

by jimh
Sun Apr 11, 2021 11:37 pm
Forum: PERFORMANCE
Topic: Sport 15, 30-HP
Replies: 1
Views: 17

Re: Sport 15, 30-HP

See the REFERENCE Section article on the 15-foot hull. The minimum horsepower to put the 15-foot hull on plane is given there: http://continuouswave.com/whaler/reference/15/ The minimum horsepower recommendation (20-HP) is for a very lightly loaded boat. I recommend you buy a new Yamaha F50. You wil...
by jimh
Sun Apr 11, 2021 11:24 pm
Forum: REPAIRS and MODIFICATIONS
Topic: 1986 Montauk Rot
Replies: 2
Views: 38

Re: 1986 Montauk Rot

Embedded wood under the cockpit deck can become rotted and soft if freshwater has been allowed to get through holes in the deck laminate and gel coat and seep into the wood. Even boats kept in saltwater can get fresh water under the deck if rain has been allowed to accumulate and the deck has unseal...
by jimh
Sun Apr 11, 2021 11:12 pm
Forum: The GAM
Topic: 180 DAUNTLESS Changes During Production Epoch
Replies: 2
Views: 18

Re: 180 DAUNTLESS Changes During Production Epoch

What changed in the the design of a 180 DAUNTLESS over its years? Can you be more specific about the year range that is "over its years"? What year was the 180 DAUNLTESS introduced? What year did 180 DAUNTLESS production end? Re other articles on the 180 DAUNTLESS: to find resources on th...
by jimh
Sun Apr 11, 2021 9:31 am
Forum: PERFORMANCE
Topic: 2001 Montauk 17 115-HP
Replies: 11
Views: 1077

Re: 2001 Montauk 17 115-HP

Please renew this thread when you get another propeller and have more test data to present.
by jimh
Sat Apr 10, 2021 9:39 pm
Forum: SMALL BOAT ELECTRICAL
Topic: Battery Has Odor of Vinegar
Replies: 3
Views: 83

Re: Battery Has Odor of Vinegar

Adding water to a lead-acid battery electrolyte dilutes the concentration of the acid and reduces the electrical stored charge in the storage battery. If the electrolyte level is low, water should be added to restore the electrolyte to the proper level, and then the battery should be charged to incr...
by jimh
Sat Apr 10, 2021 5:50 pm
Forum: MARKETPLACE
Topic: Appraisal: 1989 Eagle Tandem Axel Trailer
Replies: 3
Views: 85

Re: Appraisal: 1989 Eagle Tandem Axel Trailer

I cannot see much detail in Figure 1, but my general experience with EAGLE trailers--made near me and popular--is they generally have all the hull support brackets welded in place. The trailer is more or less custom or unique to the boat that is to be trailered on it. For that reason, the value of t...
by jimh
Sat Apr 10, 2021 5:43 pm
Forum: The GAM
Topic: A c.1985 SPORT 15: Island Shuttle; Work; Plans; Weather, Future
Replies: 4
Views: 517

Re: A c.1985 SPORT 15: Island Shuttle; Work; Plans; Weather, Future

Re the confusion over the year of manufacture: the federal HIN will clearly identify the model year and year of production. Re the SPORT 15: the best small skiff ever made. I used to have one and loved that boat. By the way, your SPORT 15 has the seat back option. That is a nice upgrade from the pla...
by jimh
Sat Apr 10, 2021 1:35 pm
Forum: REPAIRS and MODIFICATIONS
Topic: Steering Wheel Paracord Wrap
Replies: 1
Views: 197

Re: Steering Wheel Paracord Wrap

Is there a particular reason the knots are on the outside diameter of the outer tube of wheel?

I would expect that having the knots on the inside edge would give the palm of your hand on the wheel a better feel.
by jimh
Fri Apr 09, 2021 11:05 am
Forum: The GAM
Topic: 170 Montauk on Hoist
Replies: 13
Views: 320

Re: 170 Montauk on Hoist

Regarding why Boston Whaler explicitly cautions against lifting the 170 MONTAUK by its lifting eyes for "long term", it has been suggested that this is due to concern about exposing Boston Whaler to risk of being "liable" for some future harm. I think the risk is clearly laid out...
by jimh
Fri Apr 09, 2021 10:58 am
Forum: The GAM
Topic: 170 Montauk on Hoist
Replies: 13
Views: 320

Re: 170 Montauk on Hoist

In order to create the least stress on the attachment points on the boat for hoisting, the direction of the lifting force should be completely vertical, that is, the hoist rope (or chain or strap) should be hanging down perfectly vertically when connected to each eye. In this way there won't be any ...
by jimh
Fri Apr 09, 2021 10:24 am
Forum: The GAM
Topic: 170 Montauk on Hoist
Replies: 13
Views: 320

Re: 170 Montauk on Hoist

What is the dimension for the distance between the I-beams the support the hoists in Figure 1? Is the location of the hoists on the beam supports fixed or moveable? From Figure 1 I infer the boathouse is open to the sea on the right. [Note: I reoriented the image files in Figure 1 and 2 to make the ...
by jimh
Fri Apr 09, 2021 10:01 am
Forum: MARKETPLACE
Topic: Appraisal: 1989 Eagle Tandem Axel Trailer
Replies: 3
Views: 85

Re: Appraisal: 1989 Eagle Tandem Axel Trailer

From the boat registration it appears the trailer is located in Ontario, Canada. Since the trailer is a painted steel trailer, I presume that the trailer has been used in freshwater exclusively. If the painted steel trailer has been used in saltwater its value would be lower. If the trailer is in ro...
by jimh
Fri Apr 09, 2021 7:42 am
Forum: SMALL BOAT ELECTRICAL
Topic: Battery Has Odor of Vinegar
Replies: 3
Views: 83

Re: Battery Has Odor of Vinegar

The odor associated with vinegar is acetic acid. A lead-acid battery uses sulfuric acid. The smell of sulfuric acid is somewhat similar to the smell of acetic acid. According to one automotive website, people are known to describe the smell of their battery as being like vinegar. Cf.: https://autogu...
by jimh
Thu Apr 08, 2021 6:17 pm
Forum: The GAM
Topic: Propeller Calculator Restored
Replies: 0
Views: 36

Propeller Calculator Restored

The propeller calculator is back. See

viewtopic.php?f=7&t=6317

for details.
by jimh
Thu Apr 08, 2021 6:09 pm
Forum: PERFORMANCE
Topic: Propeller Calculator Restored
Replies: 0
Views: 43

Propeller Calculator Restored

I am very pleased to announce that I have restored the PROPELLER CALCULATOR at the continuouswave.com website. The new URL is http://continuouswave.com/calculators/propCalc.php As before, I explain in detail all the mathematics employed in the calculations and all the unit conversions that take plac...
by jimh
Thu Apr 08, 2021 6:00 pm
Forum: PERFORMANCE
Topic: 1974 Revenge 21 - 2020 Mercury ProXS 200
Replies: 16
Views: 428

Re: 1974 Revenge 21 - 2020 Mercury ProXS 200

For this data set:
RPM = 6200
RATIO = 1.846
PITCH = 17
SLIP = 2.7

The calculated MPH is 52.6-MPH.

There is no certainty that the absolute most horsepower from the engine is occuring at the absolute maximum engine speed of 6,200-RPM. The horsepower peak might be a bit lower in terms of RPM.
by jimh
Thu Apr 08, 2021 5:10 pm
Forum: REPAIRS and MODIFICATIONS
Topic: Drain Tube Replacement on 13-footer
Replies: 12
Views: 2946

Re: Drain Tube Replacement on 13-footer

Sailfish_wc wrote:I'd like to know myself
Q1: did it have a brass tube like the transom drain?
Q2: Other?


I don't understand what you want to know.

I don't understand in Q1 what "it" refers to.

I don't understand in Q2 what you mean by the single word, "Other".
by jimh
Thu Apr 08, 2021 5:01 pm
Forum: PERFORMANCE
Topic: Super Sport 15 Re-power 60-HP
Replies: 1
Views: 112

Re: Super Sport 15 Re-power 60-HP

What is the gear ratio of the engine? What is the maximum recommended engine speed in RPM? What is the weight of the engine? As a starting point for engine mounting height, installing the engine at one-hole-up from lowest is a safe initial point. Some enthusiasts will recommend starting at two-holes...
by jimh
Thu Apr 08, 2021 1:46 pm
Forum: PERFORMANCE
Topic: 1974 Revenge 21 - 2020 Mercury ProXS 200
Replies: 16
Views: 428

Re: 1974 Revenge 21 - 2020 Mercury ProXS 200

Re the ENERTIA and what might occur with a pitch down to 17 from 18: The initial test propellor was a Mirage 15.5 x 17p: Top speed was 50-MPH SOG by GNSS at 6100-RPM. That works out to a SLIP of 5.8. That is about what I would expect with a MIRAGE plus and that is a good value. With an Enertia 14.2 ...
by jimh
Thu Apr 08, 2021 1:40 pm
Forum: PERFORMANCE
Topic: 1974 Revenge 21 - 2020 Mercury ProXS 200
Replies: 16
Views: 428

Re: 1974 Revenge 21 - 2020 Mercury ProXS 200

Also, and not to be overlooked: that Mercury ProXS V8 looks marvelous on your extremely well-preserved (and I image extremely well-restored) REVENGE 21. As for top speed, heck, 52-MPH is like a rocket ship for me. The boat is 47-years-old. If you want to get another 47-years of use from it, you prob...
by jimh
Thu Apr 08, 2021 1:29 pm
Forum: The GAM
Topic: Aqua One Bottom Paint
Replies: 4
Views: 307

Re: Aqua One Bottom Paint

ASIDE: with almost all of my boating now in the cold, clear, freshwater of Lake Michigan, I don't worry about marine growth and anti-fouling paint, and because the boat is never in the water for more than perhaps one week at most at any stretch, I don't worry about using a bottom sealing coat. The b...
by jimh
Thu Apr 08, 2021 10:23 am
Forum: SMALL BOAT ELECTRICAL
Topic: Power Distribution on 13-foot Skiff
Replies: 8
Views: 384

Re: Power Distribution on 13-foot Skiff

Regarding accommodation in electrical wiring for devices that are anticipated to need frequent removal or that will be fabricated as separate assemblies and then joined electrically upon installation: the most common method to provide for a simple disconnect between electrical cables is to use a con...
by jimh
Thu Apr 08, 2021 7:41 am
Forum: SMALL BOAT ELECTRICAL
Topic: Power Distribution on 13-foot Skiff
Replies: 8
Views: 384

Re: Power Distribution on 13-foot Skiff

PATSEA--I don't see any Blue Sea Systems product with part number 4056. I think that number is wrong. But I like the concept of a Blue Sea Systems water-resistant fuse panel. I searched at Blue Sea Systems and found they have a new product, a water-resistant fuse panel, that is part number 5056. Thi...
by jimh
Thu Apr 08, 2021 7:37 am
Forum: REPAIRS and MODIFICATIONS
Topic: Outrage 22 Cuddy Leak Repair
Replies: 5
Views: 220

Re: Outrage 22 Cuddy Leak Repair

Posting a question or a request in this thread to someone who made a comment 18-years ago in another thread is not a particularly good way to get their attention. As it happens, the person you are addressing is still participating in the website. You should send him an email. His username is "D...
by jimh
Thu Apr 08, 2021 7:12 am
Forum: The GAM
Topic: 170 Montauk on Hoist
Replies: 13
Views: 320

Re: 170 Montauk on Hoist

With regard to the exact duration of a period of time described as "short-term", I would ask Boston Whaler for a specification. To me, short-term means an hour. What Boston Whaler is clearly saying: don't hoist the 170 MONTAUK by the bow and stern eyes and let it hang that way for days or ...
by jimh
Thu Apr 08, 2021 6:49 am
Forum: The GAM
Topic: FRONTIER Value, Ride
Replies: 5
Views: 252

Re: FRONTIER Value, Ride

Re the OFFSHORE 27: I have always admired the look of the OFFSHORE 27. I have never been aboard one. I was somewhat surprised to read some less than enthusiastic comments about the ride qualities of the 27-foot classic hull from someone who was out on one in the Pacific Ocean. The classic 25-foot hu...
by jimh
Thu Apr 08, 2021 6:18 am
Forum: PERFORMANCE
Topic: 1974 Revenge 21 - 2020 Mercury ProXS 200
Replies: 16
Views: 428

Re: 1974 Revenge 21 - 2020 Mercury ProXS 200

sraab928 wrote:The center of the upper mounting hole in the transom to the top of the transom is 1-3/4-inch
Thanks for checking. That hole location is, if anything, a bit high, and not too low as I thought it was from the picture. The usual dimension is 1-7/8-inches.
by jimh
Wed Apr 07, 2021 10:01 am
Forum: PERFORMANCE
Topic: 1974 Revenge 21 - 2020 Mercury ProXS 200
Replies: 16
Views: 428

Re: 1974 Revenge 21 - 2020 Mercury ProXS 200

Please check the location of the upper engine mounting holes on the transom. Refer to this image hosted elsewhere: https://hosting.photobucket.com/images/v472/sraab928/IMG_5889(1).jpg As seen in the image linked above, the upper pair of holes apper to be drilled more than 2-inches below the top of t...
by jimh
Wed Apr 07, 2021 9:58 am
Forum: PERFORMANCE
Topic: 1974 Revenge 21 - 2020 Mercury ProXS 200
Replies: 16
Views: 428

Re: 1974 Revenge 21 - 2020 Mercury ProXS 200

Please check the location of the upper engine mounting holes on the transom. In one of the linked images, it looks to me like the upper pair of holes is drilled more than 2-inches below the top of the transom. I am judging that based on the hole spacing of 0.75-inch. There are two empty holes above ...
by jimh
Wed Apr 07, 2021 8:16 am
Forum: The GAM
Topic: Aqua One Bottom Paint
Replies: 4
Views: 307

Re: Aqua One Bottom Paint

In your review of Aqua One anti-fouling paint there is no information about the ability of Aqua One paint to resist formation of marine growth. Please follow up with your observations about how Aqua One performs as an anti-fouling paint, how well it withstands abrasion from just running the boat at ...
by jimh
Wed Apr 07, 2021 7:28 am
Forum: REPAIRS and MODIFICATIONS
Topic: Propeller Trim Tab Confusion
Replies: 2
Views: 192

Re: Propeller Trim Tab Confusion

The element of the outboard engine that has changed, particularly with larger engines like a V6 engine, is the use of hydraulic steering. There is no feedback at the helm steering wheel from propeller torque with hydraulic steering, whereas with mechanically linked steering or wire-rope-and-pulley s...
by jimh
Tue Apr 06, 2021 9:49 pm
Forum: PERFORMANCE
Topic: 1974 Revenge 21 - 2020 Mercury ProXS 200
Replies: 16
Views: 428

Re: 1974 Boston Whaler Revenge 21 - 2020 Mercury ProXS 200

The gear driving the propeller shaft has 24 teeth and the pinion gear on the engine shaft has 13 teeth. The pinion gear is always the smaller gear. The ratio comes from 24/13 = 1.846:1

The engine has to make 1.846 revolutions to produce one revolution of the propeller shaft.
by jimh
Tue Apr 06, 2021 1:14 pm
Forum: The GAM
Topic: Trailer Brands; Trailer Brakes
Replies: 11
Views: 469

Re: Trailer Brands; Trailer Brakes

Regarding disadvantages of various trailer brake methods: The Electric-Over-Hydraulic (EOH) brake actuators generally require a 12-Volt high-current circuit be provided to the trailer from the towing vehicle to operate the electric motor for the hydraulic pump and a local battery as back-up. This lo...
by jimh
Tue Apr 06, 2021 10:43 am
Forum: REPAIRS and MODIFICATIONS
Topic: 1962 13-footer Identifying Hull Materials
Replies: 6
Views: 386

Re: 1962 13-footer Identifying Hull Materials

Figure 7 appears to show damage to the foredeck at the bow, with the original blue deck laminate having suffered some fractures and some of the interior foam dark from mildew. I think you are now committed to more work. You will have to repair the areas of damage to the hull deck that have been reve...
by jimh
Tue Apr 06, 2021 10:33 am
Forum: SMALL BOAT ELECTRICAL
Topic: Power Distribution on 13-foot Skiff
Replies: 8
Views: 384

Re: Power Distribution on 13-foot Skiff

Why was a power distribution panel with terminal AND a terminal block used? Isn't just need one set of terminals needed, not two? It appears that the wiring includes some intermediate circuit elements such as switches between the terminals on the power distribution panel on the left in Figure 1 and...
by jimh
Tue Apr 06, 2021 10:30 am
Forum: SMALL BOAT ELECTRICAL
Topic: Power Distribution on 13-foot Skiff
Replies: 8
Views: 384

Re: Power Distribution on 13-foot Skiff

Q1: is using a secondary power distribution center the best method to provide power at the helm for accessories? Even on a small 13-foot boat, electrical power should be distributed from a secondary panel, not by use of multiple connections directly to the battery terminals. The Blue Sea Systems fu...
by jimh
Tue Apr 06, 2021 10:09 am
Forum: REPAIRS and MODIFICATIONS
Topic: 1985 SPORT 15 Deck Repair: Best Adhesive; Best Sealant
Replies: 4
Views: 192

Re: 1985 SPORT 15 Deck Repair: Best Adhesive; Best Sealant

Q3: what is the best product and best method to re-install the fiberglass deck that was cut out for repair of the underlying wood? Assuming the section of deck that was cut out has been repaired with the underneath reinforcement wood bonded to the deck, I would just lay the deck section back into p...
by jimh
Tue Apr 06, 2021 10:01 am
Forum: REPAIRS and MODIFICATIONS
Topic: 1985 SPORT 15 Deck Repair: Best Adhesive; Best Sealant
Replies: 4
Views: 192

Re: 1985 SPORT 15 Deck Repair: Best Adhesive; Best Sealant

Florida15Sport wrote:Q2: what is the best product and the best method for sealing holes in the fiberglass cockpit deck sheet?
For advice on repairs to hull gel coat and laminate surfaces, see:

INSTRUCTIONS -- HULL PATCH KITS
by jimh
Tue Apr 06, 2021 9:53 am
Forum: REPAIRS and MODIFICATIONS
Topic: 1985 SPORT 15 Deck Repair: Best Adhesive; Best Sealant
Replies: 4
Views: 192

Re: 1985 SPORT 15 Deck Repair: Best Adhesive; Best Sealant

Q1: what is the best product and best method to stick down or adhere or glue the replacement plywood reinforcement pieces to the foam before putting the fiberglass floor surface back in? Note that originally the wood reinforcement was not bonded to the foam, it was bonded to the deck section. Appar...
by jimh
Tue Apr 06, 2021 9:48 am
Forum: REPAIRS and MODIFICATIONS
Topic: 1985 SPORT 15 Deck Repair: Best Adhesive; Best Sealant
Replies: 4
Views: 192

Re: 1985 SPORT 15 Deck Repair: Best Adhesive; Best Sealant

Q4; what is the best product and best method to seal [the joint lines between the original deck and the fiberglass deck section that was cut out]? In the original construction of Boston Whaler boats where a removable deck center deck section was used, the joint line between the fixed deck and the r...
by jimh
Tue Apr 06, 2021 9:21 am
Forum: The GAM
Topic: ID Stamped in Storage Well
Replies: 1
Views: 162

Re: Stencil Serial Number

The question you are asking is a frequently-asked question and the answer has been prepared many years ago. You can find the answer by reading the FAQ--FREQUENTLY ASKED QUESTIONS--section of the website. Here is a link to the FAQ: http://continuouswave.com/whaler/reference/FAQ/ The specific answer t...
by jimh
Mon Apr 05, 2021 10:32 am
Forum: REPAIRS and MODIFICATIONS
Topic: Dauntless 13 - Rotten Wood - opinions needed
Replies: 3
Views: 196

Re: Dauntless 13 - Rotten Wood - opinions needed

A boat with a legacy and provenance is always worth more effort in restoration. You may find this article to be interesting:

Grandfather's Whaler--a 1959 classic reborn
http://continuouswave.com/whaler/cetacea/cetaceaPage51.html
by jimh
Mon Apr 05, 2021 10:29 am
Forum: The GAM
Topic: Request for appraisal, 2011 170 Montauk
Replies: 10
Views: 425

Re: Request for appraisal, 2011 170 Montauk

On a corollary observation, maintaining very high used-boat prices in the Boston Whaler line is strategic for selling larger boats. The ideal Boston Whaler customer is a new boater. New-boater walks into a dealer and buys a starter boat, a 170 MONTAUK. He pays $40,000. A year or two goes by, and new...
by jimh
Mon Apr 05, 2021 10:22 am
Forum: The GAM
Topic: Request for appraisal, 2011 170 Montauk
Replies: 10
Views: 425

Re: Request for appraisal, 2011 170 Montauk

Regarding the change in the 170 MONTAUK that occurred in 2018, here are some comparisons: 170 MONTAUK Weights and Prices pre-2018 post-2018 1,400-lbs 1,700-lbs $30,971 $32,241 The pre-2018 170 MONTAUK cost about $22.12-per-pound. The post-2018 170 MONTAUK cost about $18.96-per-pound On the basis of ...
by jimh
Mon Apr 05, 2021 6:11 am
Forum: REPAIRS and MODIFICATIONS
Topic: Dauntless 13 - Rotten Wood - opinions needed
Replies: 3
Views: 196

Re: Dauntless 13 - Rotten Wood - opinions needed

Q1: What is the true location and dimensions of the wood in the Dauntless 13 transom? I don't see any indication in the drawing shown above of the location of the wood in the transom. The drawing appears to show only wood reinforcements in the deck or liner section, not in the hull transom. I recom...
by jimh
Mon Apr 05, 2021 5:45 am
Forum: The GAM
Topic: Request for appraisal, 2011 170 Montauk
Replies: 10
Views: 425

Re: Request for appraisal, 2011 170 Montauk

The basis of my appraisal is as follows; the cost of the current model 170 MONTAUK will be representative of the replacement cost for any 170 MONTAUK made previously. There is not another source of new 170 MONTAUK boats than buying them at retail from Boston Whaler. A replacement 170 MONTAUK is now ...
by jimh
Sun Apr 04, 2021 10:37 am
Forum: The GAM
Topic: Trailer Brands; Trailer Brakes
Replies: 11
Views: 469

Re: Trailer Brands; Trailer Brakes

When towing my boat trailer the total towed weight is over 5,000-lbs. I can tell if the trailer surge brakes are not working as soon as I apply the truck brakes. The braking response between with-trailer-brakes-working and with-no-trailer-brakes is very distinct. The trailer has brakes on both axles...
by jimh
Sun Apr 04, 2021 7:55 am
Forum: SMALL BOAT ELECTRICAL
Topic: A New Method to Calculate Voltage Drop, Wire Gauge, and Circuit Length
Replies: 2
Views: 159

Re: A New Method to Calculate Voltage Drop, Wire Gauge, and Circuit Length

Thanks for the kind words on the article on calculating voltage drop with my Ampere-feet method. I hope you find it useful. Re the resistance of copper wire that has been tinned: I doubt there is any significant difference compared to bare copper wire. The AWG gauge of the wire is a measure of its c...
by jimh
Sat Apr 03, 2021 11:29 am
Forum: The GAM
Topic: Request for appraisal, 2011 170 Montauk
Replies: 10
Views: 425

Re: Request for appraisal, 2011 170 Montauk

The asking price of $24,000 sounds reasonable to me.

It seems like a 2021 170 MONTAUK now costs about twice that. I really have not made a thorough and scientific study.

A much older 170 with a two-stroke-power-cycle engine recently sold for about $18,000.
by jimh
Sat Apr 03, 2021 10:48 am
Forum: The GAM
Topic: Jet-Drive Outboard for SUPER SPORT 15
Replies: 5
Views: 259

Re: Jet-Drive Outboard for SUPER SPORT 15

For older hull there was no specification provided by Boston Whaler for maximum engine weight. This topic was discussed 17-years ago in an intelligent manner. See Maximum Engine Weight http://continuouswave.com/ubb/Forum4/HTML/002449.html A reasonable figure for maximum engine weight for the 15-foot...