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  speed? or not to speed?

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Author Topic:   speed? or not to speed?
Magnum posted 03-21-2002 08:26 PM ET (US)   Profile for Magnum   Send Email to Magnum  
curious, what is the maximum speed rating recommended by BW for a classic 16' hull?
Taylor posted 03-21-2002 08:45 PM ET (US)     Profile for Taylor  Send Email to Taylor     
Max HP rating is 100. Speed depends on load and setup. 40-45 mph is a number I've seen claimed. I have 100hp and I can't see wanting any more, its more than enough. I'm going to have to get myself a GPS and find out what it really does.
Drisney posted 03-21-2002 10:29 PM ET (US)     Profile for Drisney  Send Email to Drisney     
I have a classic 16 hull with an Evinrude 70 on it . Top speed is a little over 25. I usually can't go even that fast but quite a few times I wish it was a little more.... But a lot of older guys here (west) coast fish classic 16 with 50 hp.
Dave
Magnum posted 03-21-2002 10:40 PM ET (US)     Profile for Magnum  Send Email to Magnum     
Thanks for the reply. I have an '84 Johnson 140 "Looper" on my boat only because it came that way. I know that it is overkill, but the older gentleman that I purchased the boat from put it on in '84. When I tested the boat, we checked the GPS and coasting @ 52 was comfortable. I'm just wondering what speed would be too much for the hull not that I'm wanting to go any faster. I just don't want to push it! In the future, I would like to re-power the boat with a F-100 Yamaha 4-stroke so that I am legal to tourny fish and meet proper CGR's.
EasyE posted 03-21-2002 10:43 PM ET (US)     Profile for EasyE  Send Email to EasyE     
With a 70hp it does a little over 25mph?? I use to use a soggy floored, very waterlogged 16 with a beat up 40hp evinrude that did 28.6 mph on my magellan with me and a full 6 gallons of fuel. Whenever I toke a walk to the bow the floor under me would sink about an inch and water would squirt out the deck.
You better get that 70 checked buddy, I can just imagine the fuel your wasting.
Oh and a 16' whaler isn't design to be ran over 45mph.-EasyE
lhg posted 03-22-2002 02:21 AM ET (US)     Profile for lhg    
For 11 years I ran my 1971 Nauset with a 1973 Merc in-line 6 150HP (powerhead rated in those days) engine. It would run about 55mph, which is about the limit for the hull if you ask me. But it would handle it, as long as you were VERY careful.
Bigshot posted 03-22-2002 09:48 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I saw a 17 montauk with a 175 Merc black max on a trailer......yeah baby!
Salmon Tub posted 03-22-2002 10:48 AM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
It is simple, more horses means more torque (dejavu). More torque allows for a higher pitched prop, and higher pitch allows for faster speed. Then there is drag which is a factor of hull shape, weight... I guess if you put on a 200 or 250 hp engine, if it is not too heavy, and didn't accelerate too fast, you could probably get away with a really large pitch and fly like one of those bass boats.
Bigshot posted 03-22-2002 11:42 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Not in a Montauk. Everyhull has a top speed and after that you literally have to double the Hp to get maybe 10mph. A montauk with a 100 can hit say 48. Double that to 200hp and you might get the 10mph.

A montauk with a 50 does 35mph, double that and you get the 10mph, etc.

Dick posted 03-22-2002 11:58 AM ET (US)     Profile for Dick  Send Email to Dick     
Bigshot

You are right on the money. My Montauk with a Merc 50/4stk does 33. If I left the wife, dog and a lot of other crap at home I probably could hit 35.

Bigshot posted 03-22-2002 01:04 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
You bring a wife on your boat? That is a major disregard for maritime law:)
fireball posted 03-30-2002 02:44 PM ET (US)     Profile for fireball  Send Email to fireball     
Bigshot: you should further tell these speedsters that a Montauk with a ninety is dangerous-a sharp turn at 40 can cut a sponson and she will flip like a Volvo without a roll cage, f
TightPenny posted 03-30-2002 05:29 PM ET (US)     Profile for TightPenny  Send Email to TightPenny     
When you use enough ballast (aka operator), you don't worry about going too fast with the 90, but you don't have to worry about getting up on plane.

Besides for us old folk, the extra ponies are not used for speed, but just in case we need it. The ninety allows for nice comfortable cruising at 4000 RPM.

mattosan posted 03-31-2002 01:11 AM ET (US)     Profile for mattosan  Send Email to mattosan     
How fast should a 67 sakonett with a johnson 85 hp go???
Bigshot posted 04-01-2002 09:51 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
It should do about 38-40....what it does is another question.
Arch Autenreith posted 04-01-2002 10:59 AM ET (US)     Profile for Arch Autenreith  Send Email to Arch Autenreith     
Just for clarification....planning hulls themselves don't have a maximum speed but is limited only by aerodymamics (AKA wind resistance).

Wind resistance squares for every 10 mph increase. It's been awhile since I've had this discussion but if memory serves me ok I'm not too far off.

So I think this is similar to what was referred to here. To increase speed (relative to wind resistance) does require more hp than one might think, as is evident by the information stated above.

tomol posted 04-01-2002 08:35 PM ET (US)     Profile for tomol  Send Email to tomol     
I run a 100 4-stroke on my '72 16ft. It's heavy and soggy with large fuel tank in front of the console that cramps the boat's style at WOT. With that: 41 mph, but I need a little chop to get that speed. In glassy water, I get about 38 mph.

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