Over weight boat?

they said it would go that fast,,,,but they NEVER did unless the owner upgraded his powerplant.,,,,,ive help build 5 or 6 of them,,,and painted many many.,,,,but on the other side,,,,,you could overload that boat andd still run it in bad weather,,,,we've been out on them in 15' seas,, and they handle VERY well.,,,,as for all the repowering stuff,,,,,i leave that to the smat dudes,,hehe



:EDIT: ,,,the "stock" prop suks!!

 

I would think so . (More/higher wot) My brother in law is retrofitting one for his son with the 225 deere. He has done alot of homework and found a 24 x 24 works great for those boats with that gear ratio. He thinks the 24 X 24 should exceed 19 mph. Where you have some extra weight you might need to reconfig your wheel as Jango suggests. Those are real nice boats for what they were designed for. "biggest little boats in the bay" They do alot for there size and perform better than quite a few larger boats in its range. Great sea boats.

 

1 more thing,,,,,,,check the transom at the radius at the top,,,,bout 6"over port from center,,,,tap with ya knuckle,,,,,,,,they ALWAYS had an air pocket there,,,,if it doesnt,,,i probably painted it,,hehehehe

 

A Tim built my boat.. did ya build any Duffy & duffy 35s 25 years ago?

 

nope,,,, too long ago for me,,, but only by a year or 2 ,,,and tim wasnt alone,,,usually bout 4 of us hand laying it up.,,but i only helped when they were short on time and needed a fast hand,,,,then they hired my company to paint most of them from 91 or 92 up to about 6 or 7 years ago.,,around there.

 

You may have done one of the kit boats that is local. I think that one falls into that time frame.

 

probably...or at least i "looked" at it,,hehe
them boats dot the sea from maine to florida,,,i cant believe they dont make more then they do.

 

I think that is a Atlantic boat thing. ... i'm having a boat built now. I have a duffy so I thought I would check out the 37 or 38 duffy. Although they did return my call they never sent out any info on them with price sheets. I'd have to say RP boats did the best job of representing their line of boats although I didn't get one.

 

ya maine boat shops are a little "different" from others,,,,,most of them are a few years behind with boats,,and for some reason, no matter how rude they are,,,or how "helpful" they are,,,,they seem to always have boats ordered ahead of time,,hehe,,,,most of the higher end shops dont do much for advertising,,,,,they dont need to
so all that spills over to customer service.,,,, but in the end,, you have 1 of the better boats built anywhere.

 

Jim,

This boat was built in California. There was a person who licensed the hull from BHM for a few years back in the late eighties. I've been in contact with the original owner who finished her. I really do like the boat I'm just not sure I can get used to 10 knots.

 

hemidodge,

My calc show a 26 x 19 or 20 depending on weight. If slightly under 17000, 20 P, if over 17000 use a 19 P. Top speed with the 20 P with 3500rpm motor speed is 16.7 K or 19.2 MPH @ calculated slip of 25%. A fast Bottom could yield a slip of 18% which is probably the Best that can be expected yielding a speed of 21.2 mph. (same prop calculates) This is probably where you will be.
As shaft speed increases, (3500 vrs 2900) Prop Dia can Decrease. This is why you can get by with a slightly smaller wheel.

 

hemidodge

A lot of the commercial guys are repowering with John Deeres here in Alaska. Sounds like the power of choice lately I'll be hoping a propulsion analysis show a few more knots are possible. At 19000 that may be a lot to ask.

 

Bruce,

12.4 knots @ 2850 rpm (2.5 gear) with a 24 pitch Prop, calculates to 45% Slip. This is quite Excessive and can only be the result of a very Fouled Bottom and/or Too Small a Prop with Excessive Pitch.
Ideal Slip for your Hull should be less than 30%.
If you want to check this yourself, see: http://www.go-fast.com/Prop_Slip_Calculator.htm . Be sure to convert knots to mph. i.e. 12.4 k = 14.26 mph

John G.

 

John,

I ran the calcs on go-fast.com and came up with the same 45% slip. Can I be assured a different prop will be less slip or is the slip being caused by a function of the weight which is causing the actual speed?

 

John,

Going to the go-fast.com section on speed calcs I plugged in the actual speed and came up with a constant of 122. What does this mean? The constants on that page seem to be for planing hulls and cats. What is a good constant to use for a semi-displacement downeast lobster hull?