If you look at the bottom of that graphic where it has "*tested with 200lb load in quiet water" And that is a 7.5' boat.
So how much does your dinghy weigh? How much do you weigh? How much does your batteries weigh? Other things on the boats weight?If there is a head wind or waves, this will also require more power to plane.
The other big factor is hull shape. And most likely your dinghies hull shape is not optimal.
They probably did there test, with a very light 7.5' plywood boat, with a 100lb person, and small battery.
On Mon, Nov 28, 2016 at 1:14 PM, bruce thomas mosslandingcreatures@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:
Maybe I should buy the 86 pound who's specifications call out at: 13.67 mph on a 10 to 13 foot boat.. Then I'll report back to you what the actual boat speed is...I'll let you know how fast my boat is then actually going...and if it's going 13mph....then maybe we can figure it out ourselves how they do it? I agree my old Minn-Kota C2 spec says "boat speed will always be fixed no mater what motor you buy" So something has to be special about the Newport Vessels.BruceSent from my iPad
On Nov 28, 2016, at 2:24 PM, Bob Caulk bob_caulk@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote: There have been discussions on here in years past which indicated that trolling motor propellers are usually designed to max out at about 4 mph no matter how light the boat or how much thrust the motor can generate. Some folks were experimenting with model airplane props, I think. If the Newport Vessel motor/prop can really develop those speeds I would be impressed, and it must have something other than a normal trolling prop. You might check the archives from the past, my memory isn't that great.
From: "63urban 63urban@gmail.com [electricboats]" <electricboats@yahoogroups.com>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com >
Sent: Monday, November 28, 2016 12:42 PM
Subject: Re: [Electric Boats] Re: Newport Vessel trolling motors spec sheet
I have no doubt that the motor could get your rib to that speed but it may need a different prop. my hobie mirage tandem island 20' and loaded to about 650 lbs will do about 4mph with a 50 lb minkota with no stress at all. I am quite sure that with a different prop I could get about 6 to 10 with out loading the motor but nobody makes such a prop so I guess I need to figure it out myself.NickSent from my Bell Samsung device over Canada's largest network.
-------- Original message --------
From: "bruce thomas mosslandingcreatures@gmail.com [electricboats]" <electricboats@yahoogroups.com>
Date: 2016-11-28 6:33 AM (GMT-05:00)
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Re: Newport Vessel trolling motors spec sheet
Ah yes simplicity. Has anyone looked at the Newport Vessel (trolling motors) website? There is a light and dark blue chart that shows what you can expect in hull speed with each model offered? When I ask them are they doing it with pitch, diameter, or RPM they told me they really couldn't say. They go from the 36 pound thrust that will push an 8.8 foot boat at 4.04 mph to an 86 pound that advertises a hull speed of 13.67 mph for a 13.8 foot boat ! There is even a video beneath the chart showing showing an inflatable being pushed thru the water at different speeds. High speed looks pretty fast! I currently have two 135 ah batteries ahead of my 40 pound Newport Vessel motor on my powered rowboat that runs my boat at around 4 knots and am interested in upgrading to the 86 lb to TRIPLE my hull speed. Can anyone help to explain to me how approximately doubling thrust to 86 lbs will triple my hull speed? Has anyone read the chart? Am I misinterpreting it? I would be extatic if my 9 foot RIB rowboat could go 13 mph with an 86 pound Newport Vessel trolling motor ! Let me know what you think. I am about to buy an 86 pound from them but thought I would ask you all first.BruceSent from my iPad
On Nov 27, 2016, at 5:06 PM, John Acord jcacord@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote: John AHalf the fun of electric boating is what you can do simple. :-)What ever happened to good simple instrumentation?Most anything you want to know about your system can be done with sensors and minimal electronics. There is a lot of stuff out there for things like the Pi that are excellent building blocks. (Didn't someone on the list said you can easily read canbus with a Pi?)
Thermal sensors, rotational sensors, shunts and voltmeters can tell you most of what you need to know about your system.
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Posted by: Kev <captainyoung@gmail.com>
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