Colvic Seaworker 22

T

tug57

New Member
Joined
29 Oct 2020
Messages
18
Visit site
Hello everyone newbie here, but not as far as boats or the sea are concerned 18 years in the M/N.

I am thinking of buying a Colvic Seaworker 22 for sea fishing with my son and Grandson. The boat I am looking at as a cruising speed of 8-10 knots as a 3.8 BMC engine 80hp. Cab this boat be converted with another engine to produce at least 15-18 knots.
Thank you
 

Attachments

  • colvic 22.jpg
    colvic 22.jpg
    55.1 KB · Views: 32
The cruising figure you quote seems already quite fast for a boat of this length, if you use the standard formula for calculating the attainable hull speed of a vessel: velocity in knots = 1.35 x the square root of the waterline length in feet.
Increasing the engine size may well just result in the same speed but with an engine just operating at very low revs which is not very good for it's life expectancy.
You will also have to consider the expense of changing the propeller and shaft. You may well produce enough power at high revs to make the bow "climb" the bow wave, but the stern "digs in" producing enough drag to prevent a further increase in speed, resulting in a small increase in speed at the cost of a massive increase in fuel consumption. You may well find more information on the mobo forum, perhaps even a link to an owners association.
Some info on Hull Speed; Hull speed - Wikipedia
Links to previous threads on this forum regarding the marque:
colvic seaworker 22
Colvic Seaworker 22.
 
Spirit (of Glenans) said:
The cruising figure you quote seems already quite fast for a boat of this length, if you use the standard formula for calculating the attainable hull speed of a vessel: velocity in knots = 1.35 x the square root of the waterline length in feet.
Increasing the engine size may well just result in the same speed but with an engine just operating at very low revs which is not very good for it's life expectancy.
You will also have to consider the expense of changing the propeller and shaft. You may well produce enough power at high revs to make the bow "climb" the bow wave, but the stern "digs in" producing enough drag to prevent a further increase in speed, resulting in a small increase in speed at the cost of a massive increase in fuel consumption. You may well find more information on the mobo forum, perhaps even a link to an owners association.
Some info on Hull Speed; Hull speed - Wikipedia
Links to previous threads on this forum regarding the marque:
colvic seaworker 22
Colvic Seaworker 22.
Click to expand...
Thats seems to have sorted it, I thought maybe trim tabs and a bit more power? Thanks for your reply
 
I've been through this this year.

Possibly, it depends if it is the earlier or later hull. The later hull is flatter aft, has less of a keel and has a small chine or spray rail around the waterline mark. Normally these have outdrives and with them will do what you want.

By the time you have bought the boat (if it is later) and re-engined you might find that it would be better to get a Channel Islands 22
 
Spirit (of Glenans) said:
Looks like it has an outdrive. The stern is not digging in.
Click to expand...

Or he has trim tabs fully down. I'm guessing that's still only 10 knots with what I imagine is a lot of power and fuel.

Mind you i've just looked at his other videos and they include him pulling his own tooth out and recording his farts.
 
Ah well I might just opt for the little bit longer to get out there and fish with room and a bit of comfort, thanks for everyone`s input, always good to have other opinions, and advice.
 
I'd try and try before you buy. I looked at four and one of the things that put me off was the noise. I'm sure they can be soundproofed but you have a big lump thrumming away in a box right next to your elbow. having said that I think they are great.
 
You must log in or register to reply here.

Share this page

Top