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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Sailboat without a mast
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Topic Review (Newest First)
01-13-2015 09:36 PM
capta
Re: Sailboat without a mast

I love it; "If one could repower up a bit to have a frankenstein trawler cat that would be efficient at low speed (trawler-like gph) but have some 'umph' when you needed/wished to go faster, too."
Yeah, that's the poor man's way, let's just repower! A couple of BIGGER diesels will probably need bigger shafts, different screws and perhaps even struts.
Never mind that most cats have very narrow engine spaces, and oh, I guess we will need to reinforce the engine beds for the greater horsepower. Of course, adding a few hundred pounds to the stern of any boat, let alone a cat, should really improve performance as well, wouldn't you think?
Repowering with bigger engines to go slow is like buying a shrimp trawler or a tug boat to make long distance voyages; it is never economical.
I love how some people will come on here with a rather impractical idea and abuse those who have a pretty good idea of that impracticality, ignoring some pretty good advice. If I had a buck.......
01-13-2015 09:30 PM
Minnewaska
Re: Sailboat without a mast

I guess this is how it goes. I want to do something stupid, but if you think its stupid, you're stupid.
01-13-2015 08:11 PM
deniseO30
Re: Sailboat without a mast

Quote:
Originally Posted by Digot View Post
Wow. I've been thinking of doing something similar to the OP and read this entire thread with interest. What a waste of time, as most were just critical off-topic replies which wouldn't be much help to the OP. Wherever you are, OP, I hope you are enjoying your boat.

I've wondered about the feasibility of purchasing a 32'-38' sailing catamaran and removing the mast and sails to sell (hopefully offset the purchase cost somewhat). Even used power cats are always so expensive but more older sailing cats to be found more reasonably priced. I realize that power cats have different hulls but the sailing cat sans sails should still be pretty darn efficient and loads of room for a liveaboard. If one could repower up a bit to have a frankenstein trawler cat that would be efficient at low speed (trawler-like gph) but have some 'umph' when you needed/wished to go faster, too. A poor man's power catamaran, so to speak. I wish I knew where to find info on doing something like that. Anyone know of a blog of resource of anyone that has done that or documented attempting?

The OP is gone, I think, so feel free to bash me now instead. Thanks.
feel better now?

You have MY permission to do what you will with any boat you wish to make into a power boat.

It is feasible and very affordable until you try to make them go fast. Most sailboats, even cats have "displacement" type hulls and tend to build dam like wake as they are pushed beyond the theoretical hull speed. Applying more power beyond that makes them churn the water and actually ride lower in their own wake even go slower.

You could get lucky and find some that will plane like some of the high end racing sailboats. but I'm really not an expert on all this. There are some very well qualified naval engineer/ architects here on the forum that could help on that.

I don't think you find much about making sail into power because it's all a very low tech way to make a power boat. Purists won't be much help. Motor sailers, even some trawlers have sails to compliment the power of the vessel, and to not have that available is a real loss in the vessel's actual design. Power boats do go better with power; Just the way things have evolved in boat design. Sails and wind pressure (there is a formula) can be converted to horsepower AND it's amazing how much power sails really do develop! It's way way beyond what just a motor can do because "lift" is also part of the equation.

"motor sailing" (Usually jib deployed and motor running) a method many of us use to make way in good time. This can't be done if the "new" boat is without sails, end result; it will motor slower then if it were "motor sailing"

This "make a sail boat a power boat" really is nothing new as some people just never bothered to raise the mast and or sails.

ps I only really read what you just posted.
01-13-2015 03:02 PM
Digot
Re: Sailboat without a mast

Quote:
Originally Posted by white74 View Post
should think canal boat instead of repurposed sailboat
Wow. More of the same. Thanks a bunch.

Never mind. I found another forum about converting sail cats to power cats was being discussed. And people actually read before replying! I marvel!! Bye.
01-13-2015 02:48 PM
white74
Re: Sailboat without a mast

should think canal boat instead of repurposed sailboat
01-13-2015 02:40 PM
Digot
Re: Sailboat without a mast

Wow. I've been thinking of doing something similar to the OP and read this entire thread with interest. What a waste of time, as most were just critical off-topic replies which wouldn't be much help to the OP. Wherever you are, OP, I hope you are enjoying your boat.

I've wondered about the feasibility of purchasing a 32'-38' sailing catamaran and removing the mast and sails to sell (hopefully offset the purchase cost somewhat). Even used power cats are always so expensive but more older sailing cats to be found more reasonably priced. I realize that power cats have different hulls but the sailing cat sans sails should still be pretty darn efficient and loads of room for a liveaboard. If one could repower up a bit to have a frankenstein trawler cat that would be efficient at low speed (trawler-like gph) but have some 'umph' when you needed/wished to go faster, too. A poor man's power catamaran, so to speak. I wish I knew where to find info on doing something like that. Anyone know of a blog of resource of anyone that has done that or documented attempting?

The OP is gone, I think, so feel free to bash me now instead. Thanks.
08-17-2014 01:01 PM
socal c25
Re: Sailboat without a mast

Geeeze another OLD POST dug up...
08-17-2014 12:56 PM
TQA
Re: Sailboat without a mast

First of all running around at sea with no mast is no problem ON THE GREAT LOOP! Sure when you get an ocean swell causing the boat to roll the roll will period will be less due to the loss of pendulum weight. How often will that be.

10 ft mast say an old windsurfer mast will do just fine and can be left unstayed and dropped easily if required.

A sailboat will be more economical than a trawler.

One thing I might do is add some pitch to the prop to get closer to cruising speed at max torque as fuel burn will be reduced.

Seems a reasonable idea and maybe the mast etc could be sold?
08-16-2014 11:32 PM
rgscpat
Re: Sailboat without a mast

The Macgregor bashers risk sounding a bit silly or uninformed if they assume ALL Macs sail the same. There was quite a lot of design variation throughout the Venture-Mac build history.
08-16-2014 06:39 PM
smurphny
Re: Sailboat without a mast

Quote:
Originally Posted by k_p_m View Post
I too am curious what peoples burn rates really are. I know thats not the point of sailing, but some of you guys must keep track?
I average around 9.5 NM/gal. diesel. 35' full keel, Yanmar 3GM30F. 29 Hp. Hull speed is 6.4 knots. I usually run at 2600-2800 RPM.
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