2 Ideas for boats..

onesea

onesea

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First one is for a foiling motorboat, we all know the foiling moth?
rohan.jpg


The water bike:
What would happen if you made a "boat" Well a canoe like boat with foils underneath. Powered it by 6hp Ultra long shaft outboard. Could it supply enough power to give you a 20-30 knot marine motor bike? Low wash and low fuel consumption?

The sailing boat:
With the success of the skiff type boat in the Transat, is this not the way to go for a trailer sailor. Design for maximum tow-able beam length within tow-able limits but can be shorter and give it bloody great dagger-board (even better lift-able canting keel) with lead on the bottom. Twin rudders baby little outboard, light but powerful rig.
The biggest compromise would be stretching the cabin upwards for as much head room as possible and keeping a light but comfortable accommodation.
Basically an over grown optimist with rounded corners!
Transat%20David%20Raison%20%20winner%20BD_1165_transat_Bahia1D.jpg


Have I missed the boat and are they out there?
 
That Moth is "White Knuckle Express", the boat that Rohan Veal built which started the foiling revolution. Foilers had been built before, but were largely unsuccessful, and usually had a foil system going between the racks. A lot of the stability of the moth comes from the rig, so although a hydrofoil motorbike thingy could work, I suspect it would need a different foil arrangement to the Moth.

A good thought on the scow shaped trailer sailer...however...let's be honest...they are fugly...
 
The boat with a longshaft outboard should be achievable....

(rather pisses me off they introduced a speed limit here as this was one of my project ideas)



 
Now let's see you getting a wonder-foiler up the beach or slipway...

Iain C, yes, FUGLY ! Not much ' row away factor ' there I fear, apart from speeding up the rowing.

In the early 1980's the Sandinavian ' Spaekhugger ' & ' Grinde ' tried this approach.
 
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Well, I'll stand corrected due to Lakey's video...I'm quite surprised that motor boat is as stable as it is...but then again it's narrow and the weight is only ever on the centreline, unlike a Moth.

Vyv, they are quite stable when they are up and foiling. But the tricky bit is getting to that stage in the first place! But they are a complete arse in light, sub foiling conditions...
 
onesea said:
First one is for a foiling motorboat, we all know the foiling moth?


The water bike:
What would happen if you made a "boat" Well a canoe like boat with foils underneath. Powered it by 6hp Ultra long shaft outboard. Could it supply enough power to give you a 20-30 knot marine motor bike? Low wash and low fuel consumption?

Have I missed the boat and are they out there?
Click to expand...

Don't worry, you're only 100 years behind the times! ;)

Forlanini_Idroplano-Forlani_Hydrofoil_1910.jpg
 
flaming said:
Well this exists.

Adding an outboard would seem to be the next logical step...

There's nothing as extreme as 747 (awesome number they got for that boat!) in the production world that I'm aware of - and I believe the concept would struggle unless it's super light displacement.
Click to expand...

Going to have to agree on both those. Sadly I think if the trailer sailer was to work it would end up looking very spartan like a MacGreagor below. With all the interior structure being desgined to supply the strength. The final looks might not be much better, there would be many similarities. But if it supplied a fast (possibly a little extreme) fun affordable boat, designed to sail. Why the hell not?

Lakesailor said:
Bit like this?
Click to expand...

Yup, but using available technology to make it affordable, maybe not as quick but still fun...

Outboard 1.3k Hull could cost peanuts for the initial trials 1k foils? how much? where from?


Lakesailor said:
The boat with a longshaft outboard should be achievable....

(rather pisses me off they introduced a speed limit here as this was one of my project ideas)
Click to expand...

I can see it being a fun project. Once u[p and flying the possibilities are endless think of your inflatbale a little alloy frame and you could have that foiling......
Less wash in anchorages, can it be done for the darkside? 40 foot Mobo's on foils...

Seajet said:
Now let's see you getting a wonder-foiler up the beach or slipway...

Iain C, yes, FUGLY ! Not much ' row away factor ' there I fear, apart from speeding up the rowing.

In the early 1980's the Sandinavian ' Spaekhugger ' & ' Grinde ' tried this approach.
Click to expand...

The foiler would need them to be retractable for shallows etc, hey but initial thoughts are for fun and affordable to run no wash... I have played in RIB's and enjoy them they are fun, but not if I have to pay the fuel bill. Some places like Chitchester Poole with shallows would be a nightmare others where draft is less of an issue it would be fun...

Seajet each to there own when it comes to looks, there are many boats out there with a low row away factor. There is a certain pleasure in owning a boat that is admired.
Then at the same time my pleasure is sailing a boat that sails and sails well, within the practicalities of her design. Affordable, easily rigged, trailer sailer, Light, Fast, Strong, shallow drafted but ugly. Maybe I could live with that...

So what is the maximum beam a boat could have for for towing behind a car in the UK?

LittleSister said:
Don't worry, you're only 100 years behind the times! ;)
Click to expand...

That looks seriously cool, sadly I cannot stream video here....
 
Onesea,

if taking this seriously for a moment one of the problems is how are you going to raise the keel / hydroplanes?

The 'planes might possibly be shaped to conform with the hull when raised, ( and how is the winch for that going to be powered, a hydraulic take-off ? ) but it will mean a big daggerboard sticking up interfering with the kicking strap / vang and probably the boom on a sailing boat or causing obstruction / concussion on a fast mobo.

However dafter things have been proposed, good luck !

http://www.youtube.com/watch?v=6ih_KBru6Co
 
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Not sure that foilers would suit many MoBo drivers... No wash, bumping off waves or dramatics. Bit too smooth and boring. But I might be biased.....

That Mini Transat scow is only a rating dodge. Max length 6.5 mtrs, so a clever way to get round that. If not constrained by length, more attractive ways work better.

Edit:Max towing beam is 2.4 mtrs, after that, you can tilt it or get an escort (any car can do, doesn't have to be a Ford)
 
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DownWest said:
That Mini Transat scow is only a rating dodge. Max length 6.5 mtrs, so a clever way to get round that. If not constrained by length, more attractive ways work better.
Click to expand...

The Mini rule definitely lead to the scow, but there's no question that the design is faster than the pointy boats.

The 38ft 'A' scow they sail on the American lakes has been clocked at 33 knots.

What are the more attractive ways that work better? It seems to me that this has yet to be settled. 747 is faster than the other minis of the same length, how do you know that would not be the case at say, 40ft?
 
mrming said:
The Mini rule definitely lead to the scow, but there's no question that the design is faster than the pointy boats.

The 38ft 'A' scow they sail on the American lakes has been clocked at 33 knots.

What are the more attractive ways that work better? It seems to me that this has yet to be settled. 747 is faster than the other minis of the same length, how do you know that would not be the case at say, 40ft?
Click to expand...

A longer boat would look more conventional/attractive. I don't know about 747 being faster, but certainly completes the course in less time.
DW
 
Seajet said:
if taking this seriously for a moment one of the problems is how are you going to raise the keel / hydroplanes?
Click to expand...

Like the rudder/ daggerboard on a dinghy with a locking pin to hold it down...
If I could find some cheap Foils, I would probably have a go at making something to go with a 3.5hp outboard I already have... Just find an old dinghy/ canoe/ windsurfer at a jumble sail..
 
Can't see a 3.5 hp getting over the hump, as it were. There will be a lot of friction before the hull lifts clear of the water. The foiling speed is surely going to be higher than the hull speed.
 
DownWest said:
Not sure that foilers would suit many MoBo drivers... No wash, bumping off waves or dramatics. Bit too smooth and boring. But I might be biased.....

That Mini Transat scow is only a rating dodge. Max length 6.5 mtrs, so a clever way to get round that. If not constrained by length, more attractive ways work better.

Edit:Max towing beam is 2.4 mtrs, after that, you can tilt it or get an escort (any car can do, doesn't have to be a Ford)
Click to expand...
Point taken about boring for big boat... I still think there could be fun in a small boat..

Agree RE beating racing rules with extreme hull shape but cruising boats have always followed the racing trend. In this case it would give more internal volume for same length...

Thanks for the 2.4m it probably kills the idea to a greater extent. 3m is max beam for a Transat so you would end up with a shorter boat. A slightly more beamy West Wight potter :o

Taking an optomist as about the right proportions for a scow.
LOA (2.36 m) x 2.14 = 5.1m
Beam (1.12 m) x 2.14 = 2.4

As soon as you start stretching the length to get the accommodation space you start heading into Macgregor country :ambivalence:
 
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