Update on the virus warning in the comments:
I just received a mail from the administrator of the Muskoka seaflea page, and they were attacked heavily about a week ago. They have had it all cleared, so it should be safe now.
Apparently a warning can "hang" in the system until you update your browser?
Quote: "some times the cache on a visitor's browser will hang onto the "warning" until their browsing cache is refreshed"
Thanks to a much better than normal summer (hottest in Denmark in 150 years or so), There might be a real chance of some time spent at the beach.
Gustav has long complained that we haven't got a boat. When I tried to tell him that we could probably get a rowing boat or a small sailing dingy, he looked at me the way only a frustrated teenager can do. The look that clearly tells you that in his opinion you must be living in the 20th century (which happens to be correct for my part)
Sitting out here without a definite woodworking project going on, I started surfing the web for some inspiration. I have always admired those small hydroplanes from the 60'ies. Those on the cover of Popular Mechanics etc. Nice looking cover articles from a time when the western world was pastel coloured - and smoking and drinking was recommended by your local doctor as a perfectly legal way to wind down after a long day at work.
There are a couple of places that has those old designs available as free pdf files for downloading.
I ended up at a place called Muskoka seaflea, they had just the right plan for me.
The incredible Mini Max Hydroplane.
It is made out of two sheets of 1/4" plywood, a bit of regular wood, a little bit of epoxy to seal the edges and that is about it. According to the article, you can build it in two days, or one day if you have some woodworking experience.
Back in the days this little boat could apparently be built for 20$. That figure doesn't quite get you there today, but I have made a loose budget, and I think that I can probably build it for something like 200$. The most expensive stuff being the epoxy and the paint.
We have an old 4 hp outboard engine, and that will have to make do for a start. If it is a success, I might have to look into finding a more powerful motor later on.
I have spent a bit of time figuring out the radius of the curves shown on page 2 of the instructions.
Those old plans can seem a bit vague compared to what is available nowadays, but since they are free you can't really complain. And if it was possible to build one 50 years ago based on those plans - I can't see why we can't do it today.
According to my calculations, the radius of the "fore center strut" is 85.4"
The lower radius of the "fore cross piece" is 86.2"
The upper radius of the "fore cross piece" is 102.1"
We'll have to see if I am correct once I start building the boat.
The plan is off course to get the boys involved. The individual pieces are not very heavy, and today with the possibility of using screws instead of nails, the buys can really play their part.
If all goes as planned, I will be back home Tuesday night, so Wednesday would be a logical starting point with a trip to the lumberyard for some plywood and possibly some screws.
In the free world, it is probably legitimate to let your children play in a speed boat. But guess which country that has regulations for that as well..
But being the less than enthusiastic citizen that I am, I looked that the official page from Søfartsstyrelsen (the Danish equivalent of US Coast Guard) to see if the rules were possible to work around.
The rules state that you have to be 16 and have a speed boat licence if the power of the boat is more than the "square of the length +3".
If the boat is of a planing type and it is shorter than 4 m (~13'), you need to be 16 and have a licence if the engine has more than 19 hp.
So by making a really short hydroplane I elegantly manage to circumvent the regulations, and can let my kids use the boat to their hearts desire. As long as I stay below 19 hp. But given that the design suggests a maximum of 15 hp that shouldn't be a problem.