KVARK – the homebuilt microcruiser

Aprils first pictureless post – today we added the third plank to the boat (!), laminated the rudder and continued on the aft shelves. Two planks a day is achievable, so in theory we need three to four days to finish planking. But, but before that we need to install windows, complete the aft shelving and test out the inside cabin steering system. Joosep ordered some Sikaflex for the windows, which are going to be made of 8 mm polycarbonate UV-proof glass, which we have bought already. Rudder hinges need to be made too. So – pictures next week!

Hoi!

I thought I’d share some information on DIY rudder hardware. We have decided to build our own hardware, since the width of our rudder sets a higher price range for market pintles and gudgeons. We are going to use 4 mm thick AISI316L stainless steel.  Here is a list of material properties:

Source: European Space Agency

So, our dealer said that this stainless/acid resistant steel is less prone to rusting after welding than other steels they deliver. We take their word, since some welding has to be done on the rudder pintle.

www.weldingtipsandtricks.com, in my opinion, is the best source of information for ALL welding applications. Here is an overview video on various stainless steels properties and some welding knowhow. Turns out that welding stainless so that it remains stainless takes practice. Oh, yes, before I forget, here is the video: Metals and Properties of Stainless Steels. And if you want general welding information, oh say when welding a steel sailboat, then refer to www.svseeker.com. Doug Jackson, building a 70 ft. steel origami sailboat, has uploaded a ton of good newbie-friendly information on welding on the page. Well, cheers, on friday we go metal shopping.

Our inspiration for rudder hardware comes from the Duckwors magazine:

Extra heavy duty stainless rudder gudgeon, RL-690-X.

We finished work with the boat about two hours ago. Three last days were rather intense building, to the effect that we dreamed about epoxy, wood and paint. Long list short: seats installed and seat lockers painted, stringers beveled and taken off for easy access to the interior, started construction of shelves and the rudder, completed two watertight compartments with inspection hatches. Of course there are also the little things, such as filleting, glassing, drinking coffee at the shop, discussing plans and all that which takes time.