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Wommasehn

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Wommasehn last won the day on November 16 2020

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    Tübingen, Germany
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  1. Hi Chick, this looks really cute! Would you like, telling us a bit more about these mini-boats ? where and for what you plan to use them, what kind of motor etc? Stay healthy Tobias
  2. Slowly I'm getting on....... As for my initial question, the lateral form, I decided to give it a moderate elliptical shape. The additional area is in the lower half at the trailing edge. To compensate for the larger area aft, I put the semi circle (which is inside the rudder-head and includes the pivot) a little aft too. The result is that most of the rudder moves a tad forward , thus providing a little more balance. I hope that the sailing characteristics will remain the same all in all - apart from improved rudder-bite when heeled. Then I glued the two half-blanks together. When I took off the clamps, I found that the whole thing was bent....... Having done the necessary cursing, I did a lot more of shaping the profile plus straightening the whole thing, mostly by hand-planing, until it looked/felt good enough. I used a negative template for the NACA-profile. For attaching the haul up , I made a tag of copper and rivetet it to the trailing edge. Here is the dry fit with the old blade for comparison. (For whatever reason, I still can't fit a picture inside the text) Meanwhile, I epoxied and glassed the whole thing and put on two coats of primer. So its mostly ready.
  3. Peter, thanks for your reply and thoughts. As for the material, I had thought about that , but decided otherwise because building with solid staves is much more time consuming - and time is crucial for me ( I have to work a real lot). And then the old rudder blade had lasted for some 25 years, made of plywood and not glassed. So I hope that the new one will have sufficient strength when I glass it over and make a more gradual transition from the rectangular section which is inside the rudder head to the profiled main part which gets immersed. Thus creating less of a weak spot (where the old blade has broken as you can see on the photo). Cheers Tobias
  4. Hi everybody, Muckla needs a new rudder blade, the old one broke on my autumn-cruise (maybe I'll write down how and post it in the Boating and Cruising Stories). I bought marine ply and started building the new blade. Now that I've got to do that, I'd like to make a better one. This means a stronger onde above all - but at times, when she heeled, the old rudder lost its bite. I don't like to have a longer blade as this would give more leverage and thus a higher risk of braking again - but I think, it should have a greater area towards the lower end. As for the profile, I have setteled for NACA 0012 and even started ro route my half-blanks to that profile (see pic). But I am unsure about the shape (sidewise-view). The old blade has this elliptical shape which is said to have little drag. Any ideas about how much more drag I might get when I make a fatter ellipse or even a straight downward side like on the Lasers appendages? I recall having read a contribution of the late PAR about that, stating that the elliptical shape would'nt be that much better - but I can't find it any more. So who knows more??
  5. hi Sanmi, my boat is a 20 ft centerboarder with a small cabin. In case you want further information: I wrote more about her in the main forum in Jan. 2019. The extension cable comes only in 2 meter-lengths. First I bought one which allowed to stow the battery under the side deck near the forward end of the cockpit. Better than above the transom but I was'nt completely happy with that. So I bought another 2 m and now I keep it in the cabin, There is a doubble-berth going from side to side and the battery sits under that on top of the keelson, thus contributing to the ballast. The Epropulsion-battery is in fact easy to install (I think, its quite similar to Torqueedo), so keeping it at some convenient place and putting it on if necessary seems quite sensible to me.
  6. for my Epropulsion spirit, I bought an extension to move the battery and it’s weight more forward & downward. This works well - but a special cable with special connections is required and they are disgustingly expensive. As I definitely wanted to move that weight and didn’t dare to extend those nine pin cables myself, I dug into my wallet.... All in all, I‘m quite happy with the electric OB even though it has lately let me down due to a loose connection (which after all was my own fault)
  7. I may be late on this topic. Some time ago, I asked about using pure citric acid for cleaning epoxy. From the replies then, I gathered that it hasn’t been tried by many. So I gave it a go. Works fine for me, doesn’t stink and it’s cheaply available - here at least. It comes as a powder to be mixed with water. No idea if it penetrates the skin but it is definitely easy to wash away.
  8. Glad that it didnt turn out worse and glad you shared this story. This about forgetting things: When I bought Muckla, my Diabolo, in 2009, she was in the water. I had a cold but sunny week of autumn cruising on Chiemsee in her before I took her out of the water and brought her home. So pulling her out, unrigging and trailering was all new to me. I was amazed, how hard it was to winch her on the trailer until I heared a crack and realized that I had forgotten to hoist the CB up. So the first repair was due to stupidity. Lesson learned, I thought - until it happened again this year.... Mucklas CB does have a downhaul, which I reguarly forget to uncleat when I should. I am not shure if this could prevent the CB from falling back and damaging the CB-trunk if she really capsized - but that's the reason why I always cleat it. I hope, I can never report if it does.
  9. I have the same motor (only a smaller battery) and I am quite happy with it for my 20 footer. Epropulsion as well as Torqueedo both sell a smaller version which might be sufficient for the Spindrift
  10. thanks Chick for reminding me. Read yesterday and enjoyed it very much. Please give my regards to the Old Codger who seems to be quite young at heart - in spite of his name. Maybe like his creator and maybe like most of us??? My dear wife at least was a bit surprised to hear that others speak with- and about their boats like that too ( she herself is a master in wording our dog’s thoughts though)
  11. I have seen it - and it looks really great. Congratulations to your umpteenth build!
  12. I agree with everything said in these posts. Only as for the vac I‘m ambivalent as it’s a nuisance for me. But dust is a nuisance too - and an unhealthy one. So you got to find some kind of balance between them. I love especially my vintage hand tools. As for planers, you certainly don’t need to copy my collection..... But apart from a good standard block plane, I strongly recommend the tiny pocket planer in the foreground. It’s not only cute but really very versatile. One of the things you often use, once you own them
  13. well, I have to admit that I did‘nt try this. I‘m only thinking/fantasizing. And this is what comes to mind: If it’s badly damaged, you can pull it off or grind /sand the remains away. If it is not badly damaged, you can leave it as it is - or give it a coat of epoxy - or patch it up with some similar stuff. No big deal in any case. Of course, some metal strip would be much more durable. But also much more work and cost. And the problem of how to fasten it - as this thread shows.
  14. why not the „Rope Trick“ or maybe modified as a „webbing trick“ , that‘s some hefty strap soaked in epoxy? Should be easily replaceable if necessary.
  15. Meanwhile, it occured to me that 1/2 throttle might mean different things: I understood it as half power, that's the 500 W. If someone means "half speed", that's with Muckla 2.5 kts or something like 200 W only. Counting like this, you will get a lot more range....
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