Recent content by SailDesign

I believe it is "Willowee", a Nordic Star Runabout. :) https://www.yachtworld.com/yacht/2006-nordic-star-33-runabout-9925291/

Sadly (or not) that time has passed, and I'm now officially retired and only drawing "bathtub boats" to soothe my soul. I've found that my stupid smart watch's "Body Battery" reading can go UP when I'm playing in 3D. :) When did you last live here? EDIT to add: Thanks for the compliment -...

Tad, you are, as always, a gentleman and a scholar.

We may have been, but all is well now. Don't rock the boat....

All (mostly) true. But the fact remains this is an incredibly popular/fashionable hullform. Personally, I hate modern houses, but it uis what people want, and anyt new designer who doesn't play with the form is shooting themsleves in the foot. PLay with things, see what they do, try things...

Probably very true - go in peace. :)

Hence my use of the term "Effective CG" to mean the combination of actual CG and the centre of lift. If you have never had to calculate the effective centre of lift/gravity in this fashion, then YOU have been very lucky...

TANSL, I'm not making fun of your English - I'm merely pointing out that I may have read it in a way you did not intend. And if this vessel cannot change speed in any direction (this mythical, non-existent vessel that no-one has designed yet) can we not simply give it a Voith-Schneider rotor...

What you SAID was This reads that even +5 to -5 in 22 seconds is not feasible. Which is wrong. I know that English is not your native tongue, and since I know NO Spanish worth mentioning, you are far ahead of me there. However, your post reads as I state above.

< sigh... > Whether 2 seconds or 22 seconds makes the world of difference to the accelerations required. And Gonzo had read the original post and assumed we all knew the 2 seconds requirement. If you feel +50 to -50 mph in 2 seconds is do-able, then please tell the OP how. I'll be...

I have taken them into consideration, but never to the extent of having them affect the static condition overmuch. Congrats if you still do. I take into account the likely speed and use, and tune deadrise (and therefore volume) to suit. But I never really look at the expected movement of...

The OP gave 2 seconds. Do the maths yourself, but I get 2.3g, same as Kerosene.

Well, Duh!, as they say over here. When planing, dynamic lift affects it, and when in displacement mode close too hull speed, there may be enough suction to INcrease the effective displacement. But no-one designs for those cases initially.... Or, since we are being Heinlein's Fair Witnesses...

I'll re-write it... The weight of the displaced water MUST be equal to the weight of the boat. Science says so.

Gonzo (good to see you're still around!) I agree on the first - weights must be calculated properly, or at least estimated properly at this stage. Sentence 2 should read, "The submerged volume WILL be equal to the displaced weight of the water." Hydrostatics define it so. :) I have...