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Kataraman (with impeller) - spiral vase printable

by wersy Dec 20, 2013
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Can you share the impeller design?


I am very sorry but I don't have the files anymore.
At that time I published the boat I didn't thought that anybody would be interested in the impeller - and nobody did until now.
If you would have asked me three years ago I surely could have upload the files.

Am going to try printing top down instead, I think that would be better way to print and stronger, may be not in Vars mode, may take the design and make some changes to try in a competition. Hope you don't mind Wersy.

Thank you for your advice. But in this scale there is no need to make it stronger. Even my bigger boats are strong enough for realy speed.
If you print a boat upside down, you need support and the hull must be thicker for overlapping in critical areas. Furthermore the surface will not be smooth, you will get a lot of rills, especially on horizontal surfaces.
Printing in spiral vase mode is the best way to get almost perfect surfaces und keep it light for best speed.

Thanks for the advice wersy,
My printer had a height limitation and the boat will be very small if print upright, but I will try one unit, and hope will get a good result.

How about if you split the hull in half and scale up each part as much as you can print. Then split out a section where the two parts come together and scale it down so it fits, at least partly, inside the hull to align and glue the two parts together?
This interface part is of course to print in spiral vase mode too.

May try that also, Thanks

In this case, the boat could even be printed upside down because the sides are very steep. Only the bow is a little rounded what may cause some rills. It will go better with two perimeters.

You would likely have better directional stability on the little boat by simply adding a fin on the bottom. Pretty much every boat made has some kind of keel to add that very stability. Cats are stable for that reason too. Figure that the two hulls are essentially big fins.

Yes, you are absolutely right.

I just printed a propeller for the water and add a rudder at the aft for the boat. That should make it faster and a little more directional stable - as I hope ;-) and maybe we even add RC.