The weight per volume of lead is much more in comparison with the same volume of steel. That is the reason to use lead. If you would make the bulb out of steel you would need 1.4 times more volume. The shape is also of big importance. This shape is equivalent of the drag of a round ball the size of a pingpong bal.
nice job, i like c-mon and kypski too. They do a cool mix with the amsterdam klezmer band and yuri someone, 10 minutes of cool music
WHAT IS THE MUSIC??? I ABSOLUTELY LOVE IT!!!
Music
"In & Out Of Days" by C-Mon & Kypski
What if I simply make a steel "profile bulb" (easier and cheaper), will it have so much hydrodynamic difference for a weekender ? (not racing)
The weight per volume of lead is much more in comparison with the same volume of steel. That is the reason to use lead. If you would make the bulb out of steel you would need 1.4 times more volume. The shape is also of big importance. This shape is equivalent of the drag of a round ball the size of a pingpong bal.
you guys should really be wearing masks...
lead fumes are really bad!
But great idea on pre-heating the mold first to avoid thermal shock!
Correct, next time we will do a "pre-pour" fill it half, open the mold, melt the lead again in the preheated mold. Problem solved.
what is the mold made from???????
What the the finished weight of the bulb?
70 kg if I recall correctly
Just Portland cement mix, no extra sand. Just stuff that can stand the heat (You don't need big stones in it like in concrete)
thanks mate. happy sailing and God Bless.
Want to see some professional lead workers?
Search in youtube at
Casting--Making pipes at Bedient Pipe Organ
Castings what is the best material to make a keel with
Event dry cement has a humidity factor.
You have failed to prepare therefore the steam induced a crap finish.
Sand casting would be better
70kg
No good job......fix fix fix