!/144 Trumpeter Kilo help

[Bellboy1]

Thank you! I will drill and tap the hub for a set screw. I did not think about coming in perpendicular to the hub, but it seems obvious now that you pointed it out! I figured there was something I was overlooking. .

[He Who Shall Not Be Named]

Thank you! I will drill and tap for a set screw on the kilo. I didn't think about going in perpendicular to the hub.

[redboat219]

Set screw? I just CAed mine together. First attached the vortex attenuator to the end of the 1/16 shaft followed by the main propeller hub.

Prop coated with epoxy primer. Will be sanded smooth.

[Sodamaexchen]

after i have not found the answer with google..... whats the volume of the ballast tank ?

[redboat219]

after i have not found the answer with google..... whats the volume of the ballast tank ?

To determine the volume of the ballast tank needed for a particular boat you must determine the weight of all the structures that are above the waterline when it is surfaces. For the Trumpeter Kilo this is easy because the hull is divided at the waterline.

Water has a density of 1gm per milliliter meaning 10 ml of water weighs 10gms. Styrene has a specific gravity which is more or less equal to water which is 1.


Weight of hull = weight of water
weight water = volume of water
volume of water = volume of ballast tank.

[Sodamaexchen]

Thanks for the reply and the detailed answer.

Maybe i should have written why i am asking.
I know how to determine the volume if i have the model.
But i wanted to do some engineering before ordering the parts and as you already build the boat i thougt you could give an answer like: approx. XX ml

[redboat219]

Approximately CXV ml

[Sodamaexchen]

Thanks !

My guess was around 100 ml, so i got close to a good number.

[redboat219]

found this in Caswell's old site using Wayback Machine.

[Sodamaexchen]

Thanks again!
also for bringing the wayback machine into play, it is such a powerful tool for researching old stuff.