Evolution

[redboat219]

What's the next evolutionary step we can expect for RC sub:)?

[He Who Shall Not Be Named]

What's the next evolutionary step we can expect for RC sub:)?

A SubDriver cylinder which can change its own displacement (expand and shrink), making it an intrinsic part of the ballast sub-system. Think: SubDriver devices within a big syringe.

David,

[toppack]

A SubDriver cylinder which can change its own displacement (expand and shrink), making it an intrinsic part of the ballast sub-system. Think: SubDriver devices within a big syringe.

David,

What would be used to move the plunger/diaphragm in/out? pneumatic or hydraulic cylinder or the Midget riding inside with his scuba gear on? :D LOL
Or has that detail not been worked out yet? ;)

[Subculture]

I thought you pretty much had that with the screw jack on the 3.5" wtc's?

[redboat219]

A SubDriver cylinder which can change its own displacement (expand and shrink), making it an intrinsic part of the ballast sub-system. Think: SubDriver devices within a big syringe.

David,

maybe you can utilize something like this;

http://www.noc.soton.ac.uk/JRD/HYDRO/argo/design.php

To control the buoyancy of the float, a small amount of oil is contained within the float. When the float is submerged, all of the oil is kept entirely within the hull. When it is time to rise to the surface, the oil is pumped into an external rubber bladder that expands. Since the weight of the float does not change but its volume increases when the bladder expands, the float becomes more buoyant and floats to the surface. Similarly, when the float is on the surface and it is time to submerge, the oil is withdrawn from the bladder into the hull of the float and the buoyancy decreases.

[He Who Shall Not Be Named]

maybe you can utilize something like this;

http://www.noc.soton.ac.uk/JRD/HYDRO/argo/design.php

To control the buoyancy of the float, a small amount of oil is contained within the float. When the float is submerged, all of the oil is kept entirely within the hull. When it is time to rise to the surface, the oil is pumped into an external rubber bladder that expands. Since the weight of the float does not change but its volume increases when the bladder expands, the float becomes more buoyant and floats to the surface. Similarly, when the float is on the surface and it is time to submerge, the oil is withdrawn from the bladder into the hull of the float and the buoyancy decreases.

Trouble is this: the oil is incompressible -- you have the difficulty of an RCABS system plus the inability to compress the agent of bladder inflation into the 'dry' space of the cylinder. No go. That inflated bladder represents a very small fraction of total cylinder displacement.

My idea is to simply change the volume/displacement of the cylinder itself.

David,

[redboat219]

something like what this uses;

http://graysubs.tripod.com/ams1987/association_of_model_submariners.htm

[He Who Shall Not Be Named]

something like what this uses;
http://graysubs.tripod.com/ams1987/a...ubmariners.htm

Good find, an interesting article and some very slick engineering there.

Close.

Think two or more telescoping sections of Lexan or other such material.

David,

[Slats]

David I like it.
Would such a system be power hungry - high current draw?
J

[He Who Shall Not Be Named]

David I like it.
Would such a system be power hungry - high current draw?
J

Yeah, same deal as the Engle pump/piston: seal friction.

David,

[Rick Teskey]

variable displacement

would a "bellows" type of affair do the trick?
Rick

[Slats]

Good find, an interesting article and some very slick engineering there.

Close.

Think two or more telescoping sections of Lexan or other such material.

David,

Just wondering if you had got any further with this David.
This would be so neat in as a 3.5" SD - perhaps for the HMK Permit?

J