Here's a nice little Sub-driver

[Kazzer]

BRAND NEW!!!!
With an approximate length of 3", the ballast tank is designed for the smaller model and a 6" Engine room, this 3" Sub-driver has a lot. 3 Servos, Klik-ons, Dog-bone connector, Mtroniks ESC, and gas ballast system. Ideal for a pool operation. Batteries are housed in the engine room.

All you need is the receiver and Angle Keeper. All wired up and almost RTR.

$275

Of course, I've got the damned ballast tank upside down! I'm not taking another picture - Sheeesh!

[Kazzer]

2 Skipjack Sub-drivers

Almost new, sporting a 400 Graupner motor and a gas ballast system, this is a really good deal at $200.The ballast system servo is installed with operational vent valve. There is a through tube to connect the battery to the engine room. HWSNBN marked these two babies SKIPJACK!

Needs a receiver, servos, push rods, Angle Keeper and a spare half an hour to get it going!

[Warpatroller]

What is the diameter of the 2 "Skipjack" cylinders you posted?

I am assuming wall thickness is about 1/8"..

Looks like 5.5" ballast tanks, with overall length of 17.5"..

[Kazzer]

2.5" diameter

[Warpatroller]

Are those the fore runners to the 1/96 2.5" SAS 20.25" Skipjack Sub-Drivers? Your product specs show the 2.5" SAS 20.25" as having 1/16" wall thickness. Are the older 2.5" units shown above 1/16" or 1/8" wall thickness? I ask because it makes a difference in ballast tank capacity.