The Great $80 RC Submarine Challenge!

[Subculture]

I don't think that counts as variable displacement, it's still a form of dynamic diver, albeit using a thruster rather than flow over the hydroplanes and hull.

In fairness there currently exists a number of models out there that can get you into this hobby very cheaply. In less developed economies even those low costs can be prohibitive, but not in countries like the USA.

I think the main problem lies is in skill set and underpinning knowledge. Even with technologies like 3d printing and pre-moulded parts, anyone engaging in this hobby needs a decent understanding of limits and fits, correct use of adhesives and reasonable dexterity with hand tools, cutting, filing, drilling etc.

[redboat219]

How about using vertical thruster in lieu of ballast tanks to dive?

[Schmitty1944]

I'm in.

Jason

[Nathan]

I have a design in mind. Static diving and all.

[Subculture]

Perhaps we should get a show of hands of those who will be participating?

I'll throw my hat in if dynamic divers are included.

[Schmitty1944]

I think this contest needs an impartial judge/mediator who can decide some of these questions and whom can be consulted with regarding acceptability of builders choices.

This Judge could also take certain factors into account when they pick a winner such as whether the builder scratch built everything or used a $1000+ 3-D Printer or CNC machine etc. I have someone in mind, but I don't know if they might want to be in the contest and I can not mention their name.....

Jason

[Subculture]

Regarding materials, are costs going to be calculated pro rata?

Many parts have to be purchased in minimum quantities often in excess of which is required for a single build, leaving parts left over for other projects e.g. pipe, connectors, wiring, linkages, resin, seals etc.

Will all parts have to be new, or can secondhand/used/scrap material items be incorporated?

Also inclusion of a ballast system is simple enough, however seems somewhat restrictive if the original boat didn't have one, and dynamic divers can be just as much fun as static divers.


Final point, will designs have to original e.g. no use of others STL's/3d cad or pre-made hulls.

[Nathan]

Does the 60 days include ordering and shipping or can (and should!) we start that now?

[redboat219]

Why not? They're part of the sub, and a vital one at that...

Think disposable batteries like alkalines, $1 per piece. 5-6 pieces of AA batteries to make 7.4v.
The sub only has to travel 30ft. 15 ft forward turn then travel back 15ft.
To conserve power ballast venting needs to be passive. Ballast blowing can either be thru water pump or snort/ low pressure blower. Gas like Propel would be least power hungry. Limit to 1-2 blows

[RCSubGuy]

Good question! Should not

Why not? They're part of the sub, and a vital one at that...

[biggsgolf]

Do batteries count as part of the build materials?

Good question! Should not

[Fishb0y]

Do batteries count as part of the build materials?

[redboat219]

plastic model kits like Trumpeter Seawolf or PVC pipe for hull/ wtc with plastic easter egg halves for the bow and stern cone.

[TuptubBuilder]

Can I start with a 20 USD Tamiya Blowfish?

[Subculture]

Perhaps consider bonus points for those substantially coming under budget?

3d printed hulls fair enough, but perhaps not the first thing available to someone on a tight budget (build a cheap sub, but first buy this $200-300 machine....). Perhaps cost for printed hull could more accurately be reflected by bureau rates, realistically $20+.