Titan 33" with twin screws???

[mschaffer66]

So I've got this Titan hull kicking around and right now I'm contemplating doing twins in it. My thought is:

Turnigy 180A ESCs
Leopard 4074 2000kv motors
4S2P
Speedmaster stinger, rudder, turn fins, etc...
No clue on prop size yet, but something counter rotating for sure.

What does that sound like to you guys? Not enough? Too much KV?

I figured 2000kv at 4S gives me like 29600 rpms and I've heard that 30000 is the magic number.

I figured I would run 2 4S 40C 5000mah packs in parallel then to each esc to ensure each esc sees the same voltage at all times and each back gets the same draw.

What other suggestions would you guys have for this setup?

[mschaffer66]

Hmm..no input...

This idea is either incredibly stupid, incredibly boring, or so damn groundbreaking no one dare touch it :) I'm thinking a combo of stupid and boring lol

[Chilli]

I have no experience with twin screws. Every once in a while someone throws out the idea of a twin mono. Most dont think it will work, but a few have said otherwise. My gut feeling is the Titan 33 is a deep vee hull with allot of lift and I think you'll have a hard time keeping the props in the water once you get her up to speed. The good news is its a great sport hull that handles well and is allot of fun to drive. More than a few of us race them also.

[D. Newland]

The above post is correct...it will mostly blow out the outside prop in the turns.

But, I've been bitten by the twin bug before, too, and the only cure is to actually build one.

[mschaffer66]

Ahhh....so I should just be looking into a solid single motor setup and run with it.

I had figured twins counter rotating would make it more stable at higher speeds

[Steven Vaccaro]

One idea that was floated out there was a single motor running two drives. If both props spun from a common source, there would be no blowout. It sounded feasible.

[D. Newland]

The Titan 33 is a nationally competitive hull in P mono and P Offshore. Just build a single drive and focus on a quality motor and ESC. You won't regret it.

[04DarkShadowGT]

Hmm..no input...

This idea is either incredibly stupid, incredibly boring, or so damn groundbreaking no one dare touch it :) I'm thinking a combo of stupid and boring lol

Stupid and boring pretty much sums it up :)

[mschaffer66]

Motor selection is still kinda up in the air so I can work on that. ESC will be the Turnigy 180A because I have an extra one sitting on the bench.

What motor should I be running in this thing? and what kind of speeds would I expect on 4S?

Keep in mind I'm not racing it and have no desire to race it. I've beat up my share of cars racing, the last thing I need is to crush a little fiberglass box containing hundreds of dollars of electronics :) I'm just a guy screwin around at the lake :)

[Brushless55]

Hmm..no input...

This idea is either incredibly stupid, incredibly boring, or so damn groundbreaking no one dare touch it :) I'm thinking a combo of stupid and boring lol

no way man
someone on here has done a twin mono with great results

[obrien008]

Newland "The above post is correct...it will mostly blow out the outside prop in the turns."

You know that for a fact???

My Twin DF 33 runs perfect, twin 540Ls 2000KV on 5s1p at almost 40k rpms, no blow out at all. Turns better then my single monos and watt meters show almost identical draw from each side regardless of the run.

Check my thread,
http://forums.offshoreelectrics.com/...a+force&page=2

Funnest boat to drive that I have especially on some chop. Got a few more videos that ill put up for you to check out.

Good looking out brushless

[Chris Harris]

It can work but you need to run the drives as close together as possible so running smaller props would help, not the 45mm-47mm that seems to be
the norm on this size boat. This would mean maybe a little higher Kv motors.

I have seen an FE mono setup with twins where the outside drive would rev up higher in the turns but not completely blow out. It wasn't real effecient in the turns but honked down the straights. The drives on this boat were placed a little too far apart but it was cool.

Chris

[Rumdog]

It will still run better with the proper single drive.

[TotalPackage]

Its gonna all depend on where the struts are in relation to the strakes if there are any it seems the struts need to be a least the level or just slightly above the keel.And go with low to medium lift props. RUMMY when am I gonna get to see the elam?Oh i almost forgot different hulls react diferently. Does the boat have strakes tha come all the way back to the transom?When you set up a twin you really need to know what you are doing.Too much lift? Remove some strake. Most new hulls have very little strake thas why they run so good an stable under high power.

[Brushless55]

Newland "The above post is correct...it will mostly blow out the outside prop in the turns."

You know that for a fact???

My Twin DF 33 runs perfect, twin 540Ls 2000KV on 5s1p at almost 40k rpms, no blow out at all. Turns better then my single monos and watt meters show almost identical draw from each side regardless of the run.

Check my thread,
http://forums.offshoreelectrics.com/...a+force&page=2

Funnest boat to drive that I have especially on some chop. Got a few more videos that ill put up for you to check out.

Good looking out brushless

I would love to see more vids of your twin man