Stable 180 km/h build

[Iquentos123]

Hi, I wondered if it would be possible to build a catamaran that goes 180+ that I can drive on the regular. And for longer periods of time, not just one pass then it needs to cool off. If this is possible do you have any setup ideas or recommendations for me?

[LibertyMKiii]

If the water is too warm you could run a micro water pump, nitro tank - filled with ice water.
This would also reduce the water pick up drag helping with speed and efficiency.

[DannyB.]

180km/h for bashing around...
That's not gonna work...

Those speeds put so much stress on everything your limited to single passes with cool down in between.
Realistic speeds with a setup that's able to run a full battery charge without cool downs would be around 130~140km/h.

A TFL Zonda with a couple of 4082~4092 and some 40~45mm 1.9P props would be doable.

[Iquentos123]

Well yea, was thinking that might have been a little bit ambitious.

The oxidean marine boat does 109MPH for bashing right? Why couldn't I realistically make something with equal performance? I am sure my knowledge is lacking and that it isn't as simple as I stated it above, so can you inform me as of why this doesn't work or rather where my knowledge is lacking?

[DannyB.]

I doubt that 109mp/h would be for bashing....

The amp draw for those speeds is the biggest problem.
Even lipo's aren't capable of sustaining 150~200A loads for minutes on end without major heating of the cells , that's why it's always single/double passes with those speeds. Let alone stuff like the motors or esc's.

[koen]

you can built a cat that can do 120mph but only for max 2 runs (you have to use lehner motors and they are not cheap)and for some more run time 80mph,but long run times is not possible.For those speeds the best hull is from MHZ a 114 or 135 and you need the very best lipo's ,it's expensive but it looks so good

[DannyB.]

From about 60mph and up everything starts to heat up at an exponential rate , drag is a bitch...
You can get a boat to do roughly 80~85mph without cooldowns , but that requires the right setup all the way from props up to the lipo's , a perfectly trimmed and reaaalllyyy looosssseee running boat and a perfectly prepped hull.

Trying to go beyond that speed pretty much limits you to single passes purely because the amp draw and heat buildup goes thru the roof

[vvviivvv]

I have 2 cats that can do prolonged runs at 100+

I wouldn't believe everything that comes from Oxidean marine, not a hater just not a fan.

Like above, you do need to run some pretty high end gear, my similar size cat to the Animal cat's ESC and motors are north of $2k. the whole animal cat RTR is $400 cheaper.

My bigger cat's engines and ESC's are knocking on $3500

It's possible but you need some high end gear, not RTR china grade.

[Iquentos123]

Ok, so this is more of an answer to all of you guys as It is easier to sum it up in one reply. Thank you guys so much for the info, I love learning although it lowered my standards heh. It's really interesting with the whole top speed thing.
It seems you guys have a lot of experience on this, also with running the boats yourself (some of you) so then is the next question (you will never get rid of me)
What would you suggest for a guy like me? I want a good top speed and I want to be bashing around. Preferably running quite cool. Would the TFL Zonda build above be good or could I get some more performance without suffering by scaling up to 12s setup or so?
And to you guys who have ran fast af boats, do you find the top speed pass boats more fun or the bashing ish ones? Should I rather be building a top speed boat?

Again so grateful for the answers, you are helping so much!

[vvviivvv]

All comes down to budget imo.

Zonda is a good starting point but they are known to disintegrate on high speed collisions which when pushing are bound to happen...

a 45" boat will go 100+ on 6s fairly easily. heck a 72" boat on 12s will go 100+. no need to be using such high volts at this sized boat.

If I were you I wouldn't build a "SAW" boat straight away, I'd build something more of a basher, you could then up the cell count / prop up in the event you'd like to make some SAW passes.

[vvviivvv]

For example - my HPR115, I have 7s and 8s setups, and then X447, X457(cut to 51mm) and ABC 2016

With ABC 2016 and 8s, its a 110mph+ boat which doesn't appeal to me most of the time, smaller props and 7s is more than enough but also nice knowing for say a SAW event I can come along and with some minor adjustments be one of the fastest boats in the UK (it probably is the fastest boat just not officially at a SAW event)

My C5008 im building on the same principle, 110mph is goal top speed on big props and 14s. I will have ABC 2515 for top speed and X465 cut to 60mm for 'bashing'

Edit - for any keen eye'd readers the 465 will also be bored to 1/4"

[Iquentos123]

Oh okay, that seems like a great way to do it! Only downside is that you need two sets of batteries I guess.

So regarding the earlier post where you said budget is the most important factor, would you have any ideas for a 2000-3000k build (Electronics)
And what would you do if budget wasn't a factor?

[vvviivvv]

at 2-3k USD I'd look for a used Mhz mystic 114 with decent spec. they do turn up well in that budget and are a reliable hull that'd get you a very good speed. only thing would be shipping from Europe could crush the budget.

Something like this is at the upper end of the budget - https://www.ebay-kleinanzeigen.de/s-...7908-249-16372
Video of it running probably not 100+ but with some modifications It's a solid start.

and money no object - Hpr115 Bulletproof, Lehner 2250's and Old school 40.160's or 32.200's. (HPR hulls haven't been produced in years but are renowned as probably the best cats ever produced)

[Iquentos123]

Okay, so let's say I have a hull, I only need electronics + props. I would want a setup like yours where I could go fast af, but also more of a fun setup for longer runs. You reaaaalllyy sold me on having for instance an 8s and a 7s setup. Can't imagine how I didn't think of that. Screw budget, but I don't want lehner. Anything else goes. Something similar to yours maybe?

[Iquentos123]

Okay, so let's say I have a hull, I only need electronics + props. I would want a setup like yours where I could go fast af, but also more of a fun setup for longer runs. You reaaaalllyy sold me on having for instance an 8s and a 7s setup. Can't imagine how I didn't think of that. Screw budget, but I don't want lehner. Anything else goes. Something similar to yours maybe?