VID: 45 inch Scale Hydro with Hyperion outrunner - MPH estimates?

[nichismo]

Hey guys,

I posted a video recently of this same build, mentioning it was my first. It was pretty lackluster to say the least, and was actually only my third time driving at all. But ive had a much better session now, what I believe is now my first true successful day at the lake Very fulfilling! However I still lack alot of the typical tools and such in my arsenal to help me gauge performance or schematics of any sort. So I was hoping I could get a little bit of insight towards those respectively from any of you guys!

https://youtu.be/ZfvvggSNmf8

Heres my setup:

hull is a Phil Thomas T5 modified for Lipo power
Motor - Hyperion 4035 - 800kv
ESC - Castle Hydra Ice 200HV
Prop - Octura x450/2 blade
Batteries - Revolectrix 8s in series, (4s 5500mah)

Really love the Virginia Craftsman turn fin from the well recognized Mr. Tyndall.... Really had zero obligation to mess with the turn fin setup at all, whereas I feel like this can be actually a very confusing aspect of hydroplane setups. All I had to do was setup the bracket to be perpendicular to the floor and thats it! Now it turns on a dime! (at least as far as I can tell!)

Alot of people have told me that this prop was far too small and one person even suggested it wouldn't be large enough for the boat to get onto a plane.... Clearly that wasn't so accurate. Glad I stuck with this and decided to test it a few times before impulsively spending 60-70$ on a 3 blade x455 like I nearly did. But nevertheless, I still want to go slightly larger, as temps were all well within comfortable range.

Thanks!

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[Doby]

40...not much more.

[Doby]

Have you considered running 10S?

[Doby]

What C ratings are the batteries?

[nichismo]

yes I actually have a 10s setup too, just havnt tried it yet. Wanted to get some more familiarity before I went with that.

All my batteries are Revolectrix Silver, rated for 70c I believe with a Max burst of 140c. My 5s packs however are 4800mah.

Im only going to go with Giant Power from now on though.

You dont think at the beginning of the video I wasnt more between 45-50? I notice I lose top end rather quickly, and once I get home I notice the batteries arent very dead either. Perhaps something I should change with my ESC settings?

[Doby]

Well, with my calibrated eyeballs, its currently a "slug"...sorry, but that doesn't mean its not got potential. I assume that with the 10S setup, you are using the same motor. I run a 10S2P setup in my 1/8 scale and its very fuel efficient. I can run two full heats and still have 30% left of the 10,000 mah capacity.

[nichismo]

mmm, my lack of experience is abundant! How big a difference, aside from the extra 5,000rpm, will 10s make? Will the motor run substantially hotter? Also, I have the motor timing set at 8 on the ESC.

What do you suggest as far as improving on this sluggish nature? haha, the boats relatively light still, about 14.5lbs in the vid. Should I go with a bigger prop and maybe increase the timing? Im thinking about getting a Typhoon motor.

[iridebikes247]

About 40 mph I agree with Doby, 10s will make a big difference you can check the ose speed calculator.

The 4035 is ok, this is a 40" hydro right? The motor weighs 450 grams, a Leopard 4082 weighs about the same.

Now think about a leopard 5692 1000kv, weighs about 900 grams. Power will be absolutely nothing like that 4035, or a 1527. Lots of torque and a pretty good rotor to handle 10s2p, you'll have the option to run 8s as well.

I am not a hydro person so won't attempt to give advice on setup, but can tell you a big can motor or a big neu will have a lot more power without question. This will allow bigger props while keeping temps in check.

[nichismo]

the boat is 45 inches long and around 2 feet wide.

i actually I had a Leopard 5698 - 850kv I believe as my first motor early on, but I ended up selling it was just too large(progressing as a builder im sure incould easily fit it now) and as i dont see anyone here in the states using 56 mm motors in their 8 scales so i went and sold it.

This motor I'm using now has been an experimental option in 1/8 scale for a while now, and more revealing are the 1/7 scale guys here in WA swear by it on 8s and they are all running right around 50mph apparently. But the lack of any supplemental cooling worries me.

I'm considering picking up one of these, as it's an approved motor and bolt right in, along with fitting a Neu or tp water jacket on it:

http://www.allrc1.com/#!product/prd1/3777856531/typhoon-700-series-840kv-fe-motor

Surely if the boat isn't too darn heavy, I can squeeze a good chunk more of performance out of it? I'm thinking of picking up a couple new props, maybe x455 and see what kind of headroom I have, and if applicable I'll change the motor timing to 10. probably change the front canard angle too to allow a little more air underneath

[iridebikes247]

Oh alright, maybe the 56mm can is out then. Neu 1530 is extremely powerful but $, there is always the Tp 4070 I hear its a really good motor. I haven't seen the typhoon but more people are using them so probably worth a try.

[nichismo]

The TP 4070 is something that ive been really considering lately too, ive been having alot of trouble trying to decipher how comparable it is in performance to an application like this vs the other respective 40mm canned motors like the 1527 and Typhoon. Clearly the wattage specs that TP lists are probably a bit exaggerated, but it sure seems like the reception for TP motors in general that ive come to see have been very very positive! I mean TPPowerusa.com has a 880kv, 5Y 4070 right now for only 119$ and that includes a water jacket. Sure is hard to pass up. Aside from OSE, ive rarely seen many 1/8 scale hydro guys that have had a halfway decent amount of experience with electric setups.

I have indeed been entertaining the idea of a 56mm motor, just not for this exact project. I have a couple more 1/8 scale hulls right now and one of them in particular I know for sure ill be experimenting power options with. I think im going to start with a TP 5650, really love the apparent power and really short can, its going to be able to sit really far foward in the hull and lower the COG too.

Im going back out for another session today, but ill probably go to a different lake which may add a little bit more perspective, ill keep you guys updated. Thanks so much for the insight

[Cottageboater]

Nicholas, as you know, I built the same boat. I used 10s (Turnigy 45C lipos - not nearly as good as yours), a Neu 1527 850Kv, and a CNC x450 3 blade prop. On the gps, the boat consistently ran between 57-59 and handled great. I used the HET 840kv motor in my Dumas Circus Circus and it ran 60 mph with the same lipos and prop. If you go with the HET, it should work great. If you want to stay with 8s, check the swap shop, I have the 1170 version for sale.

[iridebikes247]

^Sounds like The HET is a good option.

I can tell you most of the ratings are complete garbage out there. For example Neu lists the 1527 at like 2500 watts or something, the Tp 4070 is 3850 watts then 7500 watts burst, rpm 45K.

Most ratings are useless, only real way to compare is by running them and talking to people with experience. The Tp will handle 7500 watts burst and could pull over 7500 watts in a good or poorly setup boat, depends on a lot.


Imo motor weight and pole # will dictate a lot in terms of power, nothing magic about it. Lmt weighs the same as 5850 but is 2 pole vs 6 and I think this shows in the temps/efficiency up high.

^^As Cottageboater said the 10s setup with 1527 worked well, the Tp 4070 is without question worth if you can't get the others. The Tp 5650 piqued my interest awhile back too but the 1527/4070/HET would probably be easier on stuff.

Boat looks good btw

[nichismo]

Well Cottage was kind enough to sell me his Brand new HET 1170kv version with the waterjacket for a fantastic deal, so ill be testing that next. However, while im waiting for it to arrive, im going to take everything out of the boat and go back to finishing some of the bodywork.

Since this motor is much higher kv, obviously im going to stick with 8s on this motor and also hold off on buying any bigger props for now.