Something to talk about, HV Micros

[J Solinger]

I know that most all FEers are speed freaks, we just can't help it. But big speed generaly means big riggers and big money. Here is a different thought on the subject. How about a rigger about 24" long using a Nue 1115/6D, a Castle Phoenix HV-45 and a 10s battery pack. This would have a low power comsumption so there isn't a need for large battery packs. This arangement offers low amp draw with high 750 watts continuos, 1400 max, watts of power. I think a boat with these attributes could possibly be held under 2 pounds with very narrow sponson and tub profile so it can handle wind and waves. Any thoughts?

[Simon.O.]

I know that most all FEers are speed freaks, we just can't help it. But big speed generaly means big riggers and big money. Here is a different thought on the subject. How about a rigger about 24" long using a Nue 1115/6D, a Castle Phoenix HV-45 and a 10s battery pack. This would have a low power comsumption so there isn't a need for large battery packs. This arangement offers low amp draw with high 750 watts continuos, 1400 max, watts of power. I think a boat with these attributes could possibly be held under 2 pounds with very narrow sponson and tub profile so it can handle wind and waves. Any thoughts?

Anyone want to define a Micro?

Given that you called under 24" I am keen to play.
I have 2 hulls that will qualify and a few more if the bandsaw wants a feast.

Seriously Joe, I can see where you are coming from. HV or for me higher voltage is a good thing.

I have a few boats that were built for 6-7cell Nimh + Brushed. I then went BL and speced the motors for 2S. I now have 2S lipo.
Long story short is I now also have a 3s lipo and a 12S motor that will whip the butt of the 8S motors on 2S lipo.

I am keen to go for a higher cell count and higher wind to lower the Amp draw.

I will follow this thread and if it does not kick-off then I will be in your ear for some ideas.

[NativePaul]

In Europe the Mini/Micro classes are sub 450mm hull length, gear can stick out further.

[RayR]

Joe,

What 10S packs will fit in a 24" rigger?

All the best,

Ray

[Meniscus]

In a 24" rigger, I'd imagine that 2 flightpower 5s packs should fit one, behind the other in the tub. Something like these.

Great concept Joe, I'll be watching this one!

Regarding sizes, we have given it a lot of thought here locally and came up with the following:

Micro size class = 1" - 16" long
Mini size class = 16.01" - 21" long
Standard size class = 21.01" - 30" long
Large size class = 30.01" and up

For our classifications, let's say a 21" rigger, I don't think it would be long enough to run the packs one behind the other. Joe's estimate of 24" seems perfectly logical to me.

[egneg]

The XS2 tub is 24" it's all I can do to get 4S1P in the front as the motor needs to be about midway for COB to be correct. The motor would have to be in the back get 2 packs end to end. If you put the motor more towards the front and the packs in the middle the tub would need to be 3"wide/high depending on how you placed the packs. Either way I think the boat would have to be designed around the setup.

[ReddyWatts]

I like threads like these where people are thinking outside the box. Being "creative" with reliability and cost in mind for sport boaters. Hope you find a combination that works for you.

[J Solinger]

I guess it realy wouldn't be called a micro, but the idea could be shrunk down some more. I did some battery hunting and found a few options. There are some packs used in air craft that are long and thin to fit in the fusalage. The motor and esc could go in the front of the tub with the packs on edge, on both sides of the drive line.

[tylerm]

If you want say 1000watts input then you'll only need battery packs capable of 25 amps(real, so maybe 30-40amp disharge?) Then you should get at least 800watts at the motor shaft? then a bit less at the prop?

You could have 2 of these in series for plenty of power, 46 amps is the continuous rating.
http://hobbyking.com/hobbycity/store...-30C_Lipo_Pack

Is $80US an acceptable price for chinese batteries for a 24 inch boat though?

Tyler.




P.S. what about 8S? Youd could do that for $60US, and still have 1000watts input without stressing the cells, as well you would have less weight?

[Ub Hauled]

I have used 2500 5s in a 24" Blizzard... the thing was FAAASST,