GRX SAW RiGGER

[grsboats]

pics Gill

[martin]

Gil many thanks for the pics. Martin.

[grsboats]

You're welcome Martin.

[grsboats]

Ok back to smallwater(our test lake) today for some tests with a new pair of front sponsons and boat is ok turning a small prop.also ran the Ice 240 that worked great till open the boat and see bulged caps.Got in touch with Castle and will send it for repairs plus add a cap bank.

here's data logging:
voltage 25v
ripple 4,51v
current 231,3A
watts 4517w
temp kind high 100,5C
rpm 47261
throttle in 1,973
power 100%
A hours 5.04A

vídeo http://youtu.be/umZnKdhaWkw
Gill

[RaceMechaniX]

Gill,

Was 231A the peak current? And was the ripple 4.51V @ peak current? I was seeing 3.1V ripple at same current levels and 4.6V peak ripple at the 400A peak during acceleration. I have had the same blown cap failure with the same combo. It happens. Extra caps on the esc side of the battery connectors will help.

TG

[Brushless55]

Gill,

Was 231A the peak current? And was the ripple 4.51V @ peak current? I was seeing 3.1V ripple at same current levels and 4.6V peak ripple at the 400A peak during acceleration. I have had the same blown cap failure with the same combo. It happens. Extra caps on the esc side of the battery connectors will help.

TG

if its ok, please explain this out a little for us...
or at least me

[Chrisg81983]

Boat looks great gill

[grsboats]

Tyler yes peak with a small prop 231,3 so I'm afraid to try my best props with this esc (47mm) where probably I will have higher peak as yours.Anyway esc was sent for epairs and will add an extra cap bank.Brushless let's explain by parts:peak current is the amperage our set ups are drawing during a hard run and ripple is the change in voltage that is measured each time our motors are pulsed......hope this helps you.Thanks Chris hope to get better vídeos soon as this one was taken with a GOPRO .Gill

[RaceMechaniX]

Gill,

My 400A peak was with a ~47mm prop so I would expect to see similar conditions with your rigger. I am stating the obvious here but warm batteries, very solid battery and motor connections along with short wires all around helped reduce the ripple and cap failures. I have not failed a 240 ICE recently after the careful prep.

TG

[grsboats]

Tyler what cap bank do you recommend as I see some diferent models here at Ose.I liked the Castle as I can keep it near the esc...don't have much room for a big one.Thanks Gill

[RaceMechaniX]

Gill,

I have been buying the Fighercat racing cap boards and adding my own caps. This way I can use the maximum capacity and appropriate voltage level for a specific application. For 6S I use 35V caps and for 8S-10S I use 50V caps. I also made some for P and N2 with lower voltage caps that require less space or have more capacitance for the same volume.

First pic shows the assembled cap banks, two 35V and one 50V assemblies using Nichicon caps.

Second pic is a MGM28026 with a 35V cap bank on 8AWG wire for remote mounting.

TG

Cap bank.jpgMGM ComPro 28026 with cap bank.jpg

[grsboats]

Tyler is it better use 4 or 5 caps with my setup Neu 1527Castle 240? I can get the Castle cap bank and add one more. Thanks again Gill

[RaceMechaniX]

Gill,

It is more dependent on the total capacitance. I don't know what the total uF of the Castle system is, but the cap banks I soldered up with 35V caps are 7500uF and with 50V caps I have 5000uF. I think this is quite a bit more than the castle unit. I also don't know the quality of the Castle Cap bank, they look like Rubycon copies.

TG

[Chrisg81983]

I think the castle caps are panasonic but not 100 % on that. I came across a bunch of 63/1000's made by panasonic and they are identical in looks to the castle ones

[Chrisg81983]

I think the hv castle cap bank has four 220uf / 50v caps on it