45" Dumas Scarab

[lenny]

I found a HV 130a seaking with free shipping hear.http://www.aliexpress.com/item/HOBBY...687251393.html

[Ken_NJ]

I not familiar with brand names in this area. Hobbywing, Seaking? All the models I built was with stuff I had on hand from years ago. (Marriage and kids interrupted the model boating life but that is over now). So I guess the China stuff is what everyone uses? You wouldn't say to get a 130A esc if it wasn't the right one. How do you judge 130A?

[srislash]

I not familiar with brand names in this area. Hobbywing, Seaking? All the models I built was with stuff I had on hand from years ago. (Marriage and kids interrupted the model boating life but that is over now). So I guess the China stuff is what everyone uses? You wouldn't say to get a 130A esc if it wasn't the right one. How do you judge 130A?

I would look t the motor recommended wattage, then divide by the volts you are going to run. That will give you the amps. In this case 5280 watts / 33= 160 amps. I am pretty sure the controller is rated at 130 amps at its max voltage capacity. Meaning it is good for 6300 watts or better.

That is how I go about it anyway. If the budget is in mind this should be a knock off or Hifei Swordfish ESC http://hobbyking.com/hobbyking/store...ooled_ESC.html

I believe Hobby king just buys in mass and rebadges this stuff much as Walmart does.

[Ken_NJ]

In post #2 I listed a 200 amp motor that Lenny pointed out the HK comments indicated that 200 amp model was questionable. I see no negative comments about the 240 amp one. It is more pricey, then again this is not a cheap hobby.

I have all of the original Dumas parts, instructions and all. I attached a pic of the Dumas drawing of the section of the drive area. If I went submerged, not sure how far below the hull the shaft should be.

[srislash]

Ken that motor rating is at 10s in 'Y' configuration(129amps) or 6s in Delta configuration(229amps). I think for 8s in 'Y' configuration 200 amps should be safe.

I just thought of another more reputable option http://keithbradleyboats.com/product...s-200a-hv-esc/ Not sure where else you can find these but Hifei Swordfish are good. That is why I recommended the HK 240 one there. I have the Hifei version and it has been good for years.

[srislash]

Can I add in here Ken that you can prop up and push way past those stated numbers or you can prop down and never see them.

[Ken_NJ]

So with any of these motors I would be OK? For the motor I was told use the delta config as that would give me more torque? In delta, the motor would be at 38k rpm's. In wye it would be 21.5k rpm's. I'm learning on the job here. And since the motor is a 56mm I guess any 56mm mount will be OK? Something with good support.

Swordfish 200amp: http://keithbradleyboats.com/product...s-200a-hv-esc/ $199.99+
Aquastar 240amp: http://hobbyking.com/hobbyking/store...ooled_ESC.html $215.99+
Seaking 130amp: http://www.aliexpress.com/item/HOBBY...687251393.html $149.90

Boat work...
There is a section of 1/8 plywood that Dumas supplied that needs to be secured inside the transom. They call it a transom double, can be seen in the drawing in post #19. That required lots of shaping to get it to fit. I also sanded the inside transom with course sandpaper in preparation for fiberglassing it in. My can of fiberglass is old and sealed itself shut so have to pick up another can and some white coloring agent. Will posts pics when I have some more work done.

[iridebikes247]

http://offshoreelectrics.com/proddetail.php?prod=hef-HBC0240L-CW

You will fall in love with this esc, in your setup it will stay ridiculously cool like below 90 degrees. I ran run 4 of these escs sometimes demanding environments, sometimes not. They always perform flawlessly. I would not go with that turnigy 130 esc that motor you've got is big, it WILL spike.

Remember you're running a big can motor in a less efficient hull that motor will pull some amps on a spike. Its $250 for that esc and you'll have it for a very, very long time. When it comes to big motor setups you have to be careful and the price jump to a sf240 will be well justified.

As Shawn was saying that motor should pull some 6300 watts and the esc is capable of it, just depends how close you want to get to the max. the sf240 has been known to handle 10,000 watt spikes without an issue.

[Ken_NJ]

Oh boy, that was the first esc I had on my list, then started trimming things down as the spreadsheet costs were getting way to high. But I know the esc is important investment. No matter what I do I'll be going over my budget.

Great advice on this forum, and as many people there are you will also get that many opinions.

[iridebikes247]

I mean other guys have had luck with the seaking 130 and lenny seems to have found the best deal for it, you could definitely give it a go.

[twissted]

If cost is a issue then look at the HK 180 esc. It will do the job. Up to 6s. This must be a fast build for you. Looking at the builds past. I'm surprised it not a 1/6 hydroplane or something with more detail. Your skills are more than the sum of these parts!

[srislash]

Oh boy, that was the first esc I had on my list, then started trimming things down as the spreadsheet costs were getting way to high. But I know the esc is important investment. No matter what I do I'll be going over my budget.

Great advice on this forum, and as many people there are you will also get that many opinions.

You won't go wrong with that ESC.

[lenny]

ken how wide is you 45" hull at the transom ?

My thinking is that this sport scale build is for sport and fun running,
At speeds of 50 mph tops at some times.
And if this little motor,http://www.atomik-rc.com/V700-Marine...er-1100Kv.html
On 6s and a T180a esc can move a 58" cat to 45mph gps and still keep temps in check,
Than why would it not work even better in a 45" V hull if the boat is trimmed out right.

Also this is a nice setup in a 40"Vee but not sure on what speeds he was getting.
http://forums.offshoreelectrics.com/...tte-40-quot-6s

[twissted]

This is up for grabs on ebay.
save you some money.

http://www.ebay.com/itm/new-warehouse-hobbies-enforcer-outdrive-for-gas-rc-boats-large-scale-zenoah-/131140212795?pt=Radio_Control_Vehicles&hash=item1e8890d83b

[Ken_NJ]

The boat is 13.5" at the center, 14" at the transom. The transom height is about 5 1/4" at the V. That's all I'll be running this for..... fun! I'm committed to the Turnigy motor, will be here tomorrow. Toss up on the ESC! My hands are on my head. Have to order this tonight to get going.

That outdrive would be a very nice touch since the original ran with Mercruiser outdrives.

I bought this little brushless boat NIB from a LHS fro $150 before Christmas. He is selling out. Put 2 NiMH 5000 mAh packs in, ran about 20 minutes. Bought it so I have something easy to throw in the car. Ran it first time this afternoon, took some getting to use running something fast compared to my slow scale boats. That was fun, can't wait to get this done.