So I'm back...
A few years ago I started a scale build of a 38 KV Scarab, 1/6th scale. In a nutshell the project failed but in failure I learned. First, the boat was too big...72" My basement shop has two connecting rooms.
Every time I moved the boat from room to room it took divots out of the wall...strike one.
The molds I cast of the deck and hull had MAJOR gel coat issues...strike two.
The final topper was a stupid design flaw that should have never happened...strike three.
At this time, a little over three years ago a business venture presented itself which devoured most of my time. This was a blessing as it distracted from the boat failure...
This new venture required me to become proficient in CAD and 3D printing.
The business is on hold while we wait for some patent issues to get resolved...so with time on my hands what do I do with my newfound skills...attack the Scarab build again of course!
Here's what I did.
I had an 80's Monogram model of a Miami Vice 38 KV Scarab 1/34 scale.
I sent the deck and hull out to get 3D scanned. The final scan was enlarged 444%
The deck and hull were divided into 27 separate pieces in order to be printed the final size...61" It's big...but not as monstrously huge as the first one. The pieces went together precisely...so good it was scarey.
These two components will be used to make a final gelcoat/fiberglass boat.
So with the deck and hull ready to be molded when weather permits I turned to the drive train. I found outdrives from a German company called Bauer-Modelle. They fit the boat nicely.
So before I go any further let me explain what I'm after. I'm not looking for a pond rocket. I want my boat to get up on plain and do a real life 18-20mph...that will give me a scale speed of 65-70mph if my math is correct. The folks at OSC recommended the motor and ESC combo.s The throttle will have to restricted as the outdrives can only handle a top rpm of 18-22,000.
I built a plywood mockup of the Scarabs stern for component placement.
I have the ESC's mounted above the motors for maximum air flow...also I'd like to have two small water pumps doing the cooling and have the water coming out of the exhausts while a sound module blasts the sound of twin V-8's...nothing with me is simple...I'm ok with all show and no go lol!
So...batteries.
The more I learn about lipo's the more I want the two I got from OSE out of my house. They are sitting in an steel ammo box in my basement at the moment. The more I tried to learn about them the more exploding videos I watch on YouTube.
Since I'm after show, more than go, I went with nimh batteries. I soldered up two packs...14.4 volts at 4300mah. I'm assuming volts are volts...right? Does it matter to an ESC/brushless motor combo if the power is from a lipo or a nimh pack?
This morning I attempted to hook up and spin the motors for the first time. I got juice to the steering servo and third channel...they worked fine but no throttle response...just non stop beeping. I immediately unplugged the batteries...hopefully no damage occurred. There was no smoke or smell...
Any advice would greatly be appreciated...I'm no means an electronics guy...
Anyway, here's some pics...no particular order.20180919_122256.jpg20180920_155443.jpg20180920_155443.jpg20180919_122246.jpg20181002_133414.jpg20181002_133551.jpg
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