Project Genesis II - the 10s SAW Build

[RCKong]

I have a few 4mm set ups I use that work nicely, I just don't use them on anything over 2000 watts.

[FighterCat57]

I have a few 4mm set ups I use that work nicely, I just don't use them on anything over 2000 watts.

That sounds like a safe threshold!

[FighterCat57]

Some updates;

Installed a high flow fan on the ESC and the V-Bracket to offset the rudder.

Getting closer!

I have the 4.76 cable/strut on order, so will update it when the time comes. In the mean time, I think this kind of RPM can rip this hull with a 442.

[FighterCat57]

OK, she's almost ready for the 6s test run. Figure I'll start off with 6s and play a little with the boat to get a feel for it and then start creeping up to speed. =)

[steveo]

can i make a suggestion that mount make sure its secure from the looks of the first few pics there was a little bit of fiberglass maybe even run a stringer along the side of the mount . i did this in my m-1 super cat after the motor mount came apart with a 1518 but i also did not have the rear support like you have but with the long tunnel you will have some flex that may weaken what you have there especially on 10s. of course i went overkill on mine but its nice to have the extra insurance

[Fluid]

I'd like to test the limits of the stock setup....If it cracks, breaks, I'll reinforce it then.

Post #4.

[FighterCat57]

I <3 Fluid.

[FighterCat57]

60's on the maiden run!

A water leak somewhere that caused the rx to default led to a scare. Psa if you use a car rx with an air esc change the neutral safety to default to "full reverse" or zero. This one defaulted to 50% throttle and caused a bit of a scare. Fortunately it was headed to the shore when it took off.

[FighterCat57]

Update, the run time data showed that the Zippy packs were dipping down in voltage under heavy acceleration. But otherwise, temps were good and amps were within range.
Next step 440 CNC prop and 10s. It calculates out to 190 amps, so I may have to change the ESC, but will try it since the ICE has current limiting.

On a side note, it's amazing the difference that an offset rudder makes!

[FighterCat57]

This was an awesomely fast setup!

The 4mm handled 6s and a 43mm prop just fine and ran several packs through it using the stock cable.

It handled a run on 8s /43mm prop and about 70mph 3.1 1/16th mi

Finally the 4mm shaft gave up on 10s / 43mm prop. So I upgraded to a High Strength FC .078 wire drive and ran 10s / 47mm prop and ran low 80's for a run or so.

The dayum rx defaulted to 50% throttle thinking it was neutral failsafe and the 1520 ran wide open for about 5 minutes then finally came apart and took the speedo with it.

I pulled out the ICE and put in an FC 16s/200 and ran it on 10s for a few runs, but kept flipping it at top speed on the return passes. Ran some 2.6's, 2.7's in the 1/16th but had some nasty gremlins from the water that got in the hull early in the day. Took out an Rx and caused some signal loss and strange happenings...

So this project is done. Had some fun results, but would have worked better with a stick tx. Think I'll pass on trying to use a pistol grip with an ICE controller again. Perhaps the small cost of a pistix would have paid for itself the first time it helped avoid the crash and destroyed the motor.

So the hull is OK and the motor mount is solid, aside from some cosmetic damage everything held up great for some wild crashes. That's without any re-enforcement, the hull held up great.

The only place I had to add extra epoxy was the transom where the rudder was mounted at the seam. It's a bit weak at that point. Otherwise the hull is straight and solid.

To recap;
I did order a stick tx/rx to work with the twin ICE boat I'm building in another thread. =)
The ICE 160 and the 1520 work very well together on 10s under load. But unloaded, it's eminent doom for the both of them. It's just too much RPM.
The stock 4mm drives work well with 6s/1600kv and a 43mm propeller at about 50mph
The transom needs epoxy strengthening to prevent the seam from cracking

The three piece brass .187 collets suck. Lost three cables using them. The cables just spin out of the brass clamp on throttle down.

[JackBlack26]

Awesome! The square end of the cable on my gen lasted 4 feet when I punched the throttle with a 1512 1800kv on 4S, 2P. lol

[FighterCat57]

Awesome! The square end of the cable on my gen lasted 4 feet when I punched the throttle with a 1512 1800kv on 4S, 2P. lol

Lol, yeah they won't take much torque. It really helps to epoxy the end of the cable into the shaft. =)

[FighterCat57]

OK, for you cannibals, here's the guts of a chunked up 1520.

$10 shipped if anyone wants it. lol.

This was totally my fault for using an Rx that I knew didn't have the right safety and risking the boat losing signal, which it did. Lucky nobody was hurt.

BTW- when I plugged in the ESC earlier today, it popped and smoked, so apparently it didn't survive after all.

FighterCat Builds 009.JPGFighterCat Builds 010.JPGFighterCat Builds 011.JPG

[JPriami]

If you put a little JB weld on that and put it back together it will fire right back up and prob work a little better now that it's broke in. :)