Doh... Cinnabun has no idea what he's doing.. Help rio ep bl conversion

[Cinnabun]

Alright guys,

Got my rio ep like 3 weeks ago. The speed got old quick, so I bought a sv27 brushless system. I got the bl setup today, tossed it in the boat and took it out.

Instant disappointment.

Hit the throttle, and the boat cavitates, putts off and the front end plows through the water. I'm talking making a turn almost sends the bow to the bottom of the pond. It's obviously running way too wet.

On 3s its probably about as fast as the stock brushed setup on 7cells.

So I pull my trim tabs up, and it does nothing. I should essentially remove the trim tabs after how much I adjusted them.

And now I'm lost. So I'm looking for help. I used the stock motor mount, put the battery in stock location, and the esc is sitting right next to the motor. I looked at pics of other builds and watched videos. Those boats are hauling ass compared to mine.

[Cinnabun]

Im thinking 3s just isnt enough voltage. Going to go with a 4s setup tonight, and see how it reacts. Also going to throw my x440 prop on as well.

[J.W. Pepper]

Get Rid of Factory Motor Mount!!

...I used the stock motor mount...
That was your first mistake, the factory mount is fricking joke. ONLY way to do a "proper" BL conversion on the Rio EP is to remove that Mickey Mouse factory POS motor mount. I for the life of me do not understand why people try to put BL motors in that worthless POS mount

Goto PB's website & check out the motor mounts they put in the vast majority of they're boats, it's CNC'ed aluminum mount that attaches to the front of the motor - doesn't matter if it's a brushed motor in a $159 MG 24" RTR, BL motor in a Shockwave 26 V3 or one of they're higher end models. PB's way of doing things was my inspiration for removing the factory mount.

Removing the stock Rio mount is not hard, look at the corners (I attached a pic with red lines pointing to them), you should be able to lift up one of those corners a bit with needle nose pliers or small jewelers screwdriver. Once you get it started, just carefully work your way around till it comes out.

After that I used 220-grit sandpaper wrapped around a finger & carefully sanded off the high spots from left over glue residue till even with the hull. Then sanded the entire inside of the hull to smooth it all out. I attached a real old pic that I took during the mock up phase of my project. That should give you an idea of how the inside looks without the stock mount.

Once you've done that, you can epoxy one of these mounts in... http://www.offshoreelectrics.com/pro...prod=ose-80080 - if you decide to use one these mounts, give me jingle & I'll give you a couple pointers for getting everything lined up correctly, it's not hard trust me.

Check out post #15 in this thread... http://forums.offshoreelectrics.com/...-scratch-build - that's a PB 1800Kv motor from a IM-31 v1. Had the tabs set neutral and the boat was uncontrollably stupid fast (no plowing or porpesing) with a 3S on the stock batt tray. That mount is no longer available, and it was very time consuming to install; took about 8-hrs of hand sanding to get the wood blocks sanded to conform to the Rio's hull.
The revolt mount is very close to mine, but you would have do the same with it's wood blocks as I had to do with my home made ones. If I had it to do over again, I would get one of those mounts from OSE or Kintec - IN A HEARTBEAT!

And...

Post #51 in this thread... http://forums.offshoreelectrics.com/...ng-boats/page2 - that's the interior just prior to paint. That piece of wood going across the hull in-between the motor mounts & styrofoam is for the ESC. It gets the darn thing outta the way. It was originally designed for & used with the AQ 45A ESC from SVR. Because that PB motor + SK ESC setup didn't work out the way I hoped, the AQ ESC is now back on that tray. I run the water line from the P/U to the backside of the ESC, put a horseshoe on the port side, then front line goes over to the motor then out.

If you have access to a bridgeport mill & sandblasting machine, I would suggest cutting down the rudders, made a HUGE difference the handling, for the better. I went to a local gunsmith that I've worked with in the past and used his equipment.

Sorry for the long winded post, I just wanted to cover all the bases in one shot & be done with it.

Good luck with your project, hope can get it worked out.

Alright guys,

Got my rio ep like 3 weeks ago. The speed got old quick, so I bought a sv27 brushless system. I got the bl setup today, tossed it in the boat and took it out.

Instant disappointment.

Hit the throttle, and the boat cavitates, putts off and the front end plows through the water. I'm talking making a turn almost sends the bow to the bottom of the pond. It's obviously running way too wet.

On 3s its probably about as fast as the stock brushed setup on 7cells.

So I pull my trim tabs up, and it does nothing. I should essentially remove the trim tabs after how much I adjusted them.

And now I'm lost. So I'm looking for help. I used the stock motor mount, put the battery in stock location, and the esc is sitting right next to the motor. I looked at pics of other builds and watched videos. Those boats are hauling ass compared to mine.

[Cinnabun]

I ran it on 4s tonight and it was getting on plane ok. It's still way too wet though. I'm going to try again with the stock prop tomorrow and see if it gets any better.

With my x440 2 blade the torque roll was so bad. I'm going to redo my battery locations and try again. If I can't get it ill ditch the project lol

[lenny]

Hey,
I need to see some pictures of the setup and hardware to.
Than we can see what is going on.
I ran mine sunday on 3s and a x440/3 prop with the stock motor mount and some hot glue,
And hit 44.6mph with mine tabs down and added weight to help it stay in the water.
I still have not hit full throttle yet,
But it is running pretty stable at 40 mph now.
Goal is to do 45 mph and nice and stable and just for the speed run testing at this time.

[Cinnabun]

Lenny, it's completely stock hardware, with a sv27 motor and esc tossed in. The cog is roughly 7.5" from the transom. It balances out right about where the coupler is.

Running 2x2s, one on each side of the motor and the esc mounted to the front of the motor.

[lenny]

My cell is at the transom,
It sound like you have way to much weight forward.
Like I said,
Need to see where things are.

Rio mod esc to side. 005.jpgRio mod esc to side. 006.jpgstands 028.jpgRio mod esc to side. 007.jpgPictures of 36 shockwave 053.jpg

[Cinnabun]

[Cinnabun]

Looks like I need to lose the radio box...

[lenny]

And you need 3/16 gap at the prop dog to stuffing tube to,
If you cut the tube at the dog make sure it is nice and smooth when done.
Or it will cut the prop shaft right off.
What kv is that motor ?

[Cinnabun]

It came from a sv27, so I'm going to say 1800kV... I will pull the prop shaft out a bit, I have some adjustability in it.

I tried adjusting the stuffing tube a small amount, but it either caused the boat to cavitate or run wet. When I take off, it takes about 4 feet to get up to speed, within those 4 feet its all bubbles and cavitation.

[lenny]

On what props does it do that ?
And what temps did you have on that setup ?
Also did you sand the bottom yet ?

[Cinnabun]

The only prop I have is the stock one, and the octura x440. The x440 is the one causing cavitation and slow take off. Temps are barely above warm on 4s after a 5 minute run. I haven't tried the stock prop on 4s.

[lenny]

I think the weight to far forward is the main problem,
It like a seesaw at this point.
And the prop is lifting the back of the transom up till it can bite on something.
You should be getting 30 mph on 3s with that setup and a 440/3,
If all tuned right.

[lenny]

Is the x440 prop S&B good ?
You say stock prop,
Do you mean the Rio 42mm 1/4 plastic prop ?
If so try that on 3s that next time out testing and put the 3s in the stock cell holder,
Use a small 3s mah pack if you have one that can fit there.
And than see what happen.