Need Help Again!!!

[millzrm]

I previously posted a thread about my Agua Jet and Jeti setup. After many posts and a lot of help from Steve I thought I had resolved all my problems. I started to replace the components becuase of the problem below:

I finally got the lake to run the boat and I am experiencing the same problem then led me to replace my motor, ESC and receiver. The boat has no power and doesnt plane at all.

700 SC motor - brand new
Jeti ESC - brand new
2 - 3300 GP batt - batteries are fine as they work fine in my RC Truck
2 - 4200 IB batt
Futaba T2PH pistol controller w/ newly replaced receiver.

I am puzzled at why my boat does plane and for the most part just goes through the water at idle speed. The only component not new is my original servo which would have nothing to do with the speed.

I wonder if I have a short or bad wire in my tamiya splitter? I ask this because this is pretty much the only think left that has not been replaced. One odd thing is that I get the same speed/results in the boat whether I have one 7.2 V battery or two?

Does anyone have any suggestions?

[RMZDADDY]

I hadn't read your previous thread, so this may have already been asked. Is your splitter a series or parallel splitter? If each batt connector has two wires going directly to the esc connector, it is a parallel connector. Going from 7.2 to 14.4v should dramatically increase the rpms.

[Fluid]

You have probably answered your own question. On 12 cells that motor should be spinning around 18,000 rpm and the boat will not "idle" along. It is virtually impossible for you to get two bad motors and two bad ESCs in a row.

Do you have throttle control - does the motor speed up and slow down as you cycle the trigger? If so, then the most obvious source of the problem is the Y harness. Is it a series or a parallel harness? If it is parallel, then that is your problem.

.

[millzrm]

The batteries are in series, so I hope you are correct that it is just the Tamiya Y splitter. The throttle trim on the controller is turned all the way to the max. If I turn it down I can reduce the speed to nothing. With the throttle trim to the max and the trigger pulled to the max there is barely a wake and the boat moves at a whopping 1 mph at best - a far cry from the 25-30 mph it normally does.

I will try to replace the splitter and see what happens.

Thanks

[Steven Vaccaro]

Is the motor spinning very fast but the boat is not moving? Or is the prop barely moving? If the prop is nicked it could be causing bad cavitation.

Is there a way to post pictures of the wiring or better yet a video of the problem in action?

[part time]

i think your problem is that the esc is not programed right. when i had my aj with the jeti i had the same problem sometimes. i dont remember it it was caused by turning on the rx first or not arming the esc right. also get rid of the tamiya connectors the will not hold up long get some deans.

[millzrm]

I will see if I can get a video, but I did some further investigation. I do not think that it is the JETI's setup because I was experiencing this same issue before I started replacing all of the components (moter, ESC and receiver). After help from Steve and a new receiver the learned that the JETI sets itself up and beeps once when set up correctly. A few times I have heard the multi beeps so I try again and I get the 1 beep setup.

Today I took my tamiya y splitter and hooked up two batteries to my RC truck. I have done this before and the truck normally streams with 14V's and I can not run on 14V due to the ESC and motor heating up. Today the truck was no faster on 2 batteries compared to running on either of the one batteries. This leads to back to one of my original thoughts.

The prop is not damaged by any means. I dont think the motor is spinning at full speed because I dont think it is getting the full 14V.

Another question, shouldn't I get some decent speed out of one battery, I would thinkt the boat would plane out and get some speed?

[Quicksilver]

That's pretty much the same setup I just installed. Hasnt had a problem yet, beeps once everytime and goes like mad.

Do you have pictures of this setup, so we can see the wiring, and hardware. It doesnt make sense, the motor should have enough power even with some binding to get on plane with the right voltage. I didnt even think you could program this esc, just plug and play.

p.s. also pic of that y-harrness, mines not in my pic.

also I would test the batteries. Check each cell, if it's built like mine. When I was having trouble after my esc failure, it took a while before I figured out I had a bad connection in the packs, which led to the whole failure.
remember when charged, your looking for 1.4v and over for each cell. I'm getting about 1.46v per cell now on IB3600's

[millzrm]

http://www2.snapfish.com/thumbnailshare/AlbumID=162428136/a=98608270_98608270/t_=98608270

Not sure the pics will be of much help... I may upgrade the bullet connectors to deans, but I had the bullets lying around and I havent had any problems with them in my truck.

[Quicksilver]

apparently I have to sign up to see them and that's not happening

[NorthernBoater]

The bullet connectors should be better than deans plugs. If they are like the ones on this page http://www.offshoreelectrics.com/products.php?cat=39 and soldered on they will be able to handle more current.

[millzrm]

Sorry here are the pics.... I tried to stop and the local hobby shop but the girl working had no clue about anything related to RC Boats. I am not sure she could have even worked the register if they had what I need. I couldnt find what I need and I was very frustrated with the lack of service, they deal mainly in gas/nitro boats. I may just have to wait until I return from vacation....

cen1.jpg

cen2.jpg

cen3.jpg

[Quicksilver]

well, yep pics didnt really help, I thought I'd see a y harness and say hey thats setup in parallel or something, this just doesnt make sense.

If I've learned anything from LHSs is they dont know anything. At least the ones I've gone to, or at least they act like they dont know a thing. They serve very little use to me anymore, home depot and ace hardware serve more of a purpose. That and the internet.

[Rex R]

do you own or have access to a voltmeter? if yes, disconnect one motor lead and connect the voltmeter's leeds to the powered side of the motor leads, hook up your fully charged boat battery, give it a short (one or two sec) burst of full throttle and see what the voltage is.

[millzrm]

I dont have a volt meter, but that will be my next thing to test after I replace the Y Harness. I think I can find someone to help me with figuring out if I am getting the necessary volts.