Fixing the BJ26 Handling Issues

[PropNutt43]

Finally got around to cleaning up the stuffing box tube at the bottom of the boat. Here's what it should look like after cleanup and when it's done.

BJ Stuffing Box Cleanup 01.jpg BJ Stuffing Box Cleanup 02.jpg BJ Stuffing Box Cleanup 03.jpg BJ Stuffing Box Cleanup 04.jpg

Got another cold front moving in probably won't get to run much this weekend. In the 30s right now and expected to drop with some rain/snow? Crazy Midwest weather. Guess I'll just work on the boat some more.

[caecage]

On one of the picture of the inside of the boat a few posts back showing the on off switch it looks like you coated the entire interrior of the boat with something. If so why and what did you use to do it.
Thanks

[PropNutt43]

I believe you mean this pic.

BJ Remote Switch 03.jpg

What you see is 30 minute epoxy coating the transom at the rear of the boat. I have drilled more than a few holes in the transom and had too removed some of the wood that doubled up the thickness where the turn fins were originally mounted.

Reason for coating:

Wanted to waterproof the areas that were no longer coated in fiber glass. Also to strengthen around the edges and areas where the turn fins and drive hardware are mounted. You can see it better in this pic.

BJ stuffing box tube 04.JPG

[jaybirdtke]

I now have 5 runs on the new hardware and it is awesome with the x642 prop and (2) 2s 4800mah lipos. The only mods that I didn't do is the stuffing box tube relocation, I left the original battery box locations and I haven't installed the external battery switch. I think I'm getting some water in the hull from the inside of the stuffing box tube where the flex cable exits to attach to the motor. I've sealed the antenna hole and I tape the hatch before every run.
Aside from keeping the flex cable well greased how can I reduce water from entering here. It looks like you have some fuel tubing on the inside of the stuffing box tube. Is that what it is?

[dendrobate]

What tape is best used for sealing the lid , any pics .Thanks

[PropNutt43]

Aside from keeping the flex cable well greased how can I reduce water from entering here. It looks like you have some fuel tubing on the inside of the stuffing box tube. Is that what it is?

Yes, I used some 1/8 inch (3mm) silicone fuel tubing. It works great keeps the water out completely. only want about 1/8 " to rub against flex shaft and make sure a little grease gets in it to reduce friction.

BJ Flex Shaft Seal 01.JPG

[jaybirdtke]

Renfrew Hockey Tape. http://www.offshoreelectrics.com/products.php?cat=79

[PropNutt43]

What tape is best used for sealing the lid , any pics .Thanks

This hatch tape from Fullers works great. It's at the bottom of the page.

http://www.drcwebservices.com/ffe/hardware.htm

[jaybirdtke]

I need to replace my flex coupler. Horizon has it for $20.89. http://www.horizonhobby.com/Products...ProdID=PRB3308
I searched Offshoreelectrics but couldn't find one that would fit. Can someone insert a link to a coupler from Offshore that will work?
-----------------------

Steve was nice enough to inform me that I would need the octura 5mm to .150 flex hex. Thanks Steve.

[PropNutt43]

The one you need is on this page but looks to be out of stock right now. Octura makes Two couplers from 5mm to .150 cable. You want the short version (24mm) or you will have problems with the fit.

http://www.offshoreelectrics.com/products.php?cat=68

Fullers site has them too but make sure it's the short version before you buy. I would call to make sure.

http://www.drcwebservices.com/ffe/hardware.htm

[bizzle]

hi everyone. i just recently picked up a blackjack and it had two autobailers installed aswell as a CF45 prop and it was almost un driveable. it would torque twist and almost flip it self at full throttle on a straight line turning was near impossible at any speed. i removed the bailers and angled the fins which helped alot. i took 'er out today along with my SV and DAMN! what a quick boat! in the straights it would rip past my SV with a CF48, i took great care in the turns but did flip her when i came to a stop then attempted to turn from a dead stop..hit the throttle about 1/3 and over she went faster then i knew what had happened.

im going to lower the batteries tonight but can anyone tell me which angle the set the drive to to possible help? up or down?

[PropNutt43]

Have a look at this thread, it should help you out with prop angle and drive set up.

http://forums.offshoreelectrics.com/...ead.php?t=3105

Definitely lower the batteries and put the esc at the bottom of the hull too, if it isn’t already there. Every little bit helps.

Sounds like you bought a modified version of the boat. Some pictures and more info would help.

[bizzle]

no, the only mods were the auto bailers that had about a 1/4" difference in height where they were drilled into the transom, a spektrum hi torque servo and a 3" pink antenna tube. Then there was the mods UPS put into the hull in shipping...separated the front end halves, destroyed the stock prop and put a nice crack on the top of the hull. pics would be nice huh! i cant find the damn charger for the camera. ill look for it today. i gotta take pics to put in a claim w/ UPS aswell

[PropNutt43]

Sorry to hear about the damage from shipping. Hope you get a new boat out of UPS or at least a hull and prop.

I thought the boat might be modified because of the way you said it was torque twisting on a strait line. Was thinking maybe too much motor.

But if it's all stock the prop maybe angled up too much at the back, or too high above the ride surface which would also explain the boat wanting to blow over.

Try straitening the prop angle out first and if that doesn't fix it lower the drive a 1/16 inch at a time till you get the result you want. The boat might lose a little speed but should become a lot more stable.

As far as steering with the stock drive hardware, my boat didn’t turn well at very low speeds or high speed. It liked it best some where in the middle. Also turning the duel rate down on the radio transmitter helped by not allowing the boat to turn too sharp.

[bizzle]

ok, update on my situation.
I took the BJ out this AM.
tried adjusting the trim angle with negative results on moving it down. for every slight angle adjustment i also tried moving the batteries fore and aft. So far it ran best with no turn fins prop angled all the way up and batts about 3.5'' back from stock. This improved turning ability but she still lists to one side and with 3/4 to full throttle she just starts turning leaning harder and harder. Im thinking maybe the CF45 prop might have somthing to do with it, all the props in your guys pics have a much deeper pitch the blades are more horizontal.?

when i bought this boat i envisioned dual counter rotating outdrives. would that fix the twisting problem do you think? Has anyone else had this or similar problems with their BJ26?