New BJ Owner without maiden voyage

[snaychev]

This is so nice ! I followed "tiqueman"s advice and removed turn fins.
What a surprise
Way better control at all.
Now i can make turns in wide open throttle without slow down every time .
Thank you friends

[tiqueman]

Yesterday was a great day for the BJ. I moved the cog back a little bit, made a strut adjustment and cupped the prop a bit. She ran 42.7mph from what was 40.1. Super happy with it.

x642 detongued and cupped
(2x) 2S 5000mah 40C Turnigys
OSE hardware
no turn fins
stock motor/ esc w/ UBEC
No tuperware
lowered batt trays
extra flotation
epoxy laminate hatch

Ok thanks, my timing is set to high vs yours at low, I guess i'll keep playing w/strut, prop,and cog and see what I get.
I'm running 5000 mh 40-50c lipos
stock motor,esc
lowered trays
x642 prop
no tupperware
speedmaster hardware.
why I cant reach 40 mph I havent figured out YET !!!!!!!, but I will

Wheres your strut and hows it set (ie neutral, neg, pos)?

[tiqueman]

Snaychev, per your PM request

Just has a slight kick of positive and the strut is as high as it can go in the factory slot. This position on a S/B/DT and C x642 produced 42.7mph. The picture actually shows it a tad higher as I elongated the strut adjustment slot, but I lost some mph so it has to be moved back down.

[snaychev]

Thanks a lot mate
Will change my setup as yours and will try asap.
But as i can see from the picture , you have some kind of bushing out of the strut (between the strut and the drive dog ???) What is that made for?
In my setup the drive dog is exactly after the strut?!?

[tiqueman]

No bushing or anything there. I think your just looking at the shaft. I see in your picture you do not have that gap. Make sure your running a few mm gap between your strut and the drive dog. This gap allows for the cable to "wind up". Looking at yours, as the cable winds, its pulling the drive dog into the strut and going to cause a lot of unwanted friction and rob you of speed and power and eventually something will fail.

[snaychev]

No bushing or anything there. I think your just looking at the shaft. I see in your picture you do not have that gap. Make sure your running a few mm gap between your strut and the drive dog. This gap allows for the cable to "wind up". Looking at yours, as the cable winds, its pulling the drive dog into the strut and going to cause a lot of unwanted friction and rob you of speed and power and eventually something will fail.

There is a 1,5 mm gap with 1 mm teflon washer between the strut and drive dog.
Everything is moving freely at WOT under loaded prop.
Thanks again mate.

[tiqueman]

Awesome.. no need for the teflon washer. You can ditch it

[snaychev]

I just came back from the lake
She is flying
Big thank you to "tiqueman" for the information.
Just two clicks to the positive angle and it is a totally different boat. But today i realized that if i keep WOT in all the way turning (does not matter left or right) she is stable as rock solid Water was perfectly calm like a glass.
And last of all i made a cover for the hull

[tiqueman]

Glad to hear yo got it all worked out. They are pretty fun boats once you get all the faults out of them.. Still not perfect.. but much more fun than out of the box. You will find that when running w/ someone, it will want to roll over now and again... Ive found if Im running against another boat, if I move my cog just a tad forward, it will help it stay planted.