BJ29 Pilots, what is your setup to avoid the bouncing?

[olwarbirds]

Hear all of ya on the cracking hull issues...my buddy hit something submerged with rudder and the transom busted out and we got hull seperation issues happening now too....BJ is being stripped and re-done...going to make a transom doubler out of some hardwood, them I'm going to lay CF throughout the hull....probably going to layout inside of hull differently too...Yes ESC in front of the Motor, trying to keep wire runs as short as possible...We are NOT in anyway dissappointed with the BJ29 hull...this boat has taken some serious abuse...I'm impressed that the hull hasnt shown more damage considering some of the 65mph plus tumbles its taken... DJ

[onadskee]

Blackjack 29 strut set up

[QUOTE=MAMBA2200;472742]These hulls are good at bouncing you will find that a cat hull will be smooth then bounce and then smooth out again once you get fast enough. What i have done to calm mine down is set the strut about 1mm above level and angle it down about 1mm. But what you must take into consideration is that no matter how hard they try every hull is different so it will be different for every boat out there on setup. So try to use my setup and see if it works for you it might it might not but it is a starting point. Hope this helps you[/QUOTE

Hello hope you ok, can you please explain when you said you set the strut up 1mm above level then angle it down? How did you do that? I can only raise the strut up or down but not sure how to angle it down. Thank you.

[hydro_pyro]

There's a bit of wobble in the strut that should allow a little bit of thrust angle adjustment, as well as the ability to change its vertical position. Put the boat flat on a clean table and raise the strut up until there's a 1mm gap between the strut and the table surface, and angle the strut slightly down as you tighten it. This will give you maximum stern lift to minimize the bounce. I think mine is set even higher than this.

You may need to grind and egg-out the mounting hole bigger to get the position you want.

It helps to have a friend tighten the screw while you hold it in position.

[Barrel Roll Joe]

Hey DJ I'm running the 4082 2000kv and I'm noticing my battery life has been cut in half or less do you have the same issue? Should I play with the timing to improve this maybe?

[tlandauer]

There's a bit of wobble in the strut that should allow a little bit of thrust angle adjustment, as well as the ability to change its vertical position. Put the boat flat on a clean table and raise the strut up until there's a 1mm gap between the strut and the table surface, and angle the strut slightly down as you tighten it. This will give you maximum stern lift to minimize the bounce. I think mine is set even higher than this.

You may need to grind and egg-out the mounting hole bigger to get the position you want. It helps to have a friend tighten the screw while you hold it in position.

That is exactly what I had to do, the little wobble allows the strut to have the negative thrust angle you need while setting the strut high. This is seldom mentioned on these posts when people ask how to raise the strut ( correctly)!

[AlanD]

I just did this with the stock flex cable and strut, and when I angled the strut downward, it placed pressure on the joint on the shaft cable where the flex and solid parts are joined. My stock flex cable is badly aligned and the negative strut angle exagerated the problem.

So, when angling the strut down, be careful of any added friction you might be placing on the flex cable so you dont add excessive load the motor and fry it. You want the base of the strut angled slightly down relative to the hull but make sure the flex cable housing is in alignment with the base of the strut too.

I hope this makes sense to readers.

[macace123]

can anyone post picks of the back of there BJ29s i still cant get my boat tuned right

[lenny]

Post some pictures of yours and where you are placing you cell to,
Than may be we could help you with how it runnig.
Have any video's of it running to see how it is riding for you ?

[Scaler15]

Not quiet the right topic but... I am ordering my first rc boat this weekend. I am still stuck between the blackjack 29 and the impulse 31. Ill be running them on dinogy 4s lipos in parallel. I will be running at a lake woth mostly calm water but choppy in some spots for ome fun. Is there any huge differences between the boats, will the v hull give me a better run time? If you guys have any input on which model i should choose i am wide open for opinions!

[macace123]

i will post pics and videos for you to look at this weekend lenny. Scaler i say BJ29 it all around halls ass.

[Scaler15]

i will post pics and videos for you to look at this weekend lenny. Scaler i say BJ29 it all around halls ass.

Thanks macace!!! Do you think there is any noticable runtime differences between the two??

[macace123]

no my impules rips just as fast bj29 handles smother run times are about the same.

[ray schrauwen]

So you got that deal on Ebay huh? Nice Score and nice paintwork!!

The seam that runs around the middle of hull is joined together with the weak epoxy that they use to hold down the battery trays. I glassed the inside of hull and relocated the water outlets.

[ATTACH=CONFIG]96814[/ATTACH][ATTACH=CONFIG]96815[/ATTACH][ATTACH=CONFIG]96816[/ATTACH][ATTACH=CONFIG]96817[/ATTACH]

I guess I should rename it BlueJack now!

[Scaler15]

Thank you guys so much for helping me! I just ordered the blackjack 29 cqnt wait to start running it!!!!

[macace123]

just make sure you change the esc an motor connectors to 5.5 the stock connectors with blow solder all over the place i learned it the hard way. and sharpen the stock prop and it will scream. have fun with it i do all day