Fixing the BJ26 Handling Issues

[kookie_guy]

the tunnel is smooth only the sponsons are stepped and this is not the hull to copy it has many short comings in design that I will hopefully be working out soon

ya he asked about the sponson steps.

[Jesse J]

what are the things that are not good about the BJ hull?

[rockwerks]

what are the things that are not good about the BJ hull?

bottom of the sponsons too narrow, steps not needed, hull should be rounded on the outside of the sponsons not square....................an a few other things. Before mine hits the water Im going to be reworking the hull a bunch

[pulser]

TRUNKMUNKY'S Sponson Mods

[QUOTE=TRUNKMUNKY;37823]For the hull mod I added a couple pieces of ply to cover the last step on the rearmost sponson,with good results]

Hey Trunk, was wondering if you might go into more detail about how you attached ply to the bottom of the boat. Any pictures would be great. Your Vid looks like she corners on rails! Is that the only handling mod you made? Thanks.

[rockwerks]

[QUOTE=pulser;50939]

For the hull mod I added a couple pieces of ply to cover the last step on the rearmost sponson,with good results]

Hey Trunk, was wondering if you might go into more detail about how you attached ply to the bottom of the boat. Any pictures would be great. Your Vid looks like she corners on rails! Is that the only handling mod you made? Thanks.

The pics are in this thead.

[Jesse J]

A few have filled in the rear step on the hull full width. which has a big improvement on cornering stability but also has increased the drag substantially. My thought is to give it more of a tunnel hull at the rear and only fill in the flat portion of the rear step. It might be a happy medium.. the picture has the area boxed in on the rear of the hull .thoughts?

Is this what you were referring to as pictures in this thread? Have you had a chance to see how she runs? How wide is that boxed area you show?

Also, what do you mean by rounded instead of square? where?

Anybody have any reason why not to get the OFE strudder instead of Fuller's cat hardware? Anybody tried a wire drive instead of flex?

[rockwerks]

Is this what you were referring to as pictures in this thread? Have you had a chance to see how she runs? How wide is that boxed area you show?

no, that is actually exactly what Im not going to do LOL.

http://s228.photobucket.com/albums/ee126/john_watkins1/

pics of what several have done to make the hull turn better and get up on plane quicker

[Jesse J]

Hey Propnut, what were the dimensions of the three colored arrows in post #117? I am considering constructing my own hardware using a wire drive instead. I may just manufacture me up a bracket for my Wholt's strut and monster rudder. The dimensions you found successful would be extremely helpful!
Thanks

[Jesse J]

Rockwerks, dang, rounded hull; quite counter-intuitive. I guess I am a chine-man and am going to be incorporating a second lift-strake acting as a chine along the outside. Got any vid of how your mods perform? Does the roundness help bank her over? or how does it help. I noticed you canceled out the second step, why?

[rockwerks]

Rockwerks, dang, rounded hull; quite counter-intuitive. I guess I am a chine-man and am going to be incorporating a second lift-strake acting as a chine along the outside. Got any vid of how your mods perform? Does the roundness help bank her over? or how does it help. I noticed you canceled out the second step, why?

Ive been talking to a few old guys in the sport and hull designers. because of the cat design the steps are counter productive (in our small versions) because the steps break up the turning edges (the inside sharp edge of the sponsons). The sharp edge on the outside of the sponson can unbalance the boat. digs into the water. (or so Im told. Im getting ready to move in a week to Washington and wont have time to complete the hull till after the move

[PropNutt43]

Hey Propnut, what were the dimensions of the three colored arrows in post #117? I am considering constructing my own hardware using a wire drive instead. I may just manufacture me up a bracket for my Wholt's strut and monster rudder. The dimensions you found successful would be extremely helpful!
Thanks

I didn't post #117 but here are the measurements I got.

Red arrow 2 1/4 inches

Green arrow 3/4 inch

Blue arrow 2 1/8 inches

[Jesse J]

Thanks, I wasn't implying you posted, I noticed that someone asked the same question and am quite interested to see what you had. Since you have been so helpful with much advice, I am glad you have also provided these tasty little morsels of information!

Have you (Propnutt) had similar handling issues as rockwerks has alluded to? It sounds like you have had yours out quite a bit and you haven't made any mention of this potential handling issue.

How deep have you been running your rudder? I see the strut bushing is pretty level with the base of the sponsons, where I'd imagine it to be good.

Thanks again for so much empirical information!

[hex-dj]

About handling hardware.Everyone : I just noticed that Twisted Liquid Racing Co. at www.twistedliquidracing.com has stopped production of all their aftermarket hardware products for the rtr boats including the BJ 26. They had too many problems. Eventualy they may have to shut down everything. Too bad.

[PropNutt43]

Have you (Propnutt) had similar handling issues as rockwerks has alluded to? It sounds like you have had yours out quite a bit and you haven't made any mention of this potential handling issue.

How deep have you been running your rudder? I see the strut bushing is pretty level with the base of the sponsons, where I'd imagine it to be good.

Thanks again for so much empirical information!

I'm sorry but have I entered the twilight zone! The title of this tread is Fixing the BJ26 Handling issues. Please read through the whole tread before posting questions.

And incase you missed the video link in post #75 here is how she handles with no mods to the bottom of the hull.

http://www.youtube.com/watch?v=Mqv1GBGQfKc

The Bottom of Prop shaft is about 1/8 inch above the bottom of the hull with just a little positive angle in the video.

[rockwerks]

I'm sorry but have I entered the twilight zone! The title of this tread is Fixing the BJ26 Handling issues. Please read through the whole tread before posting questions.

And incase you missed the video link in post #75 here is how she handles with no mods to the bottom of the hull.

http://www.youtube.com/watch?v=Mqv1GBGQfKc

The Bottom of Prop shaft is about 1/8 inch above the bottom of the hull with just a little positive angle in the video.

ya mean he's supposed to read the WHOLE THING!!!!


nice mods, Im going to go a step further in mine when I get the chance, Im going to narrow the center tunnel to widen the bottom of the sponson