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

[jsturess]

OSE has an upgraded cable AND a new strut with better bushings for the BJ29 coming out in 3 weeks which is a straight replacement of the stock strut. I'll be doing that too.

More info please, pictures?

[jsturess]

Ive got this frome OSE "they have replaceable bushings for a 3/16" shaft"

[macace123]

i glued two magnets up front and cut weights that fit up front and it works well no bounce and still fast. i take pics and post

[hydro_pyro]

If the strut is up high enough (but with no angle) and there's a bit of surface chop on the water, this boat does not bounce, even when it's COG-tuned to fly the bow high. Smooth water is sticky. It needs the chop to loosen it up.

By putting tons of weight forward, you completely circumvent the catamaran design, forcing it to run like a three-point hydroplane instead of a tunnel. Ppfftt...

[tlandauer]

If the strut is up high enough (but with no angle) and there's a bit of surface chop on the water, this boat does not bounce, even when it's COG-tuned to fly the bow high. Smooth water is sticky. It needs the chop to loosen it up.

By putting tons of weight forward, you completely circumvent the catamaran design, forcing it to run like a three-point hydroplane instead of a tunnel. Ppfftt...

The strut height is the deciding factor and the ride pads surfaces have to be trued and blue printed, battery position is secondary and adding more weight in the front is of no consequential effect in the final analysis. Been there and tried that, learned the hard way by not believing what I read from people with more knowledge on these issues.

[AlanD]

Olwarbirds, I'm going to go with your suggestion of the OSE motor mount with the 4082/1600kv / 180 combo. Can you share some closeup pics of how you installed the mount? Did you have to cut any of the stock wood motor support away, and where did you locate the ESC? The wires on the 4082 look pretty short so I'm curious if you put the ESC upfront.

[AlanD]

Jstuess, I don't have any pics, just the email from Steve at OSE stating they are "2-3 weeks out" on the strut.

[Barrel Roll Joe]

I would suggest reinforcing the hull with fiberglass if you plan on running it fast. I have renamed mine CRACKJACK!!!!!!!

[Barrel Roll Joe]

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.

IMG_0048.jpgIMG_0030.jpgIMG_0036.jpgIMG_0042.jpg

I guess I should rename it BlueJack now!

[tlandauer]

I would suggest reinforcing the hull with fiberglass if you plan on running it fast. I have renamed mine CRACKJACK!!!!!!!

Very nice footage, great running boats!
Exact same thing happened to me, same kind of crack, reinforced from inside and in the bow area I poured two-part foam, alot better now. I like your new paint job. I didn't, just found some funky yellow-lime paint and touched up my MG.
Also really dig your rescue boat! Which one is it? I have bad eyes,

[BHChieftain]

If the strut is up high enough (but with no angle) and there's a bit of surface chop on the water, this boat does not bounce, even when it's COG-tuned to fly the bow high. Smooth water is sticky. It needs the chop to loosen it up.

By putting tons of weight forward, you completely circumvent the catamaran design, forcing it to run like a three-point hydroplane instead of a tunnel. Ppfftt...

+1! I have been messing around with my son's new Miss Geico V2. We are running it stock with an x642 prop. I did need to grind the strut bracket slot so I can move the strut up and keep a neutral propshaft angle. I have the batteries back but not all the way-- for our setup the best performance is the edge of the lipo about 1 inch in front of the wood motor "cage". For sport running with glassy water, I still get some bounce, but when racing with some chop, it handles great! I think if I blueprint the sponsons I can improve the bounce on smooth water.

Chief

[Barrel Roll Joe]

Its my buddies not exactly sure what type of boat the rescue rig is but its definitely a life saver. I ordered some of that two part foam but im unsure on how to get it into the bow without making a mess. Did you add a little at a time until it was full? can it expand too much and crack the hull?

[tlandauer]

Its my buddies not exactly sure what type of boat the rescue rig is but its definitely a life saver. I ordered some of that two part foam but im unsure on how to get it into the bow without making a mess. Did you add a little at a time until it was full? can it expand too much and crack the hull?

It really was great to see the rescue rig doing its job. I always had trouble lining up the fork and so I gave up this method and just make sure I tape up well and incase of a roll over, it would hopefully float long enough for the wind to blow back.
As far as the two-part foam, I was concerned that it might crack the hull, but as long as there is escape, it will expand to that space, so, there is really no chance for this to happen because the front under deck is open. What I did was to buy those clear plastic disposible party cup ( glass) , then using my regular mix cups:http://www.offshoreelectrics.com/pro...od=dh-gpmr8056, one cup for part A and another for part B. You reuse the small mix cups with the same part but discard the party glass after each pour. For my first pour ( since i didn't know the expansion rate) , I used half cup from each part. Pour both into the big cup and stir quickly, then pour. You really have less than a minute before you see it expanding. It will help if someone will hold the boat for you straight down, and eye ball the opening of the hull before you attemp your first pour, it takes mental planning ahead. I aimed at the tips of the sponsons first, left and right two separate pours, when that is filled up, then middle, try to maintain a leveled rise . Always wait for the foam to expand fully before the next pour!
The other thing I read is that one should only do this when outside is at least 70* F, I remember someone said that the foam expanded a bit more when outside was hot, I did not experience that because I live in So Cal. The two part foam sold by Kintec is quite good, there was another kind that would do strange things whenever there is drastic temp change: one would see the deck either gets "suck" down or "pop up" .
I would do a search on the Forum and read what others have done.
Cheers!

[jsturess]

Hi

I used this http://www.danalim.com/product-catal...hane-foam-596/ and filled all at once, it expands very little.
Tip, do not remove the Styrofoam piece, I did it and had to do this twice, it keeps the shape :-).

Regards Johan

[BHChieftain]

It really was great to see the rescue rig doing its job. I always had trouble lining up the fork and so I gave up this method and just make sure I tape up well and incase of a roll over, it would hopefully float long enough for the wind to blow back.

Another rescue options that works great for me-- put an eyehook on the back of the transom of your rescue boat an either haul out a fishing line, or tow a tennis ball about 3-4 feet behind the boat-- drive around the stranded boat and either reel or tow back in. I use a traxxas blast as it has very good maneuverability at slow speeds.

Use a drinking straw at the transom end to keep the fishing line away from the prop. In this picture I am using the proboat rescue duck gaff to hook the boat, but a tennis ball works well too.



Chief