Help Me! Please!

[skyword]

Need some advice on what to try next to smooth out the porpoising!
Stock motor
Stock esc
2x 7.4 30c 5300 mah Gens Ace lipo's
Prather 220 prop.
Kintec offset rudder.
CG is curently at 9 1/4 from Transom. (End of sponson not the overhang)
Prop depth - centerline of prop shaft is even with bottom of sponsons.

I have tried prop depths higher and lower by 1/8 incements up to 3/16ths with not much diff.
Have tried CG at 9 and 8 3/4 with no difference other than 9 and less seems more pronounced and acts like it could blow over.
It will run at 3/4 throttle smoothly but WOT constant bounce. It will stop in a wide open if you have it in a slight turn. 10 degrees maybe!
Don't realy want to run it in a circle all the time! I do enough of that myself!
Any ideas or other things to try would be much apreciated!
I'm enjoying this boat but the wawawawa is anoying. A guy showed up at the pond with a BJ 26 and it ran smooth. He did barrel roll it once though! Luckily landed bottom down and kept going! My MG and his BJ were dead even but if I could tune out that porpoising I think my MG would be faster! Less anoying for sure!
Thanks in advance for any help.
I know there are threads devoted to this! I've read most of them!

[Make-a-Wake]

I'm in the same boat(LOL)..................my Mystic runs like crap at every setting................hopefully someone will chime in.

[dana]

try raising the strut all the way up?

[Diesel6401]

What helped me with my MG was getting rid of any and all excess lift. I ran a prop with a low pitch. When the prop has lift it forces the transom up to much and then it hit the steps and start loading and unloading "bouncing". Next I got rid of the wedge on the very bottom of the rudder, I rounded it and rounded the lower leading edge of the rudder. The best combo I had with that boat (before I sold it) was the PB1800 the kintec v2 offset and a grim 40x52/3. That worked excellent for me. The packs where hanging back around 9" cg or so I forget and I forget the strut depth. Getting rid of the excess lift is what def helped mine though, and constant tuning. A nice 90 on the last step may also help as well.

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[jasoncyclone]

Have you tried changing the angle of the strut? Is it neutral right now? If you can get some pics from the side of the hull looking at your strut we might be able to help. I see tons of people with this same issue but it seems that no one changes the angle of the strut. Moving the strut up and down are only 1 of the adjustment that can be made with the strut!!!

[dana]

I agree with diesel, try a different prop for starters. Sometimes a change in prop will change how the boat rides

[skyword]

Thanks for the replies everyone!
Jasoncyclone -I have tried to get the prop to point down but am afraid of kinking or bending the stuffing tube.
Dana- I have not tried the strut all the way up but have considered it. I'm thinking it my cavitate to much but if it hooks up and helps the bounce then it would be worth it to me!
I do have a x642 waiting at my LHS to pick up when I can make it over there! I will need to S&B it myself! Is Berylium really as hazardous as they say? Or only in California? Ha!
Diesel-I was wondering about the lift in the back caused by the prop! I read where some create more than others. The x642 has a little less pitch than the P220 I think.
Thanks again to all for the help! Will try to post pics!
JJ

[dana]

Make the bottom of the strut 3/16 higher than bottom of sponsons. X642 has some lift, 1.6 octura props inherently have that character. Try an m445 or m440. I like m props on cats. They work well. 1.4 series octura have very little lift opposed to 1.6...

[Make-a-Wake]

Yeah, as Dana pointed out, the 642 is a medium lift prop as opposed to the x4 series which is low lift. The 642 being a 1.6 pitch also has more pitch than the Prathers which are roughly 1.5.

[joker rc]

mine skips a little only in straight line ,then seems to smooth out as it reaches top speed .if i turn even the smallest amount it runs dead flat , i am hoping its just the hull ride pads ,after i fill them will see ,

[joker rc]

well i tweaked the strut and tested it today ,no more bounce , running dead flat , move your strut till its level with your ride pads ,then tweak it down at the back a little ,few degrees . like this photo shows the top of the strut you can see how much angle i put on it ,. last photo show what it was set at ,level before a tweaked it
IMAG0161.JPGIMAG0160.JPGIMAG0147.JPG

[jasoncyclone]

Thanks for the pictures Joker... That was what I was talking about with the strut angle.

[skyhighdiver]

Also try moving up to 2 14.8 packs the boat likes the extra weight smoothes her put and you almost double your run time

[joker rc]

yeah i just purchased some 4500mah 5s zippys 45c they will settle it down 650 grams each .over my 2s zippys 308 grams each . more top speed ,less WOT 9000mah long run times .it seems the 42x55 prop was not pushing the motor temp up to much mine needs more prop on 4s . or 5s
5s will be interesting , and a x642 might be better on 4s ,or m445 like your running ,

[skyword]

I decided to angle mine down but had a hard time getting it to move. My stuffing tube is a little long I think! I added a 3/32 gasket between the transom and the strut mount and this gave me a little extra room to get an angle on the strut. Hope this will get the bounce out of my boat as well. Won't be able to test for a few days.
Thanks to all for the replies and help!IMG_0012.jpgIMG_0013.jpg