33" Fountain Setup Issues

[scooterP]

I've thought about the flooded chamber. For now, I will slot it and fill in the opening with some epoxy and see how it works out.
I would love to see the pic of you setup on it. How far up would you suggest moving it? Right now I would say that it is 1/8 of an ince up from keel at the most.

[crabstick]

im not too good with inches, but i thin 1/8 is about 3.5mm ?

Personally id have the bottom of the tube about 5-6mm up from the keel, Thats how I did my oval master 26 and it turned well and won races. , it even turned right reasonably well, but I didn't have a turnfin on that side

[scooterP]

I got ya. I'll make the move tonight and give it a test tomorrow if it's not raining and let you see what I come up with.

[Scott T]

Turn fins can also affect trim, especially in the turns. The more perpendicular they are, the lower the nose will be/the tigher the boat will be. The more angled back, the looser the boat will be.

ScooterP, did you try adjusting the turn fins as above? I've definitely seen big changes in mono handling by just moving (rotating) the fins forward and back. I'd suggest trying yours with the trailing edge of the fins vertical (if you haven't already).

[DISAR]

Silly question, but have you tried the boat without the turn fins? I do not use them.

[scooterP]

Hey,
I have adjusted the turn fins to about every angle I can think of. I have also flipped them all the way up which is effectly removing them from any contact with the water.....It was worse then.
Last night I moved the exit point of the drive up about 4mm. I'll shoot some pics when I get a chance. I'm going to try to sneak out to the pond at lunch time and try it out. Maybe this will bring the rear down some and solve the problem.
I'll post as soon as I have some results. Thanks again guys for all of the suggestions and comments. I really appreciate them.
Phil

Edit: I don't use turn fins on my DF clone 26" mono. It goes through corners without letting off of the throttle.......really spoiled me.

[scooterP]

I have adjusted the turn fins to about every angle I can think of. I have also flipped them all the way up which is effectly removing them from any contact with the water.....It was worse then.

I have to admit when I am wrong or just talking out of my a$$. I did the turn fin thing with another boat I was messing with a while back. I got to thinking about it and I did not try this boat without the fins.

Long story short...... I tried the boat with the higher exit of the drive and it did do a little better. The most significant change was when I raised the turn fins up until they could not touch the water in a turn......NIGHT AND DAY difference. I couldn't believe it!!!

I ended up flipping the boat from going too fast in a turn without any fin. It does need a little fin at higher speed, but the skipping is now virtually gone!!! Now I don't know if I should lower the drive back down or not. I can tell it takes longer to get on plane now, but it's not a big deal to change. I may just leave it as is for a while.

I want to thank everyone for their massive amounts of help that was given to me on this. It still needs some tweaking, but since the source of the "hop" has now been found, things will go much easier.

[scooterP]

Well guys, it wasn't as night and day as I stated. I just got pretty excited when I could tell a noticable difference. It still does some hopping in the turns. Just thinking out loud here, but wonder what it would do with a shorter rudder? I would think that a shorter rudder might result in less lift on the rear. Just some thoughts.

[crabstick]

got a video of the boat doing 'the hop' ?

[scooterP]

got a video of the boat doing 'the hop' ?

I was just talking to my wife about her shooting the vid for me. I held the camera and piloted the boat at the same time on Friday. I just couldn't shoot the vid zoomed in enough to see the hop. You could hear it though.... I also don't have a "video site" set up to upload videos to. Honestly, I work with pc's all day in the "do everything" IT job that I have and don't really care to doing stuff on the pc unless it's to check out the forums...

I tweaked it some more today and it's not doing too bad. I set up some exponential on my steering and cut down the atv's a little bit. I can ease into the turn and keep speed if it's done nice and smooth. I also zeroed out all of the trim tabs and solved some straight line hopping with change of CG. I then adjusted trims for ride attitude.

I took the fins out of the picture and tested again. I found that you have to have some turn fin or your turns will be super wide. The boat will just slide sideways across the water without the fin to help grab......I wonder if lengthening the chines a little would help........

I think that I'm going to move the drive exit down a little as well. Probably in between where I had it initally and where it is now. It didn't improve turns very much, but it did hurt my speed a little. Before the move I was at 46-47mph and now about all I can get it 43-44mph.

I'm getting closer, and learning a helluva lot in the process. That's what it's all about for me. Thanks again for all the comments/suggestions.

[D. Newland]

Scoot-I got it done. Here are some final shots. I should have it out this weekend. I'll sort it out with a UL-1 motor and an X442, but the hull may be too big/heavy for racing the P-Limited class with that setup. If so, I'll either tune it further with an 8XL or hotter P mono motor, or set it up for my kids to race in the kids class out here.

The 2 part foam I put in it turned out good, but it's heavy...you can see a tiny bit of it on the right side in 1 of the shots. I should have test-poured in a dummy boat first to get a feel for the expansion and the time you have to work with it (which isn't much time!).

[scooterP]

Looks good. I have been playing around with the cg on mine with some suprising results. I've also learned how it likes to be driven a little.
I see you have your motor further back than mine, I think your setup is better with managing the cg. This boat seems to like a further aft cg than what I read is the "norm" on that.

One other thing I found with the ride pad is that it loves to have turn fins to do anything crisp. Mine will literally slide across the water sideways if I pull them all the way up.

Let me know how it handles for you. I'm running an 8XL in mine and can squeeze 46-47 out of it with a 4s2p setup.

[D. Newland]

Did you take off your "temporary" ride pad fill in job?

I've got the cog at 10" right now, which is 31%. However, a ridepad will allow a further back cog. Do you know your cog measurement?

[scooterP]

I did take the temporary ride pad off. I had my cog at about 31% initially, it's futher back than that now. I don't know what it is off the top of my head, I will have to measure this evening and get back to you.

[scooterP]

I had to take a break with the Fountain for a little while........I actually had a fet burn out on the ESC. I took my DF 25 clone off the shelf and man I have to tell you, it's a nice handling boat. I'm running the SV27 esc, XPower 540 12L along with a Octura Y536 prop. Running a with a 4s2p setup I can get a solid 44mph out of this machine and you never have to let up in a turn!!!
Just had to have a break from the tweaking, but I will have the Fountain back in the water Wednesday for more tweaking. It's nice to take a break sometime and just enjoy.