Kbb 34" mono build

[Make-a-Wake]

Sorry for your mishap.........I just noticed from your rudder pic that your trim tabs are very far inward, and narrow...............that can cause the chine issues. I offer the suggestion to get wider tabs and/or put them farther out..........that where I run them on my monos with no issues. Your tabs(outer edge) only extend about halfway out from the center to the edge of the transom. Mine go at least 2/3's of the way to the outer edge of the tab. My 2 cents........ Hope you get everything sorted out..........hate that happened.

[kfxguy]

Tyler....

The rudder I have is the same one Keith is using. Should be good for this size hull. Yesterday I raised the strut up several times and a good bit too, still chine walked just as much. My trim tabs are pretty short so I may try some different ones. I'm going to put turn fins on it as it's supposed to have them anyway. It may just want a different prop. I'll keep trying. I'm just agitated right now because I'm tired. I stayed out I the shop till 2 am. I was working on a guy's cheetah, the lehner Rivercat and my 4s Rivercat. Then I got woke up early this morning to do yard work. I'm just tired and not in the best of moods.

[Spartanator]

Tyler....

I feel like I am in trouble.... lol

I saw that you raised the strut but I wasn't sure how much. I haven't looked much at your trim tab setup but if they are too close to the V then it will do exactly what Wake Maker said. I have some nice ones from OSE that are for larger builds but they may help you.

http://www.offshoreelectrics.com/pro...prod=ose-83022

If you want me to send them to you so you can play with them let me know. I haven't got the hull yet so I am unsure if they even fit on the transom.... lol

[kfxguy]

I've been reading up on chine walking. Not much info on rc boats. Little bits here and there. Do I've been reading up on 1:1 boats and what they do. Here's some highlights:

1) happens easier in calm water (water was like glass today)
2) longer trim tabs help
3) sometimes more blades on the prop helps
4) angle of trim tabs help
5) slack in steering is one major factor, the main reason a lot of boats do it
6) raising the prop usually helps. In my case it really didn't.


So there's a few ideas for me. I'll get it lined out eventually.

[kfxguy]

I think I'd take about half the distance to the pickup off, make it about 3 1/2"

Why would you shorten it? Wouldn't that make it chine walk more? Here's a side view...

[kfxguy]

Here's what the tabs look like from the bottom. I guess I'm going to order some longer and wider ones.

[Spartanator]

For some reference here is a 11 year old 38' Gun currently for sale with Pier 57:


This one only has twin 525's so I am not sure if trim tab placement differs from a model with twin 1350's or 700's but you get the idea on placement.

[srislash]

Tyler....

The rudder I have is the same one Keith is using. Should be good for this size hull. Yesterday I raised the strut up several times and a good bit too, still chine walked just as much. My trim tabs are pretty short so I may try some different ones. I'm going to put turn fins on it as it's supposed to have them anyway. It may just want a different prop. I'll keep trying. I'm just agitated right now because I'm tired. I stayed out I the shop till 2 am. I was working on a guy's cheetah, the lehner Rivercat and my 4s Rivercat. Then I got woke up early this morning to do yard work. I'm just tired and not in the best of moods.

Travis, trim tabs were the ONLY way I could get my 35" DF settled. I tried everything for the better part of a year to not run them as I did not want the drag but... They were the ticket. These are mine http://www.offshoreelectrics.com/pro...prod=ose-80070
Oh, and no X6 series props.

[flraptor07]

Why would you shorten it? Wouldn't that make it chine walk more? Here's a side view...

Nope, the longer rudder tends to get osilation and flex, and I see something else from that side view. Your rudder looks like it's tucked under, it needs to be at least parallel with the transom or very slightly kicked out. Trim tabs need to be as close to the strut as you can get them, when they are to the outside they do nothing when the boat is aired out. That's the whole point in having them is to adjust the ride atitude and stability when the boat is aired out.

[Peter A]

Here's what the tabs look like from the bottom. I guess I'm going to order some longer and wider ones.

Hi Travis, try swapping the trim tabs side to side. The agled side would be better inside and it will make the tabs sit slightly wider.

[flraptor07]

Another thing is that rounded leading edge leaves a little blunt edge at the bottom if anything you want to round the trailing edge and you can try shortening the trailing edge about a 1/8" and angle it to the leading edge leaving the leading edge alone that way you know for sure the rudder isn't causing any lift. Lift in the rear can cause chine walking.

[flraptor07]

Hi Travis, try swapping the trim tabs side to side. The agled side would be better inside and it will make the tabs sit slightly wider.

Ditto, deffinetly the angled side in...

[Make-a-Wake]

Don't shorten your rudder, I run the LONG ones and they sure make it rock solid. If you decide to swap tabs and move them out you can utilize the outer hole in your transom for the new "inside" hole on the tabs moving them outward.

Here's a pic of my 39" mono rear end, note how the outer edge of my tabs(duals each) are 2/3 of the way out from the centerline of the hull.

[flraptor07]

Don't shorten your rudder, I run the LONG ones and they sure make it rock solid. If you decide to swap tabs and move them out you can utilize the outer hole in your transom for the new "inside" hole on the tabs moving them outward.

Here's a pic of my 39" mono rear end, note how the outer edge of my tabs(duals each) are 2/3 of the way out from the centerline of the hull.

All I'm gonna say is you're not trying to run 80mph, Travis is... Different rules apply

[Make-a-Wake]

There is a point of too much speed, but he hasn't quite reached it..................if anything he needs more stability than I have on mine..........I'm hittin 67, not 30 FYI.

What are the rules.......enlighten me please.