Why does a boat "spin out"...............need advice.

[ksaucerman]

On a 32" boat 125oz is fine. I run 150oz servo on 50" gas boat going 70mph without a problem. I don't think servo torque is the problem. I would check strut angle, battery placement, and rudder angle.

[lectriglide]

Is it? I've convert 15kg to oz, its 500oz not 270oz

Actually it is 208 oz/in

[Make-a-Wake]

Yep, 205 for 15kg according to my neat little chart too.

This is real handy for anyone converting length, weight, torque, area, volume, and temperature...........i use it quite often:

http://www.towerhobbies.com/help/convcalcs.html

[Chilli]

How about sending us a picture of your hull and transom hardware.

[cuppa]

How about sending us a picture of your hull and transom hardware.

A great suggestion from Nautiboyz. 'Spin out' can have several causes and a picture will help the experts on this forum offer you informed suggestions and advice.

I am by no means an expert and there are many with far more experience of setting monos up than I have but some years ago I raced a challenger that suffered badly from both 'Spin out' and 'Chine walking'. The problem was my set-up and not the hull. With the help of some of the local club's experts I was able to get it set it up correctly and it ran quite well in the end - setting it up to run properly also helped me to gain a very basic experience in 'dialling in' a mono hull.

[Jesse J]

Get big ones! I had that problem with my AM XXX until I got biiiig fins. Jay calls the ones you have on there now "p mono turn fins". Mine are over 3" and really wide.

I agree on the servo, run yours on 6V if you aren't already, reinforce your servo rod with cf tube - sometimes those can flex. Also decrease your servo throw to "just enough"

[Make-a-Wake]

The boat is my 47" Mono in my signature, love everything about it except for the tendancy to spin out when turning "just too much" i guess.

Jesse, Im in the process of fabricating some fins right now. What is your opinion on rudder area? Too much = bad, too little = bad............etc............ My cog is around 31%.

Here's my big question to all, is the rear sliding or the front area of the hull "grabbing" in turns

Here's a pic of the boat rear, and the new rudder i made, a whopper at 8 inches long

[Rumdog]

Is it hooking? Cog too far forward or a prop with too much lift will cause it to hook and spin out. I'd get a better servo too. Those turn find should be plenty big. How far is the stinger from the bottom of the ride pad?

[Make-a-Wake]

Thanks Rum..........the stinger is actually "up" a tad more than i wanted originally, but it worked out well by keeping the butt planted at speed.......running an x460 now.

In regards to hooking, that sounds more like what it does, its not skidding out, its really biting and doin' a 180 on sharper turns.

[Rumdog]

Try adjusting the stinger positive a degree or two, or the tabs. My bet is the tabs are forcing it to nose in too much when it's banked over for a turn, then it bow steers and hooks. Try one or the other once at a time. Also, are you running no gap between the drive dog and strut??

[Make-a-Wake]

Running about a 4mm gap for flex shrinkage.................

[Jesse J]

Ya rudder looks good. My problem with stingers is that you have to change the angle to raise the prop. I would take off the stInger and make a wet well and regular strut. A big boat needs the flexibility of being able to raise and lower strut while changing props or even water conditions. It is actually pretty easy to make one. I know mine really liked the bigger fins and if you went bigger you could eliminate that variable.

[carlcisneros]

Make-a-wake;
First off, please try the NEW RUDDER BLADE that you made.
make sure and install a new warter pick-up for cooling since that new
blade does not have pick up capabillities.

Then let us know how that went. OK?

[Make-a-Wake]

Thanks guys...........

[Make-a-Wake]

I just got back from Running big yellow and here's what i did:

Lowered the turn fins and tucked 'em a little, tucked the rudder a bit(speedmaster 6.5") and moved the cog back from 29.6% to 28.2%, and lowered steering rate even more.

It ran very well and i had the usual looky loo's stoppin' on the road for a peek. Ran the x460 which is low lift and it went well, made larger sweeping turns due to the larger lake area i was in. I tried to run a course that resembled a true racecourse and only one time did it try to spin when i had to cut tight due to the shore moving in towards it quickly..........those darn shores.........

So.........it still has been a plug and play with the 2028 and Swordy 240, came in cool although the water temp is probably 50. Thanks for all the replies.