single rudder?

[ARMYCOUNTRY43]

Thinking about getting a Jimmy white square nose 13-7 putting a 0360 on it thinking of using a single rudder trying to build it like my dad in the early seventies just wondering how it would drive compared to duals

 

[Gary S]

Depends on how big a rudder you put on it.

 

[Slidin Gator]

I run a single rudder setup on a Stossel hull. The rudders are 4 feet tall and 44" long, but true airfoil shape, which is roughly a 10:1 aspect ratio (4-1/2" thick). The rudder generates lift on the outside that drastically improves turning forces, it will actually pull the a$$ end sideways when applied. The true airfoil shape vs. the sharp nosed fake foil stuff is a key element in the steering authority.

The key issue with the large single rudder is windy days, invariable it's always a side wind. I have stopped and trimmed my trim tab to take the load off when I have a long run with a side wind, then reverse the setting on the way home. I am not very familiar with the Jimmy White, but I think it's a glades sled (??). The round bottom Stossel hull tracks well, I would be concerned about being able to fight a side wind with a flat bottom sled. In the sled situation I would opt for dual rudders, but true airfoil shape with top and bottom plates (the plates act like winglets on planes to hold the air on the rudder). It will double your steering authority vs. pancakes.

 

[ARMYCOUNTRY43]

This is a Jimmy white square nose that I found on the internet the rudder that I found is as you describe it's real thick at the back of the cage and gets narrow as it goes back and probably is the measurements that you gave I guarantee it will turn you like you said

 

[ARMYCOUNTRY43]

The boat in the picture is like one my dad had when I was a small boy I would like to try to build one like he had back then

 

[Slidin Gator]

... the rudder that I found is as you describe it's real thick at the back of the cage and gets narrow as it goes back and probably is the measurements that you gave I guarantee it will turn you like you said

Post a pic or two, particularly the forward/prop end. It has to be rounded at the front, no break or point.

I would like to try to build one like he had back then

I ain't gonna talk you out of it for sure, I love my single rudder setups. About 11:00 am, when the grass get's tall, hot and sticky, that's when these big ole rudders shine

 

[ARMYCOUNTRY43]

This rudder belongs to someone else but it's the only picture I can find online that comes close to what I'm looking for

 

[Gary S]

I have felt my rudders hitting stuff when turning sharp going back to get a frog. And I have 42 inch rudders.

 

[ARMYCOUNTRY43]

With a 42-in rudder I bet it turns on a dime and gigging frogs is what I plan to use the boat for I appreciate everyone's help and advice

 

[ARMYCOUNTRY43]

What size sensenich prop how many blades would be good for that motor

 

[Gary S]

5 blade excaliber on one and 2 blade whirlwind on the other. excaliber is 70. two blade is 68.

 

[ARMYCOUNTRY43]

I would think the Excalibur would be too big I was thinking along the lines of the razor x

 

[Rainwaterou812]

i run a 70inch 5 blade saber on my carbureted 0360 lycoming @ 7 degrees on a Philips step hull

 

[ARMYCOUNTRY43]

I appreciate the info I will try more than one prop to see what works for me I guess I'm looking somewhere between push and speed not sure it can be found don't really need speed but don't want to go slow

 

[Slidin Gator]

don't really need speed but don't want to go slow

You gonna have to make up your mind.

My present 300 Hp boat with a wide blade 72" NGQ will make 60 MPH in the right conditions (running solid tall sawgrass). 99 MPH is my max in the same conditions, but running a 260 Hp lycoming with a 6 blade 70" Warpdrive.

and gigging frogs is what I plan to use the boat for I appreciate everyone's help and advice

If froggin is your primary goal, the choice is simple. What kind of Frogger are you? Do you hammer em on a plane or idle around?

My 20/15 eyes are long gone, so I'm an idler. I like a setup that idles strong and jumps without too much throttle. I have the idle turned to good froggin speed and can touch the throttle when needed to turn around. That's one of the places a wide 2 blade setup shines, thrust off part throttle. The big ole rudder don't hurt either (where the hell is Garry Frogging? I hit stuff in the Cyprus for sure, but get my frogs in the grass).

If you are a hammer em on a plane kind of guy, I would look seriously at these modern swept wing multi blade props in a 68" max. Such a setup will work the best when on plane with any kind of water (or slicker stuff like saw grass). You will get the best throttle response and maximum speed. The tradeoff will be running higher RPM in the midrange and less max thrust on the trailer.

 

[ARMYCOUNTRY43]

I would say I'm more of a idle around thanks for the advice

 

[Slidin Gator]

I would say I'm more of a idle around thanks for the advice

Sounds like a 68" 2 blade is what you want for that O360. Blade width (10-12) becomes a minor choice on the same scale.

 

[Gary S]

I idle when the frogs are thick, and frog on a plane when they are not. And I'm not talking about tearing the rudders off the boat, just feeling stuff hit them hit them. I think it's sporty to get them when running in at cruising speed. I admit I don't get as many at that speed but I am usually done by that time.

 

[kwanjangnihm]

I idle when the hot chicks are on the point and on plane when the heifers are out!

 

[ARMYCOUNTRY43]

HmmmmDon't know