The White River in Southern Indiana is very similar to what you are
describing and I've never had any problems. More trouble than it is
worth in my opinion.
Marquis
Ken Roberts wrote:
> On Aug 2, 1:26 pm, Marquis Songer <marquisremoveson...@[EMAIL PROTECTED]
>
> wrote:
>> 3 rudders is plenty with a single trim wing. Trim wing is helpful in
>> some cases even with only 22 hp for thrust that I use in my setup.
>>
>> My pulleys are 6.25" & 12" and with a 54-50 prop I get around 3450
>> static rpm, and as much as 3700 at speed. I'll try to remember to
>> measure the length & width of my rudders & trim wing when I go to my
>> shop this evening.
>>
>> Marquis
>>
>> Ken Roberts wrote:
>>> On Aug 2, 9:48 am, jas...@[EMAIL PROTECTED]
wrote:
>>>> I have removed my direct drive set up (42 inch prop) from my UH13pt,
>>>> and rebuilding it as a belt reduction, with a 54 inch prop, powered
by
>>>> a 23hp Briggs. (Thanks Marquis for your input).
>>>> If 6.25 / 12 pulleys - is that the pulley diameter ratio?
>>>> How many rudders should I use?
>>>> How tall and wide are the rudders?
>>>> Is a trim wing needed?
>>>> Jim
>>>> Rochester, MN
>>> Jim,
>>> You'll be running on the Zumbro with Ben, right?
>>> In that case, I'm going to say 5 rudders. Make them 14" to 18" wide
>>> (all the same) and make sure they deflect about 45 degrees each way.
>>> I suspect you'll want a trim wing or two on that thing. A 13p with a
>>> 54" duct gets a lot of down force on the nose from the high thrust
>>> line. Not sure if a single wing will be noticeable on a craft with
>>> that small an engine, though. Marquis will be able to tell you that
>>> one. I drove his craft, but only once.
>
> Marquis,
>
> The Zumbro river is very small, very twisty and has lots of obstacles
> you can't see until you're right on them. Not only that, he's going
> to be driving with Ben Tilson who runs flat out no matter what.
>
> The river, if I remember correctly, is sometimes around 20 feet wide,
> and often has rocks sticking up above the surface. It's small enough
> that a single tree can and often does fall down and cover the entire
> river's width. Canoes frequently bottom out and they have to get out
> to drag it over rapids.
>
> I still recommend more rudders.
>
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