[Rhodes22-list] Prop Walk Questions From MJM

Tue Jul 27 08:30:39 EDT 2004

Michael,

I apologize if this subject was covered; but, I'm afraid I haven't been
paying very close attention.  Who the heck is Sheldon Green & why are you so
angry with him?

I don't think building a nozzle around your prop will stop the prop walk
phenomena.  About the only way to eliminate prop walk is to use
counterrotating props like on the Volvo-Penta I/O's.

A folding prop will help with the lobster pots while sailing; but, not under
power.

A bow thruster will give you the control you want around the dock to counter
the prop walk.  This option might cost lest than a skeg or nozzle at the
stern of the boat + result in more manuevering capability.

You may have to learn to live with the prop walk.  Skippers of single screw
boats have lived with this phenomena ever since power boats were invented.
Remember, there are some docking situations wherein the prop walk can be
used to advantage to squeeze into & out of a tight space.  Once you get used
to the prop walk & gain confidence in your understanding of the magnitude &
direction of its effects, you may learn to "like it".  Often times, dealing
with prop walk is really a matter of avoiding docking situations where it
makes life difficult.  Learn to plan ahead skipper!

By the way, how does the boat behave while backing up?  Is it hard to
control?  How does it stop under power?

As far as the lobster pots hanging up on the prop, you might be able to do
something with stainless steel tubing.  I would think a welded "guard/skeg"
could be designed that would keep the lobster pots & lines away from the
prop without causing too much drag under sail.

Even if you built a skeg to protect the prop & shaft, I would think the boat
would still have a very hard time being beached on a tidal mud flat.  The
mud will get into your cutlass bearing & prop shaft packing gland, causing
all sorts of premature wear.

Boy inboard diesel engine, wheel steering, standing headroom in the main
cabin...you have really graduated into an entirely different league in
boating haven't you?

I'm glad Karin likes the boat.  You two will surely have a lot of good times
with it.

Roger Pihlaja
S/V Dynamic Equilibrium

----- Original Message -----
From: "Michael Meltzer" <mjm at michaelmeltzer.com>
To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
Sent: Monday, July 26, 2004 9:26 PM
Subject: Re: [Rhodes22-list] well here is my lack of photo skill

> I have to watch out, it to easily to pack rat :-) The boat pretty good
about storage, room under all the seat, the boat pretty
> loaded at this point with the "cluttered" feel(yet).
> Very stiff boat, more beam, 1200 pounds 6 feet down, light weight decks
from vacuumed bagging, and less sail area than the Rhodes.
> added in the 300+ pound for the diesel takes allot to knock her down. Had
her out 10-12 knots gusting to 15, could not get more than
> 15 digress and was doing haul speed on all points. She points high. For
light air I going to have to use the cursing spinnaker.
> Getting their. Karin Likes it. I still need more time to know her(docking
has been a laugh, or is that people laughing at me, And I
> do not let people to close to see the sail shape :-)
>
> I got a question if you are in the mood.
> 1)The prop walk is killing me.
> 2)both the keel and rudder come up, so my prop and prop shaft are even
with if not lower that the rest, boat might reset on it dried
> out
> 3)Lines from lobster pots are all over the place.
> 4)the prop is just "hanging out" like egg beater, not skeg of than 3 foot
shadow from the keel
>
> I been thinking about a ring around the prop, like a "kort nozzle", thin
head on profile and basically round for low water
> resistances.   The idea: it would be able hold the weight of the boat,
overbuild for impact, kill the prop walk and act as a gaur.
> Might even be able to use a vertical shaft slaved to the wheel rotate for
some low speed vector thrust.
>
> Any thoughts?, I have about 2-3 inch of clearance to the underside from
the prop. Do I risks blowing out the bottom of the boat in a
> impact? The area in play is a compound curve, any thoughts front and
backing plates cover area(1 inch vacuumed bag hull). bonding
> problems? to keep the vertical shaft packing above the waterline would an
18 inch tube in tube work? Any ideas how to get it made?,
> Not asking for details, I not "commented" to the idea, but some "back of
the envelope" would be appraised. Thier seem alot of plues
> here, the fact no one is doing it might mean I missing somethimg.
>
> MJM
>
>
>
>
>
>
> ----- Original Message -----
> From: "Roger Pihlaja" <cen09402 at centurytel.net>
> To: "The Rhodes 22 mail list" <rhodes22-list at rhodes22.org>
> Sent: Monday, July 26, 2004 7:48 AM
> Subject: Re: [Rhodes22-list] well here is my lack of photo skill
>
>
> > Michael,
> >
> > Thank-you for posting my Crystal Mountain pictures.
> >
> > Your photos aren't bad.  How did you manage to get photos from about 10
> > months in the future, 5/16/2005? :)  Do you really own this boat or is
this
> > the future?
> >
> > Your boat has very classic lines.  She's a real beauty!  You should have
a
> > lot of fun with this one.
> >
> > Boy, you could seriously lose something in that cavernous quarter
> > berth/storage space under the cockpit, couldn't you?
> >
> > So, how does she sail?
> >
> > Roger Pihlaja
> > S/V Dynamic Equilibrium
> >
> > ----- Original Message -----
> > From: "Michael Meltzer" <mjm at michaelmeltzer.com>
> > To: <rhodes22-list at rhodes22.org>
> > Sent: Monday, July 26, 2004 12:02 AM
> > Subject: [Rhodes22-list] well here is my lack of photo skill
> >
> >
> > >
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> > > __________________________________________________
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> >
> >
> > __________________________________________________
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