Empathy List Archives

J

JWilkins@idahopower.com

Fri, Aug 31, 2001 6:21 PM

Quick question...Don't have my books handy and can't remember off the top of
my head.
Part one....A right hand prop, when viewed from astern spins a) clockwise or
b) counterclockwise when operating in the fwd direction?
Part two.....a RH prop, when backing with rudder amidships imparts movement
to a) port or b) starboard?
Part three...is RH or LH rotation more common for trawler sized (40') single
screw boats?
.
Is there a good mnemonic to remember this?
.
Joel Wilkins

Quick question...Don't have my books handy and can't remember off the top of my head. Part one....A right hand prop, when viewed from astern spins a) clockwise or b) counterclockwise when operating in the fwd direction? Part two.....a RH prop, when backing with rudder amidships imparts movement to a) port or b) starboard? Part three...is RH or LH rotation more common for trawler sized (40') single screw boats? . Is there a good mnemonic to remember this? . Joel Wilkins

J

jgaquin@ici.net

Fri, Aug 31, 2001 8:22 PM

Part one....clockwise
Part two.....port
Part three...don't know (guess: RH)

JG

> Part one....clockwise > Part two.....port > Part three...don't know (guess: RH) JG

C

cculotta@iamerica.net

Sat, Sep 1, 2001 12:11 AM

Joel,
In a word YES.
To tell if a prop is right or left rotation:
Standing behind the prop, if you are able to scuff your Right foot up the blade
it is Right hand rotation. Guess what , if you can scuff your left foot up the
blade it is----you guessed it-- Left hand rotation.
Of course if the prop is on the boat and you stand behind it just imagine your
foot going up the blade!!!
Comes in real handy if your props are not marked and you took them off and cant
remember which goes where.
CCC

"Wilkins, Joel" wrote:

Quick question...Don't have my books handy and can't remember off the top of
my head.
Part one....A right hand prop, when viewed from astern spins a) clockwise or
b) counterclockwise when operating in the fwd direction?
Part two.....a RH prop, when backing with rudder amidships imparts movement
to a) port or b) starboard?
Is there a good mnemonic to remember this?
.
Joel Wilkins

--
Charles and Pat Culotta
Patterson, La.
Web Site: http://www.geocities.com/charlesculotta/

Joel, In a word YES. To tell if a prop is right or left rotation: Standing behind the prop, if you are able to scuff your Right foot up the blade it is Right hand rotation. Guess what , if you can scuff your left foot up the blade it is----you guessed it-- Left hand rotation. Of course if the prop is on the boat and you stand behind it just imagine your foot going up the blade!!! Comes in real handy if your props are not marked and you took them off and cant remember which goes where. CCC "Wilkins, Joel" wrote: > Quick question...Don't have my books handy and can't remember off the top of > my head. > Part one....A right hand prop, when viewed from astern spins a) clockwise or > b) counterclockwise when operating in the fwd direction? > Part two.....a RH prop, when backing with rudder amidships imparts movement > to a) port or b) starboard? > Is there a good mnemonic to remember this? > . > Joel Wilkins -- Charles and Pat Culotta Patterson, La. Web Site: http://www.geocities.com/charlesculotta/

2

2448210@msn.com

Sat, Sep 1, 2001 12:36 AM

Another way is to place your hand over the hub...if your right hand
fits...it's RH.

Remember, a props job is to "screw" itself into the water...so to
speak...picture that!

RJ
----- Original Message -----
From: "Charles Culotta" cculotta@iamerica.net
Cc: "TWL (E-mail)" trawler-world-list@samurai.com
Sent: Friday, August 31, 2001 8:11 PM
Subject: TWL: How to tell if RT. or Lft. Prop rotation

Joel,
In a word YES.
To tell if a prop is right or left rotation:
Standing behind the prop, if you are able to scuff your Right foot up the

blade

it is Right hand rotation. Guess what , if you can scuff your left foot up

the

blade it is----you guessed it-- Left hand rotation.
Of course if the prop is on the boat and you stand behind it just imagine

your

foot going up the blade!!!
Comes in real handy if your props are not marked and you took them off and

cant

remember which goes where.
CCC

"Wilkins, Joel" wrote:

Quick question...Don't have my books handy and can't remember off the

top of

my head.
Part one....A right hand prop, when viewed from astern spins a)

clockwise or

b) counterclockwise when operating in the fwd direction?
Part two.....a RH prop, when backing with rudder amidships imparts

movement

to a) port or b) starboard?
Is there a good mnemonic to remember this?
.
Joel Wilkins

--
Charles and Pat Culotta
Patterson, La.
Web Site: http://www.geocities.com/charlesculotta/

Another way is to place your hand over the hub...if your right hand fits...it's RH. Remember, a props job is to "screw" itself into the water...so to speak...picture that! RJ ----- Original Message ----- From: "Charles Culotta" <cculotta@iamerica.net> Cc: "TWL (E-mail)" <trawler-world-list@samurai.com> Sent: Friday, August 31, 2001 8:11 PM Subject: TWL: How to tell if RT. or Lft. Prop rotation > Joel, > In a word YES. > To tell if a prop is right or left rotation: > Standing behind the prop, if you are able to scuff your Right foot up the blade > it is Right hand rotation. Guess what , if you can scuff your left foot up the > blade it is----you guessed it-- Left hand rotation. > Of course if the prop is on the boat and you stand behind it just imagine your > foot going up the blade!!! > Comes in real handy if your props are not marked and you took them off and cant > remember which goes where. > CCC > > "Wilkins, Joel" wrote: > > > Quick question...Don't have my books handy and can't remember off the top of > > my head. > > Part one....A right hand prop, when viewed from astern spins a) clockwise or > > b) counterclockwise when operating in the fwd direction? > > Part two.....a RH prop, when backing with rudder amidships imparts movement > > to a) port or b) starboard? > > Is there a good mnemonic to remember this? > > . > > Joel Wilkins > > -- > Charles and Pat Culotta > Patterson, La. > Web Site: http://www.geocities.com/charlesculotta/ > > >

JA

jim.ague@worldnet.att.net

Tue, Sep 4, 2001 12:55 AM

.
Is there a good mnemonic to remember this (LH vs RH)?
.
Joel Wilkins

Well, ...

I entered this mnemonic into the list about a year ago and confused
everyone, but I'll try again. It works for me and it is based on what we
used to do in EE class to understand magnetic fields around a current
flowing through a wire.

To understand a RH prop:

take your right hand, place it palm up in front of you with its thumb
extended so it points away from your belly,

curl your RH fingers so they cover your palm retaining palm up, thumb
forward (seriously),

Now then the thumb represents the forward motion of the boat, the curl of
the fingers running from their connection to the palm to their fingertips
indicate rotation of the prop, which is you do this right will be clockwise,
and the part of the fingers you see (fingertips) are pointing in the
direction that the boat will walk when it is going in the direction of your
thumb, starboard.

Hold this and rotate your wrist so your thump points at your belly to
represent going astern. The fingers are now CCW and the viewable portion is
telling you the boat walks to port.

Please do not send me private email asking to explain any further. This is
the best I can do.

-- Jim

Jim & Rita Ague
M/V Derreen, Monk 36

>>. >>Is there a good mnemonic to remember this (LH vs RH)? >>. >>Joel Wilkins Well, ... I entered this mnemonic into the list about a year ago and confused everyone, but I'll try again. It works for me and it is based on what we used to do in EE class to understand magnetic fields around a current flowing through a wire. To understand a RH prop: take your right hand, place it palm up in front of you with its thumb extended so it points away from your belly, curl your RH fingers so they cover your palm retaining palm up, thumb forward (seriously), Now then the thumb represents the forward motion of the boat, the curl of the fingers running from their connection to the palm to their fingertips indicate rotation of the prop, which is you do this right will be clockwise, and the part of the fingers you see (fingertips) are pointing in the direction that the boat will walk when it is going in the direction of your thumb, starboard. Hold this and rotate your wrist so your thump points at your belly to represent going astern. The fingers are now CCW and the viewable portion is telling you the boat walks to port. Please do not send me private email asking to explain any further. This is the best I can do. -- Jim ~~~~~~~~~~~~~~~~~~~~ Jim & Rita Ague M/V Derreen, Monk 36 ~~~~~~~~~~~~~~~~~~~~

S

scaramouche@tvo.org

Tue, Sep 4, 2001 3:09 PM

JWilkins@idahopower.com writes:

Is there a good mnemonic to remember this?

Righ-hand prop in reverse becomes left-hand (CCW) and boat moves to
the left (Port). That's how I remember it (Left - left).

George of Scaramouche1, Lake Ontario

JWilkins@idahopower.com writes: >Is there a good mnemonic to remember this? Righ-hand prop in reverse becomes left-hand (CCW) and boat moves to the left (Port). That's how I remember it (Left - left). George of Scaramouche1, Lake Ontario

R

rhj@pacific.net.hk

Wed, Sep 5, 2001 11:43 AM

Right-hand prop in reverse becomes left-hand (CCW) and boat moves to

the left (Port). That's how I remember it (Left - left). <<

Easiest way I was shown use brackets with the gear / throttles the point in
the right directions
FWD
( * )
Rev

Rob Harrington-Johnson
42 Cheoy Lee
Fat Cheoy
Hong Kong

>>Right-hand prop in reverse becomes left-hand (CCW) and boat moves to the left (Port). That's how I remember it (Left - left). << Easiest way I was shown use brackets with the gear / throttles the point in the right directions FWD ( * ) Rev Rob Harrington-Johnson 42 Cheoy Lee Fat Cheoy Hong Kong

trawlers@lists.trawlering.com

TWL: Prop rotation