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Prop Shaft Length

 

Guys,
?
About two years ago I inqured?about the lenght of the prop shaft as the boat I had just acquired had been cut out and I received several answers with widely varing lengths. Fortunately I wasn't ready to do the replacement then but I am now.
?
I have a replacement shaft which is too long. Scarlet is hull #79 built in 1964 and still has the original Atomic 4. I've got a broom handle in her right now ready to measure for an exact lenght assuming the prop goes in the middle of the opening, which is what I plan to do.
?
I'll?again ask how long?the prop shaft?should be? We can see how close your answers are.
?
Billy Ray Davis Jr.
Scarlet #79?
CHRISTIAN BECKER
 

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I understand your problem.
?
I suggest something to you and others.
?
Get the shaft made or bought. In most cases, they will cut it to a length and mill the key way. I suggest that when you get to a point that? you feel good about the length overall, have then make the shaft somewhat longer to make sure it will fit to your needs, but have the keyway milled (pay for the extra machine time which will be very little) and take the shaft and put it into the boat. See how things look and feel.
?
If the shaft is too long, then all you have to do is to cut it at the keyway since you will have an extra long keyway where the coupling is located or attached. Make sure that you check the diameters of the prop where the taper is. Measure the length of the keyway. When you order the new shaft, ask if the dimensions you are providing are standard or normal.
?
I have seen three different diameter shafts on a Tartan 27.
?
A adapter can be purchased to adapt a small shaft to a larger bore prop. The? plastic molding has a dual taper to compensate. In doing so, the prop will be where is should be on the shaft. There is a place called Freeport Marine in Freeport New York that knows all about these problems. I have used them many times.
?
I would want to make sure of the dimensions of the whole assembly before I would order a shaft. Depending on need, you might need a new prop or this might be the time to change to a two blade plastic. These appear to be great and can be painted with min. primer.
?
I would like to know what is the dimension of your lower black band, measuring to the top of the band, from the bottom of the mast? That is where one starts in establishing the placement of the bands on the mast and on the outboard end of the boom.
?
Good luck.
?
Chris Becker
Tartan 27, Hull 511
Larchmont, NY

----- Original Message -----
From: Bill Davis
Sent: Monday, August 18, 2008 4:15 PM
Subject: [T27Owners] Prop Shaft Length

Guys,
?
About two years ago I inqured?about the lenght of the prop shaft as the boat I had just acquired had been cut out and I received several answers with widely varing lengths. Fortunately I wasn't ready to do the replacement then but I am now.
?
I have a replacement shaft which is too long. Scarlet is hull #79 built in 1964 and still has the original Atomic 4. I've got a broom handle in her right now ready to measure for an exact lenght assuming the prop goes in the middle of the opening, which is what I plan to do.
?
I'll?again ask how long?the prop shaft?should be? We can see how close your answers are.
?
Billy Ray Davis Jr.
Scarlet #79?
 

Billy Ray,
I do not know the exact measurement on the T27 and could not find one in the info posted to the Files section of the Group website.
I think that you are headed in the right direction though, using a broomstick to measure for clearance in the aperture behind your rudder. Much as I would like to guarantee that a measurement offered by one owner will work for your boat I suspect that there are some differences in engine/shaft installations from one boat to the next as some have been 'improved' or modified over time.
I think is important is that you take into account mounting a collar zinc to the outboard engine of the shaft abutting the propeller. The smallest collar or doughnut type zinc I have been able to find is 1" wide. This means that you really need a little more than a full inch of clearance so the zinc will not be rubbing against the hull. I am also pretty certain that our prop shaft is 1" in diameter.
The gap between the prop and the hull on our T27 (#328) is about 1/2" which is a real pain since I have to grind down the 1" zinc collar to fit into that space each time I replace it. For this reason alone I would like to get a slightly longer shaft than I have now if the prop aperture can handle it.
That said, the prop specs for the T27 are given as: 2 Blade: 13x12x1, 3 Blade: 13x11x1
I am assuming that you are using one of these. The only other trick, as I see it, to measuring the shaft length is to accommodate the interaction of the prop and the rudder. You don't want the spinning prop to hit the rudder when the helm is hard over after all; that would be bad for both prop and rudder.
It sounds as though you are making progress with your renovations on "Scarlet" (#79). I love the name. Is the name a nod to Scarlet O'Hara from 'Gone with the wind" or is that your wife's name or does she (the boat) have a red hull or some combination of these? I hope to hear that you get in the water soon.
Caleb Davison
T27 #328 'Odalisque', 1967

-----Original Message-----
From: Bill Davis <backstay13@...>
To: T27Owners@...
Sent: Mon, 18 Aug 2008 4:15 pm
Subject: [T27Owners] Prop Shaft Length

Guys,

About two years ago I inqured about the lenght of the prop shaft as the boat I had just acquired had been cut out and I received several answers with widely varing lengths. Fortunately I wasn't ready to do the replacement then but I am now.

I have a replacement shaft which is too long. Scarlet is hull #79 built in 1964 and still has the original Atomic 4. I've got a broom handle in her right now ready to measure for an exact lenght assuming the prop goes in the middle of the opening, which is what I plan to do.

I'll again ask how long the prop shaft should be? We can see how close your answers are.

Billy Ray Davis Jr.
Scarlet #79
 

Christan and Caleb,
?
Thanks for the advice on the prop shaft. It will be this weekend before I have a chance to mark the broomstick for a measurement. I found an old shaft with a key-way already cut into it so as long as it is straight I should be able to cut it down. I had not thought about room for a zinc as she is going in fresh water (Lake Murray, SC) but I may?take?her to the ocean one of these days. I'll let you know what the length comes out to be, for the record.
?
Scarlet is short for "Scarlet the Harlot" and she will be Red for sure. I'm operating without adult supervision so I can get away with?colorful boat names.
?
Billy Ray Davis
Scarlet #79


--- On Mon, 8/18/08, calebjess@... wrote:
From: calebjess@...
Subject: Re: [T27Owners] Prop Shaft Length
To: T27Owners@...
Date: Monday, August 18, 2008, 7:03 PM

Billy Ray,
I do not know the exact measurement on the T27 and could not find one
in the info posted to the Files section of the Group website.
I think that you are headed in the right direction though, using a
broomstick to measure for clearance in the aperture behind your rudder.
Much as I would like to guarantee that a measurement offered by one
owner will work for your boat I suspect that there are some differences
in engine/shaft installations from one boat to the next as some have
been 'improved' or modified over time.
I think is important is that you take into account mounting a collar
zinc to the outboard engine of the shaft abutting the propeller. The
smallest collar or doughnut type zinc I have been able to find is 1"
wide. This means that you really need a little more than a full inch
of clearance so the zinc will not be rubbing against the hull. I am
also pretty certain that our prop shaft is 1" in diameter.
The gap between the prop and the hull on our T27 (#328) is about 1/2"
which is a real pain since I have to grind down the 1" zinc collar to
fit into that space each time I replace it. For this reason alone I
would like to get a slightly longer shaft than I have now if the prop
aperture can handle it.
That said, the prop specs for the T27 are given as: 2 Blade: 13x12x1,
3 Blade: 13x11x1
I am assuming that you are using one of these. The only other trick,
as I see it, to measuring the shaft length is to accommodate the
interaction of the prop and the rudder. You don't want the spinning
prop to hit the rudder when the helm is hard over after all; that would
be bad for both prop and rudder.
It sounds as though you are making progress with your renovations on
"Scarlet" (#79). I love the name. Is the name a nod to Scarlet O'Hara
from 'Gone with the wind" or is that your wife's name or does she (the
boat) have a red hull or some combination of these? I hope to hear
that you get in the water soon.
Caleb Davison
T27 #328 'Odalisque', 1967

-----Original Message-----
From: Bill Davis <backstay13@yahoo. com>
To: T27Owners@yahoogrou ps.com
Sent: Mon, 18 Aug 2008 4:15 pm
Subject: [T27Owners] Prop Shaft Length

Guys,

About two years ago I inqured about the lenght of the prop shaft as the
boat I had just acquired had been cut out and I received several
answers with widely varing lengths. Fortunately I wasn't ready to do
the replacement then but I am now.

I have a replacement shaft which is too long. Scarlet is hull #79 built
in 1964 and still has the original Atomic 4. I've got a broom handle in
her right now ready to measure for an exact lenght assuming the prop
goes in the middle of the opening, which is what I plan to do.

I'll again ask how long the prop shaft should be? We can see how close
your answers are.

Billy Ray Davis Jr.
Scarlet #79
[email protected]
 

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I have hull #71… so if you need measurements please let me know.? I’m in the water right now, but I did take some photos last time I had her hauled.? It’s highly likely that 73 and 71 are identical boats.? I looked at the posted pics from the boat in Boston and was surprised that there were some differences in the trim work in the v-berth floor area. ??If you would like to see a current picture visit where I have her on the front page now.? I restored the teak toe rail and am working through the rest of the teak.? I also redid the deck at the beginning of this year with kiwigrip.? I have not had time or inspiration to work on the website, but I’m open to practically anything.? If you have a project or some photos you would like to share let me know.? I eventually plan to do a photo gallery and a hull registry.?

?

My boat was repowered to diesel, so my prop is likely different.? There is not space for a zinc of any kind, however, I have not noticed corrosion problems.? I keep my boat in Clear Lake which is brackish, and sail in Galveston bay.? Being as we have a bronze prop and stainless shaft and other “nice hardware” we don’t lose much and we frequently are the “gainer” at the dock.? I was amused last year when they leased the slip next to mine to a boston whaler who left his outboard down.? True to expectations he is not a terribly careful dockmate.? My revenge is quiet knowing he is helping to aluminum plate something on my boat at some small fractional amount.? I have since moved several spaces away.

?

Brian Greul

Texas Shirt Company

713-802-0369 / 713-861-6261 (fax)

Targeted, Effective Promotions to help you grow your brand
[email protected]
 

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One other thing…..

?

In this photo:

?

Make sure you take the hose off and inspect the hull opening.? I found that the cable had “gnawed” mine down pretty good.? I used some goop (my favorite all purpose glue) to secure a bronze pipe ? to 3/8 adapter in there.? The idea is that the bronze is softer then the cable and sacrificial and can be yanked out at some other point with vise grips.

?

You also would be wise to drop that centerboard.? The centerboards are subject to failure at the pivot pin and where the pennant attaches.? My pennant broke and then the pivot gave way after I fixed the pennant.? It was a hackjob replacement that I never have gotten around to remaking…. Maybe this year.? Anyhow, if you have an original board you want to make sure it does not get lost.? If you lose it, it’s not the end of the world and you can still sail, it just takes some of your adjustability away.

?

Brian Greul

Texas Shirt Company

713-802-0369 / 713-861-6261 (fax)

Targeted, Effective Promotions to help you grow your brand
 

Chris- #596 4 sheave head- Base of mast to upper edge
of tape line-94.5".Large 2 sheave mast is 3" longer
and has a different measurement. Hope this may help
Bob-
--- CHRISTIAN BECKER <uni@...> wrote:

I understand your problem.

I suggest something to you and others.

Get the shaft made or bought. In most cases, they
will cut it to a length and mill the key way. I
suggest that when you get to a point that you feel
good about the length overall, have then make the
shaft somewhat longer to make sure it will fit to
your needs, but have the keyway milled (pay for the
extra machine time which will be very little) and
take the shaft and put it into the boat. See how
things look and feel.

If the shaft is too long, then all you have to do is
to cut it at the keyway since you will have an extra
long keyway where the coupling is located or
attached. Make sure that you check the diameters of
the prop where the taper is. Measure the length of
the keyway. When you order the new shaft, ask if the
dimensions you are providing are standard or normal.


I have seen three different diameter shafts on a
Tartan 27.

A adapter can be purchased to adapt a small shaft to
a larger bore prop. The plastic molding has a dual
taper to compensate. In doing so, the prop will be
where is should be on the shaft. There is a place
called Freeport Marine in Freeport New York that
knows all about these problems. I have used them
many times.

I would want to make sure of the dimensions of the
whole assembly before I would order a shaft.
Depending on need, you might need a new prop or this
might be the time to change to a two blade plastic.
These appear to be great and can be painted with
min. primer.

I would like to know what is the dimension of your
lower black band, measuring to the top of the band,
from the bottom of the mast? That is where one
starts in establishing the placement of the bands on
the mast and on the outboard end of the boom.

Good luck.

Chris Becker
Tartan 27, Hull 511
Larchmont, NY
----- Original Message -----
From: Bill Davis
To: T27Owners@...
Sent: Monday, August 18, 2008 4:15 PM
Subject: [T27Owners] Prop Shaft Length


Guys,

About two years ago I inqured about the
lenght of the prop shaft as the boat I had just
acquired had been cut out and I received several
answers with widely varing lengths. Fortunately I
wasn't ready to do the replacement then but I am
now.

I have a replacement shaft which is too
long. Scarlet is hull #79 built in 1964 and still
has the original Atomic 4. I've got a broom handle
in her right now ready to measure for an exact
lenght assuming the prop goes in the middle of the
opening, which is what I plan to do.

I'll again ask how long the prop shaft
should be? We can see how close your answers are.

Billy Ray Davis Jr.
Scarlet #79



 

Chris- Correction-- older 2 sheave head is 3"
shorter.I have one of each. Bob-
--- Robert Wrock <bobwrock@...> wrote:

Chris- #596 4 sheave head- Base of mast to upper
edge
of tape line-94.5".Large 2 sheave mast is 3" longer
and has a different measurement. Hope this may help
Bob-
--- CHRISTIAN BECKER <uni@...> wrote:

I understand your problem.

I suggest something to you and others.

Get the shaft made or bought. In most cases, they
will cut it to a length and mill the key way. I
suggest that when you get to a point that you
feel
good about the length overall, have then make the
shaft somewhat longer to make sure it will fit to
your needs, but have the keyway milled (pay for
the
extra machine time which will be very little) and
take the shaft and put it into the boat. See how
things look and feel.

If the shaft is too long, then all you have to do
is
to cut it at the keyway since you will have an
extra
long keyway where the coupling is located or
attached. Make sure that you check the diameters
of
the prop where the taper is. Measure the length of
the keyway. When you order the new shaft, ask if
the
dimensions you are providing are standard or
normal.


I have seen three different diameter shafts on a
Tartan 27.

A adapter can be purchased to adapt a small shaft
to
a larger bore prop. The plastic molding has a
dual
taper to compensate. In doing so, the prop will be
where is should be on the shaft. There is a place
called Freeport Marine in Freeport New York that
knows all about these problems. I have used them
many times.

I would want to make sure of the dimensions of the
whole assembly before I would order a shaft.
Depending on need, you might need a new prop or
this
might be the time to change to a two blade
plastic.
These appear to be great and can be painted with
min. primer.

I would like to know what is the dimension of your
lower black band, measuring to the top of the
band,
from the bottom of the mast? That is where one
starts in establishing the placement of the bands
on
the mast and on the outboard end of the boom.

Good luck.

Chris Becker
Tartan 27, Hull 511
Larchmont, NY
----- Original Message -----
From: Bill Davis
To: T27Owners@...
Sent: Monday, August 18, 2008 4:15 PM
Subject: [T27Owners] Prop Shaft Length


Guys,

About two years ago I inqured about the
lenght of the prop shaft as the boat I had just
acquired had been cut out and I received several
answers with widely varing lengths. Fortunately I
wasn't ready to do the replacement then but I am
now.

I have a replacement shaft which is too
long. Scarlet is hull #79 built in 1964 and still
has the original Atomic 4. I've got a broom handle
in her right now ready to measure for an exact
lenght assuming the prop goes in the middle of the
opening, which is what I plan to do.

I'll again ask how long the prop shaft
should be? We can see how close your answers are.

Billy Ray Davis Jr.
Scarlet #79



[email protected]
 

开云体育

Speaking of sheaves, I found that I can use a hi-tech line that is the same size as cable for my main halyard.? I had to go up the mast to thread it through, but it works just fine.

?

Brian Greul

Texas Shirt Company

713-802-0369 / 713-861-6261 (fax)

Targeted, Effective Promotions to help you grow your brand
Kyle Erlandsen
 

Been lurking for a while.

?

Watch out when you go from wire rope to hi-tech halyards on old boats.? The sheaves are usually beat up and worn, as well as the surrounding area, as a result of the cutting action of the steel.? The hi-tech stuff is awesome but needs to have smooth surfaces to ride on.

?

Kyle (looking for Hull #2) Erlandsen



----- Original Message ----
From: "brian@..."
To: T27Owners@...
Sent: Thursday, August 21, 2008 9:14:03 AM
Subject: [T27Owners] Re: Prop Shaft Length

Speaking of sheaves, I found that I can use a hi-tech line that is the same size as cable for my main halyard.? I had to go up the mast to thread it through, but it works just fine.

?

Brian Greul

Texas Shirt Company

713-802-0369 / 713-861-6261 (fax)

Targeted, Effective Promotions to help you grow your brand

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