Help for restoring a MacGregor 26X, model year 2000

[eco]

Mast Raising System MRS
I am posting my calculations on maximum compressive and buckling strength of a 1.5"x1/8"x6' MRS pole. Please note that these calculations do not include any factor of safety, or any reduction of strength due to holes or load eccentricity etc etc. These are NOT Safe Weight Loads (SWL):

Cross Sectional Properties:
Do = 1.5000 in
t = 0.1250 in
Di = 1.3750 in
A = 0.5400 in^2
I = 0.1287 in^4

length L = 72 in

Material Properties (6061):
E = 10,000,000 psi
σy = 8,000 psi

Strength (6061):
P compr = 4,320 lbs (1,960 kg) based on P = σy * A
P buckl = 2,450 lbs (1,111 kg) based on P = π^2 *E*I / K*L^2 where K=1

p.s. I could not make subscripts and superscripts to work. I will fix it if someone tells me how

[eco]

Hi Eco,

I'll add my $0.02 to your conundrum.
Mast caps may or may not be installed. Some, like mine have their anchor light mounted to the inside of the mast which negates the ability to cap it. I do however have a multi wire anti-bird device similar to this: http://www.defender.com/product.jsp?pat ... id=1816676 installed to keep the little winged critters from nesting.

Great idea. Thank you

As for the stay adjusters, a few folks have gone to marine grade turn buckles which are fine if your storing mast up. If you're trailering like us you may want to stay with the original adjusters.

The backstay should be all one piece and quite slack unless sailing down wind. If this isn't the case with yours I would recommend ordering a stock replacement from BWY.

OK, fair enough. You are the experienced MacGregor sailors. You all must have a reason to say so. I will try to follow your advice. Thank you

If you have the original MRS for the it should consist of a pole about 1 1/4" in diameter and roughly 4' in length. I'm just guessing here but those measurements should be close. Use a halyard to attach to the mast side of the pole and your fiddle blocks between the pole and bow. The original line length is 52' but I found that too short to be able to put any amount of tension on the mast while attaching the furler. I replaced mine with a much longer no-stretch halyard line off ebay. I would recommend around 60' of line.

Thank you. Yes, it is all very very helpful

I am practicing the (manual) mast raising and lowering process. The next step will be to try to rig lines and blocks etc. Recall that they gave me the rigging parts in boxes . I am now realizing that I am short of a few blocks . I will need your help here folks.

[eco]

Blocks and Lines
I am really over my head here. Given that everything was taken apart (from the previous owner) and I have just verified that I am short of a few blocks, please post your photos how to do this step by step . I would prefer the original rigging, or if experience says so, an improved setup. I am forced to buy a few of these parts anyway. I will try to post what I have available at hand.

Here are the blocks available. Items 1-4 are shown in the manual.
What about item 5? It seems to have a specific position.
Items 6-9 are single blocks that can be used anywhere.


Here is a second photo. Please post some photos showing where exactly items a and b are fittted
I have no idea about item c (it looks like an oil filter tool)
And what about items d and e?

[Tomfoolery]

Your ID is too large. Wall thickness is .125", so ID is OD - 2 x ID. That bumps area to .54 in^2, and the moment of inertia to .13 in^4, which results in a Pcr of 2.4 kips with k=1, and compressive stress of .67 ksi.

[eco]

Your ID is too large. Wall thickness is .125", so ID is OD - 2 x ID. That bumps area to .54 in^2, and the moment of inertia to .13 in^4, which results in a Pcr of 2.4 kips with k=1, and compressive stress of .67 ksi.

OK, thank you You are right. I will be correcting at the original post

[Tomfoolery]

Try it again with Young's modulus at 29.9E6 psi, OD=1.51", and ID=1.38". That's what 1-1/4" EMT would give you, resulting in much higher Pcr, even with half the wall thickness (and Fy has no bearing on buckling here), though at a little more weight penalty than the aluminium version.

1-1/4" EMT would cost you $11 for a 10 ft stick (which weighs 10 lb).

[eco]

Try it again with Young's modulus at 29.9E6 psi, OD=1.51", and ID=1.38". That's what 1-1/4" EMT would give you, resulting in much higher Pcr, even with half the wall thickness (and Fy has no bearing on buckling here), though at a little more weight penalty than the aluminium version.

1-1/4" EMT would cost you $11 for a 10 ft stick (which weighs 10 lb).

Strength for a Steel pole (ASTM-A36):
P compr = 10,699 lbs (4,854 kg)
P buckl = 4,349 lbs (1,973 kg)
Yes you are correct about strength to price ratio. I am concerned about resistance to (occasional) corrosion.

[Tomfoolery]

The upshot being that there are several options, including steel tube, or even wood, which is rust resistant, too.

[eco]

The upshot being that there are several options, including steel tube, or even wood, which is rust resistant, too.

Of course. Thank you Please check my earlier posting about blocks and lines. I have just included a photo. A second is coming up.

[Tomfoolery]

Blocks and Lines
I am really over my head here. Given that everything was taken apart (from the previous owner) and I have just verified that I am short of a few blocks, please post your photos how to do this step by step . I would prefer the original rigging, or if experience says so, an improved setup. I am forced to buy a few of these parts anyway. I will try to post what I have available at hand.

Here are the blocks available. Items 1-4 are shown in the manual. What about items 5-9?


Here is a second photo. Please post some photos showing where exactly items a and b are fittted
I have no idea about item c (it looks like an oil filter tool)
And what about items d and e?

Can't see the pics. Try hosting them on tinypic.com or some other hosting site.

[eco]

Can't see the pics. Try hosting them on tinypic.com or some other hosting site.

Fixed it (and my other postings) the same way the moderator fixed it earlier for me, that is by changing the link parameters. I will check the tinypic.com too.

[eco]

Rigging
Dear friends, here are some photos (on furling) from a found in a local bay. This is what I need to restore my to its original version (or better). I doubt if these below show the original setup, do they?

more soon

[eco]

Rigging 2
Here is the boom/mainsheet details . They seem OK, but are they as the original?

[eco]

Rigging 3
Here are some photos from the boom vang (again from a found in the local bay). Please post your setup as better examples.

So based on what I have at hand, it will be a necessity to buy most of these items. Your feedback will be most appreciated.

[eco]

I get no replies. I guess you are all back sailing again