SailNet Community banner
  • SailNet is a forum community dedicated to Sailing enthusiasts. Come join the discussion about sailing, modifications, classifieds, troubleshooting, repairs, reviews, maintenance, and more!

How much weight (bosun's chair) can a Catalina 22 mast support?

9.3K views 26 replies 19 participants last post by  AWT2_Sail  
#1 ·
I have a 1985 Catalina 22. The halyards are half steel cable and half 3/8" line. Regardless of the composition of the halyards themselves, should a Catalina 22 mast be able to support the weight of a 190 lb person being hoisted in a bosun's chair?
 
#7 ·
It's not so much whether the mast can take the load...of course it can! The loads would be far greater sailing in a stiff wind.

The question you should be asking is, what will the boat do with 200lbs at the top of the mast....its gonna heel pretty good I would think. I don't know what the righting moment of a Cat 22 is, but I don't think I would want to be up the mast with anybody walking around on the boat.

I would just drop the mast to do whatever repairs are needed on a boat that size.

Sent from my SM-G960W using Tapatalk
 
#9 ·
Learned about this on a Blue Jay when I was about 10. I had my 80-pound friend climb up the mast to measure the distance from the top to the hounds (where the shrouds attach) while I steadied the boat with my weight as ballast in the cockpit. He got up there OK, but then dropped the ruler into the water. I went to pick it up before it floated away and he went swimming from the masthead.
 
#10 ·
It can absolutely support the weight. We've done some crew recovery exercises on my Catalina 22 and the mast and rigging have supported my weight in two different configurations.

My wife was able, solo, to hoist me over the transom with the main tackle clipped to my harness. So that's the mast, boom, gooseneck, etc, all dealing with my 180 pounds.

We were also able to use the main halyard to winch me up amidships, but this took a strong man on the winch and a second tailing (small, single-speed winches).

So the rigging can definitely take the weight.

But.... I would never send that much weight to the top of the mast. 550 pounds of ballast 5' below the boat, vs 180 pounds of human 25' above the mast? That math doesn't work out for me.



At launch this year I:
a) knocked a reflector off one side of my windex
b) neglected to run a messenger line for my missing spinnaker halyard
c) dropped my topping lift down inside the mast

So I have three reasons to do some work at the top of the mast, and I'll be dropping the mast to do it. No way would I send someone up.
 
#20 ·
Go to YouTube

Search on "stepping mast catalina 22", "lowering mast on catalina 22", etc.

You'll find a bunch of videos showing how to do it. It's really not bad.

Don't even think about going up the mast.

BTW, great little boat. Best of luck with her.

Jim
 
  • Like
Reactions: JoCoSailor
#22 ·
Sorry for "necro-ing" this thread, but in case anyone wants the math on this topic, about 38 lbs at the top of the mast counteracts the keel's ability to keep the mast vertical of its own accord. Anything over that, and you are relying on the boat's ability alone. With a 30' mast height above the waterline, it's pretty easy to exceed that ability. So at 190 lbs, if you don't keep that mast perfectly pointed to the sky at all times, you're going to go for a swim.

Notes: This assumes a keel weight of 450 lbs, draft of 5' (keel center of gravity roughly 2.5' below the waterline), and mast height 30' above the waterline. For moment calculations, it is assumed that all rotation is about a longitudinal axis directly below the mast at the waterline. There are far more complex calculations to be made for more accuracy but for me, it's enough to show that climbing the mast on a Catalina 22 is something that I will NEVER do, especially because lowering the mast and then re-stepping it is extremely easy... easier than hoisting myself up the mast.
 
#25 ·
Well, as the boat heels over to 90 degrees... as long as the center of gravity never reaches a point directly over the toe rail, it will always right itself so let's use the toe rail as a pivot point and lay this theoretical boat on it's side. On one side of this pivot point we would have the mast and the upper deck and on the other side we would have the rest of the boat.

Let's assume that about 250 lbs is on the mast side and the other 2,000 is on the keel side (very conservative as I'm sure the upper deck and mast weigh a lot more than 200 lbs). Let's also assume that the "arm" of the keel side is half-way from the pivot point out to the end of the keel (this is also conservative as I'm sure it is a lot closer to the pivot point). With an approximate freeboard of 2', this means that a draft of 5' plus 2' freeboard gives us 7' from pivot point to keel tip. Half-way would be 3.5'. With a 3.5' arm and a weight of 2,000 lbs, we have a moment of 7,000.

For the mast side, we will assume the center of gravity for this portion is half-way also. The mast height is 25' plus about 2' for the toe rail to the step height... total 27'. With this portion weighing 200 lbs, the moment would be 5,400. So far, so good.

Now, to perfectly balance the boat on this pivot point (toe rail) we subtract the 5,400 from the 7,000 to get a moment of 1,600. Finally, we divide this moment by the arm (length from the pivot point) to get the weight that would balance the boat at that point. In this case, we are talking the top of the mast. So...

1,600 / 27' = 59 lbs

Any more than 59 lbs of force at the top of the mast, and the boat is tipping over.

Also note that when a sailboat is sailing, it isn't just the weight of the keel that keeps it upright. There are aerodynamic forces coming into play with both the sails, keel and hull. For wind pressure on sails:

Wind Pressure per Square Foot = (0.00256) x (Wind Speed in mph)^2

So with the Catalina 22, the total sail area is about 205sqft. This calculates to 328 lbs of total force for both sails in 25mph winds (kinda getting up there for this boat). With the sail plan, the center of pressure is about 1/3 of the way up from the bottom of the sail and with a 25' tall mast, this places it at about 8.33'. The center of pressure is the average point at which the total force of the wind on the sails acts. Add 4' to that to get the height above the waterline. This is 12.33'. With a force of 328 lbs of total force at a point 12.33' up from the waterline, the moment would be about 4,050... not enough to tip the boat all the way over. Remember that it needs to exceed a moment of 7,000 to completely tip it past the toe rail and as it tips, the vertical component of the sail area exposed to the oncoming wind is lessened.

Anyway, like I said, it is actually much more complicated than that but suffice it to say, this boat is just too light for it to make any sense climbing the mast when it's in the water. But it was fun doing the calculations. ;)