Adding Floatation to a NACRA
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Posted: Aug 10, 2010 - 09:25 PM
Todd & Frank helped me patch that but I still have a real slow leak. The next thing we are going to try and add some filler to the resin and just paint the dagger well with it. But as I said the leak is real slow so I can sail it as is for now. I adjusted my mast rake and moved my weight forward last sail and it sailed like a total diffrent boat I was surprised of how balanced it was when flying a hull. It just felt right! When's the 6.0 coming to 10 mile? -
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Posted: Aug 10, 2010 - 09:33 PM
I wish it were there right now! This weekend is San Antonio for a show...It just seems to go on and on. Glad your able to hit the water. I'm afraid I'm going to have to dial in my boat (and me) all over again. IF I get to head out, I'll definitely give a shout. -
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Posted: Aug 10, 2010 - 09:35 PM
You going to pick up some flotation while your in San Antonio? -
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Posted: Aug 10, 2010 - 09:44 PM
HA! At 7 bucks a tube - Wally world looks like a better alternative. The pool noodles are about 3" dia, so it should have enough room to bend and get them into place. So you adjusted the diamond wires for more agressive rake? Do you know what tension your running? -
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Posted: Aug 10, 2010 - 10:33 PM
How many noodles would give adequate flotation? I would guess more than I would want to put in a hull.
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Nacra 5.2
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Posted: Aug 10, 2010 - 11:01 PM
Well NMMA requires 10% of "capacity" of a hull to be in flotation. I dont think that's the aim on this though. Pfd's would cover occupants and the balance is just to keep the boat in a neutral boyancy state. My boat is 420#, and its actually pretty hard to "burp" all the air in the chambers - So to answer your question - I have no freakin idea :)
There is another product other than the "pool noodle". Polyethelyne foam would be more quantifiable in its flotation factor, as its used currently in the industry for this purpose. -
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Posted: Aug 10, 2010 - 11:31 PM
I have seen people floating around in the pool with 1 noodle so I think 2 in each hull would keep it from sinking. -
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Posted: Aug 11, 2010 - 12:12 AM
just remember "people" are neutrally bouyant as we are mostly water...fiberglass and aluminum - not so much. Just things to ponder. Let me know what you decide on! -
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Posted: Aug 11, 2010 - 02:01 PM
A testament to Nacra buoyancy:
A few weekends ago I took four people out into Lake MI with 15 - 20+ westerly's. I rushed the set up to accomodate the scedule of one of my crew. (He only had an hour) We were out ripping for that hour (two on the trap) and as were were heading back to the beach my wife asked "Why is the boat sinking?" I then felt the plugs in the pocket of my vest! I had everyone go forward and we landed safely. It took 6 guys to ease her far enough up the beach to drain the hulls which were full. -
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Posted: Aug 11, 2010 - 02:14 PM
wow. i got no more than 100' (solo) before i noticed something was very wrong (plugs not in)
but then again, my boat has the most rediculious floatation foam i have ever seen... i doubt a flee could float on it.
See here:
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Posted: Aug 11, 2010 - 02:39 PM
We were in light winds and the hole in my dagger well was bigger then the drain plug hole. The starboard hull was a few inches under water all the way back to shore. -
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Posted: Aug 11, 2010 - 04:13 PM
If you were "ripping", & the plugs were out, you would actually be draining water. When I worked in the Arctic we never bailed out our aluminum boats, just get them going & pull the plug, the water would mostly drain.
Archimedes principal gives us flotation, ie the amount of water displaced equals the amount of flotation.
So,to calculate flotation of noodles, you only need to know the volume they displace.
If you buy the cylindrical ones, the formula is:
V = pi r2 h so lets assume the noodle is 3" x 48"
V = 3.14 x (1.5x1.5) x 48 Note:3" diameter = radius of 1.5"
V= appx 348 cubic inches, that = 1.5 gallons. Water weighs 8.35 lbs per US gallon, so you get appx 12.5 lbs flotation for each noodle, minus the weight of the noodle. My kids noodles have a hole down the center, so you would have to plug each end to get the full value.
Remeber, that the noodles will give you zero flotation, if they are just left floating around, until they are actually submerged, meaning the hull is full, . I would try an inner tube from farm equipment built for spraying crops, the kind that have very skinny, very tall tires. These tubes can be worked through a pretty small hole, then inflated to low pressure. The tube will push up/down & wedge in place. Just google calculating volumes to get an idea of how much they will displace, you will be surprised at how much a lightly inflated 6" tube will float. Tubes are cheap to buy, tough, & a couple of them easily worked through a 4-6" access port in each hull will float the cat.
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Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap
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Posted: Aug 11, 2010 - 04:32 PM
Plastic water bottle...bags of them...http://www.theplastiki.com/
Put a heavy duty plastic liner, like a battery liner and put the bottles in that way.
The H21 has factory installed bags with foam blocks in the forward hulls, they take up a good of the space forward of the cross beam.
They are not secured to the inside of the hulls, they move around, but from the outside you cant notice it. The ones in my boat dont have any evidence of being "funkedified", they seem okay after 22 years. -
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Posted: Aug 11, 2010 - 05:02 PM
You could always stick a few of these in each hull.
http://www.rei.com/product/708992
After buying the expensive flotation bags from APS i found one of thse water bags in my garage and realized that they were very similar for 1/5th the cost of the APS bags.
edited by: TurboCat, Aug 11, 2010 - 10:08 PM -
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Posted: Aug 12, 2010 - 06:01 PM
An inner tube does sound good they floated my ass down the river many times and never poped on the rocks in the river so they are pretty durable. -
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Posted: Aug 24, 2010 - 03:28 PM
Edchris, Thats impressive!
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