? about a Bracket

[Roland Rodriguez]

Stainless Marine makes an outstanding bracket, cost is about 1500. for a single. There are some companies here in South florida that are making a good quality powder coated bracket for about 900. By the by....the folks at Stainless stated that a single cavity platform bracket will create about 400 lbs of lift when proper installed. 400 lbs of lift will help offset the weight of that outboard.

[Briguy]

When speaking about lift from a flotation bracket, how much poundage of lift do you get for each square foot of internal air? A single giving 400 lbs of lift seems optamistic. My guess is that it only occupies maybe 6 square feet inside. That would mean one sq ft of submurged bracket =65+ lbs of flotation. Does anyone know for sure????????? [img]images/icons/confused.gif[/img] [img]images/icons/confused.gif[/img]

[John R]

I'm no enjineer but I'm guessing that how many cubic feet of water inside the bracket but below the waterline would give you how much boyancy of the bracket's chamber....

Ok - this got me thinking and I looked it up:

Weight water:62.416 pounds per cubic foot at 32°F
Weight water:61.998 pounds per cubic foot at 100°F
Weight water:8.33 pounds/gallon, 0.036 pounds/cubic inch
Weight air: about 1 ounce per cubic foot at room temp

So to add 400 pounds of floatation, only 6.5 cubic feet need to reside below the waterline of the bracket plus some additional cubic feet of air to make up for the added weight of the bracket itself(the air above the waterline does not contribute to boyancy but heavier materials above would detract from the boyancy)

[ December 16, 2002, 09:28 AM: Message edited by: John R ]

[EBEACH]

According to Hermco, The “Seamark” single engine bracket gives over 420 lbs. of buoyancy when submerged to the bottom of its swim platform. The twin is over 890 lbs.

FYI, I noticed in the picture of the advertisement that the rigging is on the left side, but before it was on the right.

[ltdan]

this boat has been sold [img]images/icons/smile.gif[/img] lt dan