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Showing results 1 to 25 of 500
Search took 0.23 seconds.
Search: Posts Made By: Stumble
Forum: General Discussion (sailing related) 2 Days Ago
Replies: 20
Views: 1,261
Posted By Stumble
Re: 3D Printing

David,

One off parts are actually a good place to start. Take a 3d laser scan in about five minutes, then immediatly start printing the part.
Forum: General Discussion (sailing related) 2 Days Ago
Replies: 20
Views: 1,261
Posted By Stumble
Re: 3D Printing

West,

If I was taking a cast part to sls it should actually be stronger. If it was machined, or wrought the printed part is likely a little weaker. On the other hand there are a lot of good...
Forum: General Discussion (sailing related) 3 Days Ago
Replies: 20
Views: 1,261
Posted By Stumble
Re: 3D Printing

That's it in a nut shell. Basically you take a cast or sintered part and place it under really high heat and preassure to drive out any voids. And for powdered sintered parts it also help fuse any...
Forum: General Discussion (sailing related) 4 Days Ago
Replies: 20
Views: 1,261
Posted By Stumble
Re: 3D Printing

The company I used to work for made 3d printed titanium parts. Post fabrication HIPPING lead to measured strength at least equal to machined parts. Depending on the design pre hipped parts were in...
Forum: General Discussion (sailing related) 4 Days Ago
Replies: 20
Views: 1,261
Posted By Stumble
Re: 3D Printing

I think the real breakthrough will come when the machines can print stainless fasteners with enough resolution to replace inventory. Right now they take some post fabrication. As soon as this happens...
Forum: General Discussion (sailing related) 5 Days Ago
Replies: 20
Views: 1,261
Posted By Stumble
Re: 3D Printing

Sls machines have the ability to print at around 99.9% the density of a milled metal product. While I doubt it will happen any time soon it is technologically possible for a marina to instal a...
Forum: Good Old Boat 1 Week Ago
Replies: 56
Views: 35,539
Posted By Stumble
Re: LEDs afloat

Anything posted that indicated using led's for nav lights is illegal is just wrong. Any light source is acceptable by the Uscg so long as the lamp meets their viewable range requirements. It is just...
Forum: General Discussion (sailing related) 1 Week Ago
Replies: 15
Views: 705
Posted By Stumble
Re: Designer Sails?

Cory,

Cruisers are a little more conservative as a group, but almost all racers I know would be thrilled to add a sponsors logo to their sails. Spinnakers are generally prefered since it shows up...
Forum: General Discussion (sailing related) 1 Week Ago
Replies: 15
Views: 705
Posted By Stumble
Re: Designer Sails?

I think there is a big difference between being interested in having graphics on my sails and having that daisy print on them.
Forum: General Discussion (sailing related) 1 Week Ago
Replies: 15
Views: 705
Posted By Stumble
Re: Designer Sails?

Wow.... Just wow.
Forum: Electronics 1 Week Ago
Replies: 16
Views: 561
Posted By Stumble
Re: iPad 4 as a GPS ?

Get a cheap 2.4amp car charger... Amazon.com: Anker® 24W Dual-Port Rapid USB Car Charger with PowerIQ technology and 3ft / 0.9m Micro USB Cable for Galaxy S5 S4, Tab 2, Note 4 3 , LG G3, Nexus 6 9,...
Forum: Gear & Maintenance 1 Week Ago
Replies: 28
Views: 1,845
Posted By Stumble
Re: Light air/Downwind sail choices

For a cruising boat Code 0's are generally a terrible idea. There are some out there that can use them to effect, but a code zero is an upwind beating spinnaker that induces a lot of loads on the...
Forum: Beneteau 3 Weeks Ago
Replies: 81
Views: 5,259
Posted By Stumble
Re: Beneteau Halts Production?

Wow. That is a pretty half a$$ job. I would probably refuse delivery until those things were corrected and the boat meets the ordered specs.
Forum: Gear & Maintenance 3 Weeks Ago
Replies: 20
Views: 1,650
Posted By Stumble
Re: What would cause this?

What I see is a lot of old damage that is coming home to roost. The key, or what's left of it, looks like it has been cracked long enough for the bright metal to tarnish. This indicates that is has...
Forum: Gear & Maintenance 3 Weeks Ago
Replies: 8
Views: 513
Posted By Stumble
Re: Pontos Winches

Overdrive winches are just so much fun. Sadly winches just never seem to wear out so its hard to justify upgrading. But if you are willing to splurge self tailing winches in good shape generally sell...
Forum: General Discussion (sailing related) 3 Weeks Ago
Replies: 45
Views: 1,765
Posted By Stumble
Re: Blocks, Sheaves and Pulleys: Did I screw up???

At least on the 40mm blocks there are published numbers on friction based on a 200lb load (practical sailor). The group average ran around 10%, with a few being more or less. I don't remember the...
Forum: Gear & Maintenance 3 Weeks Ago
Replies: 23
Views: 1,115
Posted By Stumble
Re: Roller Furling Answers and Opinions Desired

One very nice trick is to use a ratchet block as the last block bringing the furling line back. This induces enough load on the line to keep it from getting tangled on the drum, and it's pretty much...
Forum: General Discussion (sailing related) 3 Weeks Ago
Replies: 26
Views: 1,306
Posted By Stumble
Re: America's cup, BERMUDA??????????????

Oma,

There are already technologies trickling down. Halyard locks are coming down in price, multi-speed winches are almost at consumer level prices, block designs are getting better. The use of...
Forum: Gear & Maintenance 3 Weeks Ago
Replies: 8
Views: 513
Posted By Stumble
Re: Pontos Winches

I haven't used them, but I have used multi-speed winches. Other than price they are down right rediculiously nice to have. The overdrive means you shouldn't hand over hand the line in, so there is no...
Forum: General Discussion (sailing related) 3 Weeks Ago
Replies: 45
Views: 1,765
Posted By Stumble
Re: Blocks, Sheaves and Pulleys: Did I screw up???

A coupke of things....

Increasing block size from 40mm to 52mm reduces friction by half. For a number of reasons, but bend radius, and bearing shaft size play the largest part. A 40mm block will...
Forum: Gear & Maintenance 3 Weeks Ago
Replies: 48
Views: 2,209
Posted By Stumble
Re: Black Water Thru-Hull Location

The shear strength of 5200 is effected somewhat by substrate, but in the case it really doesn't matter much.

5200 sheer by substrate
Fiberglass - 362psi (G-10)
Gell coat - 519psi
Bronze -...
Forum: General Discussion (sailing related) 3 Weeks Ago
Replies: 45
Views: 1,765
Posted By Stumble
Re: Blocks, Sheaves and Pulleys: Did I screw up???

What blocks are you using?

In my experience the normal thing to expect is for people to grossly oversize lines which means the friction builds up quickly. And don't trust manufacturers...
Forum: Gear & Maintenance 3 Weeks Ago
Replies: 48
Views: 2,209
Posted By Stumble
Re: Black Water Thru-Hull Location

It may be too late, but there is a reason backing plates are round not triangular. It helps distribute the load more evenly, and prevents point loading. What you have really isn't any different then...
Forum: Gear & Maintenance 3 Weeks Ago
Replies: 24
Views: 1,274
Posted By Stumble
Re: How will nanotechnology improve sailboats and sailing?

Forte has already begun producing carbon nano-tube/carbon-fiber/epoxy masts. They claim an increased compressive strength of about 15% for the same weight. Or a reduction in weight by about the same....
Forum: Gear & Maintenance 3 Weeks Ago
Replies: 17
Views: 1,150
Posted By Stumble
Re: Cracked Mast

Even assuming you get a good welder, which is not the same thing as some guy with a stick. Masts are tempered, and local welding destroys the temper. There may be ways to avoid or correct for this,...
Showing results 1 to 25 of 500

 

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