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Old 12th October 2006, 06:09 AM   #11
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Here's the heatsink
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Old 12th October 2006, 06:19 AM   #12
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Originally posted by Zen Mod
new engine+Z-foot
[Way off-topic On]


i suppose you mean the boat has an engine and a Z-drive and you need to know what kind of screw is needed ?

If so:

The screw type depends on the outgoing RPM, speed of the boat (engine power), torque, and allowable screw diameter. A cavitating screw is required for a planing or semi-planing hull.

Don't think you'll find much information on the web, the boatbuilding business is very conservative, and many parameters are emperical.

[Way off-topic Off]
It doesn't count how one deals with winning, but how to handle a loss (© DjT)
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Old 12th October 2006, 01:41 PM   #13
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Location: Herndon Virginia
Default copper heat sinks

The guys talking about the copper heat sinks have a valid point.

Some years back I worked on a Ling 8016 power amp used in the vibration business. It had 860 output transistors on 16 output cards. Each TO3 package was mounted to a copper bar, and on the back of the bar was a small water pipe.

The whole amp was cooled by street water.

When cranked up to full power (about 80kw) we never had a heat related failure of the parts.

A few times when other heavy water using devices were running we did trip a safety when enough GPH coulden't get through the amp.

There are a lot of surplus heat sinks on the market. Taking an existing one and choping it to fit is always an option. Or go the micro processor route and have individual fans blowing across each heat sink.

Good luck on your project
Mike aka Jack Crow in Kuwait
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Old 12th October 2006, 01:59 PM   #14
dnsey is offline dnsey  United Kingdom
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Depending on what you're building, would it not be simpler to have one sink per device?
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Old 12th October 2006, 04:08 PM   #15
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Jack Crow Surplus heat sinks is an option. But the question is: where do I find them at a reasonable price?

I will use a fan if the heatsinks isn’t enough.

Dnsey Using one heatsink is easier of course. But as I already have 8 heatsinks I ‘ll try to use one more heatsink first.
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Old 13th October 2006, 03:10 AM   #16
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Good question.
Now you show up my ignorance of the rest of the world.

In the US there are companies that buy up scrap and surplus military and industrial electronics.

Some items end up on web sites of used gear.

The one that I use is called MPJA and they are in Florida USA.
They have all kinds of stuff. Good people.

When I was last down there, I ran into a few wharehouse operations that did the same thing.

Care to guess who diden't think to get a business card.

At times like this, Google can be your friend.

Do you know anybody with a good machine shop with a three axis mill? Sometimes known as a Bridgeport. A guy good with that tool can make some amazing parts, and convert surplus parts to a new requirment.

Where I used to work we had one there. Our operator modified an old heat sink to fit a 10 watt class A Brick RF amplifier. Made a 'flat' area for the brick, drilled, tapped and countersunk the mounting holes. A thing of beauty.

I gather your building a 'one of a kind' unit this is not too bad a way to go.

As for locating chunks of metal, there are scrap dealers that trade. Again back home if I needed a block of aluminum or steel, it's a look in the phone book for the nearest one.

Are you near any kind of industry? Perhaps someone who has a small machine shop can be of help.

Expensive but worth it.

Much luck

Jack Crow aka Mike in Kuwait
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Old 13th October 2006, 05:46 AM   #17
jleaman is offline jleaman  Belgium
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Originally posted by globalweb
Here's the heatsink

best ebay person i have ever bought stuff from. Sends product fast and i use 4 of these on my mini aleph's.

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Old 13th October 2006, 05:58 AM   #18
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Thanks, I always knew you Canadian dudes were cool.
Met a few over here. Sharp guys.

Be safe
Mike aka Jack Crow in Kuwait.
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