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Forum: Challenges

20-12-2012, 12:36

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: Steel or Aluminum

When the steel cat runs onto rocks it's weight and momentum will generate a lot of force.

Forum: Challenges

18-12-2012, 16:21

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: Steel or Aluminum

That table says 100hp is equivalent to 42.5kW, which is about 57 hp, so not triple the power. Add in a bit of salesemanship, and you'll likely find one diesel horsepower is pretty much the same as an...

Forum: Challenges

18-12-2012, 11:57

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: Steel or Aluminum

LOL! Common knowledge?

OK so here's a plan. Get a 1 KVA Honda genset. Run a 1kW electric motor off it. Because that 1 KVA electric motor is 3 times as powerful, run a 3 KVA generator off that....

Forum: Challenges

17-12-2012, 18:14

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: Steel or Aluminum

Sorry, but I can't see how this is right.

80hp is about 60 kW. You could run a 60 kW generator with a 74 kW diesel. 74kW = 100hp.

So a 100 horsepower diesel, if you connect it to a generator...

Forum: Challenges

08-12-2012, 18:28

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: Steel or Aluminum

I disagree. Building from prefab flat cored fibreglass panels has many of the advantages of steel, plus a few more.

It's far easier and faster to cut.
Taping joins is faster than welding IMO....

Forum: Challenges

08-12-2012, 14:21

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: Steel or Aluminum

My 44' cat took around 6000 hours. I know a few others who have taken similar timeframes. No doubt a 65 foot cat in steel or aluminium would take MUCH longer, maybe double that or more.

Seems my...

Forum: Challenges

08-12-2012, 11:48

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: Steel or Aluminum

It's epoxy, so no osmosis. Polyurethane paint, so gel coat either. No female moulds, it's built from prefabricated panels.

I used fibreglass because I wanted a good performing sailboat. Metal...

Forum: Challenges

07-12-2012, 13:36

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: Steel or Aluminum

$700,000 for materials only? Seems very high to me.

$200,000 and 3 years is optimistic though. Took me $200k and 4 years for a 44 foot sailing cat.

Forum: Challenges

07-12-2012, 12:32

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: Steel or Aluminum

The boat would be lighter in Aluminium, there's no getting around that. So it could use smaller motors, carry less fuel and ultimately be cheaper to operate. Steel will be cheaper to build.

How...

Forum: Challenges

07-12-2012, 11:31

Replies: 125

Steel or Aluminum

Views: 16,705

Posted By 44'cruisingcat

Re: steal or aluminum

It's not a myth. Aluminium IS lighter. Seen any steel aircraft lately?

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