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Old Jul 16, 2012, 12:22 AM
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United States, GA, Buford
Joined Nov 2007
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Question
Who wants stuff?

Meet the M140 and C140 concept models. The C140 is still in development. These are pictures or information that I really do not want to release, but I want to expand our boating hobby. If I can get enough interest, then I might have enough of a footing to try and get what we need/want. Yes, I focus on racing and not scale, but the same rules apply, therefore everyone will get piece of the action.

We need basic kits at least. Hulls and props ARE the most desired things I've seen in this forum. Who wants to see something happen?

What do you want to see?

M140 Specs:
- 140mm length, 156mm with rudder
- 40mm beam
- Fully Adjustable Stinger Drive
- trim tab capable
- adjustable trim tab angles
- easily interchangeable parts
- Fiberglass Hull
- specialized hardware

C140 Specs:
- 140mm length, ?mm with rudder
- 52mm beam
- possible twin setup
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Old Jul 16, 2012, 12:23 AM
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Old Jul 16, 2012, 07:38 AM
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I like the M140 but either one would be great
Dave
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Old Jul 16, 2012, 02:04 PM
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Hi bim,

I'm much more interested in sail but I haven't been able to force myself to get a toe hold on any 3D software.

I'm thinking around 7.5" to 10" with a pager motor in the keel, which would be narrow, deep and placed with the LE about mid-hull. The hull and keel slot together so a variety of keels could be tried.

I've got a slightly unusual hull in mind, not radical but leaving convention a little to the rear.

Would love to add a very small Shapeways metal folding prop. Metal so it would be just a bit heavy. When spun backwards Centrefugal force would hold the blades open so you could back up. Just a nice, weird additional touch. If I'm going to get into 3D, why not?

Pete
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Old Jul 16, 2012, 04:48 PM
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Thanks idoc.

Pete, check out some of the stuff I have here. The thinnest parts here go down to 0.35mm. You can't get that with metals. The minimum thickness for SS is 3mm. The folding prop is definitely an interesting idea and can easily be done. My props (below) are 12mm in diameter. I can scale them up, cut the blades and modify the blades and hub. If you are interested let me know.
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Old Jul 16, 2012, 05:18 PM
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Quote:
Originally Posted by boredom.is.me View Post
Thanks idoc.

Pete, check out some of the stuff I have here. The thinnest parts here go down to 0.35mm. You can't get that with metals. The minimum thickness for SS is 3mm. The folding prop is definitely an interesting idea and can easily be done. My props (below) are 12mm in diameter. I can scale them up, cut the blades and modify the blades and hub. If you are interested let me know.
Right now I have a bunch of 10mm props, maybe a lifetime supply, considering I'm seventy-four.

Sorry to hear that 3 mm is the thinnest for SS. I'd be more interested in brass, bronze or even silver if it could be made small enough. I'm thinking no bigger than the 10 mm I have now, but with a folding prop a large diameter not only wouldn't hurt, it might actually be more efficient. After all, low drag is why you fold the prop and once folded the diff in drag between various sizes doesn't matter.

Will look at the picture some more and try to figure out what's what.

Thanks

Pete
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Old Jul 18, 2012, 07:46 PM
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http://www.rcgroups.com/forums/showt...9#post22202274 ...Giggity
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Old Jul 23, 2012, 01:35 AM
PROFESSOR TRUTH JIMMY ICE
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I would like the cat... Cats are my preference...

Have you thought about 3D printing these... www.shapeways.com
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Old Jul 23, 2012, 07:23 AM
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I like cats too, but the vee (Scorpion) is inspired by the HPR Mono, which happens to be one of the two only vee hulls I like so it's a toss up. The vee come first though as that's what I should have in my hand later today.

Ya I kind of brought shapeways to the forum... 3D printing isn't really the solution to much though.
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Old Jul 29, 2012, 09:43 PM
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.OK.. well I figured that since people have been talking about doing things with Shapeways since 2008 that it might be a viable solution to printing a 3D hollow hull without having to go through the steps of making a buck and glassing it.... especially since you already have the 3D model...
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Old Jul 29, 2012, 09:45 PM
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It's not that easy though and the result is a very heavy hull that still needs quite a bit of work to be seaworthy.
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Old Jul 29, 2012, 09:48 PM
PROFESSOR TRUTH JIMMY ICE
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Heavy? even with 1mm wall thickness?

I'm just asking... I don't know since I've never made anything hollow or for water through them... and I know the minimum wall thickness on SW is 1mm
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Old Jul 29, 2012, 10:26 PM
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Actually it's .7mm. The issue is making the actual model uniformly hollow. Then after you make it, you have to seal it because it's porous. I guess if you are doing a scale model, then it would be the easiest option, but not for a race boat.
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Old Jul 29, 2012, 10:53 PM
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What about using Shapeways to make a form for a mold?

Pete
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Old Jul 29, 2012, 11:19 PM
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It is really hard to sand and properly smooth. You would have to make it thicker to deal with the natural stress of molding too. If you want detail, then you will definitely pay a hefty price. My mono would have been around $80 to get done, in good detail, for the three plugs.
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