Go Back  RCU Forums > RC Boats > RC Boats General Discussion
Reload this Page >

Easy way to copy a hull

Notices
RC Boats General Discussion Discuss general rc boating topics here.

Easy way to copy a hull

Old 05-07-2009, 02:52 AM
  #1  
mineralvann
Member
Thread Starter
 
Join Date: Apr 2009
Location: , NORWAY
Posts: 89
Likes: 0
Received 0 Likes on 0 Posts
Default Easy way to copy a hull

is there a easy and cheap way to copy a 14in hull. Have tried searching but i only find guides on how to produce sturdy molds intended for multiple uses, and i only need one copy and want to keep it as cheap as possible. Is this practical at all or should i just give in and buy another.
Old 05-07-2009, 05:44 AM
  #2  
STEVE MARSHALL
 
Join Date: Jan 2007
Location: Perth, AUSTRALIA
Posts: 786
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

Why not mix up a batch of plaster-of- paris (spelling?) coat your hull in something to stop it from sticking,plonk the hull in and let it go hard and hey presto.
Just a thought.
Steve
Old 05-07-2009, 06:55 AM
  #3  
mineralvann
Member
Thread Starter
 
Join Date: Apr 2009
Location: , NORWAY
Posts: 89
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

yea i was thinking of something along those lines, but have no idea of what plaster of paris is or what i can use to coat the hull with. This is what i was thinking of making the mold with http://www.biltema.no/products/produ...?iItemId=96822 , its like epoksy and hardens after 1 hour. And how many layers of fiberglass do i need to make it though enough for a hull, is one enough considering its a very small hull?
Old 05-07-2009, 07:15 AM
  #4  
HendricX
Senior Member
 
HendricX's Avatar
 
Join Date: Jan 2009
Location: Rotterdam - NL
Posts: 686
Likes: 0
Received 1 Like on 1 Post
Default RE: Easy way to copy a hull

The non-sticking stuff is PVA ( PolyVinylAlcohol) ,
and for a cheap one-time mold ... go to the drugstore and buy 2 rolls of plastering bandage.

That stuff for broken limbs :-)

After that is cured .. give it 2 > 3 layers of epoxy , than you have your mold.
Old 05-07-2009, 10:13 AM
  #5  
mfr02
 
Join Date: Jul 2007
Location: Blackpool Lancs, UNITED KINGDOM
Posts: 1,432
Likes: 0
Received 32 Likes on 32 Posts
Default RE: Easy way to copy a hull

Plaster of Paris - that stuff covering most walls. Comes as a powder, mix with water, spread as required, leave until set.
Old 05-07-2009, 12:21 PM
  #6  
Dreamin Hemi
 
Dreamin Hemi's Avatar
 
Join Date: Nov 2004
Location: Milton, DE
Posts: 2,638
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

Not exactly the easy way out, but for multiple piece molds you could prep something like this.....oh, the green is PVA to make sure the white gelcoat I applied cures hard and not have a sticky surface. Check out my website linked in my sig line, it may inspire you to try something like what you are thinking of.

Layers of glass go on top of the "plug" and popped out to make your mold. Probably more work than you want to do, and definately the most expensive way but you get the best results.
Attached Thumbnails Click image for larger version

Name:	Nl29844.jpg
Views:	26
Size:	40.8 KB
ID:	1193877   Click image for larger version

Name:	Je10558.jpg
Views:	30
Size:	53.4 KB
ID:	1193878   Click image for larger version

Name:	Nk28025.jpg
Views:	24
Size:	47.9 KB
ID:	1193879   Click image for larger version

Name:	To43180.jpg
Views:	26
Size:	44.6 KB
ID:	1193880   Click image for larger version

Name:	Pn35979.jpg
Views:	25
Size:	44.1 KB
ID:	1193881   Click image for larger version

Name:	Bw73305.jpg
Views:	20
Size:	39.4 KB
ID:	1193882  
Old 05-07-2009, 12:30 PM
  #7  
Dreamin Hemi
 
Dreamin Hemi's Avatar
 
Join Date: Nov 2004
Location: Milton, DE
Posts: 2,638
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

Of course at 14", it may be cheaper AND easier to just purchase another hull!
Old 05-07-2009, 12:36 PM
  #8  
mineralvann
Member
Thread Starter
 
Join Date: Apr 2009
Location: , NORWAY
Posts: 89
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

ok thanks for all the answers, got a pretty good idea of what i need to do now. Not sure i'm going to save any money doing this but its a great feeling when you know you made something with your own two hands, especially if it works
Old 05-09-2009, 03:20 AM
  #9  
pompebled
Senior Member
 
Join Date: Jan 2004
Location: Sneek, NETHERLANDS
Posts: 2,451
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

Hi mineralvann,

As the hull is rather small, have you considered using silicone?

The company I work, sells it as a two part product (Silicone + hardener) to make a copy of damage at a crime scene.
I'm sure it'll work for a hull aswell, check out if you have something similar around in Norway.

Another option is the stuff that is used to protect machining tools during transport; it is liquid when heated and cures around the product, leaving a waxy/plastic-like surface.
I've seen it used to copy procucts aswel.
If you find a workshop that uses this stuff, see if you can make a deal to make a mold of your hull, laminate the product and return the material used, as it can be heated and melted again.

If the hull is ABS, forget it, the heat will deform it.

Regards, Jan.
Old 05-09-2009, 02:19 PM
  #10  
Tachikaze
Senior Member
 
Tachikaze's Avatar
 
Join Date: Jan 2004
Location: Eugene, OR
Posts: 116
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

Dreamin'
Nice that I stumbled across this, getting close to the stage for making the mold for a 1/72nd Surcouf and was looking for a nice article for using the plug to make copies. Thanks
Old 05-09-2009, 08:24 PM
  #11  
mineralvann
Member
Thread Starter
 
Join Date: Apr 2009
Location: , NORWAY
Posts: 89
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

Thats actually what im looking for, but the closes i have found yet is the product i posted a link to earlier where they use epoksy instead of silicone. Is the stuff you talk about commercially available and if so whats it called. I am a bit worried about if the epoksy, bandages or plaster of paris stuff will follow every crevasse and provide an exact copy. The reason for me wanting to copy the hull is that i am trying to make a micro jet drive boat with a flood chamber so im sure it will be a lot of trial and error and the original set me back about 180 dollars. But as dreamin hemi said "it may be cheaper AND easier to just purchase another hull"
Old 05-09-2009, 08:39 PM
  #12  
Dreamin Hemi
 
Dreamin Hemi's Avatar
 
Join Date: Nov 2004
Location: Milton, DE
Posts: 2,638
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull


ORIGINAL: Tachikaze

Dreamin'
Nice that I stumbled across this, getting close to the stage for making the mold for a 1/72nd Surcouf and was looking for a nice article for using the plug to make copies. Thanks
Your welcome.
Old 05-10-2009, 12:00 AM
  #13  
pompebled
Senior Member
 
Join Date: Jan 2004
Location: Sneek, NETHERLANDS
Posts: 2,451
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

ORIGINAL: mineralvann

Thats actually what im looking for, but the closes i have found yet is the product i posted a link to earlier where they use epoksy instead of silicone. Is the stuff you talk about commercially available and if so whats it called.
It's called "CROCELL SH25" (rather smelly) google for suppliers.
Or PREMEX 2001 Schmelztauchmasse, geruchs-neutral (non smelling)

You find that on page 29: http://premex.de/documents/k009_060710_pl.pdf

Regards, Jan.
Old 06-08-2009, 11:37 AM
  #14  
mineralvann
Member
Thread Starter
 
Join Date: Apr 2009
Location: , NORWAY
Posts: 89
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

thanks, appreciate it. This stuff looks very useful
Old 06-08-2009, 07:00 PM
  #15  
Tidnab
My Feedback: (51)
 
Tidnab's Avatar
 
Join Date: Mar 2005
Location: Houtzdale, PA
Posts: 1,198
Likes: 0
Received 8 Likes on 8 Posts
Default RE: Easy way to copy a hull

I have a 52" Eliminator hull that when I got it the deck wasn't on the hull bottom and I had an extra deck without a bottom.The guy who has the molds hasn't done any manufacturing yet,so I decided to make one out of wood.I know the hull bottom is 14" wide,so I'll use a contour gauge at different points on the hull bottom,where I'll put the frames inside the hull.The contour gauge can only shape half of the hull bottom at a time so I'll have to do the right half of the frame and flip the gauge over to get the left side,to make a full frame on paper as a pattern.I'll put frames at 6 or 7 places in the hull and stringers will tie these together.I'll have to figure out the keel after I get the frames made.If the fiberglass deck doesn't fit properly I'll just build a wood deck onto the hull bottom. http://www.right-tool.com/12steelpinco.html I'm just going to borrow one of these gauges from an auto body shop that has one .
Attached Thumbnails Click image for larger version

Name:	Ig12601.jpg
Views:	27
Size:	48.1 KB
ID:	1214637   Click image for larger version

Name:	Pl32311.jpg
Views:	27
Size:	79.9 KB
ID:	1214638  
Old 06-08-2009, 07:19 PM
  #16  
Dreamin Hemi
 
Dreamin Hemi's Avatar
 
Join Date: Nov 2004
Location: Milton, DE
Posts: 2,638
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

Your project sounds interesting. Never heard of anyone taking a glass design and recreating it with wood. When do you plan to begin?
Old 06-08-2009, 08:22 PM
  #17  
Tidnab
My Feedback: (51)
 
Tidnab's Avatar
 
Join Date: Mar 2005
Location: Houtzdale, PA
Posts: 1,198
Likes: 0
Received 8 Likes on 8 Posts
Default RE: Easy way to copy a hull

Hope to get started in the near future,after I get a few others things completed.I've built wood boats before but never tried this before.I have a small contour gauge ,but couldn't get the full shape of 1/2 of the hull bottom,so the bigger one with longer pins should do that.When I get started I'll post a few pics of the progress.
Old 06-08-2009, 08:55 PM
  #18  
Dreamin Hemi
 
Dreamin Hemi's Avatar
 
Join Date: Nov 2004
Location: Milton, DE
Posts: 2,638
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Easy way to copy a hull

Please do, and start a new thread.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.