HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jan 20, 2011, 09:08 PM
Yes, I know it's upside down.
Sydney, Australia
Joined Dec 2008
3,299 Posts
I have never used it myself, but have heard the PVA wood/craft glue works okay on foam, and would probably be the easiest to use on these large surfaces. Easy to spread without needing to rush. Would be easy to test.
Harrow is offline Find More Posts by Harrow
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 20, 2011, 09:57 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,488 Posts
All4,
I really like the Foam Tac, but spreading it would be a pain at this scale.

Harrow,
What brand would you recommend? A few hours ago, I put two scrap pieces together with the Elmers Wood glue. I just pulled them apart without any force. The surface area of the joint is/was 24 sq.in.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Jan 21, 2011, 04:45 AM
Yes, I know it's upside down.
Sydney, Australia
Joined Dec 2008
3,299 Posts
Had it dried properly? I'm guessing that stuck between two pieces of foam it has little exposure to air, and may therefore be slow to dry, possibly needing to be left overnight. You'd want to spread it thin to assist the drying, but I must say that this all just hypothesising and speculation on my part, as I have not tried it myself.

Foam safe CA should also work, but being exposed to CA over a large surface like that is going to burn your eyes and lungs out!
Harrow is offline Find More Posts by Harrow
Reply With Quote
Old Jan 21, 2011, 08:02 AM
Founder of the EDF20 club!
all4smallrc's Avatar
Minnesota
Joined Apr 2008
3,261 Posts
CA is brittle too. I wouldn't use it.
all4smallrc is offline Find More Posts by all4smallrc
Reply With Quote
Old Jan 21, 2011, 10:49 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,488 Posts
I added new pics to the fourth post.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Jan 22, 2011, 02:46 PM
Registered User
crappie depot's Avatar
Michigan
Joined Jan 2011
11 Posts
I say go with the epoxy for the simple reason of the scale at which you are building. If you apply a thin coat to both mating sufraces it will hold fine. Plus you can buy in larger volume. If the weight of the glue prevents you from hovering, then you've got bigger issues to worry about.
crappie depot is offline Find More Posts by crappie depot
Reply With Quote
Old Jan 22, 2011, 02:55 PM
Registered User
crappie depot's Avatar
Michigan
Joined Jan 2011
11 Posts
Have you considered Great Stuff foam? It may not work on every application but should do well when building up layers. Verdon Weber uses it building his Star Cruisers, but he also laminates with fiberglass.
crappie depot is offline Find More Posts by crappie depot
Reply With Quote
Old Jan 22, 2011, 03:47 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,488 Posts
Quote:
Originally Posted by crappie depot View Post
I say go with the epoxy for the simple reason of the scale at which you are building. If you apply a thin coat to both mating sufraces it will hold fine. Plus you can buy in larger volume. If the weight of the glue prevents you from hovering, then you've got bigger issues to worry about.
Quote:
Originally Posted by crappie depot View Post
Have you considered Great Stuff foam? It may not work on every application but should do well when building up layers. Verdon Weber uses it building his Star Cruisers, but he also laminates with fiberglass.
I completely agree with what you are saying, but the weight of the epoxy is not the issue. The issue is the accumulated weight of all the little unnecessary weights.

Say you are building a 10 gram model, but slightly go over that because of the lack of consideration for all the unnecessary weight. You have an unnecessary 0.3g in the battery installation, an extra 0.2g in wiring, an extra 1g in glue, a messy solder job adds 0.2g, and you cut corners by getting a generic building material which weighs more than stated, which ends up being an extra 0.5g. That is an extra 2.2g resulting in a final weight of 12.2 grams. This is just a broad example, but it expresses my point.

For this reason, I am really liking the Great Stuff.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Jan 23, 2011, 05:43 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,488 Posts
I got more work done, but very little due to my asthma. Refer to post #4. I picked up a potential sponsor on Friday.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Jan 25, 2011, 03:14 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,488 Posts
I think I will go with Gorilla Glue. The stuff is strong, light, and does work on foam. I see iy as the median between epoxy and great stuff.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Jan 25, 2011, 03:49 PM
Founder of the EDF20 club!
all4smallrc's Avatar
Minnesota
Joined Apr 2008
3,261 Posts
The only problem I see with Gorilla Glue is that it expands as it dries. You will need to make sure the pieces are pressed together hard during the drying process to prevent them from separating.
all4smallrc is offline Find More Posts by all4smallrc
Reply With Quote
Old Jan 25, 2011, 04:08 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,488 Posts
I'll get a bench press weight set from a friend. No separation will occur. I am also getting mixed opinions with the gorilla glue too.

I do not know what glue to use!!! Should I sacrifice some lightness and use epoxy? Should I dump a bunch of money into Foam Tac (Beacon)? Should/Can I trust Gorilla? I am going to home depot in a few so the decision will be made there.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Jan 25, 2011, 08:29 PM
Yes, I know it's upside down.
Sydney, Australia
Joined Dec 2008
3,299 Posts
Gorilla glue is polyurethane, isn't it? The stuff sets by being exposed to moisture, I believe. When doing a large area of foam, I have heard of people giving one of the sides a very light mist spray of water and then wiping it down, then applying the glue to the other side and bringing the two sides together. The remnant moisture on the sprayed and wiped side helps it set well. Don't trust what I just said, but do a little research and see if this is what you are meant to do.

Once it sets, I think it will be stronger than the foam it is attached too. Again, easy to do a test and convince yourself. In fact, I'd say a necessity considering the large size of the job you are about to undertake.
Harrow is offline Find More Posts by Harrow
Reply With Quote
Old Jan 25, 2011, 10:19 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,488 Posts
I have already tested and have confirmed that Gorilla is my choice. This stuff is strong and its expansive properties fill the little gaps in the foam which give the glue more grip area. You are right though about how the process is done.

How it is done:
1) make sure the surfaces are clean
2) wipe a damp cloth over one of the surfaces
3) apply glue to one surface and leave exposed for about 5-10 minutes
4) press and hold together

For step three, I will use a plastic taping knife (I'm using it as a squeegee) to spread the glue over the entire surface.
For step four, I am using weights from a bench press weightlifting set.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Jan 26, 2011, 07:53 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,488 Posts
I laminated the outer spacers.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
New Product Carbon/Kevlar RC Racing hovercraft with [b]FULL ARTICULATED FIGURE ! camoesas RC Hovercraft 40 Jun 20, 2013 11:45 PM
Question JR X 347 Full house electric glider Graham 65 Electric Sailplanes 3 Nov 11, 2010 01:52 PM
Discussion Looking for MG servo Size: 0.9 x 0.4 x 0.9" (22 x 11 x 22mm) johnnyrocco123 High Performance 3 Oct 09, 2010 10:06 PM
Discussion Full size electric aircraft at EAA Fly-IN..time to start on a full size F-22;) Ed Waldrep Electric Ducted Fan Jet Talk 9 Aug 05, 2008 06:53 PM
For Sale Full size hovercraft for sale - trade nitromark Non R/C Items (FS/W) 18 Jan 21, 2007 03:54 PM