By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

Foams and Glues

Includes articles by others

All Topics | Latest Posts

Search for:  in Thread Title in  
Bob Cotsford27/07/2017 11:04:12
avatar
7399 forum posts
419 photos

No need for foam-safe CA on this, it's an EPP type of foam so any CA will be ok. Chuck, as the Carbon-Z Cub is 80 odd inches and 8lb weight for 6S I would really think twice before recommending a glue line hinge, they may be fine for small models but this ain't small!

John Lee27/07/2017 13:10:11
543 forum posts
42 photos

The Carbon-Z Cub has mylar hinges pre-fitted to the rudder which need gluing into the slots in the fin.

Geo have another look at the Rudder Installation section (page 9) of the instructions. There is a box at the top of the page which states 'Required Adhesives: Thin CA'.

I'd confirm, as Bob says, that standard CA is suitable, indeed I find it better than foam-safe on the EPP foam used by E-flite. I used thin Zap in the pink bottle which 'wicks' in nicely. Afraid I totally disagree with Chuck Plains.

Great flying model, I'm sure you will enjoy it.

Chuck Plains29/07/2017 08:07:52
avatar
1082 forum posts
241 photos

Ah, points taken gentlemen. Anyone who read my post, please ignore it!!!!!!!!! wink

8lbs ?! That is heavy for a foamie. I did check out a thread on RC Groups, but didn't spot any talk about the nature of the foam.

My only experience with mylar hinges was nearly 4 years ago on an Easy Pigeon glider. They weren't pre-installed and I didn't know what they were, so I used reinforcing tape.

Bob Cotsford29/07/2017 11:09:13
avatar
7399 forum posts
419 photos

Here you go Chuck, not your average foamie with a 50 size motor running on 6S.

Mike Etheridge 110/07/2018 23:29:46
1443 forum posts
399 photos

Anyone know where I can obtain a small quantity of Elapor foam to repair the nose on my 12 year old Twinstar 2 that was involved in a 'Mid Air' crash last week at very high level. The crash was nose to nose with a Radian XL 2.6 M and all the debris was lost in a Jungle adjacent to the flying Field ?

p7070316.jpg

Edited By Mike Etheridge 1 on 10/07/2018 23:34:54

Edited By Mike Etheridge 1 on 10/07/2018 23:39:58

Erfolg12/07/2018 10:57:08
avatar
10980 forum posts
1065 photos

I ma not sure when i built this model, it is now some years ago, at least 5, I would guess getting on for 10. It is flown normally twice a week.

It is made from Depron, the adhesives used were very conventional. The sheet is held together with PVA. The surface initially roughened with sand paper. Then weighted down.

newnose2.jpg

It was then covered in lightweight glass cloth, using a Water Based Varnish.

The hinge is just the foam cut away, to form a bottom hinge.

It has now suffered two serious crashes over the years, and has been easily repaired.

newnose1.jpg

Obviously the nose.

wp_20160502_15_11_36_pro.jpg

New wing tip.

wp_20160331_10_33_40_pro.jpg

The old tip., before repair, after collision with a tree, then falling to the ground.

This model is now also pretty old, made from EPO, when assembled Screwfix No-nonsense Cyno was used.

In recent years it has suffered a lot. The first issue was a wing spar adhesive failing in flight. This appeared to be some form of contact adhesive, possibly similar to UHU POR. Very recently the rear motor broke loose, demolishing a good part of the tail. In this case, the plywood mount had delaminated.

For repairs I have used Gorilla Polyurethane glue. Also copious amounts of Cyno, all the cheap stuff from either Screwfix or Toolstaion. I have found that as an adhesive Gorilla is no better than the other stuff, although massively expensive in comparison. The other side of the coin, is that the shelf live seems to be much greater. Although another club member has said otherwise.

Sadly, EPO seems to have a user life, as various cracks in the foam have appeared, at high stress points around the wing seat corners. Also the adhesives used by the manufacturer are also failing, the body halves separating. It now is incredibly tatty, yet again it keeps on going.

Engine Doctor12/07/2018 11:29:21
avatar
2016 forum posts
20 photos
Posted by Mike Etheridge 1 on 10/07/2018 23:29:46:

Anyone know where I can obtain a small quantity of Elapor foam to repair the nose on my 12 year old Twinstar 2 that was involved in a 'Mid Air' crash last week at very high level. The crash was nose to nose with a Radian XL 2.6 M and all the debris was lost in a Jungle adjacent to the flying Field ?

p7070316.jpg

Edited By Mike Etheridge 1 on 10/07/2018 23:34:54

Edited By Mike Etheridge 1 on 10/07/2018 23:39:58

Just make a new nose cone from light balsa scrap glued into a block then hollow with a Dremel . Probably easier than working with foam ?

Erfolg12/07/2018 13:02:09
avatar
10980 forum posts
1065 photos

I do not think it has been mentioned, that Blue Foam was used to produce wing cores in the dim distant past. In many if not most cases the wing would be covered in "Christmas or Birthday wrapping paper". The adhesive used was generally a cellulose wallpaper paste such as Polycell. This arrangement resulted in a very strong wing. I never saw any fail, even under severe towing or line screaming Bungee launches.

I think Phoenix Wonder Wings 100s was one model intended to use the system.

Roo Hawkins12/07/2018 13:54:21
72 forum posts
34 photos
as a builder of large scale gliders in the 4 to 6 meter range I use a lot of foam.pink foam from b&q is not available now for the last 3 years. Dow chemical is also not making blue foam has well.I rang Sheffield insulation and thy only had some in stock at Bedford only. And only 9 sheets so I now have 9 sheets hidden in my workshop. Dow are now doing it in black and sig areally only selling it in orders ? 250only.the building industry are using less of it now.

Edited By Roo Hawkins on 12/07/2018 13:55:02

Edited By Roo Hawkins on 12/07/2018 13:56:56

Edited By Roo Hawkins on 12/07/2018 13:57:50

ken anderson.12/07/2018 15:32:29
avatar
8094 forum posts
729 photos

hello ed,have a look for some of the stuff they use for packing TV's in their box's with....or go down to the local council recycling depots...bet you find some there....

ken anderson....ne….1. recycling dept.

Erfolg12/07/2018 16:01:25
avatar
10980 forum posts
1065 photos

It is a great loss that Blue Foam. or "Dow Corning Floor Mate" when I purchased it from Sheffield Insulation, is no longer being sold. Is that the UK or World Wide?

I have repeatably intended getting a sheet, only forgetting to do so. Such a pitycrying 2

Robert Cracknell12/07/2018 16:25:32
94 forum posts
6 photos

Erfolg

 

Try here....**LINK**

or

here...https://www.panelsystems.co.uk/product/floormate?attribute_pa_group=floormate-500a&attribute_pa_product-name=floormate-500a-2&attribute_pa_length=1250&attribute_pa_width=600&attribute_pa_thickness=50&attribute_pa_unit-of-sale=pack-8-brds6m2&attribute_pa_min-order-qty=6&gclid=EAIaIQobChMIiNKN-u6Z3AIVQ7cbCh1EJw-BEAQYAyABEgKMNfD_BwE

Edited By Robert Cracknell on 12/07/2018 16:27:48

Roo Hawkins12/07/2018 16:55:33
72 forum posts
34 photos
I know about them it is a minimum order of 6 packs at more than ?100 a pack. Plus they are going to the black stuff.

Edited By Roo Hawkins on 12/07/2018 16:56:35

Robert Cracknell12/07/2018 17:00:57
94 forum posts
6 photos

Perhaps you could all group together via the forum to put in a minimum order before it goes....

Erfolg12/07/2018 17:32:21
avatar
10980 forum posts
1065 photos

It does seem that the material is available still. I bought was then called X200, which I guess is related to a measure of density.

I think you are correct now that Sheffield Insulation are no longer stockists.

The idea of getting together a number to purchase a pack of sheets is good. The supplier also needs to be local to make the delivery. When i bought my single sheet I had to cut it into half, to get into a a hatch back type configuration.

Mike Etheridge 112/07/2018 17:37:45
1443 forum posts
399 photos

ED's balsa solution was one that I favoured , but what about Depron , I have never used or owned it , but does it have similar properties to Elapor foam ?

I was hoping someone had a written off Twinstar or an other Multiplex model ?. Surely Multiplex should be able to provide a quantity of Elapor foam ?

Thanks for the other responses I will have a closer look at them.

Robert Cracknell12/07/2018 17:49:37
94 forum posts
6 photos

Jewsons are pretty much countrywide.....

**LINK**

Erfolg12/07/2018 18:20:36
avatar
10980 forum posts
1065 photos

Although EPO, which Elapor is in principal, is used extensively in the motor industry, I could not find a UK trade supplier when i wanted to build Foamy Daves Biplane (free RCM&E plan). Some UK model shops did stock the material, though it was priced as if made from gold.

Eds solution works for me, as does Depron. The trouble with Depron, it does not pass any positive comparison with EPO.

Have you thought of using boiling hot water, I did this when my Nitro Models Dornier 335 when it hit terra Firma, which is made from EPO, It regained most of its previous shape. I then filled it with Light weight filler,

McG 696912/07/2018 18:33:21
avatar
2231 forum posts
933 photos

Hi Mike,

If I'm allowed a point of view, ED's balsa is a good one. yes

I wouldn't go for Depron in this case as you need to laminate a lot of layers to get a sufficient thickness.

But have a look at Erfolg's nose repair of his pusher jet. angel

Just a vertical central layer of thin ply to give you a sanding guide, sandwiched by two bits of blue foam. Job's done! wink

Robert C's advice above could point you in the right direction to get some blue foam as well.

Cheers

Chris

Mike Etheridge 113/07/2018 12:06:57
1443 forum posts
399 photos

Repair underway having used the hot water technique recommended to return the Elapor foam to it's original non-compressed shape--it did work !. So far I have added some light balsa to the fuselage fixed with Medium Cyno and filled the gaps with Ronseal wood filler. The sanding process is next and the plane should be ready for flying on Sunday. Thanks again for the advice chaps.

p7120318.jpg

Edited By Mike Etheridge 1 on 13/07/2018 12:08:23

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E! 

Latest Forum Posts
Support Our Partners
Motion RC
Wings & Wheels 2018
Overlander
electricwingman 2017
Expo Tools 14 July
Gliders Distribution
Slec
Airtek Hobbies
CML
Advertise With Us
Sarik
Latest "For Sale" Ads
Which part of building a new traditional balsa aeroplane do you enjoy the most?
Q: Which part of building a new traditional balsa aeroplane do you enjoy the most?

 Research & choosing the model
 Building the fuselage
 Installing the engine and radio systems
 Building the flying surfaces
 Covering/painting/finishing
 All of it!
 None of it. I'd rather someone else did it!
 Other

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us