WhiteRook

My Feedback: (38)

do most people put their wings in both shucks .? i'm thinking i should sheet the tops and bottoms
of the wings while their in the shucks with weight on top. last time i tried polyurethane glue, never again. any ideas would be apreciated


thanks

Props4ever

Here is a thread that will help you...

http://www.rcuniverse.com/forum/m_5009047/tm.htm

mmattockx

The Bible for sheeting foam wings:

http://www.mackrc.net/patternwings2/index.htm


What was it about the PU glue you didn't like? Properly used it makes an excellent wing sheeting glue, but it does have it's quirks. A lot of people use epoxy laminating resin with excellent results, as well. Before PU glues, epoxy was the lightest choice and is still a good way to go.

You always sheet cores in the shucks, unless you have no option. You can either use weights and flat boards on the shucks or vacuum bagging to apply pressure to the skins and cores while the glue cures. Either way, you need a dead flat table and top board or you will build in a warp that does not come out after the glue is cured. If using weights, use far more weight than you think is necessary - 200+lb is a good place to start for medium sized wing panels (say 250+sqin). If you think that sounds like too much, consider that 7in of vacuum is equivalent to 3.4psi and will apply a force of 1700lb to a 500sqin wing panel. All without damaging the foam core.


Mark

slopemeno

My Feedback: (2)

PU is a great way to sheet a set of wings. I did two sets back in 1998 that are still going strong after lots of cartwheel-thru-the LZ type crashes.

Lots of weight is key, but as I recall I used about 2-3 cases of beer and it worked with no problem. For the weight, that is..

kdc

In Britain most foam wings are veneered with obeche veneer instead of balsa. We use a contact adhesive such as Copydex ( latex ) which is diluted with water and applied to foam and veneer and left to dry. After 15 to 30 minutes the glue dries and the veneer is applied to the foam. Then the excess veneer is trimmed.

Very different to your method. Lasts well too.

jvigani

Pu is my adhesive of choice for sheeting wings. It's light, cures faster than epoxy, and gives a great bond. I have done it by weighting the shucks and by vacuum bagging. I prefer the vacuum bag method. I use 8 inches of vacuum. Here's some shots of my latest project using PU. 1/16 inch balsa over 1 lb foam core.