Smaller wings (<10%) will demonstrate greater flex. Probond's elasticity
may not be appropriate here. However, >12% or larger it is excellent as
a wingskin adhesive.
Adhesive itself adds little, if any, "strength" to a matrix. Although
epoxy has a higher yeild point (modulus) than Probond, it does not mean
it is stronger. Probond can add depth to the bond between itself and
open-cell foam as it expands and catalyzes. This adds cross-sectional
area between the skin and the foam, which increases resistance to
compressive loads. Probond is used extensively in the large scale
aerobatic arena to adhere balsa sheeting to foam cores. Keep in mind
that water is the catalyst, and drier climates may require atomized
water to (properly) catalyse. Use it sparingly, and plenty of weight, as
it expands.
"Tony J. O'Hara" wrote:
>
> Hi Jason
> Your coments about Probond "(it) never gets stiff to the point of creating
> an additional structure. "
> Makes me wonder now, if I should use it for joining balsa-skinned foam wing
> sections like I was planning?
>
> Tony
> Colorado
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Simon Van Leeuwen, Calgary, Alberta
RADIUS SYSTEMS
Cogito-Ergo-Zoom
IAC25233*MAAC12835*IMAC1756*LSF5953*IMAA20209
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