If you have been following our blog as of late or have looked at our NAMC Recommended Parts List, you know that we are big fans of Foam Cure by Bob Smith Industries, the same glue sold under different labeling by Hobby King.
I have already written a couple of blog articles which appear on our old blog that you can read here giving my impressions of Foam Cure during some recent builds and lessons that I learned.
Building with Foam Cure - lessons learned
Building with Foam Cure - more lessons learned
Today at the field, I reached the 50 flight milestone with this NAMC Mig-35 which I built almost completely with Foam Cure. I did use a dab or two of hot glue to "spot weld" while the Foam Cure set up when shaping the nose and I did use five minute epoxy for the control horns and motor mount and 3M Super 77 spray adhesive for attaching the KF airfoils. All other construction including securing the carbon fiber reinforcements and all hinges (using fiberglass mesh drywall tape as the hinge) was done with Foam Cure.
I should add that this plane gets stored in my garage, so it is often "cold soaked" to about 0 C/32 F on a regular basis and has been flown in temps as low as 2 C/35 F. I mention this as cold weather can be especially hard on foam and adhesives and their durability. Thus far I have noticed no adverse affect in any of the glue shrinking or cracking like sometimes can happen with other glues like hot glue or sometimes epoxy.
This plane has been flown at a weight of about 21 oz, so not a high wing loading, but with the speed and aggressive aerobatics I have put it through during the first 50 flights, the glue joints have been very well tested. I am very happy to say that the plane feels as solid now as it did the day it flew it's maiden flight. I gave it a very thorough inspection today after it's 50th flight and felt no flex in any of the joints, saw no cracks in the glue joints or where it holds the hinges to the control surfaces. The plane is very solid and strong, as though it was brand new.
I like how the plane feels in my hand when I handle it, nothing flexes like sometimes happens with other popular foam glues that dry flexible. I have to say I like that solid feel in my planes, it gives me confidence that when I want the plane to do something, the energy is going into doing that maneuver, not dissipating or being wasted because glue joints are flexing.
So thus far, Foam Cure continues to be a real winner for me as my newest and most favorite glue for building my park jets. As I continue to log more flight time on this plane, I will continue to provide further durability updates.
UPDATE: On 18 March 2015, I surpassed 100 flights with the plane in the picture above and all the Foam Cure glue joints are still holding up amazingly well. I have not noticed any sign of flex or fatigue in any of the glue joints or hinges, everywhere I put Foam Cure is holding up as well as the first day I flew this plane. I am very happy with it's toughness and durability through this many flights and colder temperatures.