I am installing a fiberglass coupler into a fiberglass airframe. I have long used a coupler-airframe overlap length of about 1-1.5 calibers for the separating end of the coupler - that is, how much coupler projects out from the airframe. Up until now I have just used the same overlap for the end of the coupler that is epoxied into the other section of airframe. I would like some input as to how little of an overlap would be "required" to adequately secure a coupler tube to the fixed side of the airframe/coupler joint.
If I have a 4" airframe, would 2" (.5 caliber) of epoxied overlap be sufficient assuming a full good epoxy bond between the coupler and airframe? Could I use something less, do I need something more? This particular location is at the forward end of a fincan with a zipperless design.
I understand that the length of the overlap on the un-epoxied side helps maintain airframe integrity across the joint, but for the epoxied side, just how little overlap have you had success with? I am interested in maximizing the overlap on the loose side by adjusting the depth of the bonded side.
Looking mostly for real-life experience here, I do appreciate opinions, but I would like to know what has worked (and has not worked) for folks.
Thanks.
Robert
If I have a 4" airframe, would 2" (.5 caliber) of epoxied overlap be sufficient assuming a full good epoxy bond between the coupler and airframe? Could I use something less, do I need something more? This particular location is at the forward end of a fincan with a zipperless design.
I understand that the length of the overlap on the un-epoxied side helps maintain airframe integrity across the joint, but for the epoxied side, just how little overlap have you had success with? I am interested in maximizing the overlap on the loose side by adjusting the depth of the bonded side.
Looking mostly for real-life experience here, I do appreciate opinions, but I would like to know what has worked (and has not worked) for folks.
Thanks.
Robert