BillL
Well Known Member
I was attempting to improve my cowl exit flow and needed to replace some heat shield. I had used some HVAC tape in the past, but it was not at the hangar so purchased some from the local hardware. It came off and added restriction to the flow and gave me higher CHTs in the first flight.
Here is a test of Vans shield, 3M tape, VentureTape 1520CW, and iTape. A large steel washer added for loading, and placed in the oven. 200F, 250F, 275F, 300F and 350F for 30 min each. The iTape dropped off 30 sec after beginning ramp above 200F. The remainder stayed attached and no drooping to 350F where smell in the kitchen terminated the test.
Conclusion(s): Be careful what tape you use. Vans is good stuff. 3M publishes 300F as the upper limit but maybe it was a more severe test. I would dangle from a horizontal surface if tested again - - like a peeling load.
Build on . . . .
Here is a test of Vans shield, 3M tape, VentureTape 1520CW, and iTape. A large steel washer added for loading, and placed in the oven. 200F, 250F, 275F, 300F and 350F for 30 min each. The iTape dropped off 30 sec after beginning ramp above 200F. The remainder stayed attached and no drooping to 350F where smell in the kitchen terminated the test.
Conclusion(s): Be careful what tape you use. Vans is good stuff. 3M publishes 300F as the upper limit but maybe it was a more severe test. I would dangle from a horizontal surface if tested again - - like a peeling load.
Build on . . . .
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