I might be over-thinking this...so if I am, please let me know. What concerns me is that the screws holding on the doors on the -10 are simply #10 flush screws into fiberglass. I've heard anecdotal evidence of screws and fiberglass not working well (wallowing out over time) in other locations (cowling, wheel pants, fairings, etc)...but haven't about the -10 door. So is this a big deal or not?
My preliminary mitigation plan involves epoxying Tinnerman washers into the fiberglass, but it doesn't come without second order effects.
Here are some facts:
Tinnerman washer is 0.114 tall, which includes the countersunk depression
Tinnerman "lip" is 0.030 tall
Fiberglass is two layers and a total of 0.100 thick
From the picture below, you can see my test piece and plan to router out the 0.030 thickness so that the washer fits flat. And although the math doesn't work, I can have the Tinnerman washer flush on the top, and the bottom doesn't extrude. So there is some variability in my measurements.
In the end, it should be something like this.
What do you all think of this plan? An absolute must do? Don't bother? For those who have already painted...did you paint the screws in place? Was it painted with the doors open or closed?
Thanks for the insight!
-Jim
My preliminary mitigation plan involves epoxying Tinnerman washers into the fiberglass, but it doesn't come without second order effects.
Here are some facts:
Tinnerman washer is 0.114 tall, which includes the countersunk depression
Tinnerman "lip" is 0.030 tall
Fiberglass is two layers and a total of 0.100 thick
From the picture below, you can see my test piece and plan to router out the 0.030 thickness so that the washer fits flat. And although the math doesn't work, I can have the Tinnerman washer flush on the top, and the bottom doesn't extrude. So there is some variability in my measurements.
In the end, it should be something like this.
What do you all think of this plan? An absolute must do? Don't bother? For those who have already painted...did you paint the screws in place? Was it painted with the doors open or closed?
Thanks for the insight!
-Jim