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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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 Posted: Sun Nov 01, 2015 11:02 am Post subject: Post Curing Adventures |
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Although my mantra of all things aviation is “...to manage the degree of novelty...”, my shortcomings as a manager were revealed recently when I attempted to post cure my custom made cowlings which I’d made using a special high temperature, fire-retardant resin.
The specs…verified via email confirmation w/ the manufacturer…call for a robust post curing protocol:
1 hr (at) 150 degrees F., 1 hr (at) 200, 1 hr (at) 250, 1 hr (at) 300, and 2 hrs (at) 350 degrees F…essential for achieving the (presumably desirable) hi temp & fire-retardant attributes.
A pal who hand builds bicycles has a suitable oven used for powder coating which has the requisite temp. range, controls, monitoring, and built-in timers complete w/ red lights and loud buzzers.
Nonetheless, halfway thru the cycle, after finding large blisters, deformation, and some evidence of delamination, I promptly shut down the oven and removed my top cowl.
Based on the pattern of blisters and deformation, it’s apparent that the “Last-A-Foam” stiffeners on the cowl’s interior did not take kindly to the high temperatures during post cure…but the truth is, I don’t really care what caused the damage…my goal is to salvage the cowl and continue reducing the number of days between today and first flight.
As for “post-curing” my cowls, I am content w/ the notion that the heat generated by the engine & exhaust will suffice.
Fred
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klinefelter.kevin(at)gmai
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| Posted: Sun Nov 01, 2015 7:57 pm Post subject: Post Curing Adventures |
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Go Fred go!
Kevin
| Quote: | On Nov 1, 2015, at 9:01 AM, Fred Klein <fklein(at)orcasonline.com> wrote:
Although my mantra of all things aviation is “...to manage the degree of novelty...”, my shortcomings as a manager were revealed recently when I attempted to post cure my custom made cowlings which I’d made using a special high temperature, fire-retardant resin.
The specs…verified via email confirmation w/ the manufacturer…call for a robust post curing protocol:
1 hr (at) 150 degrees F., 1 hr (at) 200, 1 hr (at) 250, 1 hr (at) 300, and 2 hrs (at) 350 degrees F…essential for achieving the (presumably desirable) hi temp & fire-retardant attributes.
A pal who hand builds bicycles has a suitable oven used for powder coating which has the requisite temp. range, controls, monitoring, and built-in timers complete w/ red lights and loud buzzers.
Nonetheless, halfway thru the cycle, after finding large blisters, deformation, and some evidence of delamination, I promptly shut down the oven and removed my top cowl.
Based on the pattern of blisters and deformation, it’s apparent that the “Last-A-Foam” stiffeners on the cowl’s interior did not take kindly to the high temperatures during post cure…but the truth is, I don’t really care what caused the damage…my goal is to salvage the cowl and continue reducing the number of days between today and first flight.
As for “post-curing” my cowls, I am content w/ the notion that the heat generated by the engine & exhaust will suffice.
Fred
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