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  #11  
Old 03-02-2023, 01:12 PM
Tramper Al Tramper Al is offline
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Quote:
Originally Posted by 5x7
It’s likely the injection temp given is under pressure so 150 degrees will likely do nothing at normal pressure, but I respect wanting to preserve this rare fin can.


Yeah, those temps seem low (car parked in the sun?), but I'll work my way until I see some changes.

There is also something called a heat deflection temp that is up closer to water boil but still well below melting point. That may be the one I'm after, when the shape is workable.

Plastics.

Last edited by Tramper Al : 03-03-2023 at 05:15 PM.
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  #12  
Old 03-03-2023, 06:50 AM
Tramper Al Tramper Al is offline
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Just a quick follow-up on my 1340 fin can straightening effort.

It all happened at 75 C (about 170 F), water bath, well clamped in Estes jig. I kept them in for about an hour at each (increasing) temperature, and let the last one cool down overnight. Straight and still like new. No kidding, these are the same fins.

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  #13  
Old 03-03-2023, 07:11 AM
A Fish Named Wallyum A Fish Named Wallyum is offline
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Quote:
Originally Posted by Tramper Al
Just a quick follow-up on my 1340 fin can straightening effort.

It all happened at 75 C (about 170 F), water bath, well clamped in Estes jig. I kept them in for about an hour at each (increasing) temperature, and let the last one cool down overnight. Straight and still like new. No kidding, these are the same fins.


Wow. That's impressive!
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  #14  
Old 03-03-2023, 07:40 AM
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5x7 5x7 is offline
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Great job!!
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  #15  
Old 03-03-2023, 04:32 PM
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BEC BEC is offline
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Quote:
Originally Posted by A Fish Named Wallyum
Wow. That's impressive!

+1

Well done!
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  #16  
Old 03-03-2023, 05:31 PM
SolarYellow SolarYellow is offline
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Straighter than some fins I've seen come out of new Estes packages.
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  #17  
Old 03-03-2023, 06:00 PM
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ghrocketman ghrocketman is offline
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That was too easy and results in a PENALTY.
Looks too good; at LEAST one fin needs a touch of WARPAGE. Paint the fin can with brushed-on Aero Gloss Dope. Thaty'll add some warpage back for sure .
You needed to heat each fin individually with a heat gun instead.

Seriously though, it came out better than expected. Looks great.
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