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Post cure oven ideas

 
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tonyrenshaw268(at)gmail.c
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PostPosted: Sun May 03, 2020 2:00 pm    Post subject: Post cure oven ideas Reply with quote

Gidday,
It’s come the time for me to fill and sand my tailplanes. The manual throws up an immediate impediment to post cure them, wish I’d thought about that over summer because I could have just put them in the roof of my house which on a 40 degree day would have easily got to 50+ degrees Celsius, I think 50-55 degrees is the goal, if my memory serves me correctly, and yes I will check. Making an oven just for the tailplanes, does anyone have a suggestion of the best way to do this? I have an idea to use structural flooring plywood to make up a box and put a blow heater in there, plus thermometers and some way to swirl the air around so there are no hotspots. That’s not going to be easy to temperature control, so I was hoping builders might offer up ways I could do this, without it becoming a pizza oven into the future, keeping it simple would be a nice goal, of mine.
I do recall that the process is important that the temperature be ramped up slowly, and cooled down slowly, is that what others think too? Any help on ovens gratefully considered.
Regards
Tony Renshaw


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wdaniell.longport(at)gmai
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PostPosted: Sun May 03, 2020 4:00 pm    Post subject: Post cure oven ideas Reply with quote

Tony See my website.   I made an oven out of expanded polystyrene.  For heat i used a fan heater with a thermostat set for 40deg c.  The whole thing cost less than usd100.

William Daniell
+1 786 878 0246
On Sun, May 3, 2020, 18:03 Tony Renshaw <tonyrenshaw268(at)gmail.com (tonyrenshaw268(at)gmail.com)> wrote:

Quote:
--> Europa-List message posted by: Tony Renshaw <tonyrenshaw268(at)gmail.com (tonyrenshaw268(at)gmail.com)>

Gidday,
It’s come the time for me to fill and sand my tailplanes. The manual throws up an immediate impediment to post cure them, wish I’d thought about that over summer because I could have just put them in the roof of my house which on a 40 degree day would have easily got to 50+ degrees Celsius, I think 50-55 degrees is the goal, if my memory serves me correctly, and yes I will check. Making an oven just for the tailplanes, does anyone have a suggestion of the best way to do this? I have an idea to use structural flooring plywood to make up a box and put a blow heater in there, plus thermometers and some way to swirl the air around so there are no hotspots. That’s not going to be easy to temperature control, so I was hoping builders might offer up ways I could do this, without it becoming a pizza oven into the future, keeping it simple would be a nice goal, of mine.
I do recall that the process is important that the temperature be ramped up slowly, and cooled down slowly, is that what others think too? Any help on ovens gratefully considered.
Regards
Tony Renshaw


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alan.twigg775(at)gmail.co
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PostPosted: Sun May 03, 2020 9:54 pm    Post subject: Post cure oven ideas Reply with quote

I used the house insulation material, Celotex. 4” thick, built a box. I made a giant box for the fuselage. Hold the pieces together with kebab sticks and tape.
Alan

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Quote:
On 3 May 2020, at 22:57, Tony Renshaw <tonyrenshaw268(at)gmail.com> wrote:



Gidday,
It’s come the time for me to fill and sand my tailplanes. The manual throws up an immediate impediment to post cure them, wish I’d thought about that over summer because I could have just put them in the roof of my house which on a 40 degree day would have easily got to 50+ degrees Celsius, I think 50-55 degrees is the goal, if my memory serves me correctly, and yes I will check. Making an oven just for the tailplanes, does anyone have a suggestion of the best way to do this? I have an idea to use structural flooring plywood to make up a box and put a blow heater in there, plus thermometers and some way to swirl the air around so there are no hotspots. That’s not going to be easy to temperature control, so I was hoping builders might offer up ways I could do this, without it becoming a pizza oven into the future, keeping it simple would be a nice goal, of mine.
I do recall that the process is important that the temperature be ramped up slowly, and cooled down slowly, is that what others think too? Any help on ovens gratefully considered.
Regards
Tony Renshaw







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JonathanMilbank



Joined: 14 Apr 2012
Posts: 383
Location: Aberdeen area

PostPosted: Mon May 04, 2020 1:42 am    Post subject: Re: Post cure oven ideas Reply with quote

It's about 25 years since I did post curing of the wings and tail planes. Mine is a Classic with wings which needed about 1000 man hours of careful effort. I built a crude insulated "box" and placed two electric fan heaters to blow hot air in through small ducts low down at either end, being very careful not to allow direct blasts onto the flying surfaces.

In the early instruction manual was a warning from Ivan Shaw not to allow anything being cured to exceed 50C, lest the blue foam inside should swell and your carefully created masterpiece would transform itself permanently into the proportions of a Snickers chocolate bar. Also, if the wing was supported on trestles and left unattended in excessive heat, the resin would soften above 50C and the wing would sag between the trestles.

So it is highly recommended either to have thermostatic control of curing temperature, or to place a few thermometers against the pieces being post cured and to monitor the curing process at 15 minute intervals throughout the long hours. This I did by briefly opening the box each time and quickly reading the thermometers. I then adjusted the fan heaters as required, which meant that I was being the thermostat.


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rparigoris



Joined: 24 Nov 2009
Posts: 780

PostPosted: Mon May 04, 2020 6:00 pm    Post subject: Re: Post cure oven ideas Reply with quote

Hi Tony

I sewed up plastic sausage for tailplanes and rudder. Using a 1,500 watt electric heater that oscillates back and forth. I had to disassemble and mutilate the thermostat to operate at temp required. Using a muffin fan to inflate and have several thermometers to monitor temp. Draping packaging bubbles allows yo to get temp just right.:
http://www.europaowners.org/main.php?g2_itemId=27216
Works great and packs into a very small package when not in use. BTW check out inflatable painting in same folder. Ron P.


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