Solar oven, Part Deux: Utter failure!

In retrospect, I should have checked the weather reports. All started well. The sun was out at around 9 a.m. when we put the solar oven out to cook carrots and potatoes for a soup. But then, clouds appeared. When we checked our soup about five hours later, the ingredients were still raw.

I blame it on the weather, but I can't help but think it was an engineering failure as well. Even when the sun was out in the morning, it didn't look like the oven was getting any hot. I should just bite the bullet and buy a solar over made by the professionals at Border Partners...