Ok guys, with the canopy closed on the ground, the RV-12 is hot! (even with the vents open) To remedy the problem , I have come up with a spring loaded block that holds open the canopy a small amount allowing prop air to cool the cockpit. just hold the block down and the weight of the canopy holds it in place. Just push up on the canopy and the block flips up out of the way. With the block in place, the canopy is stable between the aft guide blocks. The spring is cut to the right length after installation and the last eye is bent 90 deg for the screw. The pictures in the link show it all. https://picasaweb.google.com/nctaylor1/20110328#