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Wednesday, April 11, 2007

Rivetted and epoxied seams

Tonight I rivetted and epoxied the seams of all the cones. First I created the test seam on the right to see if I was happy with the results. Later before painting I will fill and sand flush the seams so that they are as flush as possible.

2 comments:

Anonymous said...

i'm trying to figure out aerodynamically if it makes sense to put ventilation holes in the cone to equalize the pressure from the underside of the cone to the top (or even create a slight vacuum due to venturi effect over the holes). These won't do much good if they lift and flip (and of course there's nothing you can do about debris hitting them.

Joe Pohlen

Eric Carlson said...

"i'm trying to figure out aerodynamically if it makes sense to put ventilation holes in the cone to equalize the pressure from the underside of the cone to the top (or even create a slight vacuum due to venturi effect over the holes). These won't do much good if they lift and flip (and of course there's nothing you can do about debris hitting them."

You'd have to be careful about how and where you place the holes. While it would reduce surface friction, angular winds on the holes might cause air to curl up and stack up inside the cone - building up pressure inside and increasing the chance for the cone to flip over. The point of the cone shape is to increase the pressure differencial on the outside and push the cone down.

If I were to change some details on the probes I would taper the top and perhaps attach some kind of rubber skirt to create the best possible seal with the ground.

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