Post by -=CROMAN=- on May 1, 2012 13:07:51 GMT -6
I decided to put together a sun funnel today since I was at home sick. I had all the pieces here so I had a go at it.
Parts List:
1 - 17.75-inch ×5-inch ×5-inch (round top) Funnel
2 - Large hose clamp, 2.5-inch ×5.5-inch
3 - Small hose clamp, 13/16-inch ×1.5-inch
4 - Da-Lite High contrast rear projection screen
5 - Black electrical tape
6 - Small Hacksaw
7 - Sand paper ( med - corse grit ) which I did not have
STRIKE 1.....What I noticed was after I cut the funnel half of it was fatter on the inside than the other. This was not good! A nice piece of sandpaper would have been helpful here but I chose not to use it as this is a test run.
STRIKE 2.....The Da-Lite material I had in my garage had a bunch of rustlike spots embedded in it. This will not work as it will not provide a clear image to the viewer. I will order some fresh material from Da-Lite for the next run
STRIKE 3.....The hose clamps I had were about 1/2" to big so I had to compensate by making the tube under it a bit fatter with tape!
3 Strikes and your out right? Nah.... Test run so I forged ahead.
Here's a few pics for your amusement ;D
Unfortunately the sun is hidden behind the rain this afternoon so the test will need to wait. Although the build quality is not the best I have a good feeling about it. I think I'll be able to work the bugs out of it and have a decent product after my new da-lite material is delivered.
The scope being used is a 60mm sears refractor with a FL of 900mm. The has a 20mm El Cheapo Huygens EP in place with any color filter. I do have an Orange filter on the way so the next iteration with have that installed.
This setup should give a sun about 3 - 3 1/2 inches in diameter to view.
Parts List:
1 - 17.75-inch ×5-inch ×5-inch (round top) Funnel
2 - Large hose clamp, 2.5-inch ×5.5-inch
3 - Small hose clamp, 13/16-inch ×1.5-inch
4 - Da-Lite High contrast rear projection screen
5 - Black electrical tape
6 - Small Hacksaw
7 - Sand paper ( med - corse grit ) which I did not have
STRIKE 1.....What I noticed was after I cut the funnel half of it was fatter on the inside than the other. This was not good! A nice piece of sandpaper would have been helpful here but I chose not to use it as this is a test run.
STRIKE 2.....The Da-Lite material I had in my garage had a bunch of rustlike spots embedded in it. This will not work as it will not provide a clear image to the viewer. I will order some fresh material from Da-Lite for the next run
STRIKE 3.....The hose clamps I had were about 1/2" to big so I had to compensate by making the tube under it a bit fatter with tape!
3 Strikes and your out right? Nah.... Test run so I forged ahead.
Here's a few pics for your amusement ;D
Unfortunately the sun is hidden behind the rain this afternoon so the test will need to wait. Although the build quality is not the best I have a good feeling about it. I think I'll be able to work the bugs out of it and have a decent product after my new da-lite material is delivered.
The scope being used is a 60mm sears refractor with a FL of 900mm. The has a 20mm El Cheapo Huygens EP in place with any color filter. I do have an Orange filter on the way so the next iteration with have that installed.
This setup should give a sun about 3 - 3 1/2 inches in diameter to view.
