Guest StevenWhatley Posted August 10, 2015 Share Posted August 10, 2015 Well adding a Fan and Shield to the bottom of my 250p to cool the mirror ended up making it look like a Thruster Rocket.. :D 250p Thruster Mod by Steven Whatley, on Flickr 250p Thruster Mod by Steven Whatley, on Flickr Link to comment Share on other sites More sharing options...
Smithysteve Posted August 10, 2015 Share Posted August 10, 2015 Nice one Steve. You just need a nose cone for the other end to get the neighbours even more worried!😊👠Link to comment Share on other sites More sharing options...
Tibbz2 Posted August 10, 2015 Share Posted August 10, 2015 Didn't notice you had a dob, very nice. (Then again I've been out of astro for a good few months ) Link to comment Share on other sites More sharing options...
Astronigel Posted August 10, 2015 Share Posted August 10, 2015 Yep a nose cone should be your next mod Oh, and maybe write "POLARIS" or something down the side... Altho you may get satellites photographing your back garden alot in high res.... 😊 Link to comment Share on other sites More sharing options...
Daz Type-R Posted August 10, 2015 Share Posted August 10, 2015 (edited) Ok, I'm proberbly been daft here but the back of your scope looks identical to mine. That silver looking piece is actually the back of the mirror cell, so are you only blowing air to the back centre of the cell? If so, how are you getting air around the cell to create a boundary layer of air over the face of the primary, which actually keeps dew off it and aids in cooling? My fan mod covers and seals the entire back panel of the scope, so the air has no where to go other than up the tube! For example, mine before..... Mine after...... Edited August 10, 2015 by Daz Type-R Link to comment Share on other sites More sharing options...
Guest StevenWhatley Posted August 10, 2015 Share Posted August 10, 2015 Ok, I'm proberbly been daft here but the back of your scope looks identical to mine. That silver looking piece is actually the back of the mirror cell, so are you only blowing air to the back centre of the cell? If so, how are you getting air around the cell to create a boundary layer of air over the face of the primary, which actually keeps dew off it and aids in cooling? My fan mod covers and seals the entire back panel of the scope, so the air has no where to go other than up the tube! For example, mine before..... Mine after...... You are quite right I still need to add in the plate to force the air up the tube.. sorry i should have mentioned that i was too busy giggling at the way it looked to focus on the way it actually worked Link to comment Share on other sites More sharing options...
Daz Type-R Posted August 10, 2015 Share Posted August 10, 2015 (edited) Ahh fair dos, didn't want you wasting time, effort and money on something that was never going to work. Just thought, how are you varying the speed or is it set perm to slow? Edited August 10, 2015 by Daz Type-R Link to comment Share on other sites More sharing options...
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