Graham Fletcher Posted April 14, 2021 Share Posted April 14, 2021 Hi guys ,I have a Skywatcher 250px flex tube Dob and I have an Astrozap light shroud on it. I am considering getting a primary mirror cooling fan for the scope. Does anyone know much about these fans and would I get the benefit on my flex tube Dob? Can anyone suggest where I can get one that would attach to the hole pattern on the end of my Dob? thanks Graham Link to comment Share on other sites More sharing options...
tuckstar Posted April 14, 2021 Share Posted April 14, 2021 (edited) Heres the guide from when I did mine. Solid tube, but may help. http://www.eastmidlandsstargazers.org.uk/topic/9817-cooling-fan-mod/ The fan i used has now been discontinued but any low vibration fan should do the trick. Edited April 14, 2021 by tuckstar Link to comment Share on other sites More sharing options...
Bottletopburly Posted April 14, 2021 Share Posted April 14, 2021 This is the only commercial one I have seen graham , I just made my own https://www.teleskop-express.de/shop/product_info.php/info/p12082_Asterion-Primary-Mirror-Fan-for-Skywatcher-10--Newtonians-and-Dobsonians.html Link to comment Share on other sites More sharing options...
+RonC Posted April 14, 2021 Share Posted April 14, 2021 (edited) This is my home made version using a silent PC fan and controller. This is on my 150 PDS scope. Edited April 14, 2021 by RonC added text Link to comment Share on other sites More sharing options...
Graham Fletcher Posted April 14, 2021 Author Share Posted April 14, 2021 Excuse the (double entendre) but do you guys suck or blow? Link to comment Share on other sites More sharing options...
+RonC Posted April 14, 2021 Share Posted April 14, 2021 Blow Graham.. Link to comment Share on other sites More sharing options...
tuckstar Posted April 14, 2021 Share Posted April 14, 2021 Mine blows!!! 🤫As many people will tell you one way as another. For me I think drawing air on to the back of the primary will cool it quicker and blow currents out of the ota, and also keeps dew at bay. Some say it will pull dust through the scope, but its never been a problem for me. +RonC 1 Link to comment Share on other sites More sharing options...
Bottletopburly Posted April 14, 2021 Share Posted April 14, 2021 commercial one sucks Link to comment Share on other sites More sharing options...
Graham Fletcher Posted April 15, 2021 Author Share Posted April 15, 2021 Has anyone got any recommendations as to which fan would be suitable and a possible lead to a supplier please? It sounds the way to go rather than pay an extortionate amount for a dedicated one. Link to comment Share on other sites More sharing options...
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