Bill Dunlap Posted March 17, 2023 Posted March 17, 2023 I ran across this picture of a very cool fan while just cruising the internet. Anyone seen this one before? Looks to me like contra-rotating blades. Dang, I'd like to have one like this. Cheers, Bill 3 Quote
Louis Luu Posted March 18, 2023 Posted March 18, 2023 Bill, this is a concept fan and has not been made into one yet. You can download the schematics for a small fee and turn it into a working fan with you talents. https://www.turbosquid.com/3d-models/propeller-fan-pro-3d-model-1597668 Quote
Bill Dunlap Posted March 18, 2023 Author Posted March 18, 2023 That is a total meat slicer. I'd have to design a guard for it, definitely. 1 1 Quote
Louis Luu Posted March 18, 2023 Posted March 18, 2023 Here is a cheaper download: https://3dexport.com/3dmodel-fan-propeller-429910.htm Quote
Bill Dunlap Posted March 18, 2023 Author Posted March 18, 2023 (edited) Thanks. Went down the bunny burrow on blade design. I came up with this video. Of course, I thought about the application of this design on fans. I'm not good enough to fab up one of these. This would be a job for 3D printing. Cheers, Bill Edited March 18, 2023 by Bill Dunlap Quote
Louis Luu Posted March 18, 2023 Posted March 18, 2023 17 minutes ago, Bill Dunlap said: Thanks. Went down the bunny burrow on blade design. I came up with this video. Of course, I thought about the application of this design on fans. I'm not good enough to fab up one of these. This would be a job for 3D printing. Cheers, Bill I thought about this particular design as well. It is a new design with supposed whisper quiet and efficient design that was originally tested as a water propeller. Someone took the idea and used it on a drone. It would be interesting to have one printed in aluminum as a fan blade. Quote
Bill Dunlap Posted March 18, 2023 Author Posted March 18, 2023 I'll take two of those for a contra-rotating two blade fan. I know, keep dreaming.... Cheers, Bill If you're interested in tiny fans, these would work and a very low price, too. 3-4 inches. 8 for 20$ 1 Quote
David Kilnapp Posted March 18, 2023 Posted March 18, 2023 This is fascinating stuff! Thank you to the contributors! Quote
Louis Luu Posted March 18, 2023 Posted March 18, 2023 How would a motor spin two blades in opposite directions? The angle of the blade can be fix to blow forward by having one spin counter clockwise and the other one clockwise. But how would you make them spin and blow air in the same direction forward? Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common axis... Quote
Louis Luu Posted March 18, 2023 Posted March 18, 2023 Looks complicated and involving planetary gear setup. Quote
Louis Luu Posted March 18, 2023 Posted March 18, 2023 (edited) I would add two more bevel gears...one on the side of that green shaft and another one at 90 degree mounted to the motor so the motor would sit in the back. Looks fun and I have this Tailfun fan. The propeller would look nice in the housing. Bypass the green shaft that comes out the side. Extend have the shaft motor drive the purple bevel gear. This would be an easier design. Edited March 18, 2023 by Louis Luu Quote
Russ Huber Posted March 18, 2023 Posted March 18, 2023 (edited) Huges XF-11. Edited March 18, 2023 by Russ Huber Quote
Russ Huber Posted March 18, 2023 Posted March 18, 2023 19 hours ago, Bill Dunlap said: I ran across this picture of a very cool fan while just cruising the internet. Anyone seen this one before? Looks to me like contra-rotating blades. Dang, I'd like to have one like this. Cheers, Bill Amazon.com: CRM2413A Brushless Metal Motor Contra-Rotating Motor CRM2413 1300KV for Airplane Models w/Prop Adapter Two propellers Work with Two ESC Bring Strong Power Supply,w/Large Thrust for RC Flying Models : Toys & Games Quote
Louis Luu Posted March 18, 2023 Posted March 18, 2023 2 minutes ago, Russ Huber said: Amazon.com: CRM2413A Brushless Metal Motor Contra-Rotating Motor CRM2413 1300KV for Airplane Models w/Prop Adapter Two propellers Work with Two ESC Bring Strong Power Supply,w/Large Thrust for RC Flying Models : Toys & Games Not a bad price! Quote
Bill Dunlap Posted March 18, 2023 Author Posted March 18, 2023 (edited) The problem with regards to contra-rotating blades is the extreme level of noise. However, if you couple this mechanism to two toroidal blades, that just may subdue the noise to an acceptable level. I feel an invention coming on that may need an intervention. Cheers, Bill PS. I think I have three bevel gears in my stash.....oh, no. Edited March 18, 2023 by Bill Dunlap 1 Quote
Russ Huber Posted March 19, 2023 Posted March 19, 2023 https://campaign.aliexpress.com/wow/gcp/tesla-pc-new/index?UTABTest=aliabtest377151_530968&_randl_currency=USD&_randl_shipto=US&src=google&src=google&albch=shopping&acnt=708-803-3821&slnk=&plac=&mtctp=&albbt=Google_7_shopping&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&albcp=19108282527&albag=&trgt=&crea=en2251832236395350&netw=x&device=c&albpg=&albpd=en2251832236395350&gclid=Cj0KCQjwwtWgBhDhARIsAEMcxeDbW3bd0ju3Zv7EmS3lNquxgaE-EdUUFpGhTzy5PJlgZEDt3af8a0IaAir8EALw_wcB&gclsrc=aw.ds&aff_fcid=e74433d516f3429d8110d77cc359fa9a-1679196564840-04487-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=aaf&sk=UneMJZVf&aff_trace_key=e74433d516f3429d8110d77cc359fa9a-1679196564840-04487-UneMJZVf&terminal_id=e8ba1f4380804890afc2cd292739b49f&wh_weex=true&wx_navbar_hidden=true&wx_navbar_transparent=true&ignoreNavigationBar=true&wx_statusbar_hidden=true&bt_src=ppc_direct_lp&scenario=pcBridgePPC&productId=2251832236395350&OLP=1085100208_f_group2&o_s_id=1085100208 Quote
Bobby Gaines Posted March 19, 2023 Posted March 19, 2023 19 hours ago, Bill Dunlap said: The problem with regards to contra-rotating blades is the extreme level of noise. However, if you couple this mechanism to two toroidal blades, that just may subdue the noise to an acceptable level. I feel an invention coming on that may need an intervention. Cheers, Bill PS. I think I have three bevel gears in my stash.....oh, no. Bill I can't wait to see what you come up with!! Quote
Russ Huber Posted March 19, 2023 Posted March 19, 2023 1 hour ago, Bobby Gaines said: Bill I can't wait to see what you come up with!! Hey Bobby, why not order one of those mighty mouse DC contra-rotating motors and give Bill some competition? If you do, I bet there will be some bright brass involved. 🙂 Quote
Bill Dunlap Posted March 19, 2023 Author Posted March 19, 2023 The problem with those motors from Aliexpress is that the slowest one spins at over 6k rpm. eek. I'm not having something that spins that fast in my house. Now, if they are permanent magnet, brushed DC motors, they may respond well to a resistance coil for speed control. So, maybe... If someone could print up a couple of toroidal blades in brass around 8 inches, I'd be all in. I need one in CW and one in CCW. Cheers, Bill Quote
Louis Luu Posted March 19, 2023 Posted March 19, 2023 31 minutes ago, Bill Dunlap said: The problem with those motors from Aliexpress is that the slowest one spins at over 6k rpm. eek. I'm not having something that spins that fast in my house. Now, if they are permanent magnet, brushed DC motors, they may respond well to a resistance coil for speed control. So, maybe... If someone could print up a couple of toroidal blades in brass around 8 inches, I'd be all in. I need one in CW and one in CCW. Cheers, Bill Will call you later....working on a present for Ben Guegain's daughter "Emersyn". Quote
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