5 inch ducted fan

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  Can someone tell me how many rpm,s that a 5 inch 7 blade ducted fan will handle if well ballanced. I am purchassing 2 from Hobby King for my home built carbon fiber 4 Ft x 6.4 Ft F117 Nighthawk with added Kanards. I need to know for pully sizing for a 40 cc 2 stroke engine I will be mounting in it for power. This engine is rated at 6500 rpm,s.   Thanks all.

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Finetuned50s Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (US) USERID: 372968 Newbie Joined: 11/Dec/2009 Location: Fl Online Status: Offline Posts: 18	Quote Reply Topic: 5 inch ducted fan Posted: 11/Dec/2009 at 11:31am
	Can someone tell me how many rpm,s that a 5 inch 7 blade ducted fan will handle if well ballanced. I am purchassing 2 from Hobby King for my home built carbon fiber 4 Ft x 6.4 Ft F117 Nighthawk with added Kanards. I need to know for pully sizing for a 40 cc 2 stroke engine I will be mounting in it for power. This engine is rated at 6500 rpm,s. Thanks all.

Ken jack Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (AU) USERID: 142032 Bargain Addict! Joined: 26/Feb/2009 Location: BRISBANE AU Online Status: Offline Posts: 92	Quote Reply Posted: 13/Dec/2009 at 4:21am
	Hi,finetune.You will need to have a ratio of 5to1 or 6 to 1 to bring rpm up to around 30000 rpm .I would suggest you use toothed belt as there is no slip with them .The 5 inch fan will stand this rpm as i have run one to this speed. the fan needs to be balanced and outside dia. of fan trued up so all blades run true.Best of luck with your project and let us know how you make out.Regards Ken Jack

Finetuned50s Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (US) USERID: 372968 Newbie Joined: 11/Dec/2009 Location: Fl Online Status: Offline Posts: 18	Quote Reply Posted: 15/Dec/2009 at 1:56am
	Thank you so much this will help me in sellecting the toothed pully for my 40 cc engine. Thanks

jeff.burbank Members Profile Send Private Message Find Members Posts Add to Buddy List N/A (N/A) USERID: 0 Bargain Addict! Joined: 15/Nov/2009 Online Status: Offline Posts: 46	Quote Reply Posted: 22/Dec/2009 at 1:47pm
	lets see some pictures of this thing!

Ken jack Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (AU) USERID: 142032 Bargain Addict! Joined: 26/Feb/2009 Location: BRISBANE AU Online Status: Offline Posts: 92	Quote Reply Posted: 23/Dec/2009 at 3:46am
	Hi,I do not know what max rpm for HK 5 inch will handle ,and i would suggest you aim for about 25000 to 30000 rpm as i have run a modified fan with less blade area at 26000 which was dynamicly balanced with no problems,Regards Ken Jack.

Finetuned50s Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (US) USERID: 372968 Newbie Joined: 11/Dec/2009 Location: Fl Online Status: Offline Posts: 18	Quote Reply Posted: 28/Dec/2009 at 10:41pm
	I will put pics in here futher along into my project. Dont want to be laughed at just yet.