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Model Forum / Radio Controlled / Air Models / May 2008balancing DF impelors
balancing DF impellers will this decrease the current needed to drive them? I have brought one of the cheap Al's hobbies Hawks, but the fan vibrates like hell and at half throttle is pulling 60amps, and the motor even without the fan pulls 10amps with no load if I manage to balance it will the amps go down?  SignatureKevin R Reply address works Unlikely that you'll get the current draw below the no-load motor draw I'd have thought! As for balancing the impellor reducing the overall load I'm not sure. It does seem intuitive though. Whether or not you lower the load, you'll certainly be making the assembly more efficient thats for sure (but that might not mean less draw, just using whatever draw it does make more useful) D > balancing DF impellers will this decrease the current needed to drive > them? > I have brought one of the cheap Al's hobbies Hawks, but the fan vibrates > like hell and at half throttle is pulling 60amps, and the motor even > without the fan pulls 10amps with no load if I manage to balance it will > the amps go down? > Unlikely that you'll get the current draw below the no-load motor draw I'd > have thought! [quoted text clipped - 4 lines] > might not mean less draw, just using whatever draw it does make more useful) > D I was trying to gauge what ESC I might need SignatureKevin R Reply address works Yes it will reduce current draw, but not sure by how much. The excessive vibration will be putting a lot of drag on bearings so balancing will reduce this considerably. 60 amps sounds like a lot of current draw, but I assume this is static reading, in flight fan will unload and current draw will reduce considerably :) > balancing DF impellers will this decrease the current needed to drive > them? > I have brought one of the cheap Al's hobbies Hawks, but the fan vibrates > like hell and at half throttle is pulling 60amps, and the motor even > without the fan pulls 10amps with no load if I manage to balance it will > the amps go down? > Yes it will reduce current draw, but not sure by how much. > The excessive vibration will be putting a lot of drag on bearings so > balancing will reduce this considerably. > 60 amps sounds like a lot of current draw, but I assume this is static > reading, in flight fan will unload and current draw will reduce considerably > :) Fans don't unload much, if at all. A lot draw more in flight, actually, once the ram air effect gets working and the blades come out of stall. If you want a cheap fan that works, try Greenair designs. They actually *fly* them, rather than £30,000 jets... you did'n't say what size the fan is, but 10A idle sounds excessive.. >> balancing DF impellers will this decrease the current needed to drive >> them? >> I have brought one of the cheap Al's hobbies Hawks, but the fan vibrates >> like hell and at half throttle is pulling 60amps, and the motor even >> without the fan pulls 10amps with no load if I manage to balance it will >> the amps go down? >> Yes it will reduce current draw, but not sure by how much. >> The excessive vibration will be putting a lot of drag on bearings so [quoted text clipped - 11 lines] > > you did'n't say what size the fan is, but 10A idle sounds excessive.. 3.5 inch and the motor pulls 10 amps without the fan >>> balancing DF impellers will this decrease the current needed to drive >>> them? >>> I have brought one of the cheap Al's hobbies Hawks, but the fan >>> vibrates like hell and at half throttle is pulling 60amps, and the >>> motor even without the fan pulls 10amps with no load if I manage to >>> balance it will the amps go down? SignatureKevin R Reply address works |
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