SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Dec 25, 2007, 11:46 PM
Suspended Account
Bill Covert's Avatar
Grove City, PA
Joined Sep 2007
955 Posts
Quote:
Originally Posted by GWS4CEO
The new rotor improvement will come with ribs to hold the center hole not to be off-set during cooling out from mold.
Yes, I have a few GWS rotors where the fans are true, but the hub is not. I assumed it was due to uneven cooling. This also explains why some hold up better than others. I just ran one last night to 335W in an EDF64, with no problems. I've blown 55 rotors at 250W.
Also, interesting to note that when a GWS rotor explodes under high power, which I've done, I don't think the blades fail. I believe the hub fails. I've had ones with NOTHING left afterwards.
This improvement should make the rotors capable of higher power levels.
Bill Covert is offline Find More Posts by Bill Covert
Last edited by Bill Covert; Dec 30, 2007 at 12:03 AM.
Reply With Quote
Sign up now
to remove ads between posts
Old Dec 28, 2007, 09:44 AM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
The new rotors designed for high watts had done!

However, too many products cost so much money to run the initial production.
GWS4CEO is offline Find More Posts by GWS4CEO
Reply With Quote
Old Jan 05, 2008, 09:29 AM
Registered User
Sacramento
Joined May 2003
26 Posts
rotor balance

Quote:
Originally Posted by gws-rc-models.ch
....Just let it dry like that on a flat surface and balance next day with a few drill holes.
how do you go about balancing the rotor after filling the hub with epoxy/balloon mixture? i know you have to drill a few holes to balance it out, but how do you know where to drill the holes and when do you know the rotor is then balanced? thanks!
phishphen is offline Find More Posts by phishphen
Reply With Quote
Old Jan 05, 2008, 09:39 AM
gws-online-dealer
gws-rc-models.ch's Avatar
Winterthur, Switzerland
Joined Jan 2006
591 Posts
I use a magnetic balancer like the one on the attached pictures.

It is somwherer around USD 20.00 in your LHS
gws-rc-models.ch is offline Find More Posts by gws-rc-models.ch
Reply With Quote
Old Jan 05, 2008, 04:29 PM
Registered User
Sacramento
Joined May 2003
26 Posts
nice..thanks for the reply...im gonna consider doing this to my a10 edf55 build
phishphen is offline Find More Posts by phishphen
Reply With Quote
Old Jan 21, 2008, 04:47 PM
gws-online-dealer
gws-rc-models.ch's Avatar
Winterthur, Switzerland
Joined Jan 2006
591 Posts
You can also recycle your old EPS gears and use your turning lathe to drill out a 7.00mm hole and strip of the teeth down to 25.1mm (when used in a EDF55).

Then you get something like that:
gws-rc-models.ch is offline Find More Posts by gws-rc-models.ch
Reply With Quote
Old Jan 22, 2008, 08:32 AM
Registered User
wedge98's Avatar
East Hartford, CT
Joined Sep 2006
1,304 Posts
Quote:
Originally Posted by gws-rc-models.ch
You can also recycle your old EPS gears and use your turning lathe to drill out a 7.00mm hole and strip of the teeth down to 25.1mm (when used in a EDF55).

Then you get something like that:
Oh that looks PERFECT!!!!! Awesome job!!!!

I might consider just using GWS fans from now on if this works.
wedge98 is offline Find More Posts by wedge98
Reply With Quote
Old Jan 22, 2008, 10:54 AM
Suspended Account
Bill Covert's Avatar
Grove City, PA
Joined Sep 2007
955 Posts
Quote:
Originally Posted by GWS4CEO
When rotor center less off-set and weight lighten will make RPM higher, yet less current and vibration.

But the more accuracy demand, the production cost go higher!
For those who have been involved in plastic injection molding, there's a good point here.

GWS rotors are generally molded to acceptable tolerances for our uses. If you took a lot sample, you may find say 10% that could really be a bit better. Please don't argue the numbers here, as its all hypothetical.

Now if GWS wanted to have all 100% at tight tolerances, they would pay a much higher cost to have the manufacturer reject the few severely off-tolerance rotors, and for the most part, the rotors that would pass the QC and be shipped to GWS would not be much better if any, than the rotors GWS already gets from them.

I have literally seen this happen:
You spec no tolerance, but with modern maufacturing you get high tolerance parts (relating to your actual CAD file's dimensions) without paying any additional costs for high tolerance.
You spec tolerance, pay like hell for it, and end up with the same part tolerances that you would get in the first scenario, but just pay twice as much.

The real bottom line here is that the best option for us (customers) would be to simply buy a large lot of rotors, and personally reject the ones we feel are out of tolerance. In the end, the cost would be no more than if we paid for it up front.
Bill Covert is offline Find More Posts by Bill Covert
Reply With Quote
Old Jan 22, 2008, 09:41 PM
Suspended Account
Joined Sep 2007
401 Posts
Quote:
Originally Posted by gws-rc-models.ch
I use a magnetic balancer like the one on the attached pictures.

It is somwherer around USD 20.00 in your LHS
Yes, but the first thing to do with this kind of magnetic balancer is
you have to balance those two round plugs and then make sure
the shaft is straight. How do I know? I suffered about
it too much and never used it again


blueplane is offline Find More Posts by blueplane
Reply With Quote
Old Jan 23, 2008, 06:48 AM
gws-online-dealer
gws-rc-models.ch's Avatar
Winterthur, Switzerland
Joined Jan 2006
591 Posts
The hanging doesnt matter, but the shaft that was included wasent really straight enough. So I replaced it with a much shorter and hardened 3mm shaft from an outrunner. Just needed to "sharpen" the ends of the motor shaft.
gws-rc-models.ch is offline Find More Posts by gws-rc-models.ch
Reply With Quote
Old Jan 23, 2008, 04:12 PM
Suspended Account
Joined Sep 2007
401 Posts
Quote:
Originally Posted by gws-rc-models.ch
The hanging doesnt matter, but the shaft that was included wasent really straight enough. So I replaced it with a much shorter and hardened 3mm shaft from an outrunner. Just needed to "sharpen" the ends of the motor shaft.
nope, not the hanging but those two little round
plugs that hold the Rotor in the middle of the shaft for balancing.
Mine are horrible unbalanced and why would I bother and waste time
with these craps.



blueplane is offline Find More Posts by blueplane
Reply With Quote
Old Jan 24, 2008, 03:43 AM
gws-online-dealer
gws-rc-models.ch's Avatar
Winterthur, Switzerland
Joined Jan 2006
591 Posts
Ah, yes...

One can tell it from just putting them on a flat glass table; they roll on one side...
gws-rc-models.ch is offline Find More Posts by gws-rc-models.ch
Reply With Quote
Old Jan 24, 2008, 01:56 PM
Suspended Account
Joined Sep 2007
401 Posts
Quote:
Originally Posted by gws-rc-models.ch
Ah, yes...

One can tell it from just putting them on a flat glass table; they roll on one side...
He he he...
So the first thing to do with these balancers
is to balance them before you start to use them.

How Ironic!


blueplane is offline Find More Posts by blueplane
Reply With Quote
Old Jan 26, 2008, 02:45 PM
Suspended Account
Bill Covert's Avatar
Grove City, PA
Joined Sep 2007
955 Posts
I just used a GWS "B" gear to insert and CA glue in the rear of the rotor hub of an EDF64 rotor. This is a gear from the 300 series gearboxes. Given that only a few teeth were only slightly damaged, I can say that a new one should should fit right in perfectly.

I am also fully convinced that the hubs are what explode, and not the blades. This should really help dampen vibration and keep the hub together.
Quote:
Originally Posted by blueplane
He he he...
So the first thing to do with these balancers
is to balance them before you start to use them.
How Ironic!
C'mon, you haven't heard of "Balancer Balancers"?
Bill Covert is offline Find More Posts by Bill Covert
Reply With Quote
Old Feb 16, 2008, 02:17 PM
Always optimistic
foxflier's Avatar
North of Houston, TX
Joined Feb 2005
288 Posts
How do you balance the EDF64 rotor?

I'm getting ready to install the EDF64s in my -15 and would love to balance the rotors but I'm missing how to go about getting the rotors onto a balance shaft as the hole through the rotor is quite small? I must be suffering a lapse

Would someone mind offering a brief tutorial on how to balance these rotors?

TIA
foxflier is offline Find More Posts by foxflier
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Good Tuning Tips For Your BCP!!! speeddemon281 Micro Helis 2 Jan 13, 2006 07:55 PM
Discussion Here are some easy snow skis for your Slow Stick CactusJackSlade Beginner Training Area (Aircraft-Electric) 2 Dec 22, 2005 01:05 PM
Easy way of making parallel tail mounts for your CF tubes PLD Hand Launch 4 Feb 06, 2005 10:12 AM
Question How about this motor for your EDF ScienceGuy Electric Ducted Fan Jet Talk 9 Jun 27, 2004 02:52 PM
EDF for your AUTOMOBILE!?! scififlyer Electric Ducted Fan Jet Talk 13 Aug 02, 2003 10:15 PM