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Project: GWS A-10 Warthog EDF Brushless

Old 02-14-2007, 11:34 PM
  #26  
cyclops2
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Thanks for the weigh out of the plane seperate and then all else. I am going over to the GWS site to see what I can come up with. I was suprised to see the inrunner and the brush are very close on efficiencyon EDF75 sizes.

Will dig into the babies now for efficiency.
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Old 02-15-2007, 05:47 PM
  #27  
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Getting ready to start mine. LittleScreamers JetScreamers, XF fan units. Will definately reinforce the engine pods with CF, might do the elevator out of balsa.
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Old 02-15-2007, 06:44 PM
  #28  
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Hi, bowtie hi.

I just ordered the EDF/50 H fans. Have plenty of ESC's.
What kind of battery weight is ok with the 50's before things get sluggish ?
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Old 02-15-2007, 08:16 PM
  #29  
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Cyclops The reason I'm using the smaller fans is cause I had a pair of 12MM feigao brushless motors. I have an assortment of batteries & I'm starting with the 800mah but I might have to use bigger heavier batteries to get flight time. Bottom line I don't know. Did your plane come with EDF 50's or EDF 55's. If I had to use brush type motors I would use the EDF 55's. My brushless EDF 50's Have more thrust than the brush type EDF 55's. If you have an old kit it might have the EDF 50 nacelles. You can get new EDF 55 nacelles for less than $12.00 + shipping from BPHobbies. Hope I helped you.

Ken
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Old 02-15-2007, 11:58 PM
  #30  
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I picked the Slope glider and the 50's by reading the GWS fan charts.
Will larger fans fit into the pod ?

The 3 blade 50 H had the most eff. So I figure save the extra battery power needed. I can always cut away some of the motors plastic tube that traps the heat.
I can just mount a innrunner with a blade that fills the tunnel. Cut the pod in 1/2. Cut a thin piece of Aluminum to run from 1 pod , into the fuselage, and up to the other pod. Thin Aluminun strap over each motor. Done.
If thrust is low on the fishscale, In go the thin Aluminum straightners.

The pods have a entrance that has a fairly nice shape. I will move the fan around to peak the thrust.

I love tuning for peaks.
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Old 02-16-2007, 12:17 AM
  #31  
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There's many great mods for the A-10 in RCGroups. You just bought a new A-10 ? Most of the suppliers are out of the 50 MM nacelle slope models and all you can get is 55 mm nacelles. JUST build it light and it will be fine. Everybody that has built them say to stay lite. I'm going to run a piece of CF tube between the nacelles and use CF instead of wood. No chopsticks in my plane. Hehe

Ken

OH I forgot. If your motors are not installed in the fans you can break them in in a glass of water and they are (more better) Sounds crazy don't it ? Breaking in a brush type motor in in water keeps the commentator clean and smooth and they say the brushes last longer.
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Old 02-16-2007, 12:55 AM
  #32  
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I have spare armatures for different sizes that I CA'd fine sandpaper to the commutator section. It grinds down in 30 seconds with a cordless drill spinning it.

May have to do your water grind on the 12 MM motor.

I am going to get oversized pods? Or just the I. D. is bigger ?
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Old 02-16-2007, 01:55 AM
  #33  
Robbie d
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The larger fans will fit, but a light sanding will improve the fit. Stock they fly well on the edf-50 fans with 2 cells if kept light. The second one I acquired is being converted to a HE-219.
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Old 02-16-2007, 02:16 AM
  #34  
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Cyclops
BPHobbies has grey nacelles # GW/A10-FAS7-1/G8 for $10.76 There for EDF 55 fans.

Ken
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Old 02-16-2007, 02:33 AM
  #35  
Dr Kiwi
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Originally Posted by Cyclops View Post
I have spare armatures for different sizes that I CA'd fine sandpaper to the commutator section. It grinds down in 30 seconds with a cordless drill spinning it.

May have to do your water grind on the 12 MM motor.

I am going to get oversized pods? Or just the I. D. is bigger ?
If those are brushless motors DON"T get them wet! I may be confused (I know bowtie mentioned 12mm Feigao's) but better safe than sorry.
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Old 02-16-2007, 03:23 AM
  #36  
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Doc
I was referring to his 12mm brush type. Water breaks in a brush motor great. I did a speed 400 with 2 C cells and the water turned grey. Hooked it up & dropped it in till the batteries ran down. Happy New Year

Ken
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Old 02-16-2007, 01:47 PM
  #37  
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Doc.
The 50's stock motor is a 12 MM IPS motor. I will give it a bath to break it in. Then into a turned off oven that stabilized at 200 degrees F for 2 hrs to dry it out. Then a lube job at each end before running.

I have found that long,skinney motors usually have the most efficiency.
Especially where frontal area will be critical. EDF's.

For me, GWS is my favorite choice, as I only do sport flying.

Unless everybody is passing me.
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Old 02-16-2007, 01:49 PM
  #38  
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Thumbs up Build light and carry a large trash bag.

Cyclops Quotation.

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Old 02-16-2007, 02:54 PM
  #39  
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There you go.
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Old 02-16-2007, 05:52 PM
  #40  
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Should I also tack onto my present order a pair of 55 fan blades to fill the bigger pod hole?

What about a GWS inrunner/ KV ?
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Old 02-16-2007, 06:58 PM
  #41  
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Talking holes in the nacelles

Anyone have any thoughts that they will share on 3 blades vs 6 blades when running brushless inrunners w/4100kv, I've been trying to decide which one to use and have read that some guys get more thrust with 3 blades, but the newer A-10 kits come with 6 blade with brushed motors . I'm in the process of glassing the bottom main wing and will be moving on to the glassing the foam nacelles and i've made a little hole in each one , then I lined them up the hole in the plastic nacelles this allow me to remove the fan screws even after there installed inside the foam nacelles .
My P-38 is almost ready to maiden. Just ned a trip to LHS for some spinners and props. Weather is awesome right now and I'm leaving work tgo fly .
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Old 02-16-2007, 08:01 PM
  #42  
cyclops2
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Red face How many blades ?

1 blade has always been the most efficient.
2 is next and so forth.

With all parts of a plane the same. A 2 blade beats ALL others.

Less blades is more.

Last edited by cyclops2; 02-16-2007 at 08:02 PM. Reason: Medicine is kicking in!!
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Old 02-16-2007, 09:32 PM
  #43  
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Crash9 6 blades with brush type 3 blade brushless is about the standard.

Ken

BTW GWS will be bringing out 3 blade props for your 38. Read in RCGroups
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Old 02-17-2007, 07:45 PM
  #44  
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Default 3 for me

Originally Posted by bowtie hi View Post
Crash9 6 blades with brush type 3 blade brushless is about the standard.

Ken

BTW GWS will be bringing out 3 blade props for your 38. Read in RCGroups
Thanks Ken, I'm going with the 3 blades .
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Old 02-19-2007, 02:21 AM
  #45  
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got my motors setup, and tested
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Old 02-19-2007, 04:43 AM
  #46  
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Originally Posted by paranoia View Post
got my motors setup, and tested
Cool, How are those AC-DIYMOT-VL working for you. Keep us posted on your progress.
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Old 02-19-2007, 11:12 AM
  #47  
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There has been alot of conjecture about removing blades from the GWS fans and the experts say dont! They may test well on the bench but in the air they dont work the same. Just ask AirX and others on rcgroups who have done the tests.

The GWS EDF55 is as efficient as any other 55mm fan, again the experts have run comparisons and charts and most EDF units regardless of price are within a few % of each other.

The GWS inrunner motors are some of the most efficient around, I get an easy 30,000rpm with 3 cells on either the EDF55 or EDF64 at 11 amps using the GWBLM005 series motors. Last night I built a 4 cell EDF64 with a motor from the most recent batch I have and my figures are 38,000rpm at 16.5 amps and 14.5 volts! find a motor that can beat that in the EDF64 and I will use it!

I have also run the AC outrunners in all these fans, got one in my ALFA fan running at 56,000rpm on 4s1700 20c pack, 29 amps draw, 400 watts.

Run a different wind in the EDF55, very easy load on this one, 12 amps at 11 volts for 29,500rpm which is about 325g thrust, two of these in a glassed A10 and a 3s1700 20c battery and I am at 630g AUW and 650g thrust. Flies real nice with heaps of power and ROG with no wheels
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Old 02-19-2007, 12:37 PM
  #48  
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ExtremeRC
I was referring to the stock 3 blade EDF 50 rotor with the Feigao 5800 motor. How is your lightweight A-10 coming along ? What is the difference in weight on elevator using balsa or foam ? I like your hidden horn you did on yours.
You got any other great ideas you want to share on a lightweight build ? I need to build mine as light as I can with the little 28 turn feigao's. If it don't work I'm thinking Wemotec micro's with the 55 gram $14.95 cheap inrunners. Im working with a very slim budget. You keep up the good work ! I have enjoyed reading your
threads.

Ken in Tenn.
Inrunners from United Hobbies 6600KV
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Old 02-19-2007, 06:02 PM
  #49  
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Default Glassed is lighter then Balsa

Thanks for the info X, I ordered a couple of spare blades and will try both out. I was reading some of your posting at rcgroups .
Ken I weighed a balsa elevator vs a 3/4oz glassed one, and the glassed one was a few grams lighter then balsa. I going to go with glassed ones to save weight .
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Old 02-19-2007, 06:46 PM
  #50  
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Crash9
Thanks for the info. I think I'll just glass the hinge section of the control surface on the ailerons and elevator
just enough to stiffen them up a bit. I'm still debating on the CF down the center of fuselage but it wouldn't weigh much. I guess I got to reread ExtremeRC's build thread.

Ken
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