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Old Dec 28, 2012, 09:47 PM
Landin' On The Canopy BAD
F-86FLIER4LIFE's Avatar
Lee's Summit, MO
Joined Jan 2008
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Quote:
Originally Posted by bamaguy View Post
Yes, 3S only....,I recall that Ming addressed that question a while back

A pair of these will do nicely on 4S..... http://www.hobbypartz.com/75m91-duct...ProductReviews
seems like that would result in a short flight time though
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Old Dec 28, 2012, 09:49 PM
Don't Move I've Dropped My Nut
bamaguy's Avatar
United States, AL, Huntsville
Joined Feb 2009
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Quote:
Originally Posted by Doug W View Post
OK, stupid question, as I am an aerodynamicist, not an EDF guy...can I just put bigger (higher amp) ESCs such as 60Amps and run the 777 on 4S? Or will the stock motors not handle it? I want more power but I don't want to blow $300 on more power for a daily flyer.
Doug, It will be quite a challenge to fit a 4S in that small compartment. My GensAce 3S3800 required some hogging of foam to move it fore about 1.5 inches past the front of the battery bay cutout.
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Old Dec 28, 2012, 09:59 PM
Landin' On The Canopy BAD
F-86FLIER4LIFE's Avatar
Lee's Summit, MO
Joined Jan 2008
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alright, so i think I have put together a full replacement system in case the motors end up not fitting the fans that I want to get. I'll be getting these motors http://www.hobbypartz.com/75m93-ducted-2210-3800.html with http://www.hobbyking.com/hobbyking/s...inch_64mm.html these fans and a couple 40 amp ESCs to run on 3S.
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Old Dec 28, 2012, 09:59 PM
Don't Move I've Dropped My Nut
bamaguy's Avatar
United States, AL, Huntsville
Joined Feb 2009
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Quote:
Originally Posted by F-86FLIER4LIFE View Post
seems like that would result in a short flight time though
About 2.75 minutes at WOT with a 25C/3800/4S (IF you can fit the battery! )
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Old Dec 28, 2012, 10:14 PM
Landin' On The Canopy BAD
F-86FLIER4LIFE's Avatar
Lee's Summit, MO
Joined Jan 2008
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Quote:
Originally Posted by bamaguy View Post
I'm sure they will fit, but we don't know their kv.....I've sent an e-mail to Ming about that and about programming info on those 30amp ESC's.

If the kv is 4200 to 4400, they should be fine. It will take a few more amps to turn that 7 blade rotor than the stock rotor, most likely.
Ming said the Kv on the motors is 3800, is that to low?
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Old Dec 28, 2012, 10:32 PM
Don't Move I've Dropped My Nut
bamaguy's Avatar
United States, AL, Huntsville
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Quote:
Originally Posted by F-86FLIER4LIFE View Post
Ming said the Kv on the motors is 3800, is that to low?
Probably, you should read the comments and discussion about the fan that users have posted on the unit....with different motors and cells. Go back and click the HK link you posted earlier. There is better info there than I can provide.
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Old Dec 28, 2012, 10:37 PM
Landin' On The Canopy BAD
F-86FLIER4LIFE's Avatar
Lee's Summit, MO
Joined Jan 2008
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Yeah I looked at it. I think I've landed on this little combo, looks like I should be able to hook it right up to the 30 amp ESC's just fine http://www.hobbypartz.com/88e-adf64-300l-kv4300.html
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Old Dec 28, 2012, 10:42 PM
Don't Move I've Dropped My Nut
bamaguy's Avatar
United States, AL, Huntsville
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Quote:
Originally Posted by F-86FLIER4LIFE View Post
Yeah I looked at it. I think I've landed on this little combo, looks like I should be able to hook it right up to the 30 amp ESC's just fine http://www.hobbypartz.com/88e-adf64-300l-kv4300.html

Kool! Let us know how it works out
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Old Dec 29, 2012, 03:22 AM
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limodune's Avatar
Australia, QLD, Toowoomba
Joined Oct 2011
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This is the information I have regarding motor size 4200kv ???

Mike
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Last edited by limodune; Dec 29, 2012 at 04:11 AM.
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Old Dec 29, 2012, 05:51 AM
Ming's Avatar
Hong Kong
Joined Jun 2002
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Sorry, that should be 4200kv, I mixup to another 737 motor.

Ming Lou
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Old Dec 29, 2012, 01:45 PM
Don't Move I've Dropped My Nut
bamaguy's Avatar
United States, AL, Huntsville
Joined Feb 2009
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3C3800 GensAce Does Fit!

Ran up the stock equipment again today....each motor draws about 28 amps/305 watts at WOT. Simulated a flight working throttle for taxi/WOT for take off and varying between 2/3 and half power for about 4 minutes. "landed" when battery cell voltages reached about 3.5 volts. ESC's got very warm, bordering on HOT. May replace them with 40 amp Dynam/Detrum units. later. Too darn cold and windy here for a maiden!!

UpDate: Replaced 3200mAh, used 84% of Battery...oooops!

As you know, most all size of battery have to be moved forward to achieve new CG of 200mm. For the GensAce 3800, I only had to dig out about 1.25 inches of foam at the front of the compartment. Width was fine, as is. Also added small plywood piece for other end of battery and the velcro hold down strap. All glued in place with Gorilla Glue (the newer, faster dry-clear, but dries white type) Balances perfectly at 200mm.
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Last edited by bamaguy; Dec 29, 2012 at 11:14 PM. Reason: Added Battery Bay Mod Info/Photos
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Old Dec 29, 2012, 05:06 PM
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Hawaiian Flyin's Avatar
Maui, Hawaii
Joined Dec 2007
329 Posts
Went to the field today and got a few flights in. First two went real nice. Nice flight nice landings. Third flight disaster struck. Upon landing I did a bounce and when it came back down the wings weren't level. Left engine hit the runway and shattered the foam nacelle and destroyed the impeller and cracked the housing. So will need to replace those.
Ming; Can these parts be ordered? Some glue will fix the foam pieces but if I can get a new one would rather do that. The fan and shroud are beyond repair. At least my decal survived!
Hawaiian
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Last edited by Hawaiian Flyin; Dec 29, 2012 at 09:37 PM.
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Old Dec 29, 2012, 09:49 PM
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Hong Kong
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Hawaiian

Please email me, I have few spare EDF able to ship.

Ming Lou
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Old Dec 30, 2012, 07:29 PM
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limodune's Avatar
Australia, QLD, Toowoomba
Joined Oct 2011
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Looks like it is not a good week for the B777

I have damaged my airliner on a second attempted take of, was in the air for a second or two like previous but came down, it has suffered a damaged nacelle and broken plastic and cracked the fuselage a couple of inches back from the wing and now it's a little out of shape and the front strut lean's back about 30* and is lose in the foam
This happened xmas morning, not a good start to the day

Mike
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Old Dec 30, 2012, 08:39 PM
Don't Move I've Dropped My Nut
bamaguy's Avatar
United States, AL, Huntsville
Joined Feb 2009
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Quote:
Originally Posted by limodune View Post
Looks like it is not a good week for the B777
Mike
Ouch! Sorry to hear, Mike

Good thing that I decided not to maiden my 777 today. About 38*...a bit nippy for old thumbs on a new airplane. So, I flew my Great Planes Cherokee, which I'd converted to E-Power and my Dynam Pitts12, instead.
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