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motor for the GWS 55 mm rotor?

Old 12-11-2008, 07:11 PM
  #1  
cyclops2
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Default motor for the GWS 55 mm rotor?

The fan size is a 64 mm.
Does the BP Hobbies ...BP H2217- 4 turns..KV 3500..30 amps. for 18 seconds..3 lipos.. for helicopters up to 25 oz. Sound like a good motor for the GWS 64's ? The 64 rotor is 28 mm. So is the motor dia. I am making 4 motor mounting ring similar to the small one in the picture used on the A-10. They will allow me to position the fans in the GWS f-15 anywhere, to help with the COG balance.
I hate lead or huge batteries. The plane ready to fly will weigh 37 or 38 oz.
Battery will be a 4 cell A123 ( Dewalt ). 12 volts loaded down at launch time. They weigh 11 oz alone.
Thrust should be 24 oz. total.

I could use some yes & no about this idea.

Rich
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Last edited by cyclops2; 12-12-2008 at 02:00 AM. Reason: Feeble mind.
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Old 12-11-2008, 09:22 PM
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fred2510
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Perhaps.. Overkill, imo though. The motor tube diameter of a GWS fan 55 and 64mm is 24mm.
Single stator DIY cdrom type motors have been proven to generate upwards of 450 gr thust at 16 amps. Not too many suitable motors do as well.
Also it's Reallly tough to fit the 27.8 mm can of that motor 'in there' whithout a standoff assembly ala little screamers.

From experience I suggest you buy either this:

http://www.hobbycity.com/hobbycity/s...ssembled__188W

or if you prefer, the 64mm version on the same page. The important part is the ADH300 motor .. For the $$.. a good motor for the 64 & 55 fans consider the fan as Free.
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Old 12-11-2008, 10:36 PM
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Bill G
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Really have to ask yourself what you want out of the EDF55. So many good combinations. A 370 4100kv short can performs well, and can abused a bit on 4s if you want power. The Hyperion Y22 motors are good for the price, and are made for a perfect fit in the fan housing.

The Donsrc Wicked is very powerful in the EDF55, if that's what you want.
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Old 12-12-2008, 01:52 AM
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cyclops2
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Cool I need mental help.

The fans are GWS 64's.

Oh boy.

Hopefully that is all I have wrong.
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Old 12-12-2008, 02:11 AM
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Bill G
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Originally Posted by Cyclops View Post
The fans are GWS 64's.

Oh boy.

Hopefully that is all I have wrong.
Not that far off. Again, the Dons Wicked runs well in 2 EDF64 fans I have.

Another motor that ran good for me was the GWS cheap 3900kv. They can keep them now though. About sick of my LHS too. Today I tried to buy one, and it is about the 3rd TIME the entered new stock in the system at new HIGHER prices, and blew off marking up the old stock they had. They shouldn't mark up the old stock anyways, as they paid less for it. I bought one for $24, and got my receipt that said $40. Made them refund my money immediately. Not worth $40 bucks, that's for sure. I recently burned up one of their 4600kv motors in an overpropped setup, that was a very good fan motor. When I took it apart though, I noticed that the factory nicked a bunch of wires when they were packing the windings in the can. Sure enough, those are the wires that blew when it was run hard. While I probably ran it too hard when it blew, it wouldn't have, if it had been made properly.
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Old 12-12-2008, 03:04 AM
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cyclops2
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Hi Bill. Good to hear from you.
Hobbiests must be made of money in the USA. Depression is on and prices are going up ?
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Old 12-12-2008, 03:31 AM
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Bill G
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Originally Posted by Cyclops View Post
Hi Bill. Good to hear from you.
Hobbiests must be made of money in the USA. Depression is on and prices are going up ?
Yes, they are printing money as if they are playing Monopoly.
It has that effect. By the end of next year, your money will have the value of Monopoly money.
.....do not pass Go, do not collect $200.....
.....well heck, you may win $10 in a beauty contest
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Old 12-12-2008, 08:34 PM
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fred2510
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Lookit:
http://www.hobbycity.com/hobbycity/s...ssembled__252W

$23 + $3.50 postage
Ready to go it WILL fly well Yesss.. you can double the power (and Amp draw) by using different motors... $65 each from Don's :-)
But you will also need more/bigger batteries, a stronger Model, a large flying field and V good eyes.
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Old 12-13-2008, 01:05 AM
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Bill G
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Originally Posted by fred2510 View Post
Lookit:
http://www.hobbycity.com/hobbycity/s...ssembled__252W

$23 + $3.50 postage
Ready to go it WILL fly well Yesss.. you can double the power (and Amp draw) by using different motors... $65 each from Don's :-)
But you will also need more/bigger batteries, a stronger Model, a large flying field and V good eyes.
You know the only issue I have with them is that it's difficult to nail them down to exactly what you are getting, so that you can follow other's reviews on the forums. When they do stock a good motor and continue to get it from the same supplier, and advertise it consistently that way, there are deals. It is becoming more obvious that many of their motors are good motors sold by other vendors at much higher prices.
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Old 12-15-2008, 06:49 PM
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fred2510
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Yess that happens... but it has not happened to me in 2 years of ordering there.
However that linked item is a "combo' unit and I've had NO substitutions with it.
What is seen is what I recieved..twice.
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Old 12-15-2008, 07:20 PM
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Bill G
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Originally Posted by fred2510 View Post
Yess that happens... but it has not happened to me in 2 years of ordering there.
However that linked item is a "combo' unit and I've had NO substitutions with it.
What is seen is what I recieved..twice.
Don't take the comment the wrong way. I'm more interested than ever in investigating their stuff. I placed an order recently for $120, tested everything out and all good. I started looking at all the stuff I got, realizing that some of it was for future projects (stuff I always use) and thought maybe I got ahead of myself. Then I realized that it basically amounted to me getting 2/3 of the order for free, compared to buying at the LHS. Some of the items are the SAME brand that the LHS stocks from BP, at 3 times more.

2 days ago was the epitome of this. Bought a $24 GWS motor for an EDF64 fan, got my receipt, and realized that they had decided to mark them up to GWS's new price. That's nonsense They've done this crap before and I'm about done with it. Worse than anything HC is accused of doing. When you mark stuff up to the new invoice, then you GO AROUND THE STORE and re-mark the tags of existing stock, so people are not duped. The bottom like is that at more than $24, the lower quality GWS motor cannot compete with Hobby City. In that case, I'm ordering from HC.

Tying to this thread, the GWS long can 4600kv is a good motor for the EDF55, but not above $24. I killed my last one overpowering it, but it still should have held up. Looked inside and saw that they nicked windings when packing the endbells on, which caused the weak links which popped under high current. If so called name brands have these issues, then I'm going HC for less.

Rich are you mixing up fans again?
The pics appear to be the EDF50 fans. Just looked at them.
Interesting topic, as I've experimented with Feigaos on all these fans. My basic conclusion is that for the 40mm and under, you want the 5866kv. For the EDF50, the 4100kv is actually close in ouput to the higher kv versions, has the added torque to benefit from the 6 blade rotor, and is easier on the motor. The added thrust from the higher kv versions above this, comes at a disproportional cost in current required, abusing the motor also. If I were to build an A10, I'd probably try to keep it very light and use the 4100kv. I have them in a Cox Airlifter conversion which flys well/ROG on 10C 3s-1320 batts, but has a light wing load. The 5866kv twins require a batt at least as good as a TP 3s-1320 ProLite.

The blade count varies with kv verion also. On the EDF50, the 5866kv does not benefit from the higher blade count, and does best with the 3 blade, due to its higher rpm/lower torque characteristic. I tested the 7000kv on an EDF30 fan, and can draw the conclusion that it is not even worth the added power demand for a little extra thrust on this fan. Probably would run worse than the 5866kv in the EDF50. Along those lines, the EDF40 is almost identical in thrust to the EDF50, when using the 5866kv motor, from what I remember. These motors aren't torquey, which makes the 40mm rotor possibly a more ideal dia for them to spin than the 50mm.

Bottom line: a bunch of variable with these little fans.

Last edited by Bill G; 12-15-2008 at 07:37 PM.
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Old 12-15-2008, 08:12 PM
  #12  
cyclops2
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Thumbs up Staying with Hyperion.

The F-15 gets 2.. Y22s 3600 or 4200 KV. Not sure as the plane will be between 32 & 34 oz. maximum. Went with 8.. B & D VPX 1100mah cells because the package in the nose needs no cutting away of anything & ESC's can reach them with stock leads. 8 cells paralleled to make a 4 cell 2200 mahr pack.
Buy more than needed for future jobs?

I have 0.. HS-55's for the taileron.

Rich
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Old 12-17-2008, 05:45 AM
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Bill G
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Originally Posted by Cyclops View Post
The F-15 gets 2.. Y22s 3600 or 4200 KV. Not sure as the plane will be between 32 & 34 oz. maximum. Went with 8.. B & D VPX 1100mah cells because the package in the nose needs no cutting away of anything & ESC's can reach them with stock leads. 8 cells paralleled to make a 4 cell 2200 mahr pack.
Buy more than needed for future jobs?

I have 0.. HS-55's for the taileron.

Rich
Mine flys wel at 48oz. You should be fine at your weight. I ran standard elevator with GWS Naro servos, which works well. I avoided using a servo reverser by connecting the pushrods relatively close in on the servo horns, and still got the necessary throw without having to use the outermost holes on the elevator horns. This way I was still able to route both pushrods over top of the elevator. The rod coming from the servo where the horn is flipped down is lightly rubbing against the elevator top surface in order to route the rod over the elevator, but it's not a problem.
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Old 01-27-2009, 01:59 AM
  #14  
cyclops2
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Thumbs up Hi Bill.

I choked & did a pusher that weighs 22 oz. RTF.
2 VPX & a 3700 KV helimotor.
Tailerons.

Great hand glider off the 8' ladder.

Now for some feebees ? Have 6 sheets of flat 1/4" X 4" X 48" good Balsa. 15 years in original shipping box. Could you use it ? No charge.
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