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All Forums >> Electric Aircraft Universe >> Foamies! - RC Electric Foam Aircraft >> RE: Let's start a GWS line.
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RE: Let's start a GWS line. - 1/25/2008 11:12:49 PM   
usmc_VTOL_mech


 

Posts: 23
Joined: 6/10/2007
From: West Hills , CA, USA
Status: offline 		AJ1202
Fiberglassing and silkspanning take forever it seems
But the more you do the faster you get and the end result is def worth it

_____________________________

dude...foam isn't supposed to make that noise when it hits the ground!

(in reply to AJ1202)
       Post #: 26

RE: Let's start a GWS line. - 1/26/2008 9:49:29 AM   
angry elvis


 

Posts: 33
Joined: 8/10/2007
From: stuttgart, GERMANY
Status: offline 		hey guys,

im looking at picking up the zero and a corsaire bith slope versions. any suggestions on what motor best suites these planes? anyone tried a few different set-ups? just looking for general suggestions so i can order as many parts as i need at the same time. also GWS has some different mounting brackets, whats the way to go?
any info/suggestions would be a big help!

(in reply to usmc_VTOL_mech)
       Post #: 27

RE: Let's start a GWS line. - 1/26/2008 8:03:55 PM   
AJ1202


 

Posts: 4285
Joined: 9/1/2005
From: Savannah, GA, USA
Status: offline 		Elvis I have found that depending on what size prop you want to run anything from a 950 to 1750 KV outrunner work good in the GWS birds
I'm running a range of all in mine, the lower the KV the larger a prop you will use
this will be determined by whether you want all out speed or thrust out the yazoo
the lower KV will give you more thrust and the higher will give you more speed

example I'm running a 1000 KV on my formosa with a 10X3.8 prop I have tons of thrust and decent speed

on my slow stick I have a 1200 KV running a 9X4.7 prop again lots of thrust and decent speed

On my plane I'm building now I'm going to put a 1750 KV and use a 7X4 prop and it's going to scream but be a bit shy on thrust in comparison

I would suggest the higher KV for both the planes you mentioned as prop size WILL be a factor, they both sit kinda low to the ground and you don't want to be swinging a big prop close to the ground

Just my 2 cents worth

_____________________________

AJ
Well I flew it up there... now how am I supposed to get it down

(in reply to angry elvis)
       Post #: 28

RE: Let's start a GWS line. - 1/27/2008 2:30:59 AM   
usmc_VTOL_mech


 

Posts: 23
Joined: 6/10/2007
From: West Hills , CA, USA
Status: offline 		Angry elvis
You can always go with a geared inrunner and get awesome power and efficiency to boot
I am spinning an 11x 7 prop on my p-40 under 20 amps and can hover with no problems
Speeds are around 55 to 60 MPH
Of course you would run a much smaller prop which is better because you can spin it faster

_____________________________

dude...foam isn't supposed to make that noise when it hits the ground!

(in reply to AJ1202)
       Post #: 29

RE: Let's start a GWS line. - 1/29/2008 5:38:04 AM   
4 stroken ron



Posts: 1414
Joined: 12/6/2001
From: Grinnell , IA, USA
Status: offline
quote:

ORIGINAL: AJ1202

Elvis I have found that depending on what size prop you want to run anything from a 950 to 1750 KV outrunner work good in the GWS birds
I'm running a range of all in mine, the lower the KV the larger a prop you will use
this will be determined by whether you want all out speed or thrust out the yazoo
the lower KV will give you more thrust and the higher will give you more speed

example I'm running a 1000 KV on my formosa with a 10X3.8 prop I have tons of thrust and decent speed

on my slow stick I have a 1200 KV running a 9X4.7 prop again lots of thrust and decent speed

On my plane I'm building now I'm going to put a 1750 KV and use a 7X4 prop and it's going to scream but be a bit shy on thrust in comparison

I would suggest the higher KV for both the planes you mentioned as prop size WILL be a factor, they both sit kinda low to the ground and you don't want to be swinging a big prop close to the ground

Just my 2 cents worth



Isn't there a lot more to know about brushless motors than just kv #s? What size motors are you using? I have a Formosa and a Tiger Moth 400 coming and I don't have any brushed ESCs so I what to replace the motors in both airplanes. I have a couple 25 amp brushless ESCs around and plenty of 1000 mil, 1350mil, 2250 mil 2S and 3S Lipos on hand. I went to bphobbies and looked at their line of BP outrunners and their BP CD ROM outrunners and not sure what to order. I was looking at BP because I will not buy any high dollar "BLING" motors, and I am done messing around with United Hobbies and their total lack of customer service.
Any ideas?
Thanks
Ron


(in reply to AJ1202)
       Post #: 30

RE: Let's start a GWS line. - 1/29/2008 11:44:15 AM   
AJ1202


 

Posts: 4285
Joined: 9/1/2005
From: Savannah, GA, USA
Status: offline 		Hi Ron, yes there is more to the story, always is OK in the BP line up here's the down and dirty, the bp 09 motor is the lower KV at I think 1050, this would turn a 9 to 12 in prop and amps would range from 12 to 21 depending on the prop
the bp12 is around 1200 KV and works well with a 8 to 10 prop pulling around 15 to 22 amps again depending on your prop
the bp21 is a 1750 kv and works good with a 5 to 7 prop and will pull from 13 to 24 amps depending on your prop
Now with all these motors they will turn much slower with a 2S than a 3, so you can and would want to increase prop size when using the 2S
All the above estimates of amp draw is based on 3S batts

The formosa loves speed, and because it is a very nice floater as well throttle control is the answer to slow flights with it, I have found I like the BP 12 as it offers the best thrust and speed ratio for the money, I have run the BP 21 and the 09 on mine, the 09 requires too big a prop and the 21 is short on thrust for hard vertical climbs, I enlarged my batt bay in the formosa and run a 2000 ma batt in it, but it will fly fine with smaller batts, just watch and make sure your CG is right, it doesn't like being tailheavy and will be a handfull

the Moth I don't have but have had a bipe or 2 and the 09 is the key there as you want more thrust than speed

I run 18 amp ESC in all my small foamys so you should be good to go with your 25 amp ESC

I hope this helped

_____________________________

AJ
Well I flew it up there... now how am I supposed to get it down

(in reply to 4 stroken ron)
       Post #: 31

RE: Let's start a GWS line. - 1/29/2008 4:49:12 PM   
4 stroken ron



Posts: 1414
Joined: 12/6/2001
From: Grinnell , IA, USA
Status: offline 		Yes, Thanks AJ In the mean time I found some SUPPO motors. These motors where tested by Dr.Kiwi on the "other site".
The motors tested are branded as Grayson-Welgard, but they are the same that LightFlightRC sells under the "SUPPO" brand. I am getting the 2212-13 for the for the Formosa and the 2217-09 for the Tiger Moth 400. Both should work great, and I can get them shipped to my door for $40.40, can't beat that.
here is a link to the test.
http://www.rcgroups.com/forums/showthread.php?t=673626
Thanks again

(in reply to AJ1202)
       Post #: 32

RE: Let's start a GWS line. - 1/29/2008 9:48:04 PM   
AJ1202


 

Posts: 4285
Joined: 9/1/2005
From: Savannah, GA, USA
Status: offline 		Sounds good, best of luck with your new birds
The formosa is a great flyer but be carefull when you set it up, keep your rates low on the ailerons till ou get a good feel for it, it is fast to respond, I mean very fast

_____________________________

AJ
Well I flew it up there... now how am I supposed to get it down

(in reply to 4 stroken ron)
       Post #: 33

RE: Let's start a GWS line. - 1/31/2008 3:28:47 AM   
R/C FLYR


 

Posts: 145
Joined: 1/16/2005
From: Maplewood, MN, USA
Status: offline 		Hi here is my list of GWS planes so far... c-47, mustang, Islander, and i just put a 2816-1220 Himax outrunner in my corsair with a 9x6 apc prop ,15c 3-cell it should be NUTS, it wants to tear out of my hands, i am sure it will have unlimited vertical!!! and will be quite fast R/C FLYR

(in reply to AJ1202)
       Post #: 34

RE: Let's start a GWS line. - 1/31/2008 3:30:06 AM   
R/C FLYR


 

Posts: 145
Joined: 1/16/2005
From: Maplewood, MN, USA
Status: offline 		Hi here is my list of GWS planes so far... c-47, mustang, Islander, and i just put a 2816-1220 Himax outrunner in my corsair with a 9x6 apc prop ,15c 3-cell it should be NUTS, it wants to tear out of my hands, i am sure it will have unlimited vertical!!! and will be quite fast R/C FLYR

(in reply to AJ1202)
       Post #: 35

RE: Let's start a GWS line. - 1/31/2008 3:31:12 AM   
R/C FLYR


 

Posts: 145
Joined: 1/16/2005
From: Maplewood, MN, USA
Status: offline 		Hi here is my list of GWS planes so far... c-47, mustang, Islander, and i just put a 2816-1220 Himax outrunner in my corsair with a 9x6 apc prop ,15c 3-cell it should be NUTS, it wants to tear out of my hands, i am sure it will have unlimited vertical!!! and will be quite fast R/C FLYR

(in reply to AJ1202)
       Post #: 36

RE: Let's start a GWS line. - 1/31/2008 3:32:46 AM   
R/C FLYR


 

Posts: 145
Joined: 1/16/2005
From: Maplewood, MN, USA
Status: offline 		Hi here is my list of GWS planes so far... c-47, mustang, Islander, and i just put a 2816-1220 Himax outrunner in my corsair with a 9x6 apc prop ,15c 3-cell it should be NUTS, it wants to tear out of my hands, i am sure it will have unlimited vertical!!! and will be quite fast R/C FLYR

(in reply to AJ1202)
       Post #: 37

RE: Let's start a GWS line. - 2/9/2008 10:39:02 PM   
angry elvis


 

Posts: 33
Joined: 8/10/2007
From: stuttgart, GERMANY
Status: offline 		im still trying to wrap my head around this prop size volts amps thing.
ive got 5 NimH 7 cell packs (8.4V), i havnt bought into the Lipo batts yet as theyre expensive and i know one wont be enough.
SO, with the NimH packs, and using the 3 blade (2,20€each!) GWS props- (on the rcwarbirds site it says they are 9x7-might be a typo!)
what would be a suitable KV value to look for in a BL outrunner motor?
once i get a grip on this ill be able to figure it out...

(in reply to R/C FLYR)
       Post #: 38

RE: Let's start a GWS line. - 2/10/2008 4:33:08 AM   
Mr. Mugen