Espritmodel.com Telemetry Radio
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Old Aug 25, 2006, 05:32 AM
Ay up it's warped
mtbrider's Avatar
Derbyshire UK
Joined Feb 2003
1,304 Posts
When will the rest of the world get them?
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Old Aug 25, 2006, 08:54 AM
Ship first, Improve often
L0stS0ul's Avatar
Virginia
Joined Apr 2005
5,008 Posts
Got an email from Joyce. They are offering up the brushless with the unpainted version for the Early Birds yay. Just waiting on the final bill now.
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Old Aug 25, 2006, 09:24 AM
Who put that TREE there!!
Columbia, MO
Joined Dec 2005
622 Posts
I haven't heard anything yet...
Come on Joyce, I've been a good boy (sort of...)
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Old Aug 25, 2006, 09:32 AM
Fly it like you stole it..
Tram's Avatar
Florence, Al
Joined Oct 2000
29,298 Posts
Hmm.. Brushless and the bird... I used to be on the earlybird list.. I haven't gotten an email.. I wonder if I switched email addresses...
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Old Aug 25, 2006, 10:03 AM
Seeing the Farside.
Blaze.45's Avatar
Seattle WA, USA
Joined Aug 2005
4,285 Posts
Wooo, changing my order to Brushless version!
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Old Aug 25, 2006, 11:30 AM
Registered User
Taipei, Taiwan
Joined Oct 2005
4,663 Posts
Hi Tram & JawaSnack,

I'm afraid that your e-mail addresses have been lost due to some
unknown reasons. Would you contact joyce@gws.com.tw for
having informations needed.

Hi mtbrider,

You'd need to push J.P. placing orders for you earlier.

Chen
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Old Aug 25, 2006, 11:36 AM
Who put that TREE there!!
Columbia, MO
Joined Dec 2005
622 Posts
ok, I sent her another email... *crosses fingers*
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Old Aug 25, 2006, 12:30 PM
Pusher jets rule!
crxmanpat's Avatar
Mesa, AZ
Joined Jan 2006
17,116 Posts
Of all the schemes posted above, I like the F model of the 347th Fighter Group. Now, all I need to do is find a .gif of the shark mouth.

Pat
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Old Aug 25, 2006, 01:57 PM
Callsign: CornDog
HawkLover's Avatar
Milpitas, CA
Joined May 2003
5,364 Posts
I see that PB Hobbies is having a sale. Does anyone have any thoughts about dual BP-12's or BP-21's? The 21's would pull about 26 amps using an 8x4, and the 12's would pull about 18 amps using an 8x4 prop. The 21's would produce about 42 ounces of thrust and the 12's about 38.
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Old Aug 25, 2006, 02:06 PM
Ship first, Improve often
L0stS0ul's Avatar
Virginia
Joined Apr 2005
5,008 Posts
Until GWS put up option of their motors I was thinking of going 2 BP-12's on either an 8x4 or maybe even a little smaller depending. I don't think this plane is gonna need almost 40 ounces of thrust I'd probably try to shoot for about 15 amps max on both BP-12's at full throttle. Maybe the 7x3.5 HD props on it. Otherwise I'd just stick with the 8x4's

What does GWS recommend as far as number of servos, speed controllers, and battery for the dual brushless setup they are selling? I see that there are dual aileron servos from the pictures so at least 4 naro size servos. 2 for ailerons 1 for nose steering, and 1 for elevator. Is it recommended to use 1 speed controller or 2. If 2 speed controllers are they recommending dual batteries or just doing 1 pack feeding both speed controllers. What size battery is recommended? I only use lipos so would you want to use 3 cells on the supplied motors or 2 cells?

Thanks I wanna start picking up the items when I see them at my LHS. I also need to put in an order for some new lipos soon so knowning that I can save on some shipping.

Thanks
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Old Aug 25, 2006, 02:10 PM
AMA 353531
rdeis's Avatar
United States, CO, Colorado Springs
Joined Aug 2003
6,543 Posts
Quote:
Originally Posted by HawkLover
I see that PB Hobbies is having a sale. Does anyone have any thoughts about dual BP-12's or BP-21's? The 21's would pull about 26 amps using an 8x4, and the 12's would pull about 18 amps using an 8x4 prop. The 21's would produce about 42 ounces of thrust and the 12's about 38.
At what speed?

Based on the weights we're guessing, ~40mph pitch speed and >20oz of thrust should be more than you could want, so either would do if they're fast enough. I expect you'd be happier with 7x6 props than 8x4.


IMO, Amps isn't much of useful predictor for anything other than battery weight.
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Old Aug 25, 2006, 02:15 PM
Unrepentant Carnivore
jamesdr's Avatar
Brandon, Fl
Joined Mar 2005
2,499 Posts
I'm ordering the dual BL2208 model BUT if I were to mount some BP's on there, I'd go with the -12. They are aproximate .10 - .15 nitro replacements and will take a 9" prop better than the -21's. My experience with the -21 (and the TowerPro 2408-21) is they run very fast and hot and really don't tolerate anything bigger than a 8x4 as you noted. The extra inch is worth the thrust. My 2 cents.

Jim
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Old Aug 25, 2006, 02:43 PM
Ship first, Improve often
L0stS0ul's Avatar
Virginia
Joined Apr 2005
5,008 Posts
The BP-12 on a 9x5 prop is around 23-24 ounces of thrust at full throttle pulling right around 12 amps (almost 50 ounces at 24amps for 2 of them). I seriously don't think you need that much thrust on this plane. I'd rather prop it down and increase the pitch speed and loose some thrust and loose some amp draw. Get it down around 12 amps and fly longer and faster. Almost 50 ounces of thrust is just not needed. IMHO.

I'd probably try a 7x6 or maybe even the 7x3.5 HD (gotta test that one, not sure how large a drop in thrust it would be) prop on the BP-12's depending on how much thrust I wanted. Even the BP-21 on a 7x6 would be nice with a slightly higher amp draw and speed.

I'm guessing though.
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Last edited by L0stS0ul; Aug 25, 2006 at 02:48 PM.
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Old Aug 25, 2006, 04:11 PM
Watts Rule, Glows Drool
dogon1013's Avatar
orlando, FL
Joined Mar 2003
3,197 Posts
here is the link to the GWS brushless motor included with the kit.
http://www.gws.com.tw/english/produc...r/gwblm002.htm

it looks like 3 cells and the 9*5 prop might be the way to go. or maybe 8*4 if you want more runtime.
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Old Aug 25, 2006, 04:25 PM
Callsign: CornDog
HawkLover's Avatar
Milpitas, CA
Joined May 2003
5,364 Posts
Thanks guys for the useful information. I think I may have my answer now. I want to see if I can run to of the BP motors on a single ESC ... I've got a spare 35 amp Jetti ESC I'm not using at the moment. I'm also thinking reduced prop length and increased pitch it the ticket here. That advantage of dual props makes it easier to prop down while still having enough thrust!

BTW, I agree that anything over 30 - 35 ounces of thrust is just too much, depending on the final weight.

Lastly, because I like to modify things, I'm thinking I will do my ailerons with a single servo. Lets not stress the BEC on the ESC!
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