Espritmodel.com Telemetry Radio
Reply
Thread Tools
This thread is privately moderated by RAY GWS, who may elect to delete unwanted replies.
Old Feb 09, 2008, 10:43 PM
Pusher jets rule!
crxmanpat's Avatar
Mesa, AZ
Joined Jan 2006
17,187 Posts
I'm only at 26oz AUW fully dressed with LG.

Pat
crxmanpat is offline Find More Posts by crxmanpat
Reply With Quote
Sign up now
to remove ads between posts
Old Feb 10, 2008, 03:33 AM
Registered User
kensp's Avatar
Darwin Australia
Joined May 2002
6,960 Posts
My EPO GWS-40 with a GWS 3008 Outrunner flies well at 28 oz.

I do not think that 32 oz would be too heavy provided you have the power of a larger motor.

Ken
kensp is offline Find More Posts by kensp
Reply With Quote
Old Feb 10, 2008, 09:54 AM
Hooper, full throttle!
Tommy D's Avatar
USA, NY, East Islip
Joined Feb 2004
11,052 Posts
Thanks Guys

Truth be told I tested the lighter setup <meaning around 29zs> and got 305W on 3S. Thats a little low for my flying style so it looks like Ill maiden it on 4S. It looks like there is plenty of room to set the pack at or about the CG so I can switch between the 3S and 4S packs.

Biggest surprise was it looks like it's VERY nose heavy! Go figure!

Tommy D
Tommy D is offline Find More Posts by Tommy D
Reply With Quote
Old Feb 10, 2008, 10:05 AM
Registered User
SMRTIC's Avatar
Joined Jan 2007
433 Posts
So does anyone know when I will be able to find these things on the shelf anywhere in the states?
SMRTIC is offline Find More Posts by SMRTIC
Reply With Quote
Old Feb 10, 2008, 10:15 AM
Registered User
Taipei, Taiwan
Joined Oct 2005
4,676 Posts
Just visit www.caliberhobby.com if you could not find it out at your LHS.

Chen
GWS CHEN is offline Find More Posts by GWS CHEN
Reply With Quote
Old Feb 10, 2008, 02:43 PM
Registered User
kensp's Avatar
Darwin Australia
Joined May 2002
6,960 Posts
Quote:
Originally Posted by Tommy D
Thanks Guys

Truth be told I tested the lighter setup <meaning around 29zs> and got 305W on 3S. Thats a little low for my flying style so it looks like Ill maiden it on 4S. It looks like there is plenty of room to set the pack at or about the CG so I can switch between the 3S and 4S packs.

Biggest surprise was it looks like it's VERY nose heavy! Go figure!

Tommy D
My EPS GWS 40 has unlimited vertical and a 42 MPH top speed on 145 Watts and my EPO GWS-40 has unlimited vertical and a 52 MPH top speed on 207 Watts. I wonder what your flying style is if you will need more that 300 Watts. E3D? Pylon Racing?

Edit:- The scale top speed for a GWS-40 is 32 MPH.

Ken
kensp is offline Find More Posts by kensp
Last edited by kensp; Feb 10, 2008 at 03:06 PM.
Reply With Quote
Old Feb 10, 2008, 05:11 PM
Hooper, full throttle!
Tommy D's Avatar
USA, NY, East Islip
Joined Feb 2004
11,052 Posts
Ken

3 times scale speed sounds like a good start.

Tommy D
Tommy D is offline Find More Posts by Tommy D
Reply With Quote
Old Feb 10, 2008, 05:16 PM
Registered User
kensp's Avatar
Darwin Australia
Joined May 2002
6,960 Posts
Quote:
Originally Posted by Tommy D
Ken

3 times scale speed sounds like a good start.

Tommy D
Because drag goes up by the square of speed one would expect to need somewhere around 700 Watts to drive a GWS-40 to 90 mph.

Ken
kensp is offline Find More Posts by kensp
Reply With Quote
Old Feb 10, 2008, 05:27 PM
Hooper, full throttle!
Tommy D's Avatar
USA, NY, East Islip
Joined Feb 2004
11,052 Posts
Ken

How did you go about recording your MPH if I might ask.

Yes 700W sounds like a nice number indeed!

Tommy D
Tommy D is offline Find More Posts by Tommy D
Reply With Quote
Old Feb 10, 2008, 05:36 PM
Registered User
kensp's Avatar
Darwin Australia
Joined May 2002
6,960 Posts
My club has two white painted pylons cemented in the ground on the far side of the field for use when they hold pylon races. Taking the time between the pylons give the speed. This requires that no wind be blowing or runs in two directions that are averaged.

Ken
kensp is offline Find More Posts by kensp
Last edited by kensp; Feb 10, 2008 at 05:41 PM.
Reply With Quote
Old Feb 10, 2008, 05:38 PM
Hooper, full throttle!
Tommy D's Avatar
USA, NY, East Islip
Joined Feb 2004
11,052 Posts
How accurate do you think it is Ken? Perhaps a Video of the flight could backup the numbers via a Doppler reading.

Tommy D
Tommy D is offline Find More Posts by Tommy D
Reply With Quote
Old Feb 10, 2008, 05:54 PM
Registered User
kensp's Avatar
Darwin Australia
Joined May 2002
6,960 Posts
Quote:
Originally Posted by Tommy D
How accurate do you think it is Ken? Perhaps a Video of the flight could backup the numbers via a Doppler reading.

Tommy D
My club has not tried Doppler but they have an electronic timing set up that has proved to be very accurate. Some of our members are keen pylon racers and compete in the Pylon Racing at the Australian Nationals Competitions so they want accurate speed-readings when testing models.

A hand operated stopwatch and flagmen is not as accurate but are good enough for sports flying.

After using electronic timing over a set distance club member do not trust radar.

Ken
kensp is offline Find More Posts by kensp
Reply With Quote
Old Feb 10, 2008, 09:54 PM
hotrod builder
usmc_VTOL_mech's Avatar
United States, TX, Arlington
Joined Jun 2007
1,156 Posts
Quote:
EPO GWS-40 has unlimited vertical and a 52 MPH top speed on 207 Watts.
Ken I very seriously doubt this statement from you when you say you are running at 207 watts
I am running over 400 watts thru mine and she tops out at around the 500 foot mark...when you say unlimited vertical it means it doesn't stop going up even after you can't see it anymore...or maybe your eyes are going
usmc_VTOL_mech is offline Find More Posts by usmc_VTOL_mech
Reply With Quote
Old Feb 11, 2008, 01:45 AM
Registered User
kensp's Avatar
Darwin Australia
Joined May 2002
6,960 Posts
Quote:
Originally Posted by usmc_VTOL_mech
Ken I very seriously doubt this statement from you when you say you are running at 207 watts
I am running over 400 watts thru mine and she tops out at around the 500 foot mark...when you say unlimited vertical it means it doesn't stop going up even after you can't see it anymore...or maybe your eyes are going
By law my club flying field has a maximum height limit 400 feet for model aircraft and a minimum height of 600 feet for full sized aircraft. The club field is about 5 Km from an international airport so we have to strictly observe the Law.

So I have to cease climbing at the estimated 400 foot level but the models would keep on going up if I did not stop climbing. I use the GWS 10 x 6 x 3 blade propeller and the models have a thrust to weight ratio of 1.34:1 for the EPS GWS-40 and 1.11:1 for the EPO GWS-40. By limiting my top speed I get a better climb. As well I take great care to select the best aircraft, motor and propeller combination. Also to keep my weight down, I do not use a battery that gives more than 8 minutes flying at WOT.

Ken
kensp is offline Find More Posts by kensp
Reply With Quote
Old Feb 11, 2008, 08:47 PM
hotrod builder
usmc_VTOL_mech's Avatar
United States, TX, Arlington
Joined Jun 2007
1,156 Posts
yeah...ok
usmc_VTOL_mech is offline Find More Posts by usmc_VTOL_mech
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion ****GWS-40: The Never-Ending Legend of Flying Tigers**** RAY GWS Product Announcements 2 Sep 01, 2007 09:45 AM
NIB GWS 40 EDF units bruff Aircraft - Electric - Airplanes (FS/W) 2 Sep 10, 2004 08:39 PM
hypethetical idea re: a never ending e-flight Dax Parkflyers 7 Feb 20, 2003 04:24 PM
Flying Tigers AVG dottney Scale Kit/Scratch Built 2 Feb 13, 2003 09:45 PM
Never ending problems adam_jorgensen Electric Heli Talk 7 May 28, 2002 11:51 AM