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Old Oct 31, 2006, 08:38 PM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
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Sorry, since waitting for motors, P38 production was delayed.

However, if the motors supplied still can not be on time, GWS will ship NPS verion P38 together with GWS 262 NPS and SG version at mid of Nov. from China factory.

So the shops will be able to get the kits befor Christmas.
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Old Oct 31, 2006, 09:27 PM
Pusher jets rule!
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Mesa, AZ
Joined Jan 2006
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Guy,

I have not taken any measurements (except static amp draw, which was 22.3 I think), but it seems like it's close to your 3S numbers.

OK, I just went and took some numbers. On 3S static, 11.7v, 22 total amps, 230 watts. I don't have a way to measure thrust yet. I'm sure the in air amp draw is much less.

Pat
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Old Oct 31, 2006, 09:48 PM
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Yeah -- 22 amps is too much for me... 13.5 amps sounds much better.

I'm going to try it and see if it works... I already have one motor and speed control (the Eflite P-47 is going to be retired), so I really only have to buy one motor and one speed control for the GWS-38.

Mr. Lin -- since the GWS-38 production was delayed, should I assume my GWS-38 will not arrive until December? If so, that's okay -- I have lots of other projects to keep me busy until then!
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Old Oct 31, 2006, 10:01 PM
Pusher jets rule!
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Mesa, AZ
Joined Jan 2006
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Guy,

So you're looking to pull only 13.5 amps total (static), not per side? My 22 is total, so I'm only pulling 11 per side, and probably less than that in the air.

Is there a setup available that would do 13.5 amps total on both motors, and still fly a 2lb plane?

Pat
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Old Oct 31, 2006, 11:05 PM
Future NFL Champs
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High Ridge, Mo USA
Joined May 2002
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Quote:
However, if the motors supplied still can not be on time, GWS will ship NPS verion P38 together with GWS 262 NPS and SG version at mid of Nov. from China factory.
By all means get the slope glider and NPS kits into stores ASAP!
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Old Nov 01, 2006, 12:22 AM
Wandering IT geek
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United States, NV, Reno
Joined Aug 2005
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Quote:
Originally Posted by GWS4CEO
Sorry, since waitting for motors, P38 production was delayed.

However, if the motors supplied still can not be on time, GWS will ship NPS verion P38 together with GWS 262 NPS and SG version at mid of Nov. from China factory.

So the shops will be able to get the kits befor Christmas.
Argh!!!!!!!!!!!!!!!!! I'll call my LHS and get them to hold me a NPS GWS38 then!
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Old Nov 01, 2006, 01:09 AM
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Darwin Australia
Joined May 2002
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Quote:
Originally Posted by crxmanpat
Guy,

So you're looking to pull only 13.5 amps total (static), not per side? My 22 is total, so I'm only pulling 11 per side, and probably less than that in the air.

Is there a setup available that would do 13.5 amps total on both motors, and still fly a 2lb plane?

Pat
Pat

Less amp draw means a smaller and lighter battery can be used. A lighter battery means a lighter aeroplane . A lighter aeroplane means less power is needed to fly. If you are drawing 13.5 amps then you can use a battery that weighs less than 100 grams (3.6 oz).

13.5Amps*11 Volts equals 148 Watts. Divide by 2 and you get 74 Watts per pound and 70 Watts per pound is considered a good power to weight ratio for aerobatics.

Ken
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Old Nov 01, 2006, 07:20 AM
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Quote:
Originally Posted by crxmanpat
So you're looking to pull only 13.5 amps total (static), not per side?
Yes -- 13.5 amps total (static) -- not per side.

Quote:
Originally Posted by crxmanpat
My 22 is total, so I'm only pulling 11 per side, and probably less than that in the air.
Right -- this is how my other P-38's have always turned out. I'm going to try something different this time.

Quote:
Originally Posted by crxmanpat
Is there a setup available that would do 13.5 amps total on both motors, and still fly a 2lb plane?
Well, as I said above, I'm going to try something different this time... I will let you know if it works after the maiden! (Then again, I have to start the build first!)

Here's my reasoning -- with a twin motor setup, your airplane will have twice the thrust, but will not fly any faster. I'm going to try to cut down the thrust, increase the top speed, and cut the amp draw in the process.

My first P-38 weighed 40 ounces, and had 59 ounces of static thrust...

If we assume my GWS-38 comes in around 35 to 40 ounces, I am reasonably certain it will fly on 44 ounces of total static thrust (17.2 ounces of total in-flight thrust). Warbirds like speed more than thrust anyway -- 47 mph on 3s, or 59.9 mph on 4s sounds REALLY good to me.

The big test will be tomorrow morning -- when I try the power system (well, one side of the GWS-38 power system) on my GWS ME-109. My ME-109 currently flys great with a 9x7.5E APC prop -- the only change I am making is that I am switching to an 8x8E APC prop.

If, for some strange reason, the P-38 airframe does not fly well on the 8x8 props, I can always switch back to the 9x7.5 props -- I KNOW it will fly with that! On the 9x7.5 props, at WOT, for BOTH motors: 18.22 total amps drawn, 55 ounces of total static thrust, 25.6 ounces of total in-flight thrust, 42.67 mph top speed. This amp draw is still pretty high, but it's less than the 24.8 amps my Flying Styro P-38 is drawing!!!

(I apologize for the long post!)
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Old Nov 02, 2006, 12:51 AM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
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GWS China will ship out the containers to GWS USA and GWS Taiwan on Nov. 10th of SG and NPS version both GWS38 and GWS262; and Nov. 17th. of powered version.

I wish LHS also register how many qty. they need ASAP, so we will not miss the Christmas season!
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Old Nov 02, 2006, 06:35 AM
Outcast outlaw
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Mr Lin -- what about ME-262 earlybirds?
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Old Nov 02, 2006, 06:50 AM
MN WATTS Master
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United States, MN, Mankato
Joined Jul 2003
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Quote:
Originally Posted by GWS4CEO

I wish LHS also register how many qty. they need ASAP, so we will not miss the Christmas season!

Great Planes and Horizon Hobby have not listed the 262 yet for dealers to pre-order. Hopefully they get them out there for LHS's to pre-order.
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Old Nov 02, 2006, 10:08 AM
CAN WE MAKE IT FLY?????
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Concord,N.C.
Joined Oct 2003
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ME 262 my Christmas list gets a little longer
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Old Nov 03, 2006, 08:32 AM
Outcast outlaw
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Quote:
Originally Posted by Red 61
The big test will be tomorrow morning -- when I try the power system (well, one side of the GWS-38 power system) on my GWS ME-109. My ME-109 currently flys great with a 9x7.5E APC prop -- the only change I am making is that I am switching to an 8x8E APC prop.
Well, the ME-109 flew great on the 8x8E prop... She sure seemed faster than usual (I totally forgot to run an RPM test to calculate prop pitch speed)... She didn't have quite the thrust she used to have with the 9x7.5E prop, but there was enough that I did not have any problems.

The only trouble is, it did not drop my amp draw!!! It's just under 11 amps, which means roughly 22 amps for a twin... I really want to get out of this 20+ amp draw situation with twins...
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Old Nov 03, 2006, 09:44 AM
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Makes sense to me- you upped the pitch. Same draw (more or less), less thrust, more speed.

Go to an 8x7 or 8x6 and you'll see less draw, less thrust, and near the same speed- that's what I would think you want in a twin?
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Old Nov 03, 2006, 10:55 AM
Outcast outlaw
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LOL -- no, I want less draw, less thrust, and MORE SPEED!

Honestly though, I'm confused, because the electric motor calculator web site I use has never been wrong before -- this time it was waaaaay off! Color me surprised...
Thunder Power 2100 mAh 3-cell LiPo
Himax 2025-4200
5.67:1 gear ratio
8x8 APC prop
The above should yield 6.748 amps at WOT -- but I am getting closer to 11 amps...

No biggie -- I'll figure out something!
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