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Old Jul 02, 2007, 07:15 AM
Outcast outlaw
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Quote:
Originally Posted by Eljimb0
You have too many P-38s.. You should give me one or two of them..
You're kidding, right? My OBVIOUS response to this is...

...you can NEVER have too many P-38's.
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Old Jul 02, 2007, 11:39 AM
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blue mountains
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when can you ever have too many planes...no matter what type they are?
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Old Jul 02, 2007, 12:01 PM
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ni'ihau
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Quote:
Originally Posted by taxdodger
when can you ever have too many planes...no matter what type they are?
Lots of bachelors ask this same question...
jimbo
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Old Jul 02, 2007, 05:19 PM
Pusher jets rule!
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Ken,

First of all, you lucky dog!

Are those all 9050's or a mix with 8040's?

Pat
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Old Jul 02, 2007, 07:30 PM
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Darwin Australia
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Quote:
Originally Posted by crxmanpat
Ken,

First of all, you lucky dog!

Are those all 9050's or a mix with 8040's?

Pat
One RH and one LH of the 9 x 5 x 3 blader and one RH and one LH of the 8 x 4 x 3 blader. These were included with a purchase of two sets of GWS-38 cowls and nose cones and two GWS AT-6 cowls. GWS sent the whole lot in a very solid cardboard box so none of the cowls was damaged in shipping. After unpacking I tested the box by standing on it and it had no trouble suporing my weight.

Test Results using a GWS 2208-18 outrunner on a 3 cell 1700 mAh 20 C battery were:-

GWS 8 x 4 HD Three blades
8.19 Amps
11.20 Volts
92 Watts
500 grams (17.86 oz) thrust
8,760 RPM
33.18 MPH pitch speed

GWS 9 x 5 HD Three blades
11.00 Amps
11.13 Volts
122 Watts
596 (21.29 oz)
7,080 RPM
33.52 MPH pitch speed

I have measured the size of the hole in the inserts and find that the holes are slightly undersize. See photo no 1. Investigation shows that this is because the propeller is designed to go on the threaded section of the shaft which is also slightly under the size of the straight section of the shaft.

The undersize holes in the inserts mean that the propeller will fit snugly on the threaded section of the shaft but will not fit on the unthreaded section of the shaft. See Photos 2 and 3.

Ken
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Old Jul 02, 2007, 10:04 PM
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Darwin Australia
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I have now fitted the Rh and LH rotation propellers. The motors have been run using the 1300 nAh 3 20C 3 cell battery out of my AT-6.

The results for the two motors are:-
18.9 Amps
10.56 Volts
202 Watts
6570 RPM on the port motor.

IMPORTANT NOTE:- I recomend that a Nylock nut be used to retain the reverse rotation propeller. On my first test run I did not and the nomal nut screwed off while running. I replaced the normal nut with a Nylock nut and I had no more problems.

Ken
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Old Jul 02, 2007, 10:18 PM
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United States, CA, SF
Joined Aug 2004
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Quote:
Originally Posted by kensp
I have now fitted the Rh and LH rotation propellers. The motors have been run using the 1300 nAh 3 20C 3 cell battery out of my AT-6.

The results for the two motors are:-
18.9 Amps
10.56 Volts
202 Watts
6570 RPM on the port motor.

IMPORTANT NOTE:- I recomend that a Nylock nut be used to retain the reverse rotation propeller. On my first test run I did not and the nomal nut screwed off while running. I replaced the normal nut with a Nylock nut and I had no more problems.

Ken
Looks nice. Where did you get the spinner back plates for the 3 blade props?

Also the battery capacity sounds like a bit small compared to the Amp draw. How long can you fly it using this setup?
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Old Jul 02, 2007, 10:35 PM
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Taipei, Taiwan
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Hi Ken,

Your advice is great ! Two Nylock nuts would be much better.
Three bladed propellers made your GWS-38 more scale.

Chen
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Old Jul 02, 2007, 10:44 PM
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ni'ihau
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I have mounted a pair of those new props 8X4 (3) on a contra rotating test motor
210 watts 10,000 rpm a little more than 2 pounds of thrust
see:
http://www.rcgroups.com/forums/showp...&postcount=737
The props are great!!
thanks Chen,
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Old Jul 02, 2007, 10:55 PM
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Hi Eljimb0,

You did a great test, too. Thanks

Chen
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Old Jul 02, 2007, 11:36 PM
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ni'ihau
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Chen,
Why don't you guys hire me. I think I would like to work for GWS.
jimbo
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Old Jul 02, 2007, 11:56 PM
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Jimbo,

Would you send PM inculding your resume to my boss. Be reminded it's been off topic.

Chen
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Old Jul 03, 2007, 12:29 AM
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Darwin Australia
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Quote:
Originally Posted by shschon
Looks nice. Where did you get the spinner back plates for the 3 blade props?

Also the battery capacity sounds like a bit small compared to the Amp draw. How long can you fly it using this setup?
I cut two extra pieces out of GWS Mustang spinner back plates so that I would have spinners available for a test flight as soon as the wind drops.

I am using the 1300 mAh battery because it is similar weight to the 1800 mAh 2 cell pack previously fitted. I just want a test aeroplane to check out the propellers. The main reason for testing is to establish if the 3 blade propellers are viable. I did not want to have the hassles of re-establishing the original CG with a much heavier battery.

Once the tests flights are completed then my GWS-38 will be returned to its 2 cell form. This morning when I first test ran the motors I held the aeroplane in a vertical position and I had to use quite a lot of force to prevent the 38 from being pulled out of my hand. This is more equivalent to a scale model of the space shuttle than one of a P-38.

The 3 blade propellers do seem to be viable, so I plan to use the 10 x 6 x3 blade HD propeller on my coming GWS-40.

Ken
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Old Jul 03, 2007, 12:36 AM
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Darwin Australia
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Quote:
Originally Posted by GWS CHEN
Hi Ken,

Your advice is great ! Two Nylock nuts would be much better.
Three bladed propellers made your GWS-38 more scale.

Chen
Yes! They do look more scale but I would prefer a higher pitch so I would have more speed and less thrust. A 3 blade version of the 9 x 7.5 HD propeller would be lovely.

Ken
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Old Jul 03, 2007, 01:25 AM
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Taipei, Taiwan
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Ken,

I agree that both HD9075x3 and HD1080x3 would be more lovely
for bigger motor or high C rating pack. I'd like to keep boss well informed of this idea.

Chen
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