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Aug 12, 2007, 02:59 AM
Registered User
kensp's Avatar
Originally Posted by metalbuggy
How much would I have to prop down to run these on a 3S?
I have two 25A ESC's to use.
I do not think that the use of three cells with the 2205 is viable as both the motor and propeller efficiency is less and therefor the performance will not be improved. Remember the GWS-38 has 2 1/4 inch spinners so only about 1-1 1/2 inches of propeller will be exposed to airflow each side of the spinner.

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Aug 16, 2007, 10:58 AM
Registered User
jamesdr, thank you for posting the photos. I was trying to figure out how to mount those motors to GWS mounts and finally gave up and went on to assembling the plane and setting everything else up. Now with the photos, I can mount the motors. Thanks again, Gene
Aug 16, 2007, 10:13 PM
Registered User
jamesdr, are those GWS 400 size motor mounts? I ask, because the 350 motor mounts seem too small in diameter.
Aug 17, 2007, 01:06 AM
Registered User
Well, I'm still waiting for the motor mounts that I ordered along with the motors from Raidentech. I received the motors but they didn't send the motor mounts. They circled the item on the "paperwork" so I know that whoever packed the order knew that the motor mounts were not included in the shipment. Two e-mails and I get a response "We're looking into it". I've never had this problem with Raidentech before. Did they change owners or something?
Aug 17, 2007, 01:21 AM
Unrepentant Carnivore
jamesdr's Avatar

I think they are 400's - they came with the motors. (From Raidentech by the way)

Aug 17, 2007, 03:06 AM
Registered User
kensp's Avatar
The GWS EPS-400 mounts are black and the inside diameter is 32.5mm. The GWS EPS- 300/350 mounts are gray and the inside diameter is 28.6mm.

Aug 18, 2007, 02:13 AM
Registered User
Thanks Ken.
Aug 25, 2007, 10:50 AM
maidened my p38 today......very nice,stock BL motors and a 2150 3s battery.very scale like...will post video when i can,thanks GWS for such a nice plane
Aug 26, 2007, 05:50 AM
heres the vido of the maiden...enjoy
Aug 26, 2007, 07:48 AM
Never Trade Luck for Skill
MERLIN V16's Avatar
Very Nice Taxdoger! Congrads on the maiden!
Aug 26, 2007, 08:31 AM
cheers mate,big weekend for me with the p38 and F15 maiden!!!!!!!!!

theres no way it all would have worked with out all the help from every one on this site

cheers guys
Aug 27, 2007, 07:08 PM
Super Genius
MtnBikeGeek's Avatar

Power Question

Do you think a couple of these will power the 38 well enough? They're Scorpion 2208-30's and I'm hoping to get by with 2S for now.

Aug 27, 2007, 07:49 PM
Registered User
kensp's Avatar
Originally Posted by MtnBikeGeek
Do you think a couple of these will power the 38 well enough? They're Scorpion 2208-30's and I'm hoping to get by with 2S for now.

Using the motor parameters supplied by the web site, MotoCalc predicts:-

Scorpion 2208-30 motor, GWS 9 x 5 x 3 blade counter rotating propellers and a Hextronic 2200 mAh 3 cell 20 C battery pack.

Static running before launch.
Motor Amps = 26.1
Motor Volts = 10.4
Input (W) = 270.3
Prop RPM = 5872
Thrust (oz) = 43.5
PSpd (mph) = 27.8

Flying predictions.
Top speed at Wide Open Throttle = 48 mph
Duration at top speed with a 2200 mAh 3 cell 20 C battery = 14 minutes.

The combination looks to be an excellent choice. The efficiency when on the ground is not good but it improves greatly once the propellers unload in flight.The current draw drops greatly when the model is flying and this is a characteristic of the new GWS HD 3 Blade propellers on this twin engined model.

Aug 27, 2007, 07:49 PM
hotrod builder
usmc_VTOL_mech's Avatar
very doubtful those motors will work with a 2 cell lipo
3 cell yes, 2 cell maybe but it will be going slow you might get passed by a slowstick

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