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Old 02-29-2008, 06:26 PM   #1
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GWS A-10

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I bought a GWS A-10 long ago but am now just getting around to finishing it up for the upcoming season. I am new to electric flight and I want to go with Li-Po's on this project. What would be an appropriate choice that would not fry my motors? I have a Hobbico Quick MKII charger. I read on Hobbicos website that they can do up to 3 cell Li-Po and Li-Ion. I also have no clue as to the type of electric speed control to put in it. I am not using the stock engines and fans I turfed those right away. I have an upgrade kit with fans, engines, and nacelles. The kit says on the package EDF-150 complete conversion kit. But that is all it says.

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Old 02-29-2008, 07:08 PM   #2
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Did you mean EDP150? as in propeller conversion from fan?

6 to 10.8 Volts, depending on the propeller used,

Spec sheet here

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Old 02-29-2008, 07:23 PM   #3
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Nope mine was a kit with 6 blade ducted fans, new foam nacelles, and upgraded motors.
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Old 03-01-2008, 06:26 AM   #4
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Getting back to your main question: what size li-poly packs do you need?

The easiest way of doimg this is to first make sure that your speed controller is set up for lipoly. You can get away with using a nicd/nimh ESC but you have to track your flying time to make sure that you don't fry the lipoly since the cutoff voltage for nicd/nimh's is below the drop-dead oltage for lipolys. At least that's the quick-and-dirty answer for that.

Also, the charger MUST be lipoly capable. Sounds like yours is OK for the size that you'll need

Next is to look at the recommended battery pack size (voltage and mah rating).

Round the voltage up to the next multiple of 3.7 volts and that's the number of series batteries you'll need.

MAH rating is to take the recommended mah rating of the nicd/nimh pack and divide that by .8 (eg 750 mah for nicd/nimh becomes 1000 mah to give you the same flying time). Reason: the gurus on lipolys that I hang out with state taht getting under 20% of the rated capacity of the pack leaves you at risk for draining the pack under the critical voltage.

Alternate for that is to figure out what the flying time for 8-% of your pack is.

C rating on the pack is dependent upon the maximum draw of the motors and how long you'll be there. Check the other forums (see below) for discussions. The higher the C rating, the more they'll cost. Again, drawing for extended periods at the maximum rating (or close to it) for the pack does not do it any good.

I'd also check out other threads here on RCCanada, as well as RCGroups and RCUniverse. Since this is an established kit and has been around for years, there's lots of knowledge posted. You have to dig for it.

Another good source for materials and ideas is the Electric Model Flyers of Southern Ontario (
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Old 04-10-2008, 02:16 PM   #5
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Well I have the standard setup with the 6 blade fans and stock motors.Can't remember the size of the motors but I was told not to use what I had and that was a Thunder power 3/2100 Lipo.Well I have flown this setup with a 30 amp brushed controller and have over well over 50 flights on this setup.Never a problem maybe I'm just lucky or ?.Anyways I was told not to as the motor can't handly the power of the cells but its still flying for over three years now.I have one servo for the elevator and one for the ailerons and as I said a 30 amp controller.And I do use the throttle allot so its not that I go slow.I had this setup at the KW flyen a couple years back and guys were surprised to find out that it was a stock setup with motor and fans and many had thought I had a brushless setup.By the way I saw two guys that day with them tucked under there arms after they had talk to me.The A-10 is in the hands of my brother this season as I am flying my Alfa F86 sabre as this one is setup with a complete brushless setup and loves to turn and burn.I have a set of drop tanks to put onto the F86 this season so I have to get that done as well as finish up on a couple builds.Hope this can help you out a little as I was affraid at first with the stock setup but it works good for me and I hope you can enjoy the same from yours.John
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