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Old Jan 11, 2004, 11:36 PM
Artillery! King of Battle!
Brill 1's Avatar
USA, KS, Scammon
Joined Mar 2002
4,431 Posts
Coverting my Top-Flite AT-6 Texan to e-Power!

I decided tonight to see if I could convert my TF AT-6 to e-power. It weighs right at 9lbs (144oz) empty on glow power. I started by removing the OS .61FX, muffler, fuel valve, throttle servo,rx battery and fuel tank. Fuselage weighs 3lbs 2oz and wing 3lbs 4oz, total 6lbs 6oz (102oz), not bad!

I am using standard servos, six of them at 1 3/4oz, I am going to replace them with 6 HS-85s at 3/4oz, 6oz savings! Also I am replacing the Robart tires with Dubro diamond tread foamies, another 2oz savings, total weight 5lbs 14oz (94oz). Looking good!

I am planing on using a AXI 4120/18 motor (11.25oz), CC Phoenix 60 (2oz) and 20 GP3300 cells (34oz), total so far 141.25 oz.

UBEC (0.8oz), TT AT-6 spinner (2oz), APC 13x9-E prop (?oz) and motor mount (?oz) call it 12 oz to be safe, total 154 (rounding up!)

9lbs 10oz!!!!! Only a 10oz increase from glow power!!!!

MotoCalc is showing 39amps, 84W/lb, 7925RPM, 99oz of static thrust and 67.5 pitch speed.

Do these numbers look good enough to fly and will the HS-85s be enough servo?

If you can't tell I am excited! I love my AT-6, but wanted a e-power warbird, now it looks like I can keep her.

Thanks and please let me know if I have over-looked anything.

Brian
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Old Jan 12, 2004, 10:48 AM
Electric baptism 1975
DavidN's Avatar
Vernon, BC, Canada
Joined Dec 2000
2,926 Posts
Hi Brian
Overall sounds quite "doable"
I would want a 225 on the elevator. I am trying to figure out what the 6 servos are for. In your calculation did you drop the throttle servo? What are you using for retracts? If they are air you can go to the smallest servo you have. If mechanical youneed the full retract servo.
DavidN
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Old Jan 12, 2004, 11:36 AM
Artillery! King of Battle!
Brill 1's Avatar
USA, KS, Scammon
Joined Mar 2002
4,431 Posts
Sorry, should of be more specific.

I have 4 servos in the wing, ailerons and flaps and three in the fuselage, elevator, rudder and a micro on the retracts.

I think I am changing my motor to an AXI 4130/16 on a 14x10 with 20-cells. It is more eff. and doesn't tax the motor as much.

Thanks for the heads-up on the servos, I have a bunch of HS-225s just siiting around, I might replace them all the way around.

Later
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Old Jan 12, 2004, 12:26 PM
Registered User
Oak Harbor, Washington, United States
Joined Jan 2001
1,183 Posts
I don't think I'd risk the plane by using the Hitec 85's, I'd go with the 225's. I have a TF-P47, Maxcim powered, at 10.5 lbs. RTF with 25 FAUP 1950's, (recent change from RC2000's), and it flies great. Mine uses all standard servos BTW. Good luck with your T-6

Norm
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Old Jan 12, 2004, 12:46 PM
Artillery! King of Battle!
Brill 1's Avatar
USA, KS, Scammon
Joined Mar 2002
4,431 Posts
Norm, glad to here about e-powered TF warbirds!!! What Maxcim setup are you using? I would like to stay at 20-cells if possible on my Texan. I am also thinking of leaving the standard servos in and see what the AUW weight with motor and batteries is.

Trying to get a table at a swap-meet this weekend, got some stuff to sell to help pay for this conversion.

Later

Brian
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Old Jan 12, 2004, 03:38 PM
Registered User
Oak Harbor, Washington, United States
Joined Jan 2001
1,183 Posts
Brian, I think there are several TF warbirds powered with Maxcim systems. Check www.maxcim.com for some in the customer's gallery.

Mine is powered by a Maxcim N32-13Y, MEC Monsterbox, 5:1 ratio, four blade APC-Pattern 15.5x12 prop, currently on 25 FAUP 1950 cells. I set my timer for 6 minute flights. During that time I make several passes that include rolls, point rolls, inverted flight, knife edge, victory rolls on a 60 degree up line, dirty passes with gear and flap down, etc.

I have the Century Jet retracts with VERY heavy scale wheels, all of which I bought when I thought I was going to power it with a glow engine. I have ripped the gear out a couple of time, but without serious damage. My fault each time.

BTW, my first power system was on a Maxcim "D" wind motor and 18 cells. Flew okay, but really needed more power. Probably would be better now with the light weight FAUP 1950 cells.
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