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Old Dec 26, 2012, 01:57 AM
Registered User
United States, NC, Troy
Joined Dec 2008
238 Posts
Question
House of Balsa AT-6 Texan Glow to Electric

I have an older House of Balse airframe that I'd like to electrify. Wingspan is 44", wing area is 319 sq inches and the proposed (glow) weight was 2.5 to 3.0 pounds. Wing loading was 18 to 21 oz / sq foot.

Given the power of electric motors, I'm assuming there is a combination that will fly this airframe. Can you help by suggesting motor/battery/prop combinations to get me started?

It may be that balancing is a bigger issue, trying to get enough weight forward.

This was supposed to fly on a .19 to .25 glow engine.

Thanks for your help!
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Old Dec 27, 2012, 10:34 PM
Registered User
Oakland township, Michigan
Joined Jun 2005
754 Posts
Hi,

If you go with a 3S battery, you will need a motor with a kv of about 900 such as a Hacker A30-10xl. This is probably a little too big for the plane. A Hacker A30-14L with a kv of about 800 would also work, but it would be better with a 4s battery. From the E-flite line, the Power 15 would also work.

Good luck,

Teo
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Old Dec 30, 2012, 05:24 PM
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catspaw's Avatar
United States, WI, Stoughton
Joined May 2003
102 Posts
Tag for replies.

I built one of these from scratch back in the late 80's when MAN re-ran the construction article. Put a OS20 in it, IIRC. Since I was still a rookie flyer, I had my instructor try it.
It was kinda twitchy because it came out heavy. I tried to fly it myself, ONCE, with not-so-nice results. Wound up selling it.

The reason it came out so heavy, was that the plans built differed from the kit in that the turtledeck was made from shaped foam instead of balsa like the kit. I didn't like the roughness of the foam, so I coated it with a solution of epoxy and microballoons.had to balance that out with lead in the nose, so you can guess why it was so heavy...

So anyway, I still have the plans I built it from, so maybe I'll try it again someday?
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Old Jan 01, 2013, 11:57 AM
Registered User
United States, NC, Troy
Joined Dec 2008
238 Posts
Quote:
Originally Posted by viva_peru View Post
Hi,

If you go with a 3S battery, you will need a motor with a kv of about 900 such as a Hacker A30-10xl. This is probably a little too big for the plane. A Hacker A30-14L with a kv of about 800 would also work, but it would be better with a 4s battery. From the E-flite line, the Power 15 would also work.

Good luck,

Teo
Thanks! That'll get me started. It may be that it's a beast to fly, but will be a fun project, I think.
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Old Jan 01, 2013, 01:49 PM
Registered User
The high desert of Southern California
Joined Jul 2002
1,234 Posts
Well you could use a Tacon 15, 3s battery, 12X5 prop. Will give about 4 pounds of thrust

Motor
http://www.hobbypartz.com/96m602-big...826-950kv.html

ESC
http://www.hobbypartz.com/07e06-proton-60a.html

battery
http://www.hobbypartz.com/98p-25c-2200-3s1p.html

http://www.hobbypartz.com/98p-25c-3300-3s1p.html

If you upped the motor to a Tacon 25, and a 12X8 3 bladed prop, you would get another pound of thrust.

Here is the online calc program I used.

http://www.s4a.ch/eflight/motorcalc_e.htm

Buzz
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Old Jan 04, 2013, 05:08 PM
Balsa Flies Better!
Stamford, CT
Joined Oct 2000
6,761 Posts
I had one of these and flew it on an HB;.25 many years ago... A few things come to mind..

1) Make sure that you have lots of washout! Without enough washout- this airplane was a tip stalling and ground smacking nightmare.
2) The HB-25 was too much power- most of what happened at the upper ranges was that there was more racket, but not a lot more speed.
3) I would NOT use a larger than glow prop as has been suggested earlier. Thrust is an irrelevant consideration here. I recall running an 8 x 6 prop. The gear is pretty short, so you can't go much larger.
4) I'd look for about a 350-400 watt setup on this size prop- this should emulate the glow engine pretty well. Make sure that you have plenty of battery - i.e. something like a 3 cell 3000-3700 size pack. You want at least 4 minutes at full bore- maybe 6, so a lot of typical electric setups won't work all that well (i.e. 20 C).
5) This airplane comes down in a hurry.
6) Do NOT use the stupid aileron cable setup in the kit- just go to separate aileron servos. That was another PITA and the ailerons never centered properly.

HTH

Sam
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Old Jan 05, 2013, 03:50 PM
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catspaw's Avatar
United States, WI, Stoughton
Joined May 2003
102 Posts
Playing around with the ecalc.ch power calculator, and various motor/prop/battery combinations, I couldn't get anything that didn't look ridicilous in way or another. I know this plane is limited to a small prop, but trying to get some combination of motor, battery, and thrust that was meaningful w/o overloading some component or another was very difficult.
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Old Jan 06, 2013, 08:11 PM
Balsa Flies Better!
Stamford, CT
Joined Oct 2000
6,761 Posts
It's not hard. Jeti Phasor 15-4, 8 x 6 prop or 8.5 x 5 prop, 3s 2500-3000 mAH pack and you'll have a flyable airplane.

Sam
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Old Jan 08, 2013, 12:39 AM
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United States, TX, Houston
Joined Nov 2003
1,486 Posts
Mine flew great on an Uberall Nippy Black 2510/114 and a 3s 1500 Kokam. I did make quite a few lightening holes in all the sheet balsa and plywood though.
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Old Jan 26, 2013, 09:58 AM
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United States, NC, Troy
Joined Dec 2008
238 Posts
Thanks for the suggestions, guys. I have it out this morning and am going to do some weight reduction (the airframe, that is, not mine!) and then get it back together.
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Old Feb 24, 2013, 02:07 PM
...missing the PE Slope Rebels
Flying Beagle's Avatar
United States, MI, Manchester
Joined May 2004
3,062 Posts
My complete build thread: http://www.rcgroups.com/forums/showthread.php?t=382003
Wing span 44 in. ..................................Wing area 319 sq. in.
AUW: 26 3/8 oz .....................................Wing Loading: 12 oz./sq. ft.
Covering: Yellow Solite, Red Solite, Metallic Platinum Monokote
Motor: AXI 2808/24 ...................ESC: CC Phx 25...............Battery: ThunderPower 3S 2100
Rx: Electron 6 .......................Aileron Servo: HS-81 ..............Rudder & Elevator: HS-55ís
Flown: Jul-2005
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