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Old Jan 20, 2006, 10:36 AM
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EzEd's Avatar
O-Town, FL
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Black Horse Decathalon build

Good day fellow electric flyers. I have begun a build of the Black Horse Decathalon offered by Hobby Lobby.

The kit, upon inspection, looks to be a quick build. However, this is my first glow to electric conversion so I will be taking my sweet time. Besides I haven't got the power plant yet. I have ordered the Hyperion 4020 10 turn along with the front mount. I plan on using the Poly-Quest 4 cell 20C 3700Mah LiPo pack. Not sure yet on the ESC/BEC.
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Last edited by EzEd; Jan 20, 2006 at 10:51 AM.
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Old Jan 20, 2006, 04:04 PM
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Kilsyth, Victoria, Australia
Joined Oct 2003
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This looks identical to my Decathlon sold here in Australia under the Seagull tag. I went a different route to you and used a locally produced 700 watt outrunner off 20 X GP 3300 and a Phoenix 60 esc with a 13 X 8 APC 'E' prop. Despite the cells shoving the weight up to 9lbs the plane is very comfortable to fly, stalls gently straight ahead and still manages ten minute flights. If yours is like mine then it pays to remove those very heavy pushrod tubes at the rear end (two for elevator and one for rudder). Good luck with it though as this is a very nice first time conversion.
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Old Jan 21, 2006, 07:27 AM
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Flight Level 46 X 92
Joined Feb 2002
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I just got a Thunder Tiger Decathlon this week for the same purpose (EP conversion). I'll be watching with interest. Very similar (64" ws, 694 sq in) but different airframe. At least I assume it's a different airframe, we should compare a few internal pics. Need to funish my current CG Cub project before starting on this one though. I'd be interested in your motor choice/options. I am planning on a AXI 2826/12.
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Old Jan 21, 2006, 10:04 AM
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EzEd's Avatar
O-Town, FL
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Gouda,

Your choice for the motor should serve you well provided you will be in the 6 - 7 lbs range. The Hobby Lobby site actually recommends the 2826/10 for my decathalon. I decided on the Hyperion 4020/10 because I like the extra pop and I prefer to fly around half throttle with the extra reserve for aerobatic applications. I would think that using the 2826/10 would put me at the max for that particular motor.

I got the elevator/rudder tail feathers glued in place. I will now have a little bit of a pause in building as I await the motor/esc/bec to arrive. I should have the motor by next Weds(01/25).

This ARF is a very simple build even for me!
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Old Jan 21, 2006, 11:07 AM
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gouda's Avatar
Flight Level 46 X 92
Joined Feb 2002
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I am shooting for no more than 6.5 lbs. I just unpacked the plane to make it sure it was undamaged. I'll weigh all the bits later today. I happened to have the 2826/12, that's why I am using it. If I have it all figured out, I think I can get about the same power out of the /12 by using a slightly smaller prop.
I am doing a CG Cub ARF right now and using a Axi 4120 in that. It's larger, heavier and I plan on adding floats to it so the larger motor will be needed I figure.

You may like to check this thread on RCU out. Same plane as yours:
http://www.rcuniverse.com/forum/m_3607971/tm.htm
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Old Jan 21, 2006, 11:45 AM
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orlando, FL
Joined Mar 2003
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wow, Eddy,

looks like you got alot done allready. You still want to head to the hobby shop later today. I'm waiting on a table delivery but after that comes I'll be heading to graves. I'll give you a call later.



PS isn't this a build thread, instead of discussion
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Old Jan 25, 2006, 04:22 PM
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orlando, FL
Joined Mar 2003
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I know you got your motor in.....how about posting a picture or 2...



Please
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Old Jan 25, 2006, 05:48 PM
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EzEd's Avatar
O-Town, FL
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Quote:
Originally Posted by dogon1013
I know you got your motor in.....how about posting a picture or 2...



Please
Alrighty then Toby.
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Old Jan 25, 2006, 05:54 PM
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Telford, UK
Joined Feb 2000
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Hi All!

I converted the Seagull variant last year. An AXI 4120/18 and 16xGP3300 cells brought the weight up to 9lb, but the big Dec flew beautifully.

There's a build thread here;

http://www.rcgroups.com/forums/showthread.php?t=336965

Just watch out for all those metal to metal joints at the inner ends of the struts, OK?

tim
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Old Jan 31, 2006, 05:58 PM
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O-Town, FL
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Well, bummer. The Hyperion front mount I bought for the 4020 will not work with the model. The thrust line is high on the firewall and the mount sort of flares at the mounting points and is outside the top of the firewall. I'm gonna have to go with the rear mount and flip the motor.
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Old Feb 13, 2006, 07:29 PM
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orlando, FL
Joined Mar 2003
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Eddy,

I finished those spacers for your motor mount. I made them 12mm so you shouldn't need those washers.

i don't think i will be able to fly tomorrow after work though, but Wednesday's winds look OK.
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Old Feb 15, 2006, 06:16 PM
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EzEd's Avatar
O-Town, FL
Joined Jun 2003
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Well, got the motor mounted with the Hyperion backmount set and dang, the small length of the motor would not get out far enough for the cowling. Thus, Toby had to fashion the spacers noted in his previous post. Thanks Toby!

Here are a couple of shots of the motor partially mounted.
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Old Feb 28, 2006, 07:20 AM
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O-Town, FL
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Got a few more items completed last night. Its about 97% done. Only one more thing to do and that is to mount the battery somewhere. The deck behind the motor may not work due to CG issues.
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Old Feb 28, 2006, 08:54 AM
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gouda's Avatar
Flight Level 46 X 92
Joined Feb 2002
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FYI, I upgraded from the 2826 to a E-Flite Power 45. I think it will work out better than the smaller AXI, since likely the plane will come out heavier than what I expect. Isn't that always the case?
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Old Feb 28, 2006, 01:03 PM
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EzEd's Avatar
O-Town, FL
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Quote:
Originally Posted by gouda
FYI, I upgraded from the 2826 to a E-Flite Power 45. I think it will work out better than the smaller AXI, since likely the plane will come out heavier than what I expect. Isn't that always the case?
I think you'll like that choice. I've always thought that the 2826 would work but it would be at its max performance envelope.
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