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Dec 04, 2005, 10:37 AM
Lee
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Build Log

Gobblin inspired by UFOX3 - Planes


This site is specificly for the SX3 links and other ultra light EPP build up X planes. I was trying to describe to a new builder in the club where to find the links and decided this would help. Please add links if you find them.

Here are the origional postings and design.

https://www.rcgroups.com/forums/show...ight=SouthernX

https://www.rcgroups.com/forums/show...ight=SouthernX

https://www.rcgroups.com/forums/show...ight=SouthernX

https://www.rcgroups.com/forums/show...ight=SouthernX

https://www.rcgroups.com/forums/show...66#post1649366

https://www.rcgroups.com/forums/show...ight=SouthernX

New Indestructible 3D plane SouthernX-3 !

http://rcp.web.infoseek.co.jp/rc/Sou...ernX3v4_01.pdf
http://rcp.web.infoseek.co.jp/rc/Sou...ernX3v4_02.pdf
http://rcp.web.infoseek.co.jp/rc/Sou...ernX3v4_03.pdf
http://rcp.web.infoseek.co.jp/rc/Sou...ernX3v4_03.pdf
http://rcp.web.infoseek.co.jp/rc/So...hernX3v4DXF.zip

Final spec.
AXI 2208/34.
Kokam 340H (3 cells).
GWS 9X4.7.
Weight 225g (7.9 oz)

Promotion video!!
http://www.mimei.jp/~r/movie/SouthernX3_PV.wmv
http://www.mimei.jp/~nishiyama/movie/04032410.mpg

Building instructions of the SX2.

http://olive.zero.ad.jp/~zbf10135/rc_SouthernX2e.htm

If you are not motivated enough to build one here is a place to buy a partially built kit.

http://www.funplanes.com/arfs/SX3Arf.htm

Here's the manufacturer's instructions.

https://www.rcgroups.com/forums/show...&page=10&pp=15

.
Last edited by Lee; Mar 29, 2010 at 11:10 PM.
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Feb 24, 2006, 05:43 AM
Lee
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With the inspiration of the SX3 we designed The UFO Gobblin. This is a solid EPP foam plane with 1.3# EPP wings and a 1.9# EPP fuslage.

So far it has gone through many upgrades and testing. It is not even the same plane other than we have kept the same airfoil because it is a pleasue to fly.

Our goals were:
1. A silent plane that could be flown in small local fields without attracting much attention.
2. Has to be wind worthy up to 15 MPH
3. Has to be aerobatic.
4. Has to be entertaining for the advanced flyer.
5. Has to be powered by low-cost motors.
6. Has to be able to go vertical.
7 has to be able to carry a battery big enough that the battery is not over amped with full throttle.
8. Has to fly as well upside down as rightside up.
9. Has to look cool.
10. Has to be strong with out all the reinforcement tape
11. Has to be a durable quick easy to build plane.
12. Designed not to be covered only lightly painted saving weight and building time.


.
Last edited by Lee; Feb 24, 2006 at 02:55 PM.
Mar 03, 2006, 08:46 PM
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Hi Lee ! very nice plane, can I have the plans ?
Mar 03, 2006, 10:27 PM
Lee
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Within the next few days there will be a video posted on the www.utahflyers.org site of the Gobblin flying in the wind. Excellent flying plane. We hope to get plans posted in the near future. Right now it is a prototype plane. It is based on use of the foamcutter and is quite simple to build if you can cut wings.

Total weight for the 36" plane is 11 oz plus the battery.

Lee
Mar 03, 2006, 11:22 PM
Utah Flyers
natetanr's Avatar
Lee im posting some of the videos right now so you should see them by the time you read this. The link says Goblin (sx3) Prototype. Let me know if you want it to say something else.
Mar 04, 2006, 12:09 AM
Lee
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Nate

Just put "Gobblin Prototype" There isn't much SX3 left in it.

Thanks

Lee
Last edited by Lee; Mar 04, 2006 at 01:42 PM.
Mar 24, 2006, 06:30 PM
Lee
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I tried both the AXI 2212/26 and the Axi 2212/34 on the similar Gobblins today.

I used a 10x4.7 on the 26 and an 11x4.7 on the 34.
Both were flown with TP PL 1320/3cells.
I showed 12.2 amps on the 26 and I showed 8.7 amps on the 34.
Both motors flew well and would take the Gobblins vertical.
Both were silent except for prop noise.
The 26 was neutral temp on landing. The 34 was actually cold on landing.
The batteries checked out at 95* on the 26 and 89* on the 34 on my temp monitor.
No question the 26 had more power. The 34 flew longer.

I liked the Axi 2212/26 better on the Gobblins I was flying.
Last edited by Lee; Mar 24, 2006 at 06:42 PM.
Jun 23, 2009, 08:29 AM
Lee
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It's been since Dec 4th 2005 since we built the first Goblins. I guess that isn't that long ago but I had almost forgotten about them when I got a request for an Assassin and a Goblin kit. It made me come looking for the old thread and videos and remember the way things were. The Goblins were only available to the club back then but I think even then we cut only 30 or40 of the old birds. The amazing thing to me is how many of the building techniques and building materials we still use building planes. I find myself having to rediscover the old when building the new. The Shock Absorbing Cord is a good example.



Here are a few more examples of basic foam materials and skills:

I was shooting video even then. Probably because I have halfheimers and wanted to remember the building routine.
1.3 lb EPP wing and 1.9 lb EPP fuselage.
BP21 powered with 25A ESC and 1300 battery
Hot glue assembly
Sanding EPP with EPP
3M77 adhesive spray
Thin CA glue on carbon and baking soda to harden it
Ply motor mount
Foam ailerons and elevator not balsa
soldering gun with wheel color to cut foam
Formica bearings for full floating tail
Carbon in razor blade slit
cutting a hole/slot for the battery and ESC
Reinforced tapes at critical break points
Shock Absorbing cord around the fuselage and later around wing
String inserted into slit with Phillips screwdriver
Top and bottom tape hinges that are ironed down
Horns made of wire tie that are glued not screwed in place.
Glue hinges
H2O Krylon paint
Paint not iron on covering

The funny thing is I still think I have a couple of kits left over but we have no plans to start kitting it again at this time. It could ruin my perfectly bad reputation kitting something with a tail.

Here is the old flying video:
Goblin RC Trainer (3 min 22 sec)


And the old building video:
Building tutorial for EPP RC plane (8 min 46 sec)


Lee
Last edited by Lee; Jul 25, 2010 at 11:46 AM.
Aug 19, 2009, 06:51 PM
Jason
The Gobblin looks like a great plane. I have been wanting a foamie for a while. i think it would be a hit. have enjoyed the pinata. looking to buy the assassin now thank you guys you do alot for the hobby
Sep 26, 2009, 03:38 PM
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Lee,

How did you make the airfoil wing for the Gobblin? I'm starting an Edge 540 build and would like to try an airfoil wing rather than the flat wing the plans call for.

Thanks!
Sep 26, 2009, 04:12 PM
Lee
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Find the foam cutting link here and you will have more information than you even want.

https://www.rcgroups.com/forums/member.php?u=36945
Dec 11, 2009, 10:31 PM
The Tree? Yea I can hit that!
MOUNTAINROAD's Avatar
Lee,
Where is the c.g. on this plane?
Dec 12, 2009, 01:41 AM
Lee
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Quote:
Originally Posted by MOUNTAINROAD
Lee,
Where is the c.g. on this plane?
I sold the rest of the kits I had for the Goblin a few months ago and have given away the ones I was flying to make room for more designs. As I remember the CG is at 30% back on the wing. If you keep it light and don't overpower it it is a great plane.

The fuselage was a little soft in the planes shown on the thread and we stiffened them with carbon rod and a foam horizontal fuse parts like are popular now on the 3D planes. We lengthened the nose 2" to help get the CG forward due to the added weight to strengthen the fuse.
Dec 12, 2009, 12:23 PM
The Tree? Yea I can hit that!
MOUNTAINROAD's Avatar
How do I tell if my goblin has the longer nose, and if it does do I put the wing 5 or 7" back from the nose, I belive your video says 5" if I remember right
Dec 12, 2009, 12:26 PM
Lee
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The fuselage is the same length it is just where you (the builder) put the wing. Set it back a little farther to help compensate for the CG. 3D planes have to be light and you fly as well with the torque of the high power motors but fly better with the lower speeds of the low kv and larger props.


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