Mitchmoo5000
Member
Kobold (FT Goblin with a Tail)
Flight Videos:
-Kobold Flight Video (Very windy day, it's worth a watch to see the Kobold almost take a swim around 1:20)
-Kobold Flight Video 2 (Another very windy day, but more consistent wind so the Kobold flies much smoother)
-Kobold 140% Flight Video
Build Plans:
Wingspan: 30 inches
Length: 28 inches
The Kobald is simply an FT Goblin with the fuselage extended 9 inches out to allow room for a Conventional Tail or a V-Tail. To build the Kobold, download and build the normal Goblin plans. When building, use the External Fuselage and Fuselage Bottom from my plans linked below. Once you build the modified version of the external fuselage and fuselage bottom you can choose what type of tail you’d like. You can use the conventional style tail (FT Tiny Trainer Vertical and Horizontal Stabilizers) or go with the V-Tail (FT Sparrow V-Tail). You will need to cut the top of the fuselage to make room for whatever type of tail you choose. When test flying I have used the stock CG from the Goblin and it flies great. I was able to get the CG right with a 4s 1300mah battery as far forward as possible in the fuselage. In the model shown above, I mounted the servo internally with just the control horn sticking out. This works fine and looks good, but you could just mount the servo on the top or side for easier access and adjustments.
On my build, I used two 1507 Motors and 3D Printed Mounts. The motors are each 2 ¾ inches from the fuselage to the center of the motor, which allows room for 4-inch prop clearance. If you wanted to run bigger motors with bigger props, just move the motors out a bit more.
Motor Mounts from above. I used the lines on the plans for the servos to align the motors. (Excuse the nose damage. The plane got away from me in the wind and I haven’t had time to build another nose)
Pic of the Motor Mounts. The two 30amp ESC are wired to a power distribution board with bec inside the fuselage.
Battery Placement
V-Tail Prototype
Kobold 140%
Length: 35.5 inches
Wingspan: 41 inches
The Kobold 140 builds exactly the same as the 100% version. The only thing to note when building is that the plans are scaled up to 140%, so this means that the cutouts for the A folds and B folds are larger than they need to be. This wasn’t an issue for me when building, I just took extra time to ensure all of the A and B Folds had an adequate amount of glue and were properly aligned and all was good. The maiden on the 140% went great. It needed a 3600 4s battery to hit the stock cg markings and it flew great. You could also use a smaller battery and add your fpv gear up front.
Note: I have not built the V-tailed version of the 140% yet. Until I build one, I'd assume it would be fine since the 100% version worked, but haven't confirmed this.
Note: The 140% wings do not fully fit on DTFB. I cut it out as shown in this pic
another option.... haven't put electronics in this version yet but will update the article with I do.
Flight Videos:
-Kobold Flight Video (Very windy day, it's worth a watch to see the Kobold almost take a swim around 1:20)
-Kobold Flight Video 2 (Another very windy day, but more consistent wind so the Kobold flies much smoother)
-Kobold 140% Flight Video
Build Plans:
- Goblin Plans
- Kobold Planshttps://drive.google.com/file/d/12_FgjkEu_XRW3oamybs_sCslzINy16E_/view?usp=sharing
- Goblin Fuselage 140% Plans
- Goblin Wings 140% Plans
- Kobold 140% Plans
Wingspan: 30 inches
Length: 28 inches
The Kobald is simply an FT Goblin with the fuselage extended 9 inches out to allow room for a Conventional Tail or a V-Tail. To build the Kobold, download and build the normal Goblin plans. When building, use the External Fuselage and Fuselage Bottom from my plans linked below. Once you build the modified version of the external fuselage and fuselage bottom you can choose what type of tail you’d like. You can use the conventional style tail (FT Tiny Trainer Vertical and Horizontal Stabilizers) or go with the V-Tail (FT Sparrow V-Tail). You will need to cut the top of the fuselage to make room for whatever type of tail you choose. When test flying I have used the stock CG from the Goblin and it flies great. I was able to get the CG right with a 4s 1300mah battery as far forward as possible in the fuselage. In the model shown above, I mounted the servo internally with just the control horn sticking out. This works fine and looks good, but you could just mount the servo on the top or side for easier access and adjustments.
On my build, I used two 1507 Motors and 3D Printed Mounts. The motors are each 2 ¾ inches from the fuselage to the center of the motor, which allows room for 4-inch prop clearance. If you wanted to run bigger motors with bigger props, just move the motors out a bit more.
Motor Mounts from above. I used the lines on the plans for the servos to align the motors. (Excuse the nose damage. The plane got away from me in the wind and I haven’t had time to build another nose)
Pic of the Motor Mounts. The two 30amp ESC are wired to a power distribution board with bec inside the fuselage.
Battery Placement
V-Tail Prototype
Kobold 140%
Length: 35.5 inches
Wingspan: 41 inches
The Kobold 140 builds exactly the same as the 100% version. The only thing to note when building is that the plans are scaled up to 140%, so this means that the cutouts for the A folds and B folds are larger than they need to be. This wasn’t an issue for me when building, I just took extra time to ensure all of the A and B Folds had an adequate amount of glue and were properly aligned and all was good. The maiden on the 140% went great. It needed a 3600 4s battery to hit the stock cg markings and it flew great. You could also use a smaller battery and add your fpv gear up front.
Note: I have not built the V-tailed version of the 140% yet. Until I build one, I'd assume it would be fine since the 100% version worked, but haven't confirmed this.
Note: The 140% wings do not fully fit on DTFB. I cut it out as shown in this pic
another option.... haven't put electronics in this version yet but will update the article with I do.
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