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Old Jan 08, 2013, 12:48 AM
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Transall C-160 build log

Will be using Spektrum 8 channel receiver and my DX-8i tx
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Old Jan 08, 2013, 11:44 AM
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Marshall Islands, Enewetak Atoll
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Transall C-160 build log

Some versions of this kit have been weighing in at more than 8 lbs which seems hard to believe when I weigh the components. Hobbyking shows that the flying weight is 2600g max (5.73 lbs) That seems be closer to what I'm finding:

Wing with servo, motor, esc, nacelle, and wiring installed: 1lb 2 oz x 2 = 2 lb 4 oz
Fuselage: 2lb 3 oz
Elevators and rudder: 3.3 oz
Landing gear assembly with wheels: 5.8 oz
Wing spar & elevator/rudder control rods: 3.7 oz
Nuts & bolts in kit left to install: 2 oz

Sub total: 5lbs 5.5oz

That does not include the radio receiver or battery.

Radio receiver: 0.5 oz
5000 mah 3 cell battery: 1lb 1 oz

Grand total: 6lbs 4.3 oz
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Last edited by ecworks; Jan 08, 2013 at 12:56 PM.
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Old Jan 08, 2013, 02:13 PM
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Marshall Islands, Enewetak Atoll
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The wing loading does look like a problem.

Transall C-160 with stock wing:
Wing area: 317 sq. inches
Weight: 110 oz
Wing loading: 49.88 oz/sq. ft.


Using Twinstar II wing:
Wing area: 476 sq. inches
Weight: 110 oz
33.27 oz/sq. ft.

Typical wing loading:
Glider: 10 oz/sq. ft.
Trainers: 15 oz/sq. ft.
Sport plane: 20 oz/sq. ft.
Fighters: 25 oz/sq. ft.
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Old Jan 08, 2013, 07:07 PM
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Marshall Islands, Enewetak Atoll
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Transall C-160 build log

I've got one of the stock Transall wings setup but the wing loading issue has me worried so I'm setting up an alternative wing, a Twinstar II which is has 50% more wing area and looks like it will be an easy fit with minimum alterations. Even so this will be a 7lb bird so I'm going to cut in some flaps.
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Last edited by ecworks; Jan 14, 2013 at 12:03 PM.
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Old Jan 08, 2013, 07:08 PM
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Marshall Islands, Enewetak Atoll
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Slowed down the speed of the flap servo thru the DX-8i:

Transall C-160 build with Twinstar Wing w/flaps flap test (0 min 14 sec)
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Old Jan 08, 2013, 11:15 PM
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Marshall Islands, Enewetak Atoll
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Transall C-160 build log

Painting the Twinstar II wing to work with the C-160 paint scheme:
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Old Jan 09, 2013, 02:22 AM
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Marshall Islands, Enewetak Atoll
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Transall C-160 build log

Twinstar II wing on the Transall (mockup)
It's just sitting there, the angle of incidence not correct of course.
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Old Jan 09, 2013, 12:51 PM
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I order to mount the Twinstar II wing I'll need to fab a wood mounting board/saddle that will bolt in the normal wing mounting holes but will have its own mounting holes that will line up with the standard Twinstar wing mount holes. This way I can switch wings fairly easily.
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Old Jan 10, 2013, 10:23 AM
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Marshall Islands, Enewetak Atoll
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Transall C-160 build log

Stock wing/Twinstar wing comparison
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Old Jan 10, 2013, 12:39 PM
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Transall C-160 build log

Stock wing epoxied together, rubber grommets wiring holes.
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Old Jan 10, 2013, 04:09 PM
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Transall C-160 build log

Stock wing wired, motored, and installed.
Wood horn in center of wing fits into a wood saddle in the fuselage holding the front of wing in place, two allen screws take care of the rear.
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Old Jan 11, 2013, 12:48 AM
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Transall C-160 build log

Worked on the attachment for the Twinstar II wing. Cut out a plywood deck that temporarily screws into the stock wing mount saddle using blind nuts
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Old Jan 11, 2013, 12:51 AM
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Transall C-160 build log

Then I used the plastic hold-down straps that comes with the Twinstar but instead of using the center hole and nylon bolt I drilled holes on either side. Then I marked and drilled holes in the plywood deck where these bolts came thru and then installed blind nuts on the underside of the plywood deck to receive the bolts coming thru the Twinstar wing.
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Old Jan 11, 2013, 12:53 AM
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Marshall Islands, Enewetak Atoll
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Transall C-160 build log

Using the Twinstar strap mounts bolting to the temporary plywood deck seems to work great. It feels super strong and can unbolt and remove in a few minutes to transport or to change to the stock wing. You gain about 50% more wing area.
The angle of incidence seems to be the same as the Twinstar and a little more positive than the stock Transall wing.
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Last edited by ecworks; Jan 13, 2013 at 02:11 PM.
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Old Jan 11, 2013, 12:55 AM
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Marshall Islands, Enewetak Atoll
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Transall C-160 build log

Motor test (Eflight Park 480's 1020 kv) with 4-blade props (9x6)

Transall C-160 build motor test w/4 blade props (9x6) (0 min 21 sec)
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Last edited by ecworks; Jan 11, 2013 at 01:34 AM.
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