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Jan
14

flitetest.com Old Fogey in Coroplast

24gram motors, coroflute, coroplast, Corriboard, old foggy, scratch build, signboard, slow flyer Comments Off on flitetest.com Old Fogey in Coroplast

flitetest.com Old Fogey in Coroplast

Some tail heavy flying quite a hairy flight the CG was set as specified on the plans. The next flight was much better with the CG set at the wing leading edge unfortunately no video from that flight the camera went missing near the end of the session in the grass somewhere :(

New Indoor 50% Fogey

This video shows piloting using the bad method. The Coroplast held up well (which is why I love it so) with the pretty hard impact failed on the foam to Coroplast interfaces which it what I hoped would happen when I flew it into the ground at mach 1

Its all fixed now and ready for a calmer day as I was una ble to figth the wind, she just climbed with every gust of our patented New Zealand summer wind

Testing today I found I don't have enough thrust to roll on our course grass at the field.Hand launching in our typically wind weather this time of year she flew but had very little power in reserve.

More power :0

Turnigy L2210 250 Watt with an APC 8 X 4 prop which seemed like the sweet spot. I am re-using a Turnigy dlux 30A ESC nice smooth controller.

Turnigy L2210-1650 Bell Style Motor

Kv: 1650 rpm/vVoltage:7.4~11.1v (2~3s)No load Current: 1.3AMax Current: 22AMax Power: 250W

Shaft Size : 3mm

Shaft Length: 28mm

Dimension: 28mm x 17mm

Weight: 50g

Turnigy L2210 250 Watt with an APC 8 X 4 prop

The motor prop maps as follows.

Current Power Thrust

5A 57 Watts 300 Grams

10A 114 Watts 547 Grams

16A 172 Watts 730 Grams

28A 276 Watts 1020 Grams Over current by 6 amps so no full throttle.

Should be able to fly level at 10 amps or less will be running a 1000mAh 3C

Capacity: 1000mAh
Voltage: 3S1P / 3 Cell / 11.1V
Discharge: 35C Constant / 45C Burst
Weight: 92g (including wire, plug & case)
Dimensions: 76x35x17mm
Balance Plug: JST-XH
Discharge Plug: XT60

The Turnigy L2210 1650kv should solve the problem for another 26 Grams well forward, and I get double the thrust. I still needed to move the GC forward with the 24 Gram so the bigger 50 Gram motor solves that without adding ballast.

Hextronic 24 Gram 1700kv not enough grunt on test today, won't roll on my flying field.

Servos mounted externally

Underside wing detail

Foam joints to set tip angle whole wing weighs 215 Grams

center section is 500 mm tips as the plan

Wing detail braced front and rear with Carbon tubes 16 grams

HK i86 gyro board

I put a hatch over the empty chamber in the nose as the CG is stubbornly to far back

Progressing mounted the servos on the outside so they are accessible. Now with a yellow rail fin with Bamboo spars, still nice and light.

Motor mounted and made a hatch over foam nose structure for the RX and any other bits. The ESC will be on the bulkhead in the air flow

The 610mAh battery is mounted well forward with Velcro to get the CG forward, the CG seem stubbornly to far aft will probably need some balance or a 1000mAh 3C to balance her out.

My glue less Coroplast and 25mm thick extruded Polystyrene foam construction using high strength double sided tape and Bamboo skewers

Currently the air frame weighs 376 Grams bare, not servos, radio, motor or battery.

First use a Pritt Stick to fix the plans to the inside and cut round with a sharp knife. I glued along the lines on the plan only so I could get the paper off.

I used the blunt end of my steel rule to crease the flutes where all bend lines are on the plan

Then I removed the plan paper before the glue was fully dry which makes it easier to get off.

This is the outside surface

Make a renforceing foam core to fit inside the tail section so you don't have to glue the corners, used double sided tape on 3 sides of the foam core.

Looking aft from the nose and top view with sides folded up

Adding the fron bulk head. This peice makes the whole fuse pretty stiff torsionally along its length. Th nice feature of Coro and double sided tape is it fails at the tape joint in a crash.

Front bulkhead in position at right angles and flush with the ben of the bottom section. The bulkhead is 100 mm high and in my case 64mm wide

Note the coroplast want to bend along the middle of a flute so the width you get will corespond to the pitch of the flutes in the Coroplast used.

Front bulkhead with a line at 55 mm from the bottom

From the top

Cut a 55mm piece of foam for behind the screen upto the leading edge

55 X 64 mm

Fixed and chamfered to accept the wing section

Now an 80mm piece for the motor mount. This will be re-enforced further with wood for the motor fixings, and may be the only glued part on the fuselage

I mounted the 80mm section flush with the fron of the topand pegged it with Bamboo. This whole structure add lots of strength to the structure, for very little weight

On the scales

The whole fuselage weighs 115 grams around 15 grams lighter than in the calcs sheet predicted.

Tail fin cut to the pattern and rudder hinge crease made, no hinge required

Added a 40 mm flat for inside the foam in the tail. The fin has a couple of Bamboo skewers up it for stiffness :)

Foam center block on wing center section. I rationalized the center span to 500mm as it turned out to be some odd number of mm being 18 inches and I am building in Napoleon units