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Dic
29

Ardupod scratch built hexapod squat and rotate code using analogue joystick

analogue, arduino mega, hexapod, scratch build Commenti disabilitati su Ardupod scratch built hexapod squat and rotate code using analogue joystick 

Round variant much simpler made fro two plastic plates



Ardupod scratch built hexapod squat and rotate code using analogue joystick




Ago
24

Marinize an aero ESC with a TicTac box some epoxy Aluminium tube and hot glue

catamaran, esc, jet drive, marine, scratch build, tunnel hull Commenti disabilitati su Marinize an aero ESC with a TicTac box some epoxy Aluminium tube and hot glue 

Marinize an aero ESC with a TicTac box some epoxy Aluminium tube and hot glue

Hobbyking SS Series 60-70A ESC




The Hobbyking SS series comes with a limited range of programming functions and are designed to be plug-n-play.
A perfect ESC for those looking for something simple to use and economic.

Spec.
Weight: 63g
Size: 55x35x8mm
Cells: 12-24Ni MH ~ 4-8S Li Po
Max Current: 60A
Burst : 70A
No BEC
Timing: 1/7/15/30 programmable
PWM: 8/16K
Features.
Constant current 60A Max 70A
Li-Poly 4-8 cells
Low Resistant 0.0017 Ohms;
Dynamic Braking
BEC: opto
Auto shut down when lose signal
Slow down at 3.0V per cell Lipo, Cut-off at 2.9V per cell Lipo 0.8V NiMh
User Programming options.Battery setting
Throttle Range
Brake setting 4 options: Direction and Cutoff Type
Timing Mode Setting: 1 / 7 / 15 / 30
PWM setting: 8K/16K

Marinize an aero ESC with a TicTac box some epoxy Aluminium tube and hot glue. A nice water tank directly on the heatsink over the FET's lots of volume flow seems more than adequate  Its epoxied on with hot glue over that to seal any holes.


My plan is to use this ESC on theis motor





It don't have much specification on HK's site but my understanding is it a 
2185KV 28mm diameter ,33mm length with a 3.17mm shaft weight 230g  I got the 32 mm prop too.


Looks like a nice quality device seems to have great reviews on HK's site


 Its air tight and if it get hot enough to melt the hot glue its probably toast in any case



Lug
30

Time for a full size scratch build 9 foot catamaran runabout

catamaran, runabout, scratch build, tunnel hull Commenti disabilitati su Time for a full size scratch build 9 foot catamaran runabout 


A recent purchase of a 5hp Mercury as a wing engine for Buttercup has re-kindled my desire to build a runabout catamaran design I have had in mind for a while now.


9 ft long by 4ft 6" beam in thin ply just to hold the shape then fiberglass sheathed on the outside and a full layup in side. 



The above mockup has been around now a couple of years. A feature of the design is two of the bottom panels have one completely straight edge.
I have a 4 foot mockup in the same proportions 2:1 length to beam with the hulls an tunnel one third of the beam.  The tunnel should make the hull very stiff longitudinally, and a bulkhead one third of the length near the bow make the cardboard mock up very stiff torsionally. 





Mar
10

New Baby Twin Boom 700mm Bumble Plane

400 grams, duck tape, scratch build Commenti disabilitati su New Baby Twin Boom 700mm Bumble Plane 

New Baby Twin Boom 700mm Bumble Plane

Maiden Flight Here

With any luck will give it a flight in Akaroa tomorrow




Foam Board, hot glue and tape
Span 700 mm
Length 730 mm
Flight weight 385 Grams
C20 1550kv motor 
6X4 APC prop delivers 385 Grams of thrust @ 9.7 Amps
Turnigy nano-tech 460mah 3S 25~40C Lipo Pack 45 Grams

2 X 2.5 gram servos 
Hobbyking SS Series 8-10A ESC

The tape weighs 15 Grams and add so much durability in a crash



The wing is a 200 mm chord with a 10 mm under camber shown above. It has a single aileron and elevator.

Wing Area: 14 dm²    1.5 ft²
Wing loading: 28.57 g/dm²    9.37 oz/ft²









Mar
09

Old Fogey Coupé

foam board, old foggy, scratch build Commenti disabilitati su Old Fogey Coupé 





Dropped the wing removed some of the lower fuse that was damaged in a bad landing. Lost 50 grams in the process and the wheels which are no good at our field.



The angle of incidence remains the same as the plans. I'm hoping  the lowering of the wing relative to the thrust line will reduce the nose up tendency with power.


If the wind ever stops I shall have a fly
Feb
10

Inexpensive picture frames in Foam Board

frame, method, pictures, scratch build Commenti disabilitati su Inexpensive picture frames in Foam Board 

Using plane building methods to build inexpensive picture frames in Foam Board

The other half asked me if I could make her some picture frames from foam board. A 40" X 30" sheet could make 5 like the one below 
which fits a  165 X 200 mm picture.






Feb
04

Old Fogey 2 In Foam

12amp, foam, scratch build Commenti disabilitati su Old Fogey 2 In Foam 

Fogey 2 In Foam


Due to the apparent poor performance of my Coroplast Fogey I have built a foam board one to see if it works better :) It Flys :) Fogey and Piper Cub


All finished
AUW 732 Grams 
1000mAh Zippy Compact
Landing gear
All rubber bands ect ready to fly






My custom power pod














2210N 1000Kv Brushless motor 
Weight: 45g
Shaft: 3mm


Spec.
GWS9050 @3S
Max Amp: 11.2A
RPM/Min: 8700
Thrust: 740g
APC9x3.8 @2S
Max Amp: 6.5A
RPM/Min: 6260
Thrust: 405g






My Thrust Tests with a GWS 10X4.7 slow fly and a 2200mAh 3 cell
3.7 A      45 Watts     303 Grams
7.3 A      86 Watts     480 Grams
9.5 A      111 Watts    550 Grams
13.1 A    150 Watts    655 Grams


HobbyKing 12A BlueSeries Brushless Speed Controller


Spec.
Cont. Current: 12A
Burst Current: 16A/10sec
Battery: 2-4 Cell Lipo / 5-12 Cell Ni-XX
SBEC: 5V/ 1A Output
Size: 22*21*4mm
Weight: 10g










Spec.
Capacity: 1000mAh
Voltage: 3S1P / 3 Cell / 11.1V
Discharge: 25C Constant / 35C Burst
Weight: 82g
Dimensions: 76x15x34mm
Balance Plug: JST-XH
Discharge Plug: XT60
Gen
29

Baby Fogey 50%

foam, nanotech, scratch build, Turnigy Commenti disabilitati su Baby Fogey 50% 

Baby Fogey 50%

Baby Fogey flew on a rare calm day she's a bit to heavy with a 2 cell 500mAh nice wee plane will take her to the indoor flying club another time once I have reduced the mass so its not so fast. Here ars some more 50% Fogey's Indoor Micro Old Fogey



50% Scale of original Flitetest design. EPS foam
AUW Weight 120 Grams

She needs to lose her puppy fat and slim down to 100 Grams
2900kv C10 motor from HK with a 4.1 X 4.1 prop witha  3 cell draws it 5.4 Amps on the test rig for 123 Grams of thrust or 4.4 Oz

The weight can come down with a 3C 180mAh NanoTech 
19 Grams vs 32 Grams for the Zippy above








Gen
14

flitetest.com Old Fogey in Coroplast

24gram motors, coroflute, coroplast, Corriboard, old foggy, scratch build, signboard, slow flyer Commenti disabilitati su 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
Kv1650 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










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

Wing mounted on fuse


Made two 32mm wing sections in foam for the ends of the mid span.
Two sections cut, next time I will cut the profile as one piece then half it :)

Wing profile cut into foam



Wing tips temporarily secured with packing tape for her first photo shoot  
She's a bit shy and isn't showing us her tail yet :)

Like the colour of her dress myself



















Gen
13

Open Source Remote Control Very Cool

arduino, arduino nano, homebrew RC, RC, scratch build, xBee Commenti disabilitati su Open Source Remote Control Very Cool 









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