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Archive for the ‘scratch built’ Category

Dec
18

Yellow Boat 3

100A ESC, 2100kv heli motor, 50 amp, coroplast, scratch built, signboard, yellow boat Comments Off on Yellow Boat 3

The hull is 4 inches longer than Yellow Boat 1 the keel is fiberglass and epoxy as are the chines, everywhere else its hot glue. Much cleaner hull then the earlier boats but still a bit ugly.

These hulls are tough as, run them into rocks do what you like they just flex. I suppose they would fail at the seams when they do, that's why I glassed in the keel.The hull is all one piece of Coroplast split in the front sections and glued. I scored the folds with a ball point pen so they bend correctly, getting better with the material now.

Scratch Built 30mm Jet Pump Pump Detail

The ride plate is glassed in on the inside so its really stiff, as the pump is all outboard I have recessed the transom to hide it away a bit. Its a big jet unit.

Room for 2 X 11.1V 2200mAh 20C batteries in parallel should deliver up to 80 + Amps
The cooling system is here

Turnigy 450 H2218 Brushless outrunner 2100KV with water cooling added, big bore pipes just because that the brass I had in stock.

Spec.
Model: 2218
Turns: 6
Cells: 2~4S
Kv: 2100rpm/V
No load Current: 1.9A/10V
Max power: 500W
Weight: 67g
Shaft diameter: 3.17mm
Dimensions: 27.2 x 36.5mm
Recomended ESC: 2~4S/50A

Dragster exhausts :) for the cooling water I have fashioned a pump from some old junk which can bee seen here

Hobbyking SS Series 90-100A ESC with a water cooling plate added its an overrated ESC so should do the job easy. Will need a BEC I have a 5A in stock also.

Spec.
Weight: 85g
Size: 70x50x13mm
Cells: 2-7S Li Po
Max Current: 90A [over 70A use 6S only]
Burst : 100A
No BEC

The Cooling System Pump

A real yellow boat

Dec
13

Yellow Plane 2 Near Completion

coroflute, coroplast, Corriboard, FPV, scratch built, twinboard Comments Off on Yellow Plane 2 Near Completion

Yellow Plane 2 Near Completion

Wing Loading 15 oz/ft²

Motor Power 410 W

Power/Mass 267 Watts/Kg

Fuselage Mass 1040 mm

Wing Span 1200 mm

Wing Chord 280 mm

Take off Mass 1536 Grams

Nov
22

Found out why the maiden flight ended with Issac Newton attacking my plane

FPV, lipo, lipoly, maiden, maiden flight, scratch built, speed weight, throttle, Turnigy, Turnigy Accucel-6 50W 6A Balancer/Charger, yellow plane Comments Off on Found out why the maiden flight ended with Issac Newton attacking my plane

Found out why the maiden flight ended with Issac Newton attacking my plane. The pilot said it seemed to loose power as she turned into the wind, and he was flat out for whole flight due to the excessive weight of all that Corriboard, I have a lighter air frame in the works 1300 Grams wing loading 12.53 oz/ft², 250 Watts per Kilo Please see the spreadsheet. I think its highly likely she just ran out of juice?

This is why I suspect the battery state

Turnigy Accucel-6 50W 6A Balancer/Charger

Spec.
Input Voltage: 11~17v
Circuit power: Max Charge: 50W / Max Discharge: 5W
Charge Current Range: .1~6.0A
Ni-MH/NiCd cells: 1~15
Li-ion/Poly cells: 1~6
Pb battery voltage: 2~20v

Some how or other my charger was set to a max CAPA of 200mAh so my batteries were never charged. My wife helpfully pointed out that I should have read the manual (Here is the manual) but that just isn't the bloke way, why do girls not get that?

Maiden flight of Yellow Plane flown by a local pilot Richard to avoid instant crash I would cause. A little tail heavy but flew pretty well on a gusty day, I'm told control was good. Ended in a crash but not too badly damaged, learned a lot. I'm just chuffed if flew looks pretty good on such a windy, which is pretty standard for the south island this time of year.

My scratch built FPV platform. Took around 30 hours to build mostly Corriboard with some ply, aluminium and carbon fiber spars. Total material cost around 50 US$. Got a DT700 (see tests data here) which hopefully will be an adequate power source. Its a modular design based around an armature, so wings and tail etc are bolted on and can be exchanged for testing parts and ideas. Have a pair of KM3 wings and the Corriboard ones shown below.

Please see the spread sheet here Yellow Plane Data

More Links
The RX Build
Power Tests
More Test Data
Xbee's and Arduinos
Controller using Tiny CLR
Xbee Helpers

Based around a stiff wooden armature and two aluminium tail spars the wings are removable for transportation. According to my calculations the wing loading is 15.5 Oz/Ft² at a flight weight of 1700 Grams. A glass fiber nose has been molded and is curing now which is around 80 grams, which will contain the FPV gear and the main battery.

Home brew Arduino Xbee remote control