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Archive for the ‘2200mah’ Category

Dic
19

Its only a tiny water Pump but Its got an enormous flow

100A ESC, 2100kv heli motor, 2200mah, 6C, water cooling, water pump Commenti disabilitati su Its only a tiny water Pump but Its got an enormous flow 

Its only a tiny water Pump but Its got an enormous flow. Cooling pump for Yellow Boat 3 COuld be a candidate for a temperature sensor and current sensor to control the pump with a trusty Arduino nano. The pump motor draws 100mA on load.
Testing YB3 in the bath its totally mental on 6 cells 569 Watts flat out nearly emptied the bath should be amusing on the lake, that said at this power level it needs the motor cooling
Its made from an old servo motor motor a small brass impeller made from sheet brass and brass tube, soldered onto the pinion. The pinion is then secured with Locktight to the motor shaft. The shaft seal is from a non drip honey bottle glued on the end of the motor.The pump body is a part out of the top of a pump bottle soap dispenser, all held together with epoxy and Fiberglass.

The little pump shifts plenty of flow though the big pipes motor first them ESC a power test will be run to evaluate the performance of the cooling system, it seems to prime its self Ok. There is a rectangular scoop on the outside of the hull to help the flow when the boat is traveling. Having a pump means the temp won't overshoot after a fast run and stop like it would if it were only a scoop or tap from the jet unit nozzel.

Another tiny pump probably much more expensive than mine

http://www.simplypumps.com/miniaturepumps-pictures.htm






Nov
19

Prop Better than the EDF 90mm

11.1 V Lipo, 2200mah, 3C, 880 Grams thrust, Turnigy L2210-1650 Commenti disabilitati su Prop Better than the EDF 90mm 


Tried to fly the wee jet at Akaroa today and it was dismal and under powered :(

Calculation Spread Sheet

So taking some advise from DIY Drones I did some more testing and have found a sweet spot with some props I have laying around.

Turnigy L2210-1650 Bell Style Motor



Spec.
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
Thrust: 520g Weight: 50g










My results with a 7 X 5 three blade are as follows on a 3C


23.6 Amps
11020 RPM
880 Grams Thrust !
240 Watts

That's on a 2200mAh 3C and a Turnigy AE-30A Brushless ESC










I have read that the following formula calculates approximately the max speed of the model

Plane_KMH = Prop_Pitch_Inches X RPM / 800

Given this is correct?

5 X 11020 / 800 = 68.875Kmh

Should give a minimum duration of 5.6 minutes


Using a 4C on a 5 X 5 Three Blade Prop



Next test will be with a 4C and smaller prop, optimized for 250 Watts should be around 16 amps

Tested a 5 X 5 three blade


Rhino 1550mAh 3S 11.1v 30C Lipoly Pack

Thrust:     770 Grams
Watts:      238 Watts
Amps      16.4 Amps
RPM:        14,200 RPM


Plane speed 5 X 14200 / 800 = 88.75 Kmh

Should give a minimum duration of 5.8 minutes

I think either of these options will do the job, the plane weighs 685 grams with a 2200mAh 3C on board, wing loading 18 oz/ft²


Conclusion

Given the 4C is no more efficient and the duration advantage in negligible, and the 4C battery is only 7 Grams lighter, I favor the 3C on the bigger prop. There is a theoretical 20Kmh speed advantage for the 4C but the 3C is plenty fast enough.


The Plane

A mass of 500 or  750 grams give a wing loading's of 13 oz/ft² and 19 oz/ft² respectively
Wing area 1.3855 ft²
Dihedral 5º













Nov
17

Yellow NQD Jet Boat Sumner Surf at high tide jumping clear of the water, going vertical

11.1 V Lipo, 2200mah, AE-30A Brushless ESC, NQD 20mm Jet Drives, surfing Commenti disabilitati su Yellow NQD Jet Boat Sumner Surf at high tide jumping clear of the water, going vertical 


Shore cam
FPV

Surfing
Going vertical
Chasing a wave
Climbing the wave
Over the crest
Rolling






Running along a wave









Nov
16

:) IT FLY’S :) Maiden flight of Yellow Plane Hextronic DT850 Turnigy 2200mAh Xbee Arduino Controller

2200mah, ardruino, fpv plane, maiden flight, XBee Pro 60mW U.FL Connection - Series 1 Commenti disabilitati su :) IT FLY’S :) Maiden flight of Yellow Plane Hextronic DT850 Turnigy 2200mAh Xbee Arduino Controller 

Currently revising the design to reduce weight and have bigger wing chord base on advise from DIYdrones with slightly shorter wings. 

 AUW 1521 Grams Wing loading 14.83 oz/ft²  power to weight 270 Watts per Kg should perform much better than Yellow plane one. 

I'm changing from the D4023-850 Out Runner Motor to a higher kv Turnigy L3010C-1300kv Tests show significant improvement in static thrust 1700 Grams. I also have a Turnigy D3542/4 1450KV in reserve If I need more grunt, got 2 Kgs from this wee beasty on the test rig. 

I ran the  D4023-850 on a Turnigy dlux 30A SBEC but the Turnigy L3010C-1300kv needs more Amps so I have a H-KING 50A Fixed Wing ESC which seems good at full load only gets warm.

Decided on HobbyKing 929MG Metal Gear Servo's which seem like nice devices, I have trashed most of the cheapies I had in various mishaps.  

The Murata Piezo Gyro's are mounted on a dead HobbyKing Multi-Rotor Control Board I acquire the analogue signals from the gyro's with the Arduino Nano and the calculations for the control surface correction are done in there and sent to the servos.

Once the plane is proven I have a 1/3-inch SONY CCD Video Camera (PAL) and 5.8g 200mw FPV Wireless AV Tx & Rx Set for the FPV setup I tested the TX & RX with another camera and they seem to perform more than aquatically. 

Experimenting with material options for the wings looking for a target weight of 400 grams or less for both wings. Please see calculations
Also I have added gyro stabilization which looks good on ground tests.This video on flitetest.com shows a stabilizer in flight.

If any one out there has any helpful advise please feel free to comment/contact? 





I was so pleased to see her fly in the hands of an experienced pilot


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 







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