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Archive for the ‘11.1 V Lipo’ Category

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











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