Dark Horse - Helicopter Power & Setup Calculator

Battery Pack:		mAh capacity\| :g of AUWeight
Main Gear Teeth:		V \| Full Flat
Motor Pinion:	:1	Amps avg. (est. your hover)
Motor RPM/V:	Kv	Watts avg\| :Watts/kg of mass
Efficiency/throttle:		minutes runtime max avg.
Motor RPM:		mm rotor \| :kg/m^2 hover disk loading
Rotor RPM:		MPH / KMH tip speed
Try the Advanced Calculator prototype		MPH / KMH max FF	Try the Advanced Calculator prototype

Quick reference guide v1.0b

\|	Snap in stock values	Modified	Gear	RPM	Weigh/g	Rotor mm	Amps	Data source	\|	Snap in stock values	Modified	Gear	RPM	Weigh/g	Rotor mm	Amps	Data source	\|
			120	3500	200	330	5.0	thread1 thread2				150	2800	700	700	12.0	forum site
			180	2600	360	560	5.2	thread1 thread2				110	2000	1575	1060	17.0	thread
			110	2500	375	620	4.8	thread				180	2000	1800	1040	18.0	thread
			140	2100	300	527	3.6	thread				170	2000	3050	1350	30.0
			140	2500	410	550	6.0	thread				96	2000	1600	1200	20.0
			140	2500	385	556	6.0	thread
	---------------------------------------------------------											Custom memory presets
			96	1400	220	500	2.5	thread

Spawn New Calculator

- Internet Explorer must 'allow blocked content' to use calculator scripts. Looks, runs miles faster and better in Opera9 or Mozilla Firefox browser.

- Launch 2 versions of the calculator page to easier compare setups.

- Things to be taken into consideration when assessing the calculator results:
Whether you aim for RPM at zero pitch or at hover pitch loading (at what flying weight?)
How accurate is the motor kv (rpm/v) rating, eg. some justgofly winds seem to vary.
Operational battery voltage under load, so try out the middle three radio buttons (pack voltage) for a better guide range.
The actual efficiency of the motor and other drag factors such as gear mesh and blade profile drag.

- Some text fields can be typed into and auto update when clicked, tab'd away or just press return.

- Edit the average Amp consumption rate to estimate maximum battery pack runtime.

- Alternatively, if you know your setup's flight time when hovering then enter the number on mins and calculate back the average Amp draw (if 100% capacity could be used).

- Note that you can shift the pack voltage with the radio buttons, just a guide to Amp draw ranges, not for true runtime calculations as there is no way to correspond a pack voltage to remaining capacity under unknown loads.

- 'Efficiency/throttle' means you can use the drop % as a throttle if you wish but remember to drop at least 10 to 20% for real world losses. 90% is about the best zero load performance your going to ever see. Note that ESC's throttle % are not normally as linear.

Formula:

Rotor RPM = (Motor RPM/V * Battery Voltage) / (Main gear Teeth / Pinion Gear Teeth) * (% Efficiency /100)
Runtime max without losses = (Battery Capacity Ahrs) / (Amps average) * (60 mins)
Or Amps average = (Battery Capacity Ahrs) / (Runtime) * (60 mins)

- There are 3 custom memory slots to save and restore custom model setups into your browser's cookies. Makes it easier to compare custom setups with one click and save model setups for another day (valid until the year 2022). There may be other malfunctions that crop up as old data is restored on a future modified web page, so may look odd. If this happens refresh the page and overwrite the old saved data with the newer format. Or try using one of the older versions.