Glow to Electric Conversion – Calcs

GLOW TO ELECTRIC


Glow to Electric Conversion calculator


Glow to Electric Conversion Power System Calculator

Step 1: Determine Weight Goal

The target weight should be determined using the Wing surface area, and the desired loading based on thetype of aircraft.

Wing Loading
LoadingType
10 oz/sq.ftGlider
15 oz/sq.ftTrainers
20 oz/sq.ftSport Plane
25 oz/sq.ftFighters
Aircraft Wing Areasq. inches
Desired Wing Loadingoz/sq.ft
Weight Goaloz
pounds

Step 2: Determine Power Goal

The next step is to determine the desired performance level. There is a rule of thumb we use for thiscalled “watts per pound”. The basic idea is that the general performance characteristics of a modelcan be predicted as follows:

Performance Level
Watts per poundPerformance Potential
< 50 watts per poundUnable to rise off ground
50 to 60 watts per poundCan rise off ground and perform simple aerobatics
60-75 watts per poundEasily loops from level flight. More impressive aerobatic performance.
75-100 watts per pound“Fighter”-like performance. Aggressive climbs
100-150 watts per poundExtended vertical runs. Unlimited aerobatics
> 150 watts per poundWings are unnecessary
Desired watts per poundwatts per pound
Â
Power Goalwatts

Step 3: Determine Current (amps) Goal

The next step is to determine the desired current draw. This is done based on the battery cell capacity,and the desired duration:

Note: This calculator does not attempt to determine if the target current is appropriate foryour desired electric motor.
Planned cell typeChoose one 500AR 600AE 800AR 1000SCR 1400SCR 1700SCR 2000SCR
Desired full-throttle durationminutes
Â
Current Goalamps

Step 4: Calculated required number of battery cells

This number of battery cells required is determined based on the Power Goal and the Current Goal. Volts = watts / amps.Each cell effectively provides approximately 1 volt, so we need 1 cell per needed volt. Based on the number of cells,we can also determine the approximate weight of the battery pack:

Required number of battery cellsbattery cells
Battery pack weightoz.

Final Step: Calculate target weight of aircraft without battery packs

Now we can determine how much the aircraft should weight without the battery packs. This should be veryclose to the weight of the glow-powered aircraft.

Target weight without battery packoz
pounds

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