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User Product Reviews - Watt's Up RC Watt Meter & Power Analyzer - Here is the review of: "Watt's Up" RC ...
The "Watt's Up" RC battery Watt meter measures and calculates all the electrical parameters you need to get high performance from your R/C cars or planes. It is essential for increasing the performance and safety of your electric-powered R/C model.
Marketplace - Watts Up 100 Electric Glider Short Kit - 100 inch Class competition/sport glider designed by Brian Austin and Ray Pavely uses the MH32 wing section and is ideal for those who like the idea of optional extendable wing panels, and makes a great electric thermal searcher for the sports flyer.
(I live in an apartment) I connected a Watts Up meter in series between the battery and the starter-controller. The Watts Up only records PEAK current. With the engine set right up against compression, the starter hesitated for a brief moment (less than a second) driving the engine through compression. Once through, it spun the engine with ...
The Tee Dee was tested by Aeromodeller Magazine in 1962 and the output power was recorded to be .105 bhp (78 watts) @ 22,000 rpm with a max torque of 5.5 oz.in. at 18,000 rpm on 25% Nitro. [6] (Note: The modern Norvel AME 049 engine which has a ceramic coated aluminum piston outputs .2 bhp (150 watts)@ 17,000 rpm). One horsepower = 746 Watts.
Generally, you want aroound 100 watts/lb for general trainer/sport type flying, 150 watts/lb for sport/light 3D, and 200 watts/lb and up for advanced 3D type flying. You can pretty much figure how much plane you fly with this info. As far as the ESC, you will want to get one that can handle the current draw of your motor/prop combo.
input watts per pound of "all up" airplane weight. The following guidelines were developed before brushless motors were common but it seems to hold pretty well so we will use it regardless of what kind of motor is being used. 50 watts per pound = Casual/scale flying 75 watts per pound = Sport flying and sport aerobatics
If I would have of bought the power 15 Fan set up, I could have run the 4 cell batteries. With the stock fan it pulls too many amps for a 4 cell set up. So if you really want to run the 4 cell set up, get the power 15 complete fan and motor package and you will be fine. I can out run gas planes with my set up at this time.
That would be 60 watts of energy that the motor consumes to turn that prop. (6 amps X 10 Volts) If we go to a larger prop, say 7 inches and keep the pitch the same 5 inches, the draw might go up to 8 amps at 10 volts or 80 watts. Likewise if we went to a 7X6 prop, the draw would go up again, say to 9 amps or 90 watts.
Look at the weight of the plane and the type of flying. 75W/lb for trainers up to about 150-200W/lb for 3D. A decent outrunner motor should be limited to about 3 watts per gram of weight of the motor. Let's use a 7 pound trainer now as an example. 7lbs at 75W/lb is 525W. At 3 grams per watt we're looking at a motor of at least 175 grams.