Watt meter

[dloh]

I know that a watt meter is a very important tool one can get esp when u deal with electronic rc plane,...but how do tell from the data given by the watt meter if the prop is not right for the motor..esp when some motors just come with little instructions beside KV nos and cell recommendation. Can anyone give some examples?

[chiadennis]

Basically watt meter don't tell you a lot except when you reach your maximum amp of your motor and esc. Prop diameter and pitch all influence the amp drawn. What you need is to build yourself a thrust gauge and play around with different prop diameter and pitch to see what prop gives you the best thrust on a given amp/volt. Again different prop brand also influence the thrust and amps.

http://www.rcgroups.com/forums/showpost.php?p=5404883&postcount=3

[Sunstorm]

I know that a watt meter is a very important tool one can get esp when u deal with electronic rc plane,...but how do tell from the data given by the watt meter if the prop is not right for the motor..esp when some motors just come with little instructions beside KV nos and cell recommendation. Can anyone give some examples?

Watt meter only tell you the amp consumption for the motor itself. E.g. this motor at full throttle eats about 20 amps. The amps x volts on the battery translate to watts.

esp when some motors just come with little instructions beside KV nos and cell recommendation.

By 'prop' being not right, you would need to check the watts per pound rule and the type of plane. It is a rough guideline. you can do a search on rcgroups for it.

Lower Kv generally swings bigger prop but have max amp rating.