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Posted by K9000wner | Mar 14, 2015 @ 05:00 AM | 7,644 Views
Electric Flight Rules of Thumb

July 1, 2004 for QuietFlyer Magazine
http://www.stefanv.com/rcstuff/escbec.htm

( Stefan Vorkoetter ) I’ve been writing this column since late 1999, and over the years, have mentioned many rules of thumb. A reader recently asked if these were all written down in one place, so I thought this would be a good opportunity to do exactly that, revise some of the older ones, and see how they work together. None of these rules, used by themselves, will guarantee a good performing airplane, but taken together, they almost ensure it.
Power Systems

Probably the most used rule in the history of electric flight is one originated by well known electric flight guru Keith Shaw. The rule states that for reasonable sport performance, a plane’s power system should draw at least 40 to 50 Watts per pound (W/lb) of airplane. For good aerobatics capabilities, 70 Watts per pound is more suitable. These figures are in terms of motor input power (Watts = Volts x Amps), and assume a motor efficiency of about 75%, which was typical of a good cobalt motor when this rule was suggested. With a modern brushless motor operating at 85% or better, this can be changed to 35 to 45 W/lb for sport performance, and 60 W/lb for aerobatics.

Rules of Thumb:

Another early electric flight rule is that the power system (propeller, gearbox, motor, speed control, and battery) should account for about 50% of the total ready-to-fly weight of the aircraft. This rule, based on...Continue Reading

Fpv

Posted by K9000wner | Mar 11, 2015 @ 07:42 PM | 7,686 Views
FPV goggles are way pricey
trying to do a diy box to use with a remote truck to start with
then get it on a plane ..

got the boscam 200mw system vtx vrx and a cheap camera
hope its not a total waste of time
anyone in the mpls area playing with fpv?
that would let me come over and see how things should work let me know>>