ORIGINAL: Hydro Junkie
Considering that I'm not an veteran electric flyer, I am really liking the contrasting thoughts on power options for the Electra. What is really refreshing is that everyone involved with this thread has been helpful and not pushing an agenda like I've run into in other forums.
Getting back to the glider, what I was told in a PM is as shown below:
Goldberg Electra = 48 oz.
48 oz ÷ 16 oz in a pound = 3 pounds
3 pounds X 100 watts per pound = 300 watts
This was the basis of the Rimfire .15 as a motor. To take this one step further:
So a 10x5 prop at 10,656 RPM will give us 3 pounds of thrust at a speed of 50 mph using 302 watts.
As for battery pack size, this was the basis used to arrive at the size pack listed earlier:
For my personal taste, (your's will be different) I like to set up my gliders to have five, one minuet runs with one minute of extra for the no
more than 80% use on a charge lipo rule.
I found an easy way to get this is by taking the 27.2 amps and moving the decimal to the left and
converting it to a comma then adding a zero will give a mah we need.
27.2 = 2,72
2,72 = 2,720 rounded up to 2,800 mah
So looks like we need a 3S 2,800 mah pack for the Electra
Since everything was based on a 48 ounce glider instead of a 30-32, everything is sized roughly 50% oversized, that is IF I can build the glider in the 30 or so ounce range
We may need to meet up in the spring since Chilliwack isn't that far from Marysville, just a quick run along I-5