Old 03-27-2015, 02:07 AM
  #89  
Toddah
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Join Date: Feb 2015
Posts: 19
Default motor

Originally Posted by kyleservicetech View Post
Which motor are you considering? FYI, that motor weighs 304 grams, which translates to 10.7 Ounces. Reasonable power levels for these brushless motors is pulling around 100 Watts per ounce of motor. At 1800 Watts/10.7 ounces, you get 168 Watts per ounce of motor weight.

That motor might be running hot enough to fry eggs at that power level. Motocalc indicates running this motor at 1800 Watts will burn it up, and will result in motor efficiency below 50%. Per Motocalc, quality motors will be running around 85% or even 90% efficiency.

For a model of this type, running around 100 Watts per pound of airplane will fly rather nicely. So, if your model winds up at 10 pounds, you'd need 1000 Watts to fly it. More is usually better. Especially if its windy out.

There is a video out on this model, flying with a DLE20 Gasser. This engine has around 1200 Watts of power, and the model flew OK. The pilot had real cg problems though, had to add near a pound of weight in the tail.
It is a Hyperion 4025 12

Spec Sheet here
http://www.hyperion-world.com/dn/zs/zs4020-25.htm

Todd
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