Watt/gram ratio of motors?

GordonFreeman · #1 09-18-2005, 12:51 AM

I'm somewhat new to brushless and have been researching and looking for the perfect motor for my application. There seems to be a ton of choices and I am wondering if anybody has compiled a list of motors and thier attributes? The more I delve into this the more it seems like a Watt (output of motor) per gram (weight of motor) rating would be a nice value to have for a motor. Maybe a safe continuous Watt/gram and Max Watt/gram.

I would like a motor around 100 grams (or lighter of course) and 300W for 5-8 minutes. Kv could be from 2500 to 4000.

tcolesen · #2 09-18-2005, 10:50 AM

This would be a nice comparison for motors! There is a downside to this - a motor could peak at, let's say 3000watts, but might only be able to handle 1500watts continuous. So, watt ratings for electric motors are somewhat useless, as manufacturers would say that a motor is more powerful than it really is. BTW, 1hp=~745watts, so putting a watt rating on a motor would be a lot like giving a horsepower rating to a motor. So, for the first things I said, just replace the word "watt" with horsepower (it will save me some typing too

).

kufman · #3 09-18-2005, 11:23 AM

At that weight you are probably looking at a speed 400 size motor. you may want to look at the Warp 4 series on this page

http://aircraft-world.com/prod_datas...cer/bl4-15.htm

little bit lighter than 100g and 260W for 5 min. The ratings you are looking for are kind of between the lehner 1515 and lehner 1520 series of motors.

http://www.lehner-motoren.de/ms15.php

SpEEdyBL · #4 09-18-2005, 12:53 PM

There are also the lehner 1511 motors. They are 80 grams, 32 mm long and have a 3.17mm shaft. Not only that, but you have at least 10 winds to choose from that match your kv range.

GordonFreeman · #5 09-18-2005, 05:02 PM

I've been a busy boy. Maybe the main problem is finding the actual power ratings (continuous and burst). The Lehners are consistantly rated about twice as much power/gram as others....hmmm....

Feel free to correct and fill in any missing info (and add other motors):

OptimaMan · #6 09-18-2005, 06:48 PM

I've had the 1515 6 and 5 turn motors that I ran with 6 cells in my XXX-S. They're only 90 grams, maybe a tad over 100 with the adapter plate and it was WAY powerful for 1/10 scale. Faster than the 500 size 6s. It was capable of sucking up more than 100 amps with my 3s lipo for brief moments of time!!!!