While browsing the HobbyKing Turnigy motors, noticed that the 80-100 was compared to 80cc gas. And what struck me was the 80-100 could give some value with 8 & 0 as the 1st 2 digits.
https://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=5142
After talking with a few other bike builders and noticing the differences between outrunners (Turnigy) and inrunners (Astros), it seems that the length X diameter size is a more accurate indicater of "potential" power than mass/weight. The Astros are heavier, yet the Turnigys are torqueyer. Also, this measure makes for a nice comparison to 2 stroke bike kit motors.
Using this concept:
Turnigy80-85, 80 X 85 = 6800 or 68 rounded up to 70,
Astro 3220, 3.2 X 3.4" or 81mm X 86mm = around 70,
Check the motors below; the solid black anodized motor is an Astro 3210:
View attachment 1
It's 56mm long X 80mm dia. = 44.6 or about 45, and more/less performance in the ballpark of 45cc 2 stroke bikes.
One other motor measure lends to this concept:
The Turnigy Max50, just under 63mm X 80mm which rounded equals 5000. Its' label states 50cc. Kinda easy to deal with.
I've been thinking of ways to classify e-motors. Karting, quads, motorcycle racing all use cc (and shifter) to designate racing categories. What easy methods/units can be used to specify e-power motor potential relating to RC powered bikes
https://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=5142
After talking with a few other bike builders and noticing the differences between outrunners (Turnigy) and inrunners (Astros), it seems that the length X diameter size is a more accurate indicater of "potential" power than mass/weight. The Astros are heavier, yet the Turnigys are torqueyer. Also, this measure makes for a nice comparison to 2 stroke bike kit motors.
Using this concept:
Turnigy80-85, 80 X 85 = 6800 or 68 rounded up to 70,
Astro 3220, 3.2 X 3.4" or 81mm X 86mm = around 70,
Check the motors below; the solid black anodized motor is an Astro 3210:
View attachment 1
It's 56mm long X 80mm dia. = 44.6 or about 45, and more/less performance in the ballpark of 45cc 2 stroke bikes.
One other motor measure lends to this concept:
The Turnigy Max50, just under 63mm X 80mm which rounded equals 5000. Its' label states 50cc. Kinda easy to deal with.
I've been thinking of ways to classify e-motors. Karting, quads, motorcycle racing all use cc (and shifter) to designate racing categories. What easy methods/units can be used to specify e-power motor potential relating to RC powered bikes