2023-01-31 - Switch push motor from 300KV to 230KV for greater efficiency
Requested by Nathan Green - Luigiman54#2439
Description of Change
The current rear push motor is the T-Motor AT4130 300KV. We purchased this high KV motor because we initially thought the largest peoipeller size that would clear the lift props was 16 inches. This motor is rated for a 14 or 15 inch prop, and we elected to use a 15x8 APC propeller. We have now realized that since the motor is an outrunner (the entire motor bell spins, not just the shaft) that the motor has to be mounted on the shaft end (the top) instead of the bottom. This mounting setup allows the push propeller to be a few inches closer to the front of the plane, hence a larger propeller can be used. We would purchase a 230KV AT4130 motor and use an APC 17x10 prop.
Implementation
The new motor will be a drop-in replacement for the current one.
Reason for Change
The efficiency of propulsion will be increased. For example, the efficiency will increase by ~15% at 2kg of thrust, ~22% at 5kg, and ~30% near max throttle. The full chart can be seen here AT4130 Long Shaft Fixed Wing VTOL Motor | T-MOTORĀ®
Priority
Medium
Impact of Not Responding to Change
Icarus will draw 15-30% more current to fly in plane mode.
What Groups, People, Sub-teams Need to be Notified?
Mechanical
Change Impact
Additional Parts/Resources Required and Costs
1x T-Motor AT4130 230KV
2x APC 17x10E Props
Total cost: $190
Impact on deadlines
Once parts arrive: 10 minutes
Alternatives and Recommendations
Alternative is to fly on the current motor with less efficiency.
Comments
Make sure to create a thread in the ārfcā chat in discord (here). Share a link to your rfc in your post so it can be approved!
Change Request Sign Off <System Integration>
Status
Accepted / On Hold / Rejected / More info Requested
Comments
Signatures/Name
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