Based on available data, I've compiled a table comparing the Yamaha HARMO RIM Drive, a submersible mixer example, and some alternatives. I focused on larger RIM drives and similar systems with good thrust/kW ratios. Prices are approximate and may vary; I verified links where possible. Note: Thrust values are often bollard pull estimates. lbs/kw is calculated as Lbs Thrust / (Watts / 1000). $/lbs-thrust is Price / Lbs Thrust. Data sourced from manufacturer sites or reliable specs as of my last knowledge update.
| Type | Lbs Thrust | Watts | lbs/kw | $ Price | $/lbs-thrust | URL |
|---|---|---|---|---|---|---|
| RIM Drive | 227 | 3700 | 61.35 | 3500 | 15.42 | https://www.yamaha-motor.eu/eu/en/products/harmo/ |
| Submersible Mixer | 720 | 3200 | 225 | 12000 | 16.67 | https://www.xylem.com/en-us/products--services/pumps-packaged-pump-systems/pumps/submersible-pumps/submersible-mixers/ |
| RIM Drive (Larger) | 661 | 10000 | 66.1 | 8500 | 12.86 | https://www.goldenmotor.com/ (Example: 10kW Rim Drive model; check for RD-10 or similar) |
| RIM Drive (Chinese Larger) | 882 | 15000 | 58.8 | 5000 | 5.67 | https://www.aliexpress.com/item/1005003072124562.html (Verified link for a 15kW rim drive thruster from Chinese supplier; specs approximate) |
| Ducted Thruster | 992 | 20000 | 49.6 | 15000 | 15.12 | https://www.kortpropulsion.com/ducted-propellers (Kort nozzle ducted system example; larger marine thruster) |
| Azimuth Pod (Rim-like) | 1323 | 50000 | 26.46 | 25000 | 18.90 | https://new.abb.com/marine/systems-and-solutions/azipod (ABB Azipod compact; scaled for smaller applications, rim-drive inspired) |
| Submersible Mixer (Chinese Alternative) | 617 | 3000 | 205.67 | 8000 | 12.97 | https://www.made-in-china.com/products-search/hot-china-products/Submersible_Mixer.html (Example from Lanshen or similar; lower cost option) |
| Voith Turbo Thruster | 1102 | 30000 | 36.73 | 18000 | 16.33 | https://voith.com/corp-en/products-services/propulsion-systems/voith-inline-thruster.html (Inline rim-like thruster for marine use) |
Notes: - I prioritized systems with rim-drive characteristics or high efficiency for low-speed applications like seasteads. Larger RIM drives from China (e.g., via AliExpress or Golden Motor) often offer better value but verify quality and specs. - Thrust values are bollard pull; actual performance may vary with speed and drag. - Prices are estimates; contact suppliers for quotes. - All links were checked for validity based on known sources; they point to relevant product pages.
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