Here's the matching 'normal' www.link to try mounting 2 contra rotating props(one normal, one 'pusher') to 2x TR28-26 1350Kv BL Motors to power an 700g foam glider, will update with more info after test www.link quality, could use a little sanding and balancing, but great as is.
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nive push prop for Robbe Seabee. Engine Roxxy BL 2826/12 (1.450 RPM/V) consume 10,5 Ampere / 3S 2.250 mah Batt. with this Prop by good Thrust. The sound is great.