Sailing NVvideo
Marine propeller underwater installation - the ONLY prop in the WORLD that can do this!
17 April 2025 · 11 min · 4K views · Indonesia
What this video covers
Timo installs a J prop feathering propeller on NV while anchored in Indonesia, working entirely underwater using battery-operated dive gear supplied by Dive Blue.0:59 The J prop, sponsored by Marine Propeller, is claimed to be the only propeller in the world with manually adjustable pitch underwater; it is also expected to add 1.5 knots of boat speed and reduce sailing drag through self-setting blades.0:14 Removing the old propeller required cutting one bolt that Timo had over-tightened during a previous underwater installation.0:29 During removal, plastic debris found jammed in the shaft seal was identified as a contributing cause of water contamination in the gearbox oil.1:29 For the installation, Timo ties an old sail beneath the hull as a net to catch dropped tools and hardware.1:16 The new propeller seats on a tapered shaft with a Teflon ring to control tightening torque; a 30 mm wrench tightens it, and an Allen key clockwise locks it onto the shaft while counter-clockwise extracts it.2:29 Timo blocks the engine via a socket on the main shaft to prevent rotation while torquing.4:20 Finishing options discussed include prop speed coating, prop pooling, or grease applied periodically.8:10
More from Sailing NV
From Sailing NV — see the channel’s boat, crew, and every analysed video.
The Sailing Directory Newsletter
One email with the fleet's best finds — the moments, boats, and stories worth your watch time. Enter your own address to get your own copy.