Hi Manos, What you need is a Torqueshift prop. There are 2 pitch ranges and 2 hub types. 11 to 26" pitch and 14 to 32". Rubber hub and solid hub. Both types work fine. These props vary their pitch while underway. This happends according to prop speed & load. As an example; on my boat, open throttle - load is high - prop stays in low pitch (14) so engine rises to 4700rpm. Boat takes off like a bat out of hell. As boat accelerates, the load on the prop is reducing so the pitch is increasing. The result of this is that the revs stay constant and the boat accelerates up to speed. The advantage is that the engine is giving full (or close to) power all the way up to max speed. In my case max revs is set to 5200-5400. If the throttle was opened fully then that is the engine speed from start right up to max. However, they don't have to be used only in this way. The pitch can be adjusted under way at a steady speed if necessary. If you are cruising, which is what I do, trimmimng out reduces the load and the prop pitches up. Trimming down again, because of hysterisis, the prop remains pitched up and gives the equivalent of changing up a gear. It works very well. If the throttle is opened firmly, the pitch will reduce a bit for acceleration. The hold of the blades is outstanding, you can even surface them and they are happy. Prop breakaway is genuinely a thing of the past. Now then, I'm putting together a new diesel rib and it is using a Volvo dpx drive and, of course, my Torqueshift props won't fit. My spare, solid hub, 11-26 blades is for sale. The other is still on my present boat and it depends on the boat buyer whether it stays there. The boat is not yet advertised for sale. Of course, if you wish to make me a good offer.... I'm looking for less money than 2 solas props (ok props but I wouldn't pay for one.) Go to
www.land-and-sea.com to read about good stuff. You can download a short video of the prop driving a boat. These props are genuiely wonderfull when setup properly. They are better than I've described. I hope this is of help. Email me at
jwalker@rya-online.net if u'd like to chat. Cheers for now, JW
