Ramona said..This is for badinfluence but would be equally useful for outboards on inflatables. The photo is of my 3.5 Tohatsu and sits in between the two hulls of the cat. Its right where the bow wave from each hull meets and this causes lots of cavitation. You will notice I have added a larger cav plate to the normal cav plate in Stainless steel, this alone makes a massive difference. The korts nozzle is just glass cloth over plastic, there is a strip of carbon there too but that's just for show! The korts nozzle gives lots more thrust.
One of these would also give some improvement in reducing cavitation.
http://www.ebay.com.au/itm/Boat-Stingray-Xrlll-Hydrofoil-Stabilizer-Fin-Jr-Whale-Tail-for-Outboard-Motors-/281141544890?pt=Boat_Parts_Accessories_Gear&hash=item41755787ba[URL=

.html]

Hi Ramona
thanks so much for the image....it helps me get my head around what to do. Pretty sure I will go this way and not with the hydrofoil...been doing a bit of reading and the dynamics seem to make more sense with the Kort's than the foil. Talked to the Propguard people yesterday...very helpful. Was hoping to see my engineer mate yesterday to further discuss it, but wasn't to be.
@brizzydave....thanks for your offer. I'll pm you and sort something.
@drrog....as Howard Carter said upon opening Tutankhamen's tomb..."I see wonderful things". Those dorade boxes truly are very pretty. Exactly what oil did you use? Looking shamefully at my grab rails

.
For today...quick washdown of where the rubbing strip came off before I head out (on someone else's boat) for the SAGS.