Prop Rotation - Formula 233 Registry2024-03-28T18:55:57Zhttp://formula233registry.ning.com/forum/topics/prop-rotation?commentId=2050654%3AComment%3A42245&feed=yes&xn_auth=noI have a Mercury Mirage prop…tag:formula233registry.ning.com,2014-01-18:2050654:Comment:425862014-01-18T04:48:41.571ZRickhttp://formula233registry.ning.com/profile/Rick38
<p>I have a Mercury Mirage prop with a 19" pitch. With a light load it runs 5600 RPMs. I cruise at 3800 RPMs . My engine is mounted on a 30 inch deep bracket which puts the lower unit about 36 inches away from transom. Rule of thumb is lift the engine vertically 1 inch for every foot behind transom because the water leaving the transom rises up. My engine is around 3 inches above standard height and this prop hooks up great even at that position.</p>
<p>I have a Mercury Mirage prop with a 19" pitch. With a light load it runs 5600 RPMs. I cruise at 3800 RPMs . My engine is mounted on a 30 inch deep bracket which puts the lower unit about 36 inches away from transom. Rule of thumb is lift the engine vertically 1 inch for every foot behind transom because the water leaving the transom rises up. My engine is around 3 inches above standard height and this prop hooks up great even at that position.</p> Hi Rick, that's interesting.…tag:formula233registry.ning.com,2014-01-17:2050654:Comment:425852014-01-17T04:37:13.297ZWanna Bee 233http://formula233registry.ning.com/profile/WannaBee233
<p>Hi Rick, that's interesting.</p>
<p>My Cavitation plates are absolutely in line with the V of the hull on the inside of each leg.</p>
<p>I will up load a pic's.</p>
<p>I'm running Michigan Wheel large blade apollo props 15 1/4 x 19P, I'm very happy with the improved cruising speed from my old 13 3/4 x 17P props. Obviously lost RPM at WOT. New props WOT is 5000RPM at ~46MPH. The old yammies (1898 150's) have 700hrs on them, I hope to refresh them this year and add a few improvements to try…</p>
<p>Hi Rick, that's interesting.</p>
<p>My Cavitation plates are absolutely in line with the V of the hull on the inside of each leg.</p>
<p>I will up load a pic's.</p>
<p>I'm running Michigan Wheel large blade apollo props 15 1/4 x 19P, I'm very happy with the improved cruising speed from my old 13 3/4 x 17P props. Obviously lost RPM at WOT. New props WOT is 5000RPM at ~46MPH. The old yammies (1898 150's) have 700hrs on them, I hope to refresh them this year and add a few improvements to try and gain my 500RPM back.</p>
<p></p>
<p>Out of interest what prop are you running on your Optimax?<a href="http://storage.ning.com/topology/rest/1.0/file/get/3127159971?profile=original" target="_self"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/3127159971?profile=RESIZE_1024x1024" width="721" class="align-full"/></a></p>
<p></p>
<p>Cheers</p>
<p>Jason</p> Jason thanks for giving us th…tag:formula233registry.ning.com,2014-01-17:2050654:Comment:424572014-01-17T03:58:37.592ZRickhttp://formula233registry.ning.com/profile/Rick38
<p>Jason thanks for giving us the results. That is great news for your boat to be more efficient at cruise because thats where most of us enjoy our boats. It sounds like your boat is running more level at speed so it may even improve in rough water conditions. Please let us know if you raise your engines up higher on transom mounts to see even better results. I have a single outboard on an engine bracket that is 30 inches behind the transom . My outboard cavitation plate is about 7 inches above…</p>
<p>Jason thanks for giving us the results. That is great news for your boat to be more efficient at cruise because thats where most of us enjoy our boats. It sounds like your boat is running more level at speed so it may even improve in rough water conditions. Please let us know if you raise your engines up higher on transom mounts to see even better results. I have a single outboard on an engine bracket that is 30 inches behind the transom . My outboard cavitation plate is about 7 inches above the bottom of boat. Seems to be the sweet spot on my setup.</p> OK switch the gearboxes over…tag:formula233registry.ning.com,2014-01-15:2050654:Comment:424512014-01-15T03:11:07.933ZWanna Bee 233http://formula233registry.ning.com/profile/WannaBee233
<p>OK switch the gearboxes over on my outboards.</p>
<p></p>
<p>The boat uses 3 litres less per hour at 3000rpm (cruise speed) compared with before.</p>
<p>It sits higher in the stern as expected and less trim is required to keep the nose down during cruising.</p>
<p>Overall I am happy with the change and will leave like this.</p>
<p>OK switch the gearboxes over on my outboards.</p>
<p></p>
<p>The boat uses 3 litres less per hour at 3000rpm (cruise speed) compared with before.</p>
<p>It sits higher in the stern as expected and less trim is required to keep the nose down during cruising.</p>
<p>Overall I am happy with the change and will leave like this.</p> I'll spend sometime compiling…tag:formula233registry.ning.com,2013-12-19:2050654:Comment:425232013-12-19T21:46:27.507ZWanna Bee 233http://formula233registry.ning.com/profile/WannaBee233
<p>I'll spend sometime compiling the base line stats. Docking maneuverability isn't great now but I am lazy and don't use the throttles as much as I should, so hopefully I can over come it by making better use of the twin engines.</p>
<p>I'll spend sometime compiling the base line stats. Docking maneuverability isn't great now but I am lazy and don't use the throttles as much as I should, so hopefully I can over come it by making better use of the twin engines.</p> Jason please try to get a goo…tag:formula233registry.ning.com,2013-12-19:2050654:Comment:422452013-12-19T14:06:26.996ZRickhttp://formula233registry.ning.com/profile/Rick38
<p>Jason please try to get a good baseline first with boat speeds at cruise and top end. I'm really looking forward to hear about your results. The only negative I have heard about putting the counter rotation on the starboard side was loosing a little docking maneuverabilities at idle speeds.</p>
<p>Jason please try to get a good baseline first with boat speeds at cruise and top end. I'm really looking forward to hear about your results. The only negative I have heard about putting the counter rotation on the starboard side was loosing a little docking maneuverabilities at idle speeds.</p> Hi Rick
Its only about an hou…tag:formula233registry.ning.com,2013-12-19:2050654:Comment:424152013-12-19T05:48:53.253ZWanna Bee 233http://formula233registry.ning.com/profile/WannaBee233
<p>Hi Rick</p>
<p>Its only about an hours work to do the swap so I will give it ago and report back. </p>
<p>Nothing ventured noting gained and all that.</p>
<p></p>
<p>Cheers</p>
<p>Jason</p>
<p>Hi Rick</p>
<p>Its only about an hours work to do the swap so I will give it ago and report back. </p>
<p>Nothing ventured noting gained and all that.</p>
<p></p>
<p>Cheers</p>
<p>Jason</p> Jason I have noticed on Fount…tag:formula233registry.ning.com,2013-12-19:2050654:Comment:425192013-12-19T05:21:06.028ZRickhttp://formula233registry.ning.com/profile/Rick38
<p>Jason I have noticed on Fountain powerboats that the counter rotated gear cases are on the starboard side so that the props would turn inward from both sides of the hull. From what I have read about Reggie Fountain and his offshore boats he was all about speed and boat handling ! Marine mechanics told me the negative to this set up is it makes it harder to dock the boats at slower speeds. If I had twins I would definitely set it up just like Reggie Fountain does with his boats. Our 233…</p>
<p>Jason I have noticed on Fountain powerboats that the counter rotated gear cases are on the starboard side so that the props would turn inward from both sides of the hull. From what I have read about Reggie Fountain and his offshore boats he was all about speed and boat handling ! Marine mechanics told me the negative to this set up is it makes it harder to dock the boats at slower speeds. If I had twins I would definitely set it up just like Reggie Fountain does with his boats. Our 233 Formula's seem to be a great candidate for this set up. I am very surprised nobody has tested this out yet with these hulls and given the results to us !</p> really nobody has played arou…tag:formula233registry.ning.com,2013-12-18:2050654:Comment:425152013-12-18T12:50:44.426ZWanna Bee 233http://formula233registry.ning.com/profile/WannaBee233
<p>really nobody has played around with this?</p>
<p>really nobody has played around with this?</p>