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post #1 of 13 Old 03-23-2011 Thread Starter
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Max Prop Does it

I have a Pearson 424 with a Yanmar engine walter Vdrive an velvet drive Trans. Total reduction 2:1 13x18 fixed prop. I have the boat on the hard and am looking at Max Prop for a upgrade. I haves several Questions. One will the boat still power Sail. Add just enough throttle to make a couple extra knots without the prop slamming the pitch stops on waves and boat wakes? Two will following seas cause the prop to load and unload the pitch stops? I have read everything I could find on it but no one has mentioned these things. I was caught it a tropical storm and know the loads on the boat. If I was running cross seas or Down in 9 ft or bigger would the prop unload and try to feather itself while its turning? Thanks I want one but not if its going to not work all the time and not self-destruct in bad conditions when I need it most.
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post #2 of 13 Old 03-23-2011
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Email PYI with your questions.. they are very good at followup.

PYI Inc. Max-Prop PSS Shaft Seal Seaview Radar Mounts R&D


We have one; have yet to install it (shaft issues) but looking at how it works I can see if the boat surges down a wave it might tend to feather despite the shaft slowly turning... but that's just a guess. Whether or not that would cause damage is hard to say.

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post #3 of 13 Old 03-23-2011
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You might send a note to MaxProp with your questions. I have had good experience with their technical representatives.
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post #4 of 13 Old 03-23-2011
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In my limited experience with a maxi prop, if we're going so fast that we would have to worry about the prop feathering, we're not motor sailing, we're sailing.

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post #5 of 13 Old 03-23-2011 Thread Starter
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TejasSailer Thanks for the sugestion but I am not always sure Sales would have my best interest in mind. erps thanks but I have been in a situation were I have 50 miles to make port before a TS gets to me and Its possible it can turn into a Hurricane being slammed from Port with breaking seas and wind over 40 mph single handed afraid to put up sail The waves were big enough to to cause me to pickup speed and loose it up the back of the next. (before you ask I had no intention of getting caught in this storm ) I just dont want to put something on my boat that might fail in these conditions. Hopping someone who has experience with a Max Prop can shed light on this .. Thanks
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post #6 of 13 Old 03-23-2011
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Quote:
Originally Posted by P424 View Post
I have a Pearson 424 with a Yanmar engine walter Vdrive an velvet drive Trans. Total reduction 2:1 13x18 fixed prop. I have the boat on the hard and am looking at Max Prop for a upgrade. I haves several Questions.

One will the boat still power Sail. Add just enough throttle to make a couple extra knots without the prop slamming the pitch stops on waves and boat wakes?
Two will following seas cause the prop to load and unload the pitch stops?
In my experience with Max Props [15+ yrs, 10K+ miles]

One - can't happen. Max Prop is geared and as long as shaft is spinning faster than prop it is in gear. We have motor sailed thousands of miles some in easy conditions some in not so easy conditions . Probably the worst was a line squall taking sail down / 70+ knots of wind. Not fun.

Two - same answer as #1. Never heard of or seen that either.

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post #7 of 13 Old 03-23-2011 Thread Starter
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svsirius Thank you for your input just what I was hoping for someone who had used them in tuff conditions. I will probably order one next week. Thanks all of you for the answers
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post #8 of 13 Old 03-24-2011
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max prop and velvet drive

I've had my max prop for over 25 years and never experienced any problems even though I usually either sail or motor and seldom motor sail. I also have the velvet drive transmission and I'm more concerned that the prop is feathered as I sail in light air. Not sure if "locking" the transmission is gear or just leaving it in neutral is best. It probably doesn't make any difference.
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post #9 of 13 Old 03-24-2011
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All sorts of conflicting feedback on the proper transmission position for a max-prop under sail. I have migrated to placing it in reverse after shutting down to feather the prop, then back to neutral after a few minutes.

The only trouble I've ever had was once backing up in a strong crosswind. I was moving a bit faster than usual to compensate and the wind got the better of me. I took her out of reverse and into forward and nothing....... You should feel what that is like when you are now drifting uncontrolled toward your neightbor's boat! Quickly put her into neutral, then back into forward and she responded. I suspect I went from reverse to forward too quickly for the prop to properly reverse pitch.

Other than that one learning experience, it's been great. Highly recommended.


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post #10 of 13 Old 03-25-2011
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Quote:
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All sorts of conflicting feedback on the proper transmission position for a max-prop under sail. I have migrated to placing it in reverse after shutting down to feather the prop, then back to neutral after a few minutes.
.
Per PYI that is the proper procedure. It's how ihave done it for as long as Ihave owned them.

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