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Shallow Water/ Running High on Jack Plate
Posted on 12/5/14 at 12:07 pm
Posted on 12/5/14 at 12:07 pm
Im going hit some shallow ponds tomorrow and i will be running my motor pretty high up, high enough to where my prop looses grip, but i still have water pressure.
What is the negative affect of running a prop when it cavitates? My motor grabs an extra 5-700 rpms, but i keep it within max RPM's.
eta( motor is a 90 2 stroke)
What is the negative affect of running a prop when it cavitates? My motor grabs an extra 5-700 rpms, but i keep it within max RPM's.
eta( motor is a 90 2 stroke)
This post was edited on 12/5/14 at 12:09 pm
3
Posted on 12/5/14 at 12:21 pm to Elusiveporpi
I doubt you will burn the hub where the blades attach by just running it for a day or so.
Posted on 12/5/14 at 12:35 pm to Elusiveporpi
Mechanically you should be fine. I assume you know this, but to making a sharp turn with a prop that's already blowing out while going in a straight line could be difficult.
Posted on 12/5/14 at 12:48 pm to Fifthstring
ok, good, I have read somewhere about air pockets froming, creating heat on the blades, something something.. and it messes the prop up, but i was skeptical about that.
no if i could only keep the gnatts of me tomorrow i would be high sailing
no if i could only keep the gnatts of me tomorrow i would be high sailing
Posted on 12/5/14 at 12:54 pm to Elusiveporpi
i know man... tomorrow should be a fantastic day for sight fishing... dieing to go
Cover up as much skin as you can and spray Amber Romance on the face and hands and you should be fine with the gnatts.
Cover up as much skin as you can and spray Amber Romance on the face and hands and you should be fine with the gnatts.
Posted on 12/5/14 at 1:02 pm to Elusiveporpi
quote:
no if i could only keep the gnatts of me tomorrow i would be high sailing
I got three words for you.
Ther Mo Cell
Posted on 12/5/14 at 1:04 pm to Elusiveporpi
I'll be out there tomorrow. Looks like <5 mph winds most of the day which means gnats in full force
Posted on 12/5/14 at 1:15 pm to PapaPogey
quote:
gnats
Pack of Marlboro lights, chain smoked
Posted on 12/5/14 at 1:20 pm to PapaPogey
yep. and its going to be low as can be tomorrow morning.... and foggy. I'm heading down there tonight to beat the fog.
Posted on 12/5/14 at 1:31 pm to Elusiveporpi
quote:
ok, good, I have read somewhere about air pockets froming, creating heat on the blades, something something..
Yep, cavitation. Cause of a lot of pump failures. It will weaken your prop blades over time but I don't think it will be noticeable in this case.
Posted on 12/5/14 at 1:34 pm to Elusiveporpi
You'll be fine, ya know. I could bring mine if you need me to pull u out. Lol.
This post was edited on 12/5/14 at 1:40 pm
Posted on 12/5/14 at 2:15 pm to GEAUXLPOST
quote:
GEAUXLPOST
ill burn it up trying to get out, i NEED a 150 SHO on the back of it anyway
Posted on 12/5/14 at 2:17 pm to Elusiveporpi
Or an 88 Johnson
Posted on 12/5/14 at 2:18 pm to Elusiveporpi
quote:
I have read somewhere about air pockets froming, creating heat on the blades, something something.. and it messes the prop up, but i was skeptical about that.
that is from cavitation. I think what you are getting is aeration. you should be good.
Posted on 12/5/14 at 2:32 pm to GEAUXLPOST
quote:
Shallow Water/ Running High on Jack Plate
Or an 88 Johnson
you know your stuck when your johnson 88 cant get you out, but after you blow it up, the wind blows you out.....
Posted on 12/5/14 at 2:34 pm to ReelFun
quote:
cavitation. I think what you are getting is aeration
Can someone explain the difference between the 2
This post was edited on 12/5/14 at 2:39 pm
Posted on 12/5/14 at 2:57 pm to Elusiveporpi
quote:
Can someone explain the difference between the 2
Aeration - is the introduction of air to the propeller blades. In high-performance applications, a little aeration is OK, even beneficial. But on recreational boats, it’s not necessary and ends up feeling like a slipping transmission. Propeller blades won’t bite—because the water isn’t staying attached to the surface of the propeller blade—and they end up spinning freely. It happens most often during hard turns or when you trim the drive up too far.
Caniataion - cavitation is a disturbance of water flow to the face of the propeller blade or blades. When it happens, you’ll feel excess vibration. Physically, cavitation occurs when low-pressure bubbles form on the blade surface, which can generate enough heat to burn the face of the propeller blade. If you have ever seen a painted aluminum prop with all those little dings and pits on the face of the blade, you have seen the results of cavitation. Chief causes of the phenomenon are bent or nicked blades, which initiate the disturbance of water flow across the blade surface.
Posted on 12/5/14 at 3:27 pm to Fifthstring
I usually see this where the blades meet the hub, not the blades themselves. But, I'm running 38" wheels or larger and only turning 2300 rpms or less. Also, they are nibral (nickel, bronze and aluminum), not stainless or just aluminum.
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