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Prop rake angle
A greater rake angle generally improves the ability of the propeller to operate in a ventilating situation. Ventilation occurs when blades break and re-enter the water’s surface — such as occurs with 1) a Bravo sterndrive installed with a high “X” dimension, 2) a surfacing drive (NXT1, NXT6 SSM or M8) or 3) an outboard installed or jacked high on a transom. In surfacing operation, higher rake can hold the water better as it’s being thrown into the air — deflecting it aft and creating more thrust.- Fred Kiekhaefer Anyone ever try the higher rake angle props on a heavy flat bottom? Seems like it would be the ticket for high x dimension cleavers and trying to lift the heavy bow of my boat. Prop guy from Mercury thought the higher rake props have high slip numbers in the midrange but wasn`t sure.. |
I have..........didn't like it at all! Seems like the boat walked more with it. I have no idea if that possibly can be an affect, but that is what it felt like to me.
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What did you try .. 18*??
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Its all about the angle of attack
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I dont have a high x, but the rake helped keep my bow up with my Outlaw. The Rev4 had more rake vs the B1 stock form. When I tried the Rev 4, it held the bow up well, better than the B1 until I had bblades lab the B1. I had planned on labbing anyway, so after talking to Brett (bblades), he explained the B1 labbed with better results, so I ended up doing that. Had I found a higher pitched Rev4 to try before labbing.. it may have changed the outcome of which prop i ended up with.
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I have found that the high rake angle on high X dimension tends to give a lot of tail lift and makes the boat walk a little. And if it has a heavy bow it wont carry the bow it just picks the back up and bow steers at high speeds.
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2x on Team Archer response.
I did a lot of testing with both the Dragon and GTMM with 5 and 6 blades and high rake. we had the same issue of the high rake lifting the ass end and making her unstable at high speeds over 80. They both likes a little deeper X with less rake. Much more predictable in high speed turns as well. |
Originally Posted by ICDEDPPL
(Post 4548842)
What did you try .. 18*??
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Originally Posted by ICDEDPPL
(Post 4548842)
What did you try .. 18*??
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You can gut the cabin like I did and loose a bunch of weight----time boating, money, sanity ect. :hitfan: but you will probably be able to use the same props you have now.
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You try spacing down to help leverage the bow yet?
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How much bow lift do you need from a Bayliner trawler?
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I run 15 rake, merc 5 blade CNC cleavers, 17.75 diameter. It loves trim after 70
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Originally Posted by nailit
(Post 4548896)
I dont have a high x, but the rake helped keep my bow up with my Outlaw. The Rev4 had more rake vs the B1 stock form. When I tried the Rev 4, it held the bow up well, better than the B1 until I had bblades lab the B1. I had planned on labbing anyway, so after talking to Brett (bblades), he explained the B1 labbed with better results, so I ended up doing that. Had I found a higher pitched Rev4 to try before labbing.. it may have changed the outcome of which prop i ended up with.
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Originally Posted by Team Archer
(Post 4549018)
I have found that the high rake angle on high X dimension tends to give a lot of tail lift and makes the boat walk a little. And if it has a heavy bow it wont carry the bow it just picks the back up and bow steers at high speeds.
What you`re saying just goes against everything I`ve read.. interesting. |
Originally Posted by ICDEDPPL
(Post 4550043)
What kind of boat?
What you`re saying just goes against everything I`ve read.. interesting. |
When it comes to rake, I preferred the Ames 36" leaf rake over the 24" & 18" thatch. Dan if your looking for more bow lift, here are a few options. Start with the washer & dryer. Then out with the AC, stove, dishwasher & fridge. Next go for the lazy boy & couch. I think that would be a great stating point. LMAO. Also there are hotels near marinas. Just saying. Well bow lift problem solved. No charge for this one Dan. Lol. Hope
all is well & hope to see you guys again this summer. Todd |
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