Bow Lifting Vs. Total Lifting Props???

[Boilermaker]

What would the benefits of a prop with Bow lift be vs. Total lift???<br />Could someone please explain the mechanics of how a prop gets bow lift OR total lift of a hull???<br /><br /> Is it that one prop wants to pull the output shaft down>>>thus getting bow lift? If so>>>how is total lift done?? it wants to lift the shaft??? Wouldn't that cause the transome to rise, but the bow to dig in?<br /> <br />It seems at first to be self explanatory, but the more I think about it, the more confused I am. <br />Thanks

 

[Ron G]

Re: Bow Lifting Vs. Total Lifting Props???

Very good thread,on my boat with a pad i want bow lift for speed and a better ride i think the total lift is a combination of different props and setup.Different props are made for differnet applications with cupping and rake,i'll wait to here what the experts say.

 

[WillyBWright]

Re: Bow Lifting Vs. Total Lifting Props???

Some props produce Bow lift (for speed) and some produce Stern lift (for holeshot). Stern lift models are good for heavy-a$$ed boats like sterndrives and multi-outboard models. I haven't heard of a Total Lift prop. I'd imagine that they combine the effects.

 

[walleyehed]

Re: Bow Lifting Vs. Total Lifting Props???

The Turbo1, Stiletto, Turbo TXP...all OVER-ALL lifters, heck, the Ballistic is even an over-all, as is the rapture.<br />It's the placement of cup/location, trailing edge, tip or entire cross-section + amount + amount of Rake.<br />My avatar is a Scorpion by Solas...notice how far back the blade are. A very good bow-lifter.

 

[Texasmark]

Re: Bow Lifting Vs. Total Lifting Props???

Hey Kenny.<br /><br />Glad you are finally giving the piece of crap Ballistic a nod. It deserved it; at least for me anyway. Grin.<br /><br />Mark

 

[jimmbo]

Re: Bow Lifting Vs. Total Lifting Props???

Raker is an older design but it still holds its own against newer stuff. A real bow lifter but still manages to lift the entire boat. I noticed a real improvement in not only how my boat handled but in how it rode. The Stiletto wasn't too far behind the Raker in bow lift but didn't quite handle the same.

 

[Boilermaker]

Re: Bow Lifting Vs. Total Lifting Props???

Thanks Ken,<br />Any thoughts on HOW they achieve "overall lift" as apposed to bow lift??? <br />Is Bow Lift achieved by "pulling" the transome down as the prop bites into the water??? OR am I way off in my thinking?<br /><br />Thanks for any clearity you can provide

 

[walleyehed]

Re: Bow Lifting Vs. Total Lifting Props???

I'll post a few pics, then try and describe how it works...<br />

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<br /><br />Notice in the top 2 pics, from left to right, how the trailing edge of each prop blade goes from curl down(Turbo1), level(Turbo TXP), and curl up(Scorpion). Also notice how the blades go from cupped at trailing edge slightly to the entire blade being a cup. The TXP has a very thick trailing edge and near 90* to the hub.<br />The "Rake" is very obvious as to the change from left to right, and the pitch of the left prop (T1) is 1" more than the other 2....doesn't look that way, does it...<br />Your idea of the angle having something to do with it is very true, high rake usually means bow-lift, but by changing total cup and placement and even the amount of progression of pitch, they can pretty much design the prop for a combo effect-"over-all lift".<br />Bow-lift is more than just leverage, but in causing that leverage, it changes the trim angle required, which is actually less trim to get the bow up, so there isn't the same amount of downward "push" on the transom that there would be with a prop with say no Rake (blades 90* to hub). One of the problems with high Rake is they don't have much bite for reverse which indicates to me there is much more "total cup" of the entire blade, yet bites very hard from the center, out moving the max bite back as far as possible. A prop like the TXP stays hooked up with nearly half the prop out of the water on some applications, but the whole blade has twice the cup from leading to trailing edge than most high-end SS props have..<br />I have 2 Rakers here but they are so close to the Scorpion I didn't want to make the pics more confusing...the Raker happens to be one of my best all-around props I use and about all of the bow-lift I can handle. The Turbo Lightning has even more bow-lift and I've yet to compare the lightning to the Scorpion in the same pitch.<br />Look at some of the std sterndrives around...notice how the props are usually elephant eared and near 90* to the hub...the center of lift is closer to the transom which actually helps eliminate the downward force vs. lifting the transom even though they are sometimes called "Transom lifters".<br />I'm sure this is clear as mud.....wish I could draw on this, but this is the best I can do.

 

[Boilermaker]

Re: Bow Lifting Vs. Total Lifting Props???

Thanks Ken,<br />That actually cleared up a lot for me! I think I have a better handle on it now. Thanks for the photos. They helped even though it was a little hard to see the amount of cupping, and blade tip curves on my monitor.<br />A great job >>>thanks again!<br /> <br />Jim