high rake s/s

[cougar1985]

hi guys ive been fooling around with my 16 foot glass boat(older v hull).i have a 19p vortex prop on a 1982 90 hp. evinrude.ive tried several differnt props and also raised the motor on the transom.as far as i know the motor is tuned correctly.i will look into this further.the best i seem to be able to get is 5000 rpm at 43.9 gps.ok so the big question would be ,would a high rake prop such as the ballistic s/s help by getting more of the boat out of the water? it seems to me that my main problem seems to be a conservitave hull design.i realy dont know the weight of the boat but cap.is rated at 625 kg.any thoughs on solas props.

 

[walleyehed]

Re: high rake s/s

First, the numbers you give with the 19P is not possible...these numbers produce 4% slip..out of the question for about any prop on any rig.<br />I think your tach is about 300-400RPM off as you have a known GPS speed and a known prop pitch. Figuring a low slip ratio of 10%, the RPM should be around 5400.<br />As for the Ballistic, it (in MY testing) has very little bow-lifting capabilities. It tends to vent much sooner than say, a Raker, Turbo, Stiletto, etc..<br />Solas props are OK, but most are not built for a high concentration of bow-lift...the Scorpion is, but won't fit the V4 gearcase. You may want to look at an Apollo, they have a bit more Rake, and should be better bow-lifters than the Ballistic.

 

[walleyehed]

Re: high rake s/s

Jacking height...Go up as far as you can without venting greatly or start getting water pressure fluctuation.

 

[cougar1985]

Re: high rake s/s

first let me say you sure type fast. im still at 1 1/2 fingers.lol. ok so the tac reads ok at low rpm im positive. when i hooked it up i hooked it to the 3rd screw down on the elect strip.(on motor). may be i have it hooked to the wrong one?? the motor does run really nice to my untrained ear.

 

[cougar1985]

Re: high rake s/s

argggg . i left out one possible important fact. i use a trolling plate!i did notice a very slight diff in rpm with it off but no where near 3-4 hundred

 

[cougar1985]

Re: high rake s/s

is the apollo a new prop or close out mich wheel(discontinued).i noticed it had the same hub as my vortex. how about solas titan?

 

[walleyehed]

Re: high rake s/s

The Apollo is a new design, and will likely replace the Rapture over time. Yes, the flo-torqII and XHS hub systems are interchangable.<br />The Titan is a standard use, SS prop. Not really in the class of Bow-lifters...it has bow-lift, but is classified as an "over-all" type.

 

[cougar1985]

Re: high rake s/s

ok thanks a lot i will see if i can get here for good price if not i can get of of i boats i guess.do you lose any speed by going from aul to stainless of the same pitch? stick with 19p or go to 17p?

 

[walleyehed]

Re: high rake s/s

That depends on prop design...usually a stainless prop pulls a tad harder, but it may have more lift resulting in less wetted surface and "may" be faster....it's really a test..<br />If you're at Max RPM now, stay with the same pitch.

 

[cougar1985]

Re: high rake s/s

thanks, thats exactly want i want ,more lift.

 

[cougar1985]

Re: high rake s/s

on the post with bassin fever you say the solas is the highest rake prop youve seen? witch one is that. is it applicable to me? sorry to be such a pain but i want to get it right the first time its a lot less expensive.

 

[LubeDude]

Re: high rake s/s

Originally posted by walleyehed:<br /> Solas props are OK, but most are not built for a high concentration of bow-lift...the Scorpion is,

Boy howdy, Thats an understatement!

 

[cougar1985]

Re: high rake s/s

upon further reading i see that the prop you tried does not apply to me.so back to square one!lol.very intruiged by the hustler aul.

 

[walleyehed]

Re: high rake s/s

We may need to find a Raker or Lightning Jr if you don't want to try an Apollo, but I think it would be a good choice.<br />The hustler would be an OK, all-around alum prop, but it will have slightly less bow-lift than a stainless of good quality.

 

[cougar1985]

Re: high rake s/s

ok got to check the piggy bank then decide what to do.still interested on how the hustler will do on texas marks test.

 

[cougar1985]

Re: high rake s/s

new twist to the prop saga. went out with the manual and found out somebody previous to me had detuned the engine.got it back to base and runs a lot better ,will take it out tomorrow to finalise . the motor was orginally a canadian coast gaurd motor one of two on a boat. would they have purposilly detuned it?since 1990 or so its been sitting in a corner of the local fire hall till i bought it last year from a city employee<br />who never ran it atall.

 

[walleyehed]

Re: high rake s/s

Could be....In the late 70's, every V4 Johnson we bought (We were dealers) had max advance set 3-4 degrees retarded. we broke them in that way, then slowly moved them up about 2 degrees PAST max advance due to our higher altitude.<br />Don't try that at sea-level...you won't like the out-come...

 

[cougar1985]

Re: high rake s/s

ok kenny i put it at base,and instantly it stsarted up much better.i will get a mechanic to properly set it up for here which is not much above sealevel.690feet i think. the guy i will get to look at it has a test prop and the river is just down the road so should not be too hard to get it spot on.best i could do without the proper equip. is close which is much better than it was.of course this may change the prop selections also.lol