Hey all,
Got a quick question. I just purchased a new to me 170W Stinger. The prop on it is a 13x17 on the 70HP 2 stroke Yamaha. It is really worn so I'm open to opinions/experiences. I'm getting roughly 5,600 out of my current prop(stock aluminum). I'm likely sticking with aluminum. Is there any benefits to the same pitch in a 4 blade?
Better hole shot and rough water grip....also handling can benefit. For a 70hp and lightweight hull I would think a 3 blade would suffice.
Cons that I know of are slower top end and some 4 blades don't power load as well.
2005 206
BRP 225 H.O. (E225DHLSOF)
Fury 4 24p @ 5,750 fully loaded
Aren't these 2 contradicting statements.Originally Posted by magnumb
The same thing that makes it have a better hole shot would make it power load better, wouldn't it?
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Bullet 20XD w/ 225 ProMax
not if you can't turn it...
Aren't these 2 contradicting statements.
You will get better hole shot with a 4 blade but you should drop down to a 15". I run a 13x19 4 blade and it gets on plane in less than 4 seconds. Top speed is 52mph. My 13.25x21 3 blade takes about 2 seconds longer to get on plane but tops out at 57mph. The 4 blade seems more stable at speed.
How fast are you going at WOT now with the 17" prop? Your about 400 rpm's down right now and a four blade in the same pitch will drop you another 150-200 rpm's.
Ok all, I double checked today(this boat is new to me a week ago). I was told the prop was a 17 pitch, it's actual the yamaha 13x19 K prop. I'm hitting 5,650ish RPM at 35mph on a really badly dinged up prop. When new I was told it would do 38mph. I do plan to ad a 6" jack plate in the spring, I've run them before and enjoyed the extra ability to run in certain conditions and overall gain a small margin of speed.
That prop is stainless steel isn't it? Are you running loaded or light? You need to test it loaded like you'll run most of the time. Running lite you need your rpm's closer to 6000.
It is aluminum. These speeds/rpms were taken loaded(rods/tackle/3 batteries/etc)with 2 guys in the boat. I can test more speeds this Saturday with just myself and my 3 year old but I'm expecting quite similar results being only 100lbs less than the current test.
This boat with the current prop planes out like now, there's no lag time. My guess is 2-3 seconds an I'm on step even with 2 guys. I do have a hydrofoil on it which I'm sure certainly helps.
Duh? If you can't turn it, it won't be worth a crap at anything.
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Bullet 20XD w/ 225 ProMax
My Fury 4 power loads better then any 3 blade I have had , Raker, Tempest plus, Fury 3.
2015 Ranger Z119c / 2015 Merc 225 Pro XS
My Bravo 1 power load my boat as good as my 3 blade props. Had a trophy plus, was a dud power loading
Trophy's don't power load very well at all.
No prop is gonna power load very good if it has a lot of venting. Unless you spin it up 4k.
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Bullet 20XD w/ 225 ProMax
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