how does the side padding hold up after some use?? was thinking of removing the side pads and installing some storage hatches for tackle and finishing off with some seadek trimming
BigE
how does the side padding hold up after some use?? was thinking of removing the side pads and installing some storage hatches for tackle and finishing off with some seadek trimming
BigE
I quite like this style of trim i seen at the boat show.
BigE
I would be interested to know what prop suits the 150 suzuki. 2.5 gear ratio is a lot different to the 1.92 merc.
I have a 22" solas 4 blade on the 200.
Had a 20" solas 4 blade on the 175.
Both 2.5 : 1 reduction.
So if I were guessing and I were sticking with that style of prop , maybe 18" /
Cheers
Forgive me if its been covered but how does the 150 go weight wise ?
I think the 18 would be a bit under done on a 2.5 gear ratio. the merc is 1.92 and I run a 17 enertia, which aparently I have been told is closer to an 18 inch prop.
Well its all about top revs. so if the 175 could just max out with light load on a 20" then the 150 would not get there.
!8 is the next one down the range. I bet it would be worth a try.
Use one of the prop pitch calculators. If its the same as the 175 it wants to get close to 6100 revs.The 20 was great for the 175.
When i went up to 200 I started with a suzi 21"4 blade and it spun out.
By the maths a 17" should do it, then you need a different brand
By the way.
I still hav e new merc Rev 4 21" if anyone needs one.
I am a bit confused with suzuki's gear ratio. 2.5 seems like a strange gear ratio for a 150-200. I just used the prop calculator. I am basing this off the enertia 17, which people say is closer to 18, so i will say 17.5 for this case
merc
Prop size 17.5
gear ratio 1.92
6000 RPM
10% prop slip
= 47 MPH - (which is pretty much exactly my top speed on my boat, achieving full revs)
Suzuki
prop 17.5
gear ratio 2.5
6000 RPM
10% prop sli
= Max speed 36MPH - seems pretty slow to me.
According to the calculator you would need a 23 inch prop on the suzuki 150 to achieve the same speed as the merc with a 17, because of the 30% difference in the final gear ratio. I dunno why suzuki would make an outboard with this gear ratio, unless they thought they would sell a lot for commercial use which would benefit from using a bigger gear ratio with a ordinary prop size for pushing heavier hulls.
Did you take into account the gear ratio at the top of the leg on the Spook?? They do swing bigger props than the others at lower propeller RPM's for the same top end speeds. As a comparison Tenzing is swinging a 22" Solas 4 blade and getting about the same results as my ETec 200 swinging a 17 - fuel economy aside - his is better but it should be.Originally Posted by WildFishExpeditions
I just used the prop calculator. what is the "gear ratio at the top of the leg on the Spook" 2.5:1 is the only information on the website.
http://www.marksmarineinc.com/choose...rop-calculator
I know there is margin for error in that because of hull size etc.
However if tensing is saying the 150 will only be able to swing an 18 inch prop from his experience, then its not going to make for a very fast boat. Since we are on a yalta craft thread, I am assuming tensing is talking about the same hull.
Spook = Suzuki. The website doesn't elaborate so I am not sure either but Suzuki run a two stage gear reduction - there is one at the top of the leg and another in the gearbox. The figures quoted may take these into account - website doesn't elaborate. This allows them to run a larger prop than other brands at lower propeller RPM to get the same boat speed which if you believe their marketing is more efficient. Certainly doesn't seem to hurt their fuel numbers. Tenzings rig is the same as mine bar the upgrades he has done - one of which is the new Suzuki 200 - hence the caparison. If you were to run the same prop at the same horsepower on the Suzuki as on your Merc on the same boat it should be under propped and rev it's ring out and as you have worked out - be slow . Be pretty snappy out of the hole though.
The way I understand the 2 stage gear reduction is that there is more than 1 gear used in the process, to finish off with a 2.5 gear ratio. which Suzuki claim this is the "biggest in its class". there marketing says that this is good because it makes maximum advantage of the power produced by the outboard. I guess you could argue this is true as you would lose less crank HP to BHP as the gears are bigger and easier to turn. I cant see how this is beneficial at all once you put a prop in it though, as all the HP saved through a 2.5 gear ratio would be lost when you have to put a bigger prop on that will suck power, to make the same speed as another outboard with a 2.0 gear ratio running a smaller prop. Suzuki says it delivers quick torque (this would be true), better acceleration (this would also be true), more top end speed (Not true). It cannot increase acceleration and top speed at the same time, not possible.
In the real world I dont really know how this 2.5 gear is any better than anything else. it saves HP through the gears, but loses it swinging a 23 inch prop. Only thing I can really think of, as stated above is that they would be good on pushing heavy hulls with small (17 inch) props.
A bigger slow turning prop is far more efficient than a small fast spinning one, so, gear ratio determines what size prop your motor (HP) can turn.
The other thing to "fix" is where the throttle cables come through the side of boat. They allow water ingress which all ends up on top of battery. Also ensure the front hatch is well sealed. A lot of our earlier models let water in when in heavy weather or coping a wave over front.
My yammie has 2.00:1 ratio. I spin a 17p standard yammie black painted stainless. 5800rpms for 40knts.
If we look at the pure math, and apply it for the 3 spooks on the same boat, and assume:
- HP produced is the actual sticker number
- theoretical prop pitch size is correct
- 150/175/200 all attain the same rpm
- slip is the same...
The calculated pitch for the 150 comes out at 19.1" based on tenzings 22" for his 200.
However we all know that the above assumptions are not always correct!
Apply to the Yalta, if it's much easier to push, and the live load always lighter, might get away with a zuke 20 prop, but an 18.5 would be where I would start. (Think they come in that size).
And yes, the published gear ratio is the overall gear reduction.
Cheers
Brendon
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