Piranha Composite Propellers

dogon dory · Posted: Sun Mar 19, 2006 9:58 am Post subject: Piranha Composite Propellers

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starcrafttom · Posted: Sun Mar 19, 2006 1:02 pm Post subject:

have you tried the comprop brand??

TyBoo · Posted: Sun Mar 19, 2006 1:34 pm Post subject:

I have a llot of info on these, DoD, and some good suggestions. But you done scared me off I am staying out of it.........

dogon dory · Posted: Sun Mar 19, 2006 3:05 pm Post subject:

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starcrafttom · Posted: Sun Mar 19, 2006 3:33 pm Post subject:

I had a comprop on my 70 eveinrude and loved it. so i tryed one on my honda 90 and found that it flexed to much trying to get no plane. I really loved the 4 blade props so i ended up going with a alum 4 blade by solas. That has the advantages of a four blade and the stiffness of a alum prop. the cost was low too.

Casey · Posted: Sun Mar 19, 2006 4:21 pm Post subject:

DoD - I've been thinking about trying the Piranha prop for a while, but just haven't gotten to the buying stage.

From what I read, they recommend their SB-4 hub together with their A-4 blade to get the full 14" diameter Suzuki permits. sounds like a pretty good solution to me ... I just haven't given it a try yet.

I've been using a ProPulse 4-blade for a couple years (have tried 17, 18, and 20 pitch). I don't haven any complaint with ProPulse, but would like to try something that permits the full diameter. My ultimate objective is to find something that will let me get closer to 4mpg with the Suzuki 90 at cruise (about 4200rpm).

Let me know if you go for the Piranha.

Casey
C-Dory Naknek

SeaSpray · Posted: Sun Mar 19, 2006 9:45 pm Post subject:

I have been told the Suzuki and Johnson 90 are the same motor and they look identical. Is the lower end and the gearing the same?

I bought a propulse 4 blade for the Johnson but it is too small. Got a deal at the WM discount area so I can't take it back.

I would like to try another 4 blade though.
Steve

Casey · Posted: Mon Mar 20, 2006 7:27 am Post subject:

Steve,

As far as I know the Johnson and Suzuki are exactly the same, (including the gearing) just different decals and paint.

Like you, I have the ProPulse. Best pitch setting seems to be 17inches. As mentioned earlier, I am not dissatisfied with the Propulse, but would like to maximize performance (and hopefully get a slight mileage increase in the process).

Since it sounds like you and Dan (and others maybe...) have Suzuki/Johnson's we might want to compare notes. I have a couple of spreadsheets with performance data I've collected that plot speed and fuel mileage with the ProPulse and the original Suzuki prop (14" x 17P x 3). If you want the spreadsheet drop me a note at: lorencasebeer@aol.com

Casey
C-Dory Naknek

dogon dory · Posted: Fri Apr 28, 2006 12:23 am Post subject:

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Salmon Slayer · Posted: Fri Apr 28, 2006 11:15 am Post subject:

Wow that is an interesting prop DoD, I will be very curious to see how it does.

The prop on my Suzuki 90 is looks huge already and I dont have the math savy to work out all the pitch and diameter variables so for those of us mathematically challenged..your leading the way!

Norm S · Posted: Fri Apr 28, 2006 11:37 am Post subject:

My question for some of you smarter folks than me out there is going from a three blade to a four blade prop should the pitch remain the same? I'm presently running a 14 dia x 15 pitch on my etec. I do have a propulse that is left over from my previous motor that will fit. The pitch range however is 16-20 and it is only 13" dia. the pirahna however does one in both a 14x15 and a 14x13. I will give the propulse a try when I get the chance but will I be losing something by going to the decreased dia? Thanks in advance.
Norm

dogon dory · Posted: Sat Apr 29, 2006 2:15 am Post subject:

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Sea Wolf · Posted: Sat Apr 29, 2006 5:06 am Post subject:

Norm-

Sorry the gang didn't pick up on your question earlier!

Dan has given you the straight story about what can be expected in your situation.

The only thing left to do is to mount it up, give it a spin, and see what happens!

It seems that we have some some foot dragging on making predicions about props these days.

That's because nothing seems less predictable than propeller performance.

Too many variables and unaccounted for performance details.

Stick your neck out and those prop blades will get you every time!

Not to worry, just give the other prop the whirl and give us the straight spin on what you get.

Joe.

computer-rooter · Posted: Sat Apr 29, 2006 9:51 pm Post subject:

this is all very technical to a noobie. Disgust

I'm reading with interest, since the honda 90 I'm looking at buying has no screw attached. Now I get a chance to try understanding metal vs plastic or something, 3 vs 4 blades (unless Beaver Cleaver designs it), diameters and effective blade area, pitch . . . hubs . . . yikes! Smile

Assuming I don't know how any of these materials, designs, or screw geometries translate to speed, economy, and engine life, and assuming I want the potential to push my 22' classic at a max speed of about 30knots light (no, I don't generally drive it there), and a probable cruise speed of 13-15 or thereabouts loaded, and get the best economy and life out of this honda 90, and assuming I'm gonna run over kelp with it, can one of you more-smarter-than-me guys make a recommendation for a starter prop? What would I expect to pay for one? Is it safe to buy a used one? Does it help to wax it?

Maybe I need more coffee?

Rolling Eyes

Thanks in advance!

rooter

dogon dory · Posted: Sat Apr 29, 2006 11:43 pm Post subject:

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