Al,
Was your Hornet similar to mine and if so what size/pitch prop did Solas provide you?
I am still awaiting a reply from them - probably still on Xmas holidays?
Marty
Al,
Was your Hornet similar to mine and if so what size/pitch prop did Solas provide you?
I am still awaiting a reply from them - probably still on Xmas holidays?
Marty
nq,
I got a reply from solas [ Steve Evans] but it wasn't too helpfull I may have to ring them . He wants to sell me the same prop 12 1/4 x15 compression cast. But he didn't really offer any alternatives in pitch or diameter. I'm interested in what Al's got on his boat. But I think I'll install a guard I don't think I've hit my last rock. I'm also wondering about the foil. My boat needs a wheel alignment ? something fierce I can't let go of the wheel and it's always been that way.
Wade ??? ???
Hi woody
To fix that problem you only need to adjust the little fin above your prop. mark it before ya move it, doesnt need to be moved very far. wheel alinement done
cheers
blaze
Unreal , thanks blaze
Wade
G'day fella's,
SOLAS has sent me the new prop C3 X 12.5 X 14 ALcup 3bl with slight cupping. Remember this is to replace a 12 1/4 x 15 I'm waiting for a reply from them as to what the difference will be but my first contact with them they told me I couldn't do better than the 12 1/4 x 15 for my hornet so now I'm confused.
any ideas ???? Wade
heh NQ - sorry to highjack this post, and I'm sure I've asked this question previously, but do you have any idea what my MERC elipto 115 HP 2 stroke 2001 model should rev out to. I took it out yesterday and could only get about 5300rpm flat out - trimmed up a fair bit. Into a bit of chop (small) - can't remember the speed, but most likely around the 60kmh mark from memory. 3 adults in the boat + usual crap.
I have a Vengeance SS prop fitted by the boat manufacturer. Mate said it should rev higher than that - might be over propped. I said I'm happy with it and couldn't be stuffed paying more money to get a few hundred extra rpm. He thought I might be able to swap it though for not much outlay. with who - I'm not sure
My 115 merc 90 m0del is only aboy that
5400 is what the manual said
cheers
blaze
Woody, sorry I misssed this post before, how did the new prop go? Did they tell the truth on your first contact?nq
Cooky was that your usuall heavey load -if so then yes you are running with the hand brake on.
Blaze did you go anywhere with the prop calc you posted about?
not at this point NQ
Not sure he is running with the brake on, would check with dealer in relation to revs at wot as my service manual said it is to be between 4750 and 5260
cheers
blaze
The choice is yours a few hundred for a new prop or possibly a few thousand more for the motorOriginally Posted by cooky
First you need to actually find out what the WOT RPM should be (do't you have a manual?) and being a 2S prop accordingly to achieve the top end plus. Revs never hurt a 2S but lack of them certainly will.
Cheers, Kerry.
Hi Blaze hope it is warm down there, it is up here
Those numbers in the manual represent meeting ONLY the governmental requirement to standardise HP output over all manufacturers, they hold in total no relationship to real world operating RPM - trust me on this.
The fact that manufacturers see more parts sales over an engine's corrosion lifetime also counts as to why they are not unhappy with printing those numbers. They willnot kill an engine within the warrenty period in 99% of cases.
Things were a bit wild in the US 20+ odd years ago with manufacurers deliberatly underrating an engines HP so that their 115hp sticker model blew away a 115hp sticker competitors engine. Of coarse everyone then bought the fast brand and that colour brand got a nice fat dose of cudos at the cash register. This was rife between brands.
Your engine on a dyno makes 115hp (+-10%) by regulation at the prop somewhere within that RPM range straight out of the box and may make 125hp+ at 6000rpm if proped to do so.
Once sold and therefore outside of the regs those numbers can only be viewed as bullshit that will harm and cost money in operating costs like fuel (without doubt) and lugging related repairs sooner or later (some get way with it for a 1000hours but rec engines proped well can go 5000+ commonly, if also decarboned everynow and then). cheers nq
PS got a pretty cool prop calc (.xls) on disk. let me know if you want it.
I'm a bit confused. How does the potential for my boat not reving out to 5500 or whatever (couple hundred rpm) damage my motor to the degree of thousands?few hundred for a new prop or possibly a few thousand more for the motor
I'm assuming your going to tell me it's like operating in too high a gear in your car or running too high a diff ratio. I just can't see this really damaging a boat engine in rec operating conditions. It pops up onto the plane well and seems to do everything else well / easy.
If it will really make a noticeable difference in my normal operating conditions I might consider it. Particularly if more speed (I like speed).
Yes I do have the manual, but I'm a bloke (haven't looked at it)
Woody was your original prop also a Solas?
Cooky, That's what manuals are forreading, highly recommended [smiley=2thumbsup.gif]
Outboards simply have to Rev to max WOT and prefereably the top end (plus) of the rev range. The wrong propellor for the conditions puts a lot of stress on an outboard and more revs are always better then not enough.
Forget this speed thing, speed has absolutely nothing to do with considering props with regards WOT specifications. Speed is a very short sided consideration in this regard, it's not important and when setup correctly if there a few mph drop then so bit it but generally fuel consumption normally improves even with an increase in revs.
Cheers, Kerry.
Posting Permissions
Reply With Quote
