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Old 10-10-2007, 10:46 PM   #1
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Advice on Props Please

Chaps,
I'm going to get a new prop for the Puma Cat, been told a 26 or 28 inch pitch but whats best. a cleaver, semi cleaver, chopper, Laser II, Big ear chopper, Mirrage??????????

Please help

Mega confussed of Hampshire

P.S Northern Rock Shares went up 30% today
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Old 10-10-2007, 10:59 PM   #2
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Nobodies gonna really know - it's a one off in number of ways that will make it difficult to suggest. FWIW, you could go worse than trying a bravo 1 - but that's a stab in the dark.
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Old 10-10-2007, 11:01 PM   #3
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Thanks for the stab in the dark Matt

its an absolute minefield might end up getting one of each.......
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Old 10-10-2007, 11:22 PM   #4
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Having just seen a prev post from J.F it seens even more of a darker (Ethnic) art than I first thought, might have some props for sale in a few weeks time....
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Old 10-10-2007, 11:40 PM   #5
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Think ya really have to run it with what you have to get an idea first, the fact that its on a LH rotation will cut down a lot of the loan options that could possibly be tried out. 26 or 28 sounds about right but until the water is wizzing over the paddle wheel ???????? tiz all guesswork.

When making a series of test runs to compare props, use the same marks, same course, conditions if possible & the fuel load can effect. make sure you note it all down as that mush between the ears can play some short term tricks by the time you get back in. Just thinking a four blade, that size boat, single engine & intended use, mmmmmhh nah .........try it first
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Old 10-10-2007, 11:46 PM   #6
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John,
firstly thanks for the advice, secondly yesterday i bought £2000 worth of northern rock shares and yes they did go up by 30% so dont pay your loan back just yet

I will give each a try think im going to buy one of each any way then sell the ones that dont work, God bless ebay it could well be my saviour
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Old 10-10-2007, 11:52 PM   #7
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Dont forget a single LH is harder to get rid of, limited market, dont put too many on the shelf

EEEk 23:53 early shout TTFN
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Old 11-10-2007, 12:34 PM   #8
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Ive got a LH 28" Bravo 1.
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Old 11-10-2007, 10:47 PM   #9
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Mr Davis



Is is a 3 blade or 4 blade?
and how much do you want for it Tony?

Have you seen the boat yet at Drivers?????

Martin
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Old 11-10-2007, 10:49 PM   #10
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Errrrr, bravo 1's are 4 bladers.
And everyone's seen the boat.
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Old 11-10-2007, 10:54 PM   #11
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Matt

ERMMMMMMMMMMMMMMMMM

I Know That!!!!!!!!!!!!!!!!!




(Now)

Thanks for telling me........................
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Old 11-10-2007, 10:56 PM   #12
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Here you go:
http://sites.mercurymarine.com/porta..._schema=PORTAL
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Old 11-10-2007, 11:00 PM   #13
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Matt how about a Spinelli what do you think of those???
or A Ron Hill Chopper??
Was also looking at a Maximus 30P

So much choise

as ive said before if you need a lawyer "the first hafl hour is free" then I charge
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Old 11-10-2007, 11:18 PM   #14
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Likewise the 1st half hour of my time is free and you're imminently running out. Shall I send you my paypal details?

Honestly, no.
IMVHO (And I'm happy to stand corrected) a spinelli cleaver would be completely the wrong prop. I doubt it'd get on the plane.
A maximus is a 5 blader. Could work, but 5 blades is slower than 4 is slower than 3. It seems to be the other end of the scale to the spinelli.

The bravo suggestion is based on it being a middle of the road prop. You'll learn a lot about what direction to move in by trying it because it's middle of the road, wherease trying a prop at the extreme of the spectrum won't teach you anything because you can only move 1 way for your next choice. And you stand a "fair" chance of it working. What ratio box is it? I reckon you might need to drop down on pitch a bit to start and work upwards once you know what works well. (Someone else can do the sums to validate)


Surely hutchy should help you with a few different props to try?
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Old 11-10-2007, 11:20 PM   #15
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What lower unit ratio is the 300? what maximum RPM?

I have a Mirage Plus 29 (LH) you could try, but it will be pointless if it's too tall. hence the questions above.

I'd take a wild guess at 70-75mph so we could work backwards from there.
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Old 11-10-2007, 11:23 PM   #16
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Oh bollix, I'm about to be exposed as a fraud. From now on I shall be known as Miss South Carolina.

Quote:
Originally Posted by Jon Fuller View Post
What lower unit ratio is the 300? what maximum RPM?
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Old 12-10-2007, 06:51 AM   #17
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Thanks Jon & Matt

How do i find out the answers to your questions? is the info stamped on the unit somewhere??

Martin

Matt, if I pay using Paypal do you give Nectar Points?
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Old 12-10-2007, 07:52 AM   #18
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Gearbox ratio was 1.62 on my 300 promax and rev limiter was at 6200.
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Old 12-10-2007, 01:20 PM   #19
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Quote:
Originally Posted by Pash 1 View Post
How do i find out the answers to your questions? is the info stamped on the unit somewhere??

Pull the plugs unless you eat lots of spinach.
Dab a mark on the propshaft & the housing (inline or tear some masking tape & mark two alingment marks with a pen)
Turn the engine over by hand 2 revoloutions:
depending what ya get is what ya got only takes but a few mins

2 motor 1 on the prop 2:1
2 motor 1 & 3/4 on the shaft 1.75
ect, ect,ect
easy to eyeball the diff between 1.62 & the other two


FWIW I love Spinelli 's got 3 away being hubbed as I type careful with the Ron Hill as there are lot of fakes in the market. not as strong & prone to blade flexing which the genuine isn't, they come up on US ebay a lot.
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Old 12-10-2007, 03:52 PM   #20
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Got a Pair of Spinelli's you fancy trying the R.H. One????

Blue Line?????
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