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Old 02 July 2007, 06:41   #11
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Length: 5m +
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Originally Posted by IBWET View Post
How did it perform? the prop i've got is 3 blader 25" which seems fine at top speed but gives me the impression that it is slipping on pick up from standstill (also DF150).

I'm now thinking about trying a 4 blader, was your supplier any good (knowledgable)......

Anyway good you've solved your problem.
Iain.
I have not tried it out yet, will do so in a couple of weeks and report back. Supplier was Steel Developments...
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Old 16 July 2007, 04:07   #12
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Update:
Suzuki SS 15X21 on 6.5m Rib X: max revs ~6200rpm 48mph (gps)

Changes for Solas 14.75X23: max revs 5800rpm 50mph (gps) no noticable loss of acceleration, there does seem some slippage but not much different than before - I am taking "slippage" as the prop doing a car's version of wheelspin before it fully grips ?

Cruise at 32mph @ 4000rpm.
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Old 17 July 2007, 03:01   #13
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Quote:
Originally Posted by TNDB View Post
Update:
Suzuki SS 15X21 on 6.5m Rib X: max revs ~6200rpm 48mph (gps)

Changes for Solas 14.75X23: max revs 5800rpm 50mph (gps) no noticable loss of acceleration, there does seem some slippage but not much different than before - I am taking "slippage" as the prop doing a car's version of wheelspin before it fully grips ?

Cruise at 32mph @ 4000rpm.
Yea I get that quite a lot on my set up, mostly because the cav plate is 3-4 inches above the bottom of the hull, which is where it needs to be for my type of rig, otherwise I wont get the top end speed and revs, that the motor is capable of giving. I just feather the throttle for rapid get aways and live with it.
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Old 17 July 2007, 05:20   #14
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Originally Posted by Bigmuz7 View Post
Yea I get that quite a lot on my set up, mostly because the cav plate is 3-4 inches above the bottom of the hull, which is where it needs to be for my type of rig, otherwise I wont get the top end speed and revs, that the motor is capable of giving. I just feather the throttle for rapid get aways and live with it.
With the length of that rib I would have thought a a huge fender strapped to the bow,would help you avoid hitting the cumbrae leaving the marina.

I have a new four blader coming so I'll see what difference it makes and let all know.
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Old 17 July 2007, 18:56   #15
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At last!

Got the new blingery today. ("Back order" from Suzuki spares depot. Fer cryin' out loud, Suzuki GB - whole species have evolved and become extinct in less time. )
Very shiny, so decided it needed a dunk in the oggin.
Whipped off old dinged alu, put on shiny new steel.
Why do the splines stick out so far now?

Prise final spacer off old prop, put back on drive shaft, torque down, put pin in; lift boat off sand, reverse out into Lamlash Bay.

Trundle through moorings - at 1000rpm we seem to be up from 3.5kts to 4kts. OK so far.

Outside moorings - 2000rpm, 3000rpm up we go; a lot smoother with the new prop. Keep on accelerating - now at 4500-4600rpm we're doing about 25kts almost fully trimmed out. This is better; before we'd be at ~5k. Looking good for the fuel bill.

However...

...the engine still tops out at an indicated 6200rpm (just over the normal range), and whereas on Sunday I managed 33kts solo with full tanks, tonight we got a heady 33.4kts. OK, Mrs. G. was gracing the Nav. seat, but she's not exactly what you might call hefty.

Perhaps I should've gone for a 22" pitch rather than a 20". Oh well, it'll have to wait for another day...
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Old 17 July 2007, 19:28   #16
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Quote:
Originally Posted by The Grocer View Post
Got the new blingery today. ("Back order" from Suzuki spares depot. Fer cryin' out loud, Suzuki GB - whole species have evolved and become extinct in less time. )
Very shiny, so decided it needed a dunk in the oggin.
Whipped off old dinged alu, put on shiny new steel.
Why do the splines stick out so far now?

Prise final spacer off old prop, put back on drive shaft, torque down, put pin in; lift boat off sand, reverse out into Lamlash Bay.

Trundle through moorings - at 1000rpm we seem to be up from 3.5kts to 4kts. OK so far.

Outside moorings - 2000rpm, 3000rpm up we go; a lot smoother with the new prop. Keep on accelerating - now at 4500-4600rpm we're doing about 25kts almost fully trimmed out. This is better; before we'd be at ~5k. Looking good for the fuel bill.

However...

...the engine still tops out at an indicated 6200rpm (just over the normal range), and whereas on Sunday I managed 33kts solo with full tanks, tonight we got a heady 33.4kts. OK, Mrs. G. was gracing the Nav. seat, but she's not exactly what you might call hefty.

Perhaps I should've gone for a 22" pitch rather than a 20". Oh well, it'll have to wait for another day...
Russell,

My sook's rev limiter is at that speed (6,200),it's not bouncing on the rev limiter is it? 500 rpm less at the mid range same top end? now this is a guess but could it be the slip thats your problem at higher RPM? going up in dia instead of pitch might be the answer.

Oops..shiny new prop for sale next to the corny's
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Old 19 July 2007, 19:32   #17
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Sorry I've not been in touch about the trip. I did contact RNLI Scotland, and they failed to get back to me. I even Made up a sponsor sheet, but unfortunatley work commitments have overtaken...Still keen to do the trip, but it might have to wait a wee bit.

Cheers
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