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Old 29 May 2013, 14:25   #11
AJ.
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I thought that..but I wonder if that was just a justification...let's be real..it's never going on the back of his boat...

Comment was passed this afternoon he should just sell it and get a ss for some sib action.
It's virtually new with all the replacement parts! Actually I am sticking it on the RC not this but next weekend so shove that up your tailpipe with the potato!!
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Old 30 May 2013, 06:03   #12
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Cheers Sam, are you around this Sat?
I'm not Saturday. I am Sunday and next week.
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Old 30 May 2013, 10:49   #13
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How much are these hour/tacho things?
AJ, big difference between pottering around and aux use. Both Hardline hour/tach or tach alone costs $35.00 US. What like much better than same Tiny Tach equivalent is that Hardline uses just one pick up standard cable, can be trimmed to size when engine has been finally cable routed as needed, does not use a ground wire and tach is smaller in size.

Tiny Tach uses 2 cables, pick up & ground, both joins at a soldered connector, the solid red pick up cable tends to break with engine vibration at connector's end. Other down issue is that will need to wrapp several rounds of left over cable inside engine once tach & pick up cable is routed. If trimmed to size to avoid wrapping, will need to redo the whole soldering process to match same as when factory delivered.

Happy Boating
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Old 30 May 2013, 11:07   #14
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AJ, big difference between pottering around and aux use. Both Hardline hour/tach or tach alone costs $35.00 US. What like much better than same Tiny Tach equivalent is that Hardline uses just one pick up standard cable, can be trimmed to size when engine has been finally cable routed as needed, does not use a ground wire and tach is smaller in size.

Tiny Tach uses 2 cables, pick up & ground, both joins at a soldered connector, the solid red pick up cable tends to break with engine vibration at connector's end. Other down issue is that will need to wrapp several rounds of left over cable inside engine once tach & pick up cable is routed. If trimmed to size to avoid wrapping, will need to redo the whole soldering process to match same as when factory delivered.

Happy Boating
Hi Loco,

Thanks for the explanation i have borrowed a Tiny Tach of Samt (thanks) and will be testing this weekend on flat water with me on my own and then with a friend. Will publish results for those that are interested
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Old 31 May 2013, 12:16   #15
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AJ,

Post wot results, I'm a firm believer every portable motor should have one installed as standard delivered props used in light inflatables could be slight over reving at wot and boater not knowing anything about it. It's perfect for optimizing boat engine needs to perform inside safe wot parameters.

My 18 horse with me alone on flat no wind waters is achieving top 5800 from max stated 5800, confidently screaming safely with standard prop inside 5300-5800 rpm.

Happy Boating
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Old 01 June 2013, 09:43   #16
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Hi Loco et al.,

Took the Sib out today with the recently bought 7.5 prop measured the below:

1 Man:
Tickover 1480
In gear 1280
WOT 5990

2 Man:
Tickover 1540
In gear 1330
WOT 4720

No matter high hard we tried we could not get it to plane with 2 people, SIB (Airdeck) was inflated to correct pressures.

With one of us no problems but it wasn't as fast with this prop, so clearly the old prop that had been filed down was over revving the engine. Although not as much fun for the engines sake I will stick with this one
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Old 03 June 2013, 13:39   #17
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The 1-2 man test was using the new prop, right ? Just for the record, did you tried same test with old prop and 1 man to check wot numbers ? So this test confirms that standard delivered props on light weight inflatables achieves near 100% of it's max factory stated wot parameters.

The issue about not achieving full plane with 2, probably just fast displacement speeds with lower rpm it's due to the fact that sib is too short, hull has too much water drag for engine to overcome fast. Same engine will perform much better on a 330 & larger size sib. That's why you should never buy a sib less than a 320 size..

Happy Boating
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Old 03 June 2013, 14:48   #18
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Would the following statements be correct?

1, If it's a long shaft then the sib bow will want to go up instead of plane so the sib won't be moving fast enough for the outboard to pick up the revs and its gripping better than the smaller prop.

2, If you use the smaller prop it is slipping more in the water and picking up more revs

3, If you had the same engine but a short shaft then you would find that it would probably get up on the plane with the larger prop.

4, If you did buy a short shaft and trim it out when using it as an aux you would probably find that you would circulate enough water around the transom for it to be used as an aux however it would be less efficient than the long shaft... That's if it was long enough so that enough of the leg was in the water?
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Old 03 June 2013, 16:00   #19
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To get across whispers well made points:

Loose some weight tubbs, get a decent sib, stop faffing with a long a shaft and get decent engine. Clear? Good....
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Old 03 June 2013, 16:06   #20
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To get across whispers well made points:

Loose some weight tubbs, get a decent sib, stop faffing with a long a shaft and get decent engine. Clear? Good....
Don't sit on the fence Peter
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