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Old 07 August 2011, 10:55   #11
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Country: Sweden
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Ah nice install there Chris, that was just like I imagined, except I thought I'd place it on the cover! But that's more clever so the cover wont be attached to the engine with a wire. Really cheap tach there! Cheapest in sweden is 40..
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Old 07 August 2011, 15:23   #12
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Quote:
Originally Posted by Fenlander View Post
I have a laser rev counter for tuning at home in the tank and on the water for a one-off check with a helper. Will use it on this year's hols to check out my prop sizing. Obviously you have to do a few runs with the cowl off so it's not as user-freindly as the TinyTach.

Could be useful for some folks though and only a tenner.

Digital Laser Photo Tachometer Non Contact RPM Tach | eBay
If I use one of these, how do I measure? I mean I have to measure with the propeller in the water, otherwise I suppose it's meaningless...
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Old 07 August 2011, 16:01   #13
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Country: UK - England
Town: East Anglia
Boat name: Nimrod II
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The laser tach will measure anything that turns or spins. Many things will give a good reading by themselves but they do supply small reflective strips (sticky back) to put on any surface that doesn't give a good return on the laser.

On an outboard you just leave the cowl off and take the reading from the spinning flywheel. It will do it from a metre away so quite safe. You do really need an assistant when out on the water.
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Old 07 August 2011, 16:08   #14
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Ah so it is that simple... Yeah that's no problem, I can have someone sit beside me. So the flywheel goes in the same speed as the prop? There's no gearing going on?
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Old 07 August 2011, 16:13   #15
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Country: UK - England
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There is gearing at the lower unit... usually around 2:1 for a 10-20hp. But it's not prop speed you want to know... it's the engine flywheel speed for the engine RPM.
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Old 07 August 2011, 16:27   #16
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Oh okay, really good to know! Wish I would have taken care of this business earlier, now I have already taken a chance and bought a new prop with the world's longest delivery time. Perhaps you have some ideas of firms in the UK that sells props cheaply? I'd like aftermarket props, anything to get them as cheap as possible. Solas or something was the name of the one I ordered. Extremely expensive in Sweden, just as everything else...
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Old 07 August 2011, 18:05   #17
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Country: UK - England
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Boat name: Nimrod II
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Not sure what you call cheap but these are the folks many of us deal with...

Steel Developments - New Propellers & Propeller Repairs - UK Wide Delivery _ New propellers available from stock & prop repairs in very quick lead times

I've a spare new prop on the way from them at the moment.
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Old 07 August 2011, 18:30   #18
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I'm sending them a mail asking for international delivery.. I see that you have got 20% VAT, has it been increased lately or has it always been that much? (we have got 25% in sweden since 30 years or something)
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Old 07 August 2011, 18:32   #19
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Country: UK - England
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Boat name: Nimrod II
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Length: 3m +
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Posts: 3,276
Yep VAT was 15% a couple of years ago, then 17.5% and now 20%.
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