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Old 29 April 2015, 18:20   #11
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Thanks for the offer. Might just do that if I can get it running a bit better. 4-5 knots isn't much fun but I'm sure it should go better than that.
Going to have a fiddle with the engine as they're probably not to well set up from the factory!
I'll keep you posted!
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Old 29 April 2015, 18:31   #12
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ok cool, send me a pm if you want me to take a look though cant promise i can do much!
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Old 29 April 2015, 18:42   #13
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Ok, will see what I can do in a couple of weeks. I'm away until then. The prop does sound like a possibility though. The engine revs proportionally to the throttle till about just over half then add you wind it further, the induction roar goes up but with very little increase in revs suggesting that it's not getting up into its power band. I know from my 2 stroke motocross days that 2 stroke engines have a fairly narrow power band.
I need to see if I can get my handheld tacho on the crankshaft whilst it's running and see what rpm it's doing.
It sounds a bit like when I get my chain stuck on the chainsaw.
Food for thought indeed. Thanks for the suggestion. I'll be in touch when I get back from my European sales tour!
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Old 29 April 2015, 19:03   #14
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That bogged sound is what you get when an outboard can't make it on the plane. You are right on the crossover HP at 6 for an adult + teen. Weight is crucial with minimal power. There is a big difference in that situation between you being lightish at say 11st plus 7st teen girl... or you being 16st with a rugby playing lad of 14st!!

Would be interesting to try it one up with the lightest of the two of you.
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Old 30 April 2015, 03:15   #15
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As Fenlander says, weight is key - get the lad to sit at the water edge while you try it alone.

The smaller the power of the engine the smaller the weight (that makes the) difference between planing and not planning!

And a tiny tach is only 10 or so on eBay and will tell you the revs very easily.
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Old 30 April 2015, 03:21   #16
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Ah right, I have a hand held tacho but it would mean taking the cowl off the starter. If it's only a tenner or so for a tiny tach, I'll buy one.
I think if I'm going to play with props etc, it's necessary to know the rpm of the engine to see what difference things make.
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Old 30 April 2015, 03:22   #17
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We are based in Chorley, you are welcome to bring the boat to us to check out the valves and pump
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Old 30 April 2015, 03:28   #18
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Thanks Dave, can you send me a PM with your details please? It will be after I get back from my sales trip but would be good to have someone local who can help.
Thinking of buying a good electric pump anyway so hopefully that will come with an adapter that works well.
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Old 30 April 2015, 04:47   #19
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I wonder what make your Chinese outboard is? Do you trust it is making its stated output? If it's nearer 4hp in reality then you'll never plane unless one up with a superlight person.

You didn't respond to my weight comments a few posts above... not meant to be insulting but there's lots of experience on here and if you gave an idea of total weigh of you + passenger then we'd have a better idea of the likelihood you'll ever plane it.
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Old 30 April 2015, 05:12   #20
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Fenlander, The outboard is a Hyfong and at the rpm I'm achieving, it's almost certainly not making 6hp which is why I thought the smaller prop might help. I'm guessing at the moment but I would say I'm not much above 3000rpm at WOT and the engine is rated at max rpm of 6000. A variable pitch prop would be a wonderful thing!!!!


Sorry I didn't respond to the weight, I thought you were just saying "weight makes a difference" I didn't think you were asking for info. No problem though.
The lad is about same height as me but hasn't filled out so I would guess he is about 80kg and I'm around 90kg.
When I had a short run with the missus (75kg) leaning forwards with her up front seemed to increase rpm and speed ever so slightly but it still wasn't planning.

I'm fairly sure one up, it would go OK and I think that the engine just isn't getting into it's power band so to speak.

I'm assuming that a lower pitch prop would allow the engine to rev higher but would reduce the overall top speed once on the plane, am I correct??
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