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Old 16 August 2014, 11:01   #11
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I will try with another propeller to check if the problem is the prop supplied with the engine.
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Old 17 August 2014, 03:48   #12
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Originally Posted by alystra View Post
I have a Honda BF90D on my 5.3m Humber destroyer. The Honda propeller supplied with the engine was a 19" pitch. It ventilated easily when trimmed up, just like you describe.

I changed to a Honda 21" propeller. This was a little better, but the engine was definately over propped and I could not get maximum revs.

I then fitted a Solas Rubex 3 19" pitch propeller. Problems solved. Max revs. Able to trim up to maximum and rarely get any ventilation.

Hope that helps.
so if the propeller that was with the engine is defected is it the case to contact Honda dealer for a guarantee issue and claim for a replacement of the propeller? what do you think?
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Old 17 August 2014, 05:11   #13
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so if the propeller that was with the engine is defected is it the case to contact Honda dealer for a guarantee issue and claim for a replacement of the propeller? what do you think?
Not defective, just a slightly different design and obviously not suited to my particular boat. The dealer replaced it at no charge. I think engine, boat and propeller have to be matched and you can only tell by testing. The first prop was a 'first best guess'.

My dealer supplies many engines to commercial fish farm boats, which are not all fast RIBs. The original prop may have been more suited to those.

My Honda is the second engine on my boat, the original being a 90 hp Mercury, which I broke. That was supplied by Humber when the boat was built and was well matched. The Solas propeller looks very similar to the Mercury one. It seems to have more 'cupping' and thinner blades than the original Honda one. Perhaps that has made the difference.
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Old 17 August 2014, 11:11   #14
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I was making a search on what causes propeller to ventilate and while I found that something that causes air to enter into the prop I realised that I have the boat leader that keeps submerged and while I am driving it causes a lot of water splash. now I ask if this could cause the prop to ventilate?
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Old 17 August 2014, 11:36   #15
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Click image for larger version

Name:	20140626_165520.jpg
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ID:	97983 Have a look to the ladder and tell me what do you think?
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Old 17 August 2014, 13:48   #16
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Wow, it even planes like that?!
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Old 17 August 2014, 14:42   #17
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Wow, it even planes like that?!
I don't understand what do you mean by your comment??
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Old 17 August 2014, 14:43   #18
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Old 17 August 2014, 14:59   #19
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I don't understand what do you mean by your comment??
Nos is surprised that your boat will even plane with the ladder like that. It's not good & I would look at raising the ladder above the bottom of the hull before spending any money on the prop. The ladder could be the problem.
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Old 17 August 2014, 15:05   #20
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Originally Posted by Jason calleja View Post
I was making a search on what causes propeller to ventilate and while I found that something that causes air to enter into the prop I realised that I have the boat leader that keeps submerged and while I am driving it causes a lot of water splash. now I ask if this could cause the prop to ventilate?
YES!!! It will cause severe turbulance. Remove the ladder and your issue should be gone.

You will probably gain a couple mph top speed too.
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