Help with Propulsion

Sea Trial 1
https://www.youtube.com/shorts/yxVm_3SqhOI
Sea Trial 2


Failed my speed target. Although enough speed as per requirement. 2nd time I ordered from this prop maker and 2 fails...... SIGH

 

You had mentioned this in your original post -
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Power will be from twin 360HP 2200 RPM Diesel
ZF V drive 2.06:1
Waterline length 45'
draft 2ft
beam at waterline 12'
vessel weight about 13 tons loaded
Target max speed 24 cruising 18 knots
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And she seems to be going along very nicely in your videos, congratulations!
Especially after that huge setback from the storm - that must have been very upsetting (to say the least).

Re your target max speed of 24 knots, what was your maximum speed on the trial?
And is your vessel weight around 13 tonnes as expected?

 

Hi Bajan,
Weight was within 200KGs. Only hit 18.9 Knots but can only go 2100 of the 2400 RPM engine rating which leads me to believe I'm overpropped.

 

what propeller you used on the end?

 

A question
When the boat is turning to starboard, the boat appears to tilt to port. This seems a little unusual.
Any reasons why?

 

28D X 30P 3B
I did make a mistake of telling prop maker of my max RPM which is 2400 amd not 2200 as I thought so we adjusted from 28d x 34.6p to this. I have had it repitched again and now it is 28d x 28P. I hope to do sea trials later

 

Until you pointed it out, I didn't notice. May be a rudder issue. We did make another rudder set with less surface and balancer and hope to do sea trials later.

 

i think you will have cavitation with this 3 blade smal area propeller

 

55% blade area. why'd you think it'll cavitate?

 

see the post 21 picture 3, it says check for cavitation