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Old 13 July 2012, 07:27   #11
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Quote:
Originally Posted by Dry Run View Post
Here's a pic of a 2008 "MOD Spec" SR 5.4. It looks to me that the inner port spray rail is more flered than the starboard one (albeit in a different way to the OP's)?
OMG I want... no wait I NEED that propellor
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Old 13 July 2012, 09:47   #12
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Quote:
Originally Posted by johndoe007

OMG I want... no wait I NEED that propellor
One of those might give you a better hole shot! Wait, that's another thread....
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Old 13 July 2012, 10:15   #13
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Quote:
Originally Posted by johndoe007 View Post
OMG I want... no wait I NEED that propellor
Well, if you've got Ģ25k burning a hole in your pocket you can have the propellor along with the rest of the boat!
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Old 13 July 2012, 11:05   #14
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Thanks Dry Run for the picture! Nice SR! Maybe the design have developed during the years(mine is 1992) but now I am convised that it is a feature rather than a bug on navy spec/MOD versions. The story behind this assymetrical shape would be interested to know, but sure there is a reason. Think will leave the angle grinder in the tool box until further notice.
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Old 13 July 2012, 12:09   #15
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This is intentional and is seen on all the 5.4's, I think it was to try and counteract the chinewalk you get on them at high speeds.
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Old 13 July 2012, 12:12   #16
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I think I've seen this on a few Avon hulls ...I'll check mine for 'straighness' later !
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Old 13 July 2012, 21:48   #17
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I have my hands full over here, but if you thinking of parting her out I'll take the roll over / righting kit and the prop
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Old 23 July 2012, 20:45   #18
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Hi...

it is the same on my SR5.4 was also worried when I saw it first... then I checked some pics on ribnet and I found it on all the pics.
I think it was the shape of the mould.
Donīt worry .....ride it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

cheers
Sven
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Old 24 July 2012, 03:37   #19
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I noticed this contour on my 5.4 when I re-gelcoated the hull. At first I thought it was a bad repair (along with all the others...) but then realised it must have been a feature of the original mould.
It would tend to give the port side a slight lift which might be to counteract the torque of the prop.... then again my mate said I was spending too much time thinking and not enough sanding!
Who wants to grind theirs off and let us know the difference?
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Old 11 August 2012, 12:46   #20
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later on I re checked how straight the hull is. I was wrong, the planning surfaces are not straight as i wrongly said earlier.....In fact there are some hook in the whole planning surface, worst area located pretty close to the transom.

I don't know is it due to tired mould, wrong way of storage or another design feature.

Anyway decided to take it a way. I filled it with lightweight epoxy filler, guess as worst it was like a 3-4 mm hook. I did only the flat surfaces, spray rails left undone at this stage.

Result was interesting. Wot/ high speed handling is better, reduced tendency for chine walking. Also the propeller grip seams to be better. But lost top speed about 0,8 knots, now slightly less than 39. RPM is about the same, 5500(not 100% sure but think it was close to that also before)

I guess loss of wot speed is due to the engine is kind of "lower" (rig doing more resistance than before) as the water now goes straight, as in the past it was directed "down" due to the hook.

Will lift the engine a hole or two to check how that will work. Will let You know the results.
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