Delta Project - part 2

[gohelm]

Hi

The cavitation plate is paralel with the keel line, however the v is less deep the last 40 cm of the hull. So yes it looks , compared to the transom , too deep (but not with the hull....) however the balance in the hull changes a lot in turns so hence we went for ' safe' . Thanks for suggestion though.

[gohelm]

Originally Posted by Oscarguitar

Sorry another thought, a stern lifting prop such as a 4 blade Rev 4 could also make a big difference to the trim and allow you to plane easier and at lower speed.

Will investigate this...thanks!

[gohelm]

Some progress on 2nd jockey, the hatches and bilge system...(pump is below decks and can handle small bits and leaves;-)). The handles on the backrests are modified and also allow people in excess of 1.75 m to use them.

We are considering a jack plate for the engine, however not sure yet whether worthe the investment (still need to do some tube upgrading as well, which may have priority)

[gohelm]

New place for the plotter - to be continued!

[gohelm]

Finished jockey and newly powdercoated a frame....

[Rokraider]

Does the different hull shape at the stern where the Hamilton was, make much difference to handling now it has an outboard? I have a BWM Deep Sea 21 with a Castoldi jet and a Porter 6500 Renegade (Same hull) with an outboard. There is a big difference between the two at the stern.
Not having the Vee running all the way to the stern must make some difference? I was wondering whether this is contributing to it running bow high? You must have lost a lot of weight overall losing the jet , inboard and associated parts, so presumably the hull is sitting higher in the water now?
Presumably it wouldn't be too difficult to fabricate a Vee shaped box under the stern to continue the vee all the way back?

[gohelm]

Originally Posted by Rokraider

Does the different hull shape at the stern where the Hamilton was, make much difference to handling now it has an outboard?

The boat is only missing less than 1 meter of Vee at the stern (about 10 cm), but yes,
the pivot point is more forward than the 7.4X I had as comparison.
Since the overall performance improved so much by the outboard (more than 30 percent on ALL performance) i feel that I am a bit comparing apples and eggs with regards to the shape of the hull vs performance.
Negotiating waves at all speeds is not really different than the 7.4x, nor do i notice any difference in 'landing' after being airborne in the conditions we use the boat in (mainly on the IJsselmeer, which is a bit like the solent but fresh and a bit shorter waves). In large waves + windspeed in excess of 25 knots the bow seems to be a bit lighter when going against wind/waves but this is also going 10 knots faster than in the old situation.

A friend of mine is a naval architect and after some 'quality pubtime' on the issues of changing the inboard to an outboard.
The boat is now about 250 kg lighter now and yes she sits a bit higher in the water but that is 2,5 cm tops at the bow and only a littlebit at the stern so definately the center of gravity moved backwards from the situation with the inboard/hamilton (actually more than we expected , a hamilton apparently is much heavier due the water in it which we didnt consider at first) .

The missing vee is about 7 dm3 additional volume, i.e. 7 liters additional buoyancy in static/sub planing conditions and this effect - we reckon - is much smaller than the movement of the center of gravity . Unfortunately my nautical architect friend hasn't had the time to make any CFD calculations ;-)

We decided (the cheap Dutch solution yes) to play it by ear for how it goes with a planing boat and experiment with the ballasting of the bow instead. If not satisfied by ballasting the bow in the middle of the season i think I will get out the rubber gloves, resin, glass etcetera again and start working on a box at the stern to continue the vee all the way back to the stern.

[gohelm]

New upholstery.......now working on electronics.

[gohelm]

Inner side of tubes redone by hobson in Amsterdam (h.i.b.s.) who also did the outer side already - not unhappy withe the result ;-)

Anyone any suggestions for a harmless way of getting the green stuff off the remaining bit orange tubes? i am really relucant to use any agressive chemicals on the tubes....afraid they end up pink or worse!

Doing scrolling in previous posts , since reckon there will be a few, but in the meantime any suggestions are welcomed!

[gohelm]

Installing 2nd pod

[gohelm]

Backrests with raised grip so people longer than 1.80 m can stand without the risk of back injury