Re: BASS STRAIT CROSSING - MARCH 2016
Posted: Mon Nov 16, 2015 10:52 pm
First test on the water. Boat as is with cracked paint and rough hull all untouched for 10 years or so.
Launched in Daniels Bay Monday 16 November in perfect weather and flat calm (at least to start)
Tried out both long and standard shaft WSPC'S mounted side by side. As per the photo attached
Both motors ran independently at full throttle both achieved 4.8 to 4.9 average speed by GPS.
Next ran both together again at full throttle and gained a further 0.5 knots to 5.4, not great for double the fuel consumption but sounded good.
The Displacement maximum for the boat, using the standard 1.4 rule in flat water gives 5.37 knots so was spot on the money.
Next motored her back to my boat landing a distance of 8.3nm. and to start, crossed the bay with the long shaft only, we reached the Ventenat north cardinal mark a distance of 2.14 nm at an average speed of 4.28 knots. Rounding Ventenat and out in the channel for the run South we were out of the lee and into stiff sea breezes which were kicking up steep short breaking waves. Under these conditions the speed dropped away
The total time for the 8.3nm was 2hours and 15 minutes at an average of 3.69 knots.
The exact fuel consumption was 4.5 litres at 2 litres per hour.
Based on these figures crossing the Bass Striate will take 44 hours with a fuel load of 88 litres. (plus reserve)
The next stage is to finesse the engine mounts, making sure the standby motor is clear of the water and that the driving motor has the prop at the correct depth.
Sort out the steering and seating positions to optimise trim
Provide a high gloss finish to the hull to reduce the HP required to reach hull speed and improve the overall averages.
As the waves yesterday were very short and steep they were not really representative of the Bass Striate except for the entrance to Port Philip so we can be reasonably confident that an average of 4 knots can be achieved over the whole distance.
As for the Name please make your suggestions we have a fair list at present..
Launched in Daniels Bay Monday 16 November in perfect weather and flat calm (at least to start)
Tried out both long and standard shaft WSPC'S mounted side by side. As per the photo attached
Both motors ran independently at full throttle both achieved 4.8 to 4.9 average speed by GPS.
Next ran both together again at full throttle and gained a further 0.5 knots to 5.4, not great for double the fuel consumption but sounded good.
The Displacement maximum for the boat, using the standard 1.4 rule in flat water gives 5.37 knots so was spot on the money.
Next motored her back to my boat landing a distance of 8.3nm. and to start, crossed the bay with the long shaft only, we reached the Ventenat north cardinal mark a distance of 2.14 nm at an average speed of 4.28 knots. Rounding Ventenat and out in the channel for the run South we were out of the lee and into stiff sea breezes which were kicking up steep short breaking waves. Under these conditions the speed dropped away
The total time for the 8.3nm was 2hours and 15 minutes at an average of 3.69 knots.
The exact fuel consumption was 4.5 litres at 2 litres per hour.
Based on these figures crossing the Bass Striate will take 44 hours with a fuel load of 88 litres. (plus reserve)
The next stage is to finesse the engine mounts, making sure the standby motor is clear of the water and that the driving motor has the prop at the correct depth.
Sort out the steering and seating positions to optimise trim
Provide a high gloss finish to the hull to reduce the HP required to reach hull speed and improve the overall averages.
As the waves yesterday were very short and steep they were not really representative of the Bass Striate except for the entrance to Port Philip so we can be reasonably confident that an average of 4 knots can be achieved over the whole distance.
As for the Name please make your suggestions we have a fair list at present..