Fountain 47, 2372cid single engine diesel
#11
I hope you continue to update this build thread on a regular basis.
keep the pictures coming for all the work as it progresses.
this is going to be an awesome project that all of us would like to follow,
and i think it will be successful.
keep the pictures coming for all the work as it progresses.
this is going to be an awesome project that all of us would like to follow,
and i think it will be successful.
#12
Gold Member
Gold Member
It's great to see someone trying something different with such a proven hull. Look forward to reading the updates.
RR
RR
Last edited by rak rua; 01-26-2020 at 07:09 AM.
#13
Registered
Thread Starter
Boat need new transom to fill 3 drive holes and 6 exhaus holes. I need fill notch partially that surface drives can fit.
What you think, is it better fill total or just so low that drives can be mounted?
How about drag and transom lift if I remove notch completely?
There will be more space in engine room if notch is removed. Engine, transmission and crossbox left 4” free space to bilge at lenght direction.
#15
Registered
Last edited by sutphen 30; 01-26-2020 at 10:27 AM.
#16
Registered
Thread Starter
Yes its T-55 tank engine, T-72 and T-90 (latest russian tank) share same engine. T-72 was supercharged 780hp and T-90 1200hp. Tank engines are low power vs diplacement because cooling is big problem without driving cooling air flow and heavy armoring.
max rpm stock is 2000, my P pump governor is set 2500, it start pull fuel of at 2350.
max rpm stock is 2000, my P pump governor is set 2500, it start pull fuel of at 2350.
#17
Registered
iTrader: (5)
Boat need new transom to fill 3 drive holes and 6 exhaus holes. I need fill notch partially that surface drives can fit.
What you think, is it better fill total or just so low that drives can be mounted?
How about drag and transom lift if I remove notch completely?
There will be more space in engine room if notch is removed. Engine, transmission and crossbox left 4” free space to bilge at lenght direction.
What will your propshaft centerline be? 20"?
#18
Registered
Thread Starter
Crossbox is 0.55:1 overdrive and six speed transmission 3.57-0.65:1, but i don't want use 5. and 6. gears. 4. is straight 1:1, it can handle more torque than others, power goes through transmisson by two shaft, other gears just one. power loss is also lower at 4. gear. Propshaft speed is 4360 at 4. gear. My props are Rolla 33x16.5 4 blade, I know diameter should be bigger, but I try these first. So expensive to try and go wrong.
Engine max torque is about 7000-8000Nm, so I think there are no spooling issues
Engine max torque is about 7000-8000Nm, so I think there are no spooling issues
#19
Registered
Thread Starter
Offshorexcursion, you are right, I need bolt drives so close bottom I can. But my question about notch mean notch between drives? It can be there, but is it nesessary?
Centerline can be everything between 17,5"-25", I think closer together is better.
Picture show crossbox water cut plywood modeling piece, you get the idea...
Centerline can be everything between 17,5"-25", I think closer together is better.
Picture show crossbox water cut plywood modeling piece, you get the idea...