Hi all,
New to the forum but have been reading lots.
I just purchase a new to me boat and find that it doesn't have the hole shot power of my old boat. (1983 Campion 16 ft closed bow powered by a 140hp 2stroke Evinrude)
Here are the facts required by hwiii:
Iboats Boat and Motor Info
1. Year, make and model of boat
1993 Fourwinns 190
2. Length, width and base weight of boat, look for boat decal on back of boat
length=20'2",beam= 7'4", keel to w/s shelf=52"; boat & engine weight=3060lbs
2a.What is the recommended HP for your boat
3. Number of people and gallons of gas normally on boat
3 adults, 25-35gal
4. What do you use the boat for
skiing, knee boarding, tubing,& pleasure riding.
5. Is it a Deep Vee and if so how many degrees of deadrise
Deadrise=19 degrees
6. Year, make. manufacturer and model of motor
1993 OMC Cobra 5.0l EFI
7. HP and gear ratio of motor IMPORTANT
215hp; 1.59:1
8. Manufacturer?s recommended Wide Open Throttle (WOT) range
4200-4600rpm
9. Anti-ventilation Plate height above keel of boat if it is an outboard in inches
10. Is it a bass boat or does it have a pad bottom
11. Does it have a hydrafoil, dolefin or trim tabs
nil
12. Make, model, diameter, pitch and whether SS or aluminum prop
OMC Raker SS, P/N 394752, 14.5 X 18 X 3
13. WOT RPM and speed from your current prop and how much gas and how many people were in the boat for the test data and is the speed by GPS.
4500WOT RPM; 42mph (not GPS);3/4 tank=~26gals; two adults=370lbs
14. Are you at sea level or a higher elevation, give us the elevation in feet
1000ft elev.
15. Has your motor been tuned up lately and have you checked that the carburetor butterfly is opening all the way, checked compression, and looked at the plugs and checked spark, all of the foregoing could be the reason your prop is not attaining full RPM
spring tune-up complete (plugs, wires, oil)
16. How long has this prop been on the boat and why, at this time, do you think it is the wrong prop
since new and require faster hole-shot.
17. Does the prop show any damage that you can see
nil
18. What problems are you trying to cure or what are you looking for the boat to do that it is not doing the way you think it should or to your expectations
faster hole shot for skiing, wake boarding.
19. If you are trying to attain a better cruising speed and fuel savings or trying to attain a faster speed I will want you to take your boat and run it with 1 or 2 people and give me the RPM and speed readings starting at 3,000 RPM in 500 RPM increments all the way to WOT.
From what I read here on the forum, it appears that I would go down one pitch to a four blade: 14 1/4 X 17 as my rpms are in the good range.
What four blade would I choose? or am I totally wrong here with my sizing?
Thanks,
Dean
New to the forum but have been reading lots.
I just purchase a new to me boat and find that it doesn't have the hole shot power of my old boat. (1983 Campion 16 ft closed bow powered by a 140hp 2stroke Evinrude)
Here are the facts required by hwiii:
Iboats Boat and Motor Info
1. Year, make and model of boat
1993 Fourwinns 190
2. Length, width and base weight of boat, look for boat decal on back of boat
length=20'2",beam= 7'4", keel to w/s shelf=52"; boat & engine weight=3060lbs
2a.What is the recommended HP for your boat
3. Number of people and gallons of gas normally on boat
3 adults, 25-35gal
4. What do you use the boat for
skiing, knee boarding, tubing,& pleasure riding.
5. Is it a Deep Vee and if so how many degrees of deadrise
Deadrise=19 degrees
6. Year, make. manufacturer and model of motor
1993 OMC Cobra 5.0l EFI
7. HP and gear ratio of motor IMPORTANT
215hp; 1.59:1
8. Manufacturer?s recommended Wide Open Throttle (WOT) range
4200-4600rpm
9. Anti-ventilation Plate height above keel of boat if it is an outboard in inches
10. Is it a bass boat or does it have a pad bottom
11. Does it have a hydrafoil, dolefin or trim tabs
nil
12. Make, model, diameter, pitch and whether SS or aluminum prop
OMC Raker SS, P/N 394752, 14.5 X 18 X 3
13. WOT RPM and speed from your current prop and how much gas and how many people were in the boat for the test data and is the speed by GPS.
4500WOT RPM; 42mph (not GPS);3/4 tank=~26gals; two adults=370lbs
14. Are you at sea level or a higher elevation, give us the elevation in feet
1000ft elev.
15. Has your motor been tuned up lately and have you checked that the carburetor butterfly is opening all the way, checked compression, and looked at the plugs and checked spark, all of the foregoing could be the reason your prop is not attaining full RPM
spring tune-up complete (plugs, wires, oil)
16. How long has this prop been on the boat and why, at this time, do you think it is the wrong prop
since new and require faster hole-shot.
17. Does the prop show any damage that you can see
nil
18. What problems are you trying to cure or what are you looking for the boat to do that it is not doing the way you think it should or to your expectations
faster hole shot for skiing, wake boarding.
19. If you are trying to attain a better cruising speed and fuel savings or trying to attain a faster speed I will want you to take your boat and run it with 1 or 2 people and give me the RPM and speed readings starting at 3,000 RPM in 500 RPM increments all the way to WOT.
From what I read here on the forum, it appears that I would go down one pitch to a four blade: 14 1/4 X 17 as my rpms are in the good range.
What four blade would I choose? or am I totally wrong here with my sizing?
Thanks,
Dean
