23 WALKAROUND, Single HONDA 250-HP - Moderated Discussion Areas

  ContinuousWave
  Whaler
  Moderated Discussion Areas
  ContinuousWave: Whaler Performance
  23 WALKAROUND, Single HONDA 250-HP

search | FAQ | profile | register | author help

Author Topic:   23 WALKAROUND, Single HONDA 250-HP

acseatsri posted 04-12-2015 07:44 PM ET (US)
What (fixed hub) propellers will fit [a BF250} V6 Honda outboard? I have someone offering me a 15-1/4 x 17 propeller from a Yamaha 300 HPDI. I also have a Rebel 15.5 x 17 from an E-TEC I can try, if it fits. The boat is a 23 WALKAROUND and no Whaler Drive.
4050-lbs Boat
630-lbs Engine
860-lbs 150 Gallons fuel
1200-lbs Max gear and people
6740-lbs Heavily loaded
Tom W Clark posted 04-12-2015 08:10 PM ET (US)
Any large (4.75) propeller, from any manufacturer, will fit a V6 Honda.
jimh posted 04-13-2015 01:06 AM ET (US)
Please post articles about propellers to PERFORMANCE. I have moved this thread here.
jimh posted 04-13-2015 12:06 PM ET (US)
From the information you have given in other threads, I believe you are asking about a Honda 250-HP outboard engine on the 23 WALKAROUND.
Plugging in numbers into my CROUCH'S CALCULATOR:
WEIGHT = 6740
POWER = 250
HULL FACTOR = 180
the calculated boat speed is 34.7-MPH
Using my PROPELLER CALCULATOR and with information from Honda's specifications for the BF250:
RPM = 6000
RATIO = 2
PITCH = (to be calculated)
SLIP = 10
SPEED = 34.7
the calculated PITCH is only 13.6. I wonder how the 17-pitch propellers you are going to test will work for this application.
Working the problem the other way, and starting with 17-pitch, the boat speed works out to be 43.5-MPH. Then going to CROUCH's CALCULATOR, you'd need a HULL FACTOR of 226 to be able to reach that speed with the power and weight. I don't think the 23 WALKAROUND hull is that easily driven.
acseatsri posted 04-13-2015 07:04 PM ET (US)
Jim--the reason I think it MIGHT work is my friend's Grady-White 23 Gulfstream (with 9.5-foot beam and engine bracket) with a Yamaha 250-HP Ox66 does almost 40-MPH with a 15.25 x 17 propeller of unknown manufacturer. I believe the gear ratio is 1.86, which would require even more power to spin compared to the 2.0 ratio on the Honda. The propellers I mentioned are available for free to test.
jimh posted 04-15-2015 09:35 AM ET (US)
Boat speed is going to be proportional to weight and power. If you can reduce the 1,200-lbs of crew and gear, you will have more speed potential.
If the boat weight is down to about 6,000-lbs (or 740-lbs less than your "maximum") and we assume a hull constant of 200 (which may be reasonable), then we could expect 250-HP to push the boat to about 40-MPH.
CROUCH'S CALCULATOR
http://continuouswave.com/cgi-bin/crouchcalc.pl
To give 40-MPH from the 6000-RPM engine speed through 2:1 gears, the propeller pitch would be about 15 to 16-pitch
PROPELLER CALCULATOR
http://continuouswave.com/cgi-bin/propcalc.pl
In looking at some prior reports of the 23 WALKAROUND performance, I found a mention of 47-MPH with 300-HP, but that was on a boat with Whaler Drive. The claimed weight was 8,500-lbs. Those numbers result in a hull factor calculation of 250, which is just not even believable. Hull factors of 250 are found on racing hydroplanes, not on deep-V hulls with Whaler Drives.

Cf.: http://continuouswave.com/ubb/Forum4/HTML/005281.html

Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.

Author	Topic: 23 WALKAROUND, Single HONDA 250-HP
acseatsri	posted 04-12-2015 07:44 PM ET (US) What (fixed hub) propellers will fit [a BF250} V6 Honda outboard? I have someone offering me a 15-1/4 x 17 propeller from a Yamaha 300 HPDI. I also have a Rebel 15.5 x 17 from an E-TEC I can try, if it fits. The boat is a 23 WALKAROUND and no Whaler Drive. 4050-lbs Boat 630-lbs Engine 860-lbs 150 Gallons fuel 1200-lbs Max gear and people 6740-lbs Heavily loaded
Tom W Clark	posted 04-12-2015 08:10 PM ET (US) Any large (4.75) propeller, from any manufacturer, will fit a V6 Honda.
jimh	posted 04-13-2015 01:06 AM ET (US) Please post articles about propellers to PERFORMANCE. I have moved this thread here.
jimh	posted 04-13-2015 12:06 PM ET (US) From the information you have given in other threads, I believe you are asking about a Honda 250-HP outboard engine on the 23 WALKAROUND. Plugging in numbers into my CROUCH'S CALCULATOR: WEIGHT = 6740 POWER = 250 HULL FACTOR = 180 the calculated boat speed is 34.7-MPH Using my PROPELLER CALCULATOR and with information from Honda's specifications for the BF250: RPM = 6000 RATIO = 2 PITCH = (to be calculated) SLIP = 10 SPEED = 34.7 the calculated PITCH is only 13.6. I wonder how the 17-pitch propellers you are going to test will work for this application. Working the problem the other way, and starting with 17-pitch, the boat speed works out to be 43.5-MPH. Then going to CROUCH's CALCULATOR, you'd need a HULL FACTOR of 226 to be able to reach that speed with the power and weight. I don't think the 23 WALKAROUND hull is that easily driven.
acseatsri	posted 04-13-2015 07:04 PM ET (US) Jim--the reason I think it MIGHT work is my friend's Grady-White 23 Gulfstream (with 9.5-foot beam and engine bracket) with a Yamaha 250-HP Ox66 does almost 40-MPH with a 15.25 x 17 propeller of unknown manufacturer. I believe the gear ratio is 1.86, which would require even more power to spin compared to the 2.0 ratio on the Honda. The propellers I mentioned are available for free to test.
jimh	posted 04-15-2015 09:35 AM ET (US) Boat speed is going to be proportional to weight and power. If you can reduce the 1,200-lbs of crew and gear, you will have more speed potential. If the boat weight is down to about 6,000-lbs (or 740-lbs less than your "maximum") and we assume a hull constant of 200 (which may be reasonable), then we could expect 250-HP to push the boat to about 40-MPH. CROUCH'S CALCULATOR http://continuouswave.com/cgi-bin/crouchcalc.pl To give 40-MPH from the 6000-RPM engine speed through 2:1 gears, the propeller pitch would be about 15 to 16-pitch PROPELLER CALCULATOR http://continuouswave.com/cgi-bin/propcalc.pl In looking at some prior reports of the 23 WALKAROUND performance, I found a mention of 47-MPH with 300-HP, but that was on a boat with Whaler Drive. The claimed weight was 8,500-lbs. Those numbers result in a hull factor calculation of 250, which is just not even believable. Hull factors of 250 are found on racing hydroplanes, not on deep-V hulls with Whaler Drives. Cf.: http://continuouswave.com/ubb/Forum4/HTML/005281.html