JH
John Hinshaw
Sat, Jun 30, 2012 11:03 PM
Fellow Trawlerers: Had lunch today with the regular old farts and a question come up
that I knew would be great for this list. Seems one of them dinged his 4 blade prop. The
folks at the prop shop asked why he was running a 4 blade - and proceeded to explain how
much more efficient a 3 blade would be. And, that with the same power setting in his boat
he'd gain a knot in cruise speed with a 3 blade prop and they were cheaper to repair and
much more efficient.
Any responses from the experts? Or advice?
John Hinshaw
Seahawk III
Cathlamet, WA
Fellow Trawlerers: Had lunch today with the regular old farts and a question come up
that I knew would be great for this list. Seems one of them dinged his 4 blade prop. The
folks at the prop shop asked why he was running a 4 blade - and proceeded to explain how
much more efficient a 3 blade would be. And, that with the same power setting in his boat
he'd gain a knot in cruise speed with a 3 blade prop and they were cheaper to repair and
much more efficient.
Any responses from the experts? Or advice?
John Hinshaw
Seahawk III
Cathlamet, WA
CM
Craig Mudge
Sat, Jun 30, 2012 11:28 PM
John.
We ran the original 3 blade on our Krogen from 1999 until 2006. We were then talked into trying a 4 blade and appreciated the extra smoothness it produced. We estimate we lost @ .2 knots at 1850 RPM. (from 7.6 to 7.4).
If you don't ding it they cost the same to repair.
Craig Mudge
Moon Star
KK42 #94
Portland, Maine
On Jun 30, 2012, at 7:03 PM, John Hinshaw wrote:
Fellow Trawlerers: Had lunch today with the regular old farts and a question come up
that I knew would be great for this list. Seems one of them dinged his 4 blade prop. The
folks at the prop shop asked why he was running a 4 blade - and proceeded to explain how
much more efficient a 3 blade would be. And, that with the same power setting in his boat
he'd gain a knot in cruise speed with a 3 blade prop and they were cheaper to repair and
much more efficient.
Any responses from the experts? Or advice?
John Hinshaw
Seahawk III
Cathlamet, WA
http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
To unsubscribe or modify your subscription options (get password, change email address, etc) go to: http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
Trawlers & Trawlering and T&T are trademarks of Water World
Productions. Unauthorized use is prohibited.
John.
We ran the original 3 blade on our Krogen from 1999 until 2006. We were then talked into trying a 4 blade and appreciated the extra smoothness it produced. We estimate we lost @ .2 knots at 1850 RPM. (from 7.6 to 7.4).
If you don't ding it they cost the same to repair.
Craig Mudge
Moon Star
KK42 #94
Portland, Maine
On Jun 30, 2012, at 7:03 PM, John Hinshaw wrote:
> Fellow Trawlerers: Had lunch today with the regular old farts and a question come up
> that I knew would be great for this list. Seems one of them dinged his 4 blade prop. The
> folks at the prop shop asked why he was running a 4 blade - and proceeded to explain how
> much more efficient a 3 blade would be. And, that with the same power setting in his boat
> he'd gain a knot in cruise speed with a 3 blade prop and they were cheaper to repair and
> much more efficient.
>
> Any responses from the experts? Or advice?
>
> John Hinshaw
> Seahawk III
> Cathlamet, WA
> _______________________________________________
> http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
>
> To unsubscribe or modify your subscription options (get password, change email address, etc) go to: http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
> Trawlers & Trawlering and T&T are trademarks of Water World
> Productions. Unauthorized use is prohibited.
RR
Ron Rogers
Sat, Jun 30, 2012 11:49 PM
It was my understanding that 3 blades are more efficient than 4 or more
blade propellers. However, if vibration is an issue, 4 blades can help.
Also, if clearance is an issue, a 4 blade can supply the desired blade area
in a smaller diameter. However, I had my 3 blade computer pitched and
balanced and that made it incredibly smoother. I had not realized that my
prop wasn't smooth and just desired the pitch changed.
Ron Rogers
Willard 40 full-displacement
On Sat, Jun 30, 2012 at 7:28 PM, Craig Mudge cwmudge@me.com wrote:
John.
We ran the original 3 blade on our Krogen from 1999 until 2006. We were
then talked into trying a 4 blade and appreciated the extra smoothness it
produced. We estimate we lost @ .2 knots at 1850 RPM. (from 7.6 to 7.4).
If you don't ding it they cost the same to repair.
Craig Mudge
Moon Star
KK42 #94
Portland, Maine
It was my understanding that 3 blades are more efficient than 4 or more
blade propellers. However, if vibration is an issue, 4 blades can help.
Also, if clearance is an issue, a 4 blade can supply the desired blade area
in a smaller diameter. However, I had my 3 blade computer pitched and
balanced and that made it incredibly smoother. I had not realized that my
prop wasn't smooth and just desired the pitch changed.
Ron Rogers
Willard 40 full-displacement
On Sat, Jun 30, 2012 at 7:28 PM, Craig Mudge <cwmudge@me.com> wrote:
> John.
>
> We ran the original 3 blade on our Krogen from 1999 until 2006. We were
> then talked into trying a 4 blade and appreciated the extra smoothness it
> produced. We estimate we lost @ .2 knots at 1850 RPM. (from 7.6 to 7.4).
> If you don't ding it they cost the same to repair.
>
> Craig Mudge
> Moon Star
> KK42 #94
> Portland, Maine
>
RG
Rich Gano
Sun, Jul 1, 2012 12:13 AM
And two blades are supposedly more efficient that three, and one blade, if
you could handle the vibration, is theoretically more efficient still.
Anyone for no blades?
Rich Gano
Calypso (GB42 Hull # 295)
Panama City area, FL
-----Original Message-----
It was my understanding that 3 blades are more efficient than 4 or more
blade propellers. However, if vibration is an issue, 4 blades can help.
Also, if clearance is an issue, a 4 blade can supply the desired blade area
in a smaller diameter.
And two blades are supposedly more efficient that three, and one blade, if
you could handle the vibration, is theoretically more efficient still.
Anyone for no blades?
Rich Gano
Calypso (GB42 Hull # 295)
Panama City area, FL
-----Original Message-----
It was my understanding that 3 blades are more efficient than 4 or more
blade propellers. However, if vibration is an issue, 4 blades can help.
Also, if clearance is an issue, a 4 blade can supply the desired blade area
in a smaller diameter.
SS
Steve Sipe
Sun, Jul 1, 2012 12:32 AM
On 6/30/2012 8:13 PM, Rich Gano wrote:
And two blades are supposedly more efficient that three, and one blade, if
you could handle the vibration, is theoretically more efficient still.
Anyone for no blades?
Your logic has flaws.
Reminds me of the gallagherism- if pro-gress is moving forward, then
what is con-gress?
Steve Sipe
Solo 4303 "Maerin"
Brunswick, GA
On 6/30/2012 8:13 PM, Rich Gano wrote:
> And two blades are supposedly more efficient that three, and one blade, if
> you could handle the vibration, is theoretically more efficient still.
> Anyone for no blades?
>
Your logic has flaws.
Reminds me of the gallagherism- if pro-gress is moving forward, then
what is con-gress?
--
Steve Sipe
Solo 4303 "Maerin"
Brunswick, GA
KT
Ken Tischler
Sun, Jul 1, 2012 1:02 AM
I tried the no blade version. It was incredibly smooth, but I was not happy
with the speed it gave me.
Ken Tischler
Microship
DeFever 49 RPH
On Saturday, June 30, 2012, Rich Gano wrote:
And two blades are supposedly more efficient that three, and one blade, if
you could handle the vibration, is theoretically more efficient still.
Anyone for no blades?
Rich Gano
Calypso (GB42 Hull # 295)
Panama City area, FL
--
Ken Tischler
Microship
DeFever 49RPH
Bay St Louis, MS
I tried the no blade version. It was incredibly smooth, but I was not happy
with the speed it gave me.
Ken Tischler
Microship
DeFever 49 RPH
On Saturday, June 30, 2012, Rich Gano wrote:
> And two blades are supposedly more efficient that three, and one blade, if
> you could handle the vibration, is theoretically more efficient still.
> Anyone for no blades?
>
> Rich Gano
> Calypso (GB42 Hull # 295)
> Panama City area, FL
>
>
--
--
Ken Tischler
Microship
DeFever 49RPH
Bay St Louis, MS
SE
Steve's Email
Sun, Jul 1, 2012 3:33 AM
John,
My Willard 40 came with a 4 bladed prop mounted on the boat and the original 3 bladed prop as a spare. There is documentation that came with the boat that the second owner and the original owner were into a disagreement over the prop. The second owner stated t that 4 must be better than 3 and it "has to go faster." They went back and forth at the sale. I am the fourth owner and the original 3 bladed prop actually has less hours on it then the replacement 4 blade. I had the 3 blade computer serviced and reconditioned. I was told by a very reputable boat yard in Deltaville, VA that I should expect .5-1.0 knot increase using the 3 blade. They said because I will always have 66% of the blades exposed to create thrust/power where as the 4 blade has the potential for 80% but 50% on each quarter revolution. I made the switch and I indeed have almost 1.0 knot increase on WOT but indeed there is more vibration than with the 4 blade. For now I will keep the 1 knot increase and deal with the increased vibration (not so bad unless approaching WOT).
Steve
Steve Bedford
No Regrets
W40 FBS
Burgess, VA
Sent from my iPhone. Please excuse misused words due to "auto correct" function.
On Jun 30, 2012, at 7:03 PM, John Hinshaw hinshawfamily@yahoo.com wrote:
Fellow Trawlerers: Had lunch today with the regular old farts and a question come up
that I knew would be great for this list. Seems one of them dinged his 4 blade prop. The
folks at the prop shop asked why he was running a 4 blade - and proceeded to explain how
much more efficient a 3 blade would be. And, that with the same power setting in his boat
he'd gain a knot in cruise speed with a 3 blade prop and they were cheaper to repair and
much more efficient.
Any responses from the experts? Or advice?
John Hinshaw
Seahawk III
Cathlamet, WA
http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
To unsubscribe or modify your subscription options (get password, change email address, etc) go to: http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
Trawlers & Trawlering and T&T are trademarks of Water World
Productions. Unauthorized use is prohibited.
John,
My Willard 40 came with a 4 bladed prop mounted on the boat and the original 3 bladed prop as a spare. There is documentation that came with the boat that the second owner and the original owner were into a disagreement over the prop. The second owner stated t that 4 must be better than 3 and it "has to go faster." They went back and forth at the sale. I am the fourth owner and the original 3 bladed prop actually has less hours on it then the replacement 4 blade. I had the 3 blade computer serviced and reconditioned. I was told by a very reputable boat yard in Deltaville, VA that I should expect .5-1.0 knot increase using the 3 blade. They said because I will always have 66% of the blades exposed to create thrust/power where as the 4 blade has the potential for 80% but 50% on each quarter revolution. I made the switch and I indeed have almost 1.0 knot increase on WOT but indeed there is more vibration than with the 4 blade. For now I will keep the 1 knot increase and deal with the increased vibration (not so bad unless approaching WOT).
Steve
-------------
Steve Bedford
No Regrets
W40 FBS
Burgess, VA
Sent from my iPhone. Please excuse misused words due to "auto correct" function.
On Jun 30, 2012, at 7:03 PM, John Hinshaw <hinshawfamily@yahoo.com> wrote:
> Fellow Trawlerers: Had lunch today with the regular old farts and a question come up
> that I knew would be great for this list. Seems one of them dinged his 4 blade prop. The
> folks at the prop shop asked why he was running a 4 blade - and proceeded to explain how
> much more efficient a 3 blade would be. And, that with the same power setting in his boat
> he'd gain a knot in cruise speed with a 3 blade prop and they were cheaper to repair and
> much more efficient.
>
> Any responses from the experts? Or advice?
>
> John Hinshaw
> Seahawk III
> Cathlamet, WA
> _______________________________________________
> http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
>
> To unsubscribe or modify your subscription options (get password, change email address, etc) go to: http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
> Trawlers & Trawlering and T&T are trademarks of Water World
> Productions. Unauthorized use is prohibited.
K
Keith
Sun, Jul 1, 2012 7:34 PM
I think a one bladed prop is also known as a paddle.
Keith
-----Original Message-----
From: trawlers-bounces@lists.trawlering.com
[mailto:trawlers-bounces@lists.trawlering.com] On Behalf Of Rich Gano
Sent: Saturday, June 30, 2012 7:13 PM
To: Ron Rogers
Cc: trawlers@lists.trawlering.com
Subject: Re: T&T: Prop question
And two blades are supposedly more efficient that three, and one blade, if
you could handle the vibration, is theoretically more efficient still.
Anyone for no blades?
Rich Gano
Calypso (GB42 Hull # 295)
Panama City area, FL
-----Original Message-----
It was my understanding that 3 blades are more efficient than 4 or more
blade propellers. However, if vibration is an issue, 4 blades can help.
Also, if clearance is an issue, a 4 blade can supply the desired blade area
in a smaller diameter.
http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
To unsubscribe or modify your subscription options (get password, change
email address, etc) go to:
http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
Trawlers & Trawlering and T&T are trademarks of Water World Productions.
Unauthorized use is prohibited.
I think a one bladed prop is also known as a paddle.
Keith
___________________
-----Original Message-----
From: trawlers-bounces@lists.trawlering.com
[mailto:trawlers-bounces@lists.trawlering.com] On Behalf Of Rich Gano
Sent: Saturday, June 30, 2012 7:13 PM
To: Ron Rogers
Cc: trawlers@lists.trawlering.com
Subject: Re: T&T: Prop question
And two blades are supposedly more efficient that three, and one blade, if
you could handle the vibration, is theoretically more efficient still.
Anyone for no blades?
Rich Gano
Calypso (GB42 Hull # 295)
Panama City area, FL
-----Original Message-----
It was my understanding that 3 blades are more efficient than 4 or more
blade propellers. However, if vibration is an issue, 4 blades can help.
Also, if clearance is an issue, a 4 blade can supply the desired blade area
in a smaller diameter.
_______________________________________________
http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
To unsubscribe or modify your subscription options (get password, change
email address, etc) go to:
http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
Trawlers & Trawlering and T&T are trademarks of Water World Productions.
Unauthorized use is prohibited.
HG
Harry Graham
Sun, Jul 1, 2012 9:11 PM
Single bladed props are sometimes used on high performance model planes. They have weight opposite the blade to balance the prop. Usually rubber band powered planes, also the blade usually folds back when the rubber band runs out.
Harry
Sent from my iPad, expect typos.
On Jul 1, 2012, at 12:34, "Keith" keith@anastasia3.com wrote:
I think a one bladed prop is also known as a paddle.
Keith
-----Original Message-----
From: trawlers-bounces@lists.trawlering.com
[mailto:trawlers-bounces@lists.trawlering.com] On Behalf Of Rich Gano
Sent: Saturday, June 30, 2012 7:13 PM
To: Ron Rogers
Cc: trawlers@lists.trawlering.com
Subject: Re: T&T: Prop question
And two blades are supposedly more efficient that three, and one blade, if
you could handle the vibration, is theoretically more efficient still.
Anyone for no blades?
Rich Gano
Calypso (GB42 Hull # 295)
Panama City area, FL
-----Original Message-----
It was my understanding that 3 blades are more efficient than 4 or more
blade propellers. However, if vibration is an issue, 4 blades can help.
Also, if clearance is an issue, a 4 blade can supply the desired blade area
in a smaller diameter.
http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
To unsubscribe or modify your subscription options (get password, change
email address, etc) go to:
http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
Trawlers & Trawlering and T&T are trademarks of Water World Productions.
Unauthorized use is prohibited.
http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
To unsubscribe or modify your subscription options (get password, change email address, etc) go to: http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
Trawlers & Trawlering and T&T are trademarks of Water World
Productions. Unauthorized use is prohibited.
Single bladed props are sometimes used on high performance model planes. They have weight opposite the blade to balance the prop. Usually rubber band powered planes, also the blade usually folds back when the rubber band runs out.
Harry
Sent from my iPad, expect typos.
On Jul 1, 2012, at 12:34, "Keith" <keith@anastasia3.com> wrote:
> I think a one bladed prop is also known as a paddle.
>
> Keith
> ___________________
>
> -----Original Message-----
> From: trawlers-bounces@lists.trawlering.com
> [mailto:trawlers-bounces@lists.trawlering.com] On Behalf Of Rich Gano
> Sent: Saturday, June 30, 2012 7:13 PM
> To: Ron Rogers
> Cc: trawlers@lists.trawlering.com
> Subject: Re: T&T: Prop question
>
> And two blades are supposedly more efficient that three, and one blade, if
> you could handle the vibration, is theoretically more efficient still.
> Anyone for no blades?
>
> Rich Gano
> Calypso (GB42 Hull # 295)
> Panama City area, FL
>
> -----Original Message-----
>
>
> It was my understanding that 3 blades are more efficient than 4 or more
> blade propellers. However, if vibration is an issue, 4 blades can help.
> Also, if clearance is an issue, a 4 blade can supply the desired blade area
> in a smaller diameter.
>
>
> _______________________________________________
> http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
>
> To unsubscribe or modify your subscription options (get password, change
> email address, etc) go to:
> http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
> Trawlers & Trawlering and T&T are trademarks of Water World Productions.
> Unauthorized use is prohibited.
>
>
> _______________________________________________
> http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
>
> To unsubscribe or modify your subscription options (get password, change email address, etc) go to: http://lists.trawlering.com/mailman/listinfo/trawlers_lists.trawlering.com
> Trawlers & Trawlering and T&T are trademarks of Water World
> Productions. Unauthorized use is prohibited.
>
LA
Lee A Licata
Thu, Jul 5, 2012 10:08 PM
When commissioning a 44 ton 50' trawler, tried a 4 bladed and a 3 bladed prop.
Went with the three bladed.
RPM at the "sweet spot was right on (just luck, trust me) and the vibration was "acceptable."
Did have it balanced (two blades needed a 9 and 11 gram "adjustment").
Vibration? next to none.
am happy so far but still have my eye on the 4 bladed prop sitting at the "prop guy."
Lee
Gocek Turkey
On Jul 1, 2012, at 02:03 , John Hinshaw wrote:
Fellow Trawlerers: Had lunch today with the regular old farts and a question come up
that I knew would be great for this list....
When commissioning a 44 ton 50' trawler, tried a 4 bladed and a 3 bladed prop.
Went with the three bladed.
RPM at the "sweet spot was right on (just luck, trust me) and the vibration was "acceptable."
Did have it balanced (two blades needed a 9 and 11 gram "adjustment").
Vibration? next to none.
am happy so far but still have my eye on the 4 bladed prop sitting at the "prop guy."
Lee
Gocek Turkey
On Jul 1, 2012, at 02:03 , John Hinshaw wrote:
Fellow Trawlerers: Had lunch today with the regular old farts and a question come up
that I knew would be great for this list....
