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distance from strut to prop?

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    Posted: May-15-2009 at 6:41pm
Originally posted by SUNAPEE CROW SUNAPEE CROW wrote:

CONNECTICUT...... The place where the DUMBEST MOST AGGRESSIVE DRIVERS live and work. I hate I 84!! Try Hartford at 3:30 on a Friday going either East or West. It is far worse than metro Boston and we have the illegals that can't read!! English that is.


Originally posted by TRBenj TRBenj wrote:

Rick, I do the metro Boston commute every weekday, and I still get to enjoy the Hartford traffic on Friday afternoons. Its the best of both worlds, really.


I don't know about Boston, but when I was interning for Pratt&Whitney I had to commute down I-91 to I-84 East in Hartford to East Hartford...definitely more traffic than I was ever used to growing up in the mid-west. The shear volume is bad yes, but the drivers aren't any dumber than anywhere else in the country.

Stupid = the real pandemic
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: May-15-2009 at 2:09pm
Rick, I do the metro Boston commute every weekday, and I still get to enjoy the Hartford traffic on Friday afternoons. Its the best of both worlds, really.

Brian, the offer still stands to give that Mustang a good shakedown!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hotboat Quote  Post ReplyReply Direct Link To This Post Posted: May-15-2009 at 4:55am
I went to Boston once to meet the hottest chic, I had to fly to 3 dif cities first and met 3 more on the way...so this is sounding like a good idea...I have to leave for a wsop game but will return in a week...sorry bout the vacation?
Brian
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SUNAPEE CROW Quote  Post ReplyReply Direct Link To This Post Posted: May-15-2009 at 1:29am
CONNECTICUT...... The place where the DUMBEST MOST AGGRESSIVE DRIVERS live and work. I hate I 84!! Try Hartford at 3:30 on a Friday going either East or West. It is far worse than metro Boston and we have the illegals that can't read!! English that is.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: May-14-2009 at 11:10pm
Originally posted by hotboat hotboat wrote:

Where is CT?


Brian,
This is a map of the United States of America. If you look in the upper right corner of the country, you'll see Hartford CT. shown. CT. is the abbreviation for Connecticut.



Also, here's a list of the states abbreviations if it will help.

State/Possession          Abbreviation
ALABAMA                         AL
ALASKA                          AK
AMERICAN SAMOA                  AS
ARIZONA                         AZ
ARKANSAS                        AR
CALIFORNIA                      CA
COLORADO                        CO
CONNECTICUT                     CT
DELAWARE                        DE
DISTRICT OF COLUMBIA            DC
FEDERATED STATES OF MICRONESIA FM
FLORIDA                         FL
GEORGIA                         GA
GUAM                            GU
HAWAII                          HI
IDAHO                           ID
ILLINOIS                        IL
INDIANA                         IN
IOWA                            IA
KANSAS                          KS
KENTUCKY                        KY
LOUISIANA                      LA
MAINE                           ME
MARSHALL ISLANDS               MH
MARYLAND                        MD
MASSACHUSETTS                   MA
MICHIGAN                        MI
MINNESOTA                      MN
MISSISSIPPI                     MS
MISSOURI                        MO
MONTANA                         MT
NEBRASKA                        NE
NEVADA                          NV
NEW HAMPSHIRE                   NH
NEW JERSEY                      NJ
NEW MEXICO                      NM
NEW YORK                        NY
NORTH CAROLINA                  NC
NORTH DAKOTA                    ND
NORTHERN MARIANA ISLANDS        MP
OHIO                            OH
OKLAHOMA                        OK
OREGON                          OR
PALAU                           PW
PENNSYLVANIA                    PA
PUERTO RICO                     PR
RHODE ISLAND                    RI
SOUTH CAROLINA                  SC
SOUTH DAKOTA                    SD
TENNESSEE                      TN
TEXAS                           TX
UTAH                            UT
VERMONT                         VT
VIRGIN ISLANDS                  VI
VIRGINIA                        VA
WASHINGTON                      WA
WEST VIRGINIA                   WV
WISCONSIN                      WI
WYOMING                         WY


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Post Options Post Options   Thanks (0) Thanks(0)   Quote C-Bass Quote  Post ReplyReply Direct Link To This Post Posted: May-14-2009 at 7:26pm
Originally posted by TRBenj TRBenj wrote:

Right near Connecticut.


^^^ Haha, yeah very near.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: May-14-2009 at 7:15pm
Right near Connecticut.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hotboat Quote  Post ReplyReply Direct Link To This Post Posted: May-14-2009 at 7:09pm
Where is CT?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: May-14-2009 at 11:31am
Bring it out to CT and Ill wring it out for you!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hotboat Quote  Post ReplyReply Direct Link To This Post Posted: May-14-2009 at 1:18am
wow thats alot of words? the 2 blade was the closest to the the strut and at min it was qrtr in. the acme sits back a little further maybe 3/8 or a lil more. The ideas of the v-drive props was more boat out of the water to start with and from the pics u show me of burn marks, I have none. Maybe you guys could come play with my boat for fun?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 79nautique Quote  Post ReplyReply Direct Link To This Post Posted: May-13-2009 at 6:11pm
when you look at it that is what you are trying to control, the center of this is the center of that, and it was pretty common practice, but as more and more learn the proper applications of GD&T the standards committy started backing off endorsing it's use and several company's do not allow for it to be use and state so in their own standards manuals.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: May-13-2009 at 5:59pm
Chris,
Thanks for bringing up the concentricity. I did use it as sort of a "catch all" term. "Run out" would have been better.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote 79nautique Quote  Post ReplyReply Direct Link To This Post Posted: May-13-2009 at 5:31pm
your a little close with the .25 gap it should be around 1/2 provided you have tip clearence as Pete stated, it does help it moving it closer to the strut, less flexx, changes the bow rise and does help the hole shot having it closer to the strut. It's not a huge difference but it is noticible.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 79nautique Quote  Post ReplyReply Direct Link To This Post Posted: May-13-2009 at 5:27pm
concentricity is not a very good means to control postion or orinentation and is not recommend to use it in todays world.

it's all most impossible to measure correctly since you have to find the actual centerline of the feature which will never be straight in the real world so it ends up being a derived best fit. Much cheaper and easier to control by using runout or true position with a cylindricity refinement if it needs tight control, but hey GD&T's not everyones bag and over 50% of the people that use it regularly are appling it incorrectly and measuring it incorrectly as well.

yes it's in the ASME standards and Yes they used to make a gauge to check it but it's poor practice by todays design standards and it never is measured correctly.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: May-13-2009 at 9:55am
"Prop burn" or "hull rash" isn't a mark but rather areas of errosion caused by water/air cavitation. So, how close is the new prop?





With your vibration problem, did you:
Originally posted by 8122pbrainard 8122pbrainard wrote:

before you cut the shaft off, did you check the shaft for straightness using a dial indicator, installed a new cutlass bearing and then lapped the prop onto the shaft.


Your being a tool maker, you can certainly appreciate the importance of tight tolerances and concentricity's.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote hotboat Quote  Post ReplyReply Direct Link To This Post Posted: May-13-2009 at 12:28am
I was going on a recommendation from the prop manufacturer and it was only an 11 or 12 inch diameter so that prop wasn't as close to the hull but my acme is pretty close. Havent had any marks show on the hull yet and I can still fit the puller on. Maybe I will push he back out some though if I have enough spare still in there. My 90 Nautique was just as close to the strut but I dont recall how close to the hull the prop was? Thanks for the input!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2009 at 11:43pm
Brian,
Hopefully before you cut the shaft off, you had the prop balanced/tuned, the shaft checked for straightness using a dial indicator, installed a new cutlass bearing and then lapped the prop onto the shaft. With a prop that close to the strut I'd be a little concerned about proper water flow through the cutlass. Can you still get a prop puller on it or do you need to separate the coupling halves?

The prop should clear the hull by 10% of the prop diameter. I don't know the performance difference with running less than the 10% but I do know it hurts it. The turbulence created as the prop swings up towards the hull really creates a imbalance. With less than the proper clearance, you are also risking damage to the hull with prop burn. I've seen the gel gone and the glass hull eroded.

BTW, the normal rule of thumb distance for the prop hub from the strut is 1 to 1&1/2 time the shaft diameter.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote hotboat Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2009 at 8:13pm
Unfortunately I made a bunch of other changes at the same time,it did smooth it out some tho
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Post Options Post Options   Thanks (0) Thanks(0)   Quote eric lavine Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2009 at 7:51pm
i would think you would since you moved it, thats not saying it sarcastically
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hotboat Quote  Post ReplyReply Direct Link To This Post Posted: May-12-2009 at 7:18pm
2 yrs ago I shortened my shaft by 2 inches to get the prop within 1/4 inch of the strut, I was trying to get the 2 blade prop to run a little smoother. Just wondered if anyone knows the performance difference by moving the prop that much closer to the hull?
Brian
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