Electrical actually, but with my fair share of mechanical stuff throughout my career... *Keith R. Martin, P.Eng.* *Burnaby, B.C. CanadaSerenity,** M17 Hull #353* On 8 February 2016 at 19:05, John Tyner <tynerjr@md.metrocast.net> wrote:
3x? Must be a civil, and not an aerospace, engineer! :-) ----- John Tyner M-15 # 412 "Chimpanzee"
On 2/8/2016 9:53 PM, Keith R. Martin wrote:
Hi John,
I chose stainless to get the desired strength in a given std dimension and wall thickness from metal supermarkets. This helped with one of the key "features" I wanted which was the ability a 5 inch "floating span" to move my spinnaker sheave forward by 4-5 inches to provide clearance for my top down furler.
To be fair I found a thicker aluminium stock that probably would have done the trick except for the fact that I couldn't get it to pass the std 3x design hurdle all us engineers are so fond of :)
In the end the the final unit is not very heavy ..
Keith
*Keith R. Martin, P.Eng.*
*Burnaby, B.C. CanadaSerenity,** M17 Hull #353*
On 8 February 2016 at 14:38, John Schinnerer <john@eco-living.net> wrote:
Keith,
Is there a reason you used stainless instead of aluminum? Any reason to not consider aluminum stock for something like this as well?
thanks, John S.
On 02/08/2016 08:20 AM, Keith R. Martin wrote:
Thanks Connie, I am quite happy with how it turned out..
Keith
Keith R. Martin, P.Eng. Burnaby, BC, Canada Serenity M17, Hull #353 On Feb 7, 2016 5:56 AM, "Conbert Benneck" <chbenneck@gmail.com> wrote:
On 2/6/2016 4:50 PM, Keith R. Martin wrote:
Keith,
Congratulations. That's an elegant solution to the problem. You have all the benefits of nav lights, VHF antenna, and your sheave in one neat, easily removable package.
Connie
John brings up a good point about having "stuff" on the top of a trailer
sailor mast...
I too was worried about that when trailering the boat but I was reluctant to trade off the visibility provided by mast mounted lighting ...
However when combined with my other "wants", including a mast mounted VHF antenna in support of my penchant for sailing "off the beaten track", and 4-5 inches of forward separation between my furling jib & spinnaker sheave used by my top down asym furler, my solution was to fab up a removable mast head assembly that could be easily removed when trailering.
Attached is a picture of my mast head cap.
Constructed out of standard square stainless tubing and a small peace of teak, it provides a mounting arrangement for the tri-colour, all round white, VHF antenna , windex, and extended spinnaker sheave... It slides firmly over top of the existing bare masthead, has a flat 4 power connector for the lights and the standard stainless RF connector of the antenna, it is secured with two 1/4" stainless rigging pins...
It takes just a couple of minutes to install or remove...
Keith
*Keith R. Martin, P.Eng.*
*Burnaby, B.C. CanadaSerenity,** M17 Hull #353*
On 6 February 2016 at 13:44, John Schinnerer <john@eco-living.net> wrote:
Yeah, I have the normal deck nav lights - split green/red bow, white
stern. So I am covered when under sail at night. > > But if I want to motor at night I also need either a forward facing > 225 > deg. white light ("steaming" light) plus stern light, or, an > all-around > white light. > For anchoring, also an all-around white light. > > So I'm thinking the all-around white covers both anchor and steaming. > But > yeah, I'd rather not add fragile stuff to the top of the mast on a > trailer > sailor. And wiring in the mast. > > But neither anchor nor steaming light needs to be on top of mast. > Just > needs to be visible 360 degrees, and there's something about the > steaming > light is supposed to be a meter or more above the green/red lights. > So > a > clamp-on LED 360 deg. light would probably cover it. > > Agree about the night sailing...it is an awesome experience. Most > I've > done of it was in Hilo bay on a Corsair 31 tri. Nothing like > whooshing > along at low-heel multihull speeds in the tropical moonlight! > Many many years ago, got to do a night passage in the archipelago > around > Stockholm, Sweden. In a pre-WWII classic wooden "archipelago cruiser" > sailboat, no less. It's quite the navigation experience, sailing > those > channels in the dark, setting course via multiple lights' visible > angles, > colors, and frequencies. > > cheers, > John S. > > On 02/05/2016 07:40 PM, Thomas Buzzi wrote: > > John, > > I had considered the all around white light combined with the 135 >> stern >> light plus the red and green but it added almost a foot to the top >> of >> the >> mast plus I already had the wiring roughed in for the deck nav. >> lights >> from >> the factory so I went that way. You are correct and I am glad the >> stern >> light is only 135degrees. Less chance of light bleed into the >> cockpit >> at >> night.I plan to do night sailing as I have done with all my boats. >> Nothing >> like being out there for a full moon and watch it rise above the >> waves. >> Not >> to mention the phosphorescence you can stir up with your wake. >> Really >> beautiful time to go out. No hot sun either. >> fair winds, >> Tom B >> <https://www.avast.com/sig-email> This email has been sent from a >> virus-free computer protected by Avast. >> www.avast.com <https://www.avast.com/sig-email> >> <#DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >> >> On Fri, Feb 5, 2016 at 7:12 PM, John Schinnerer < >> john@eco-living.net> >> wrote: >> >> The dome-top perko stern lights look at a glance like they are 180 >> >> degrees, but I'm pretty sure they are 135, the specified visible >> angle >> >>> for >>> a stern light per USCG rules. Mine is something less than 180 >>> anyhow. I >>> can >>> tell just by looking at the arc vs. the whole circle, plus if I >>> sight >>> across the edges of the vertical opening, the bulb is nearly or >>> completely >>> hidden. If it were 180 I would see half the bulb. >>> >>> Given the mounting location (on slope of coaming at rear of >>> cockpit) >>> and >>> 135 degree visible angle, the cockpit (certainly the forward 3/4 of >>> it) >>> would be shielded from the bulb due to location and angle, I >>> think...I'll >>> check when I get a battery in her. >>> >>> Kevin's configuration is nifty and legal...but more wiring in the >>> mast. >>> I'm wanting to avoid having to bother wiring inside the mast and >>> through >>> the deck. But if I'm ever going to motor at night "legally," I will >>> need >>> to >>> - for all-around white, or, 225 degree "steaming" light. Or, have >>> an >>> all-around white light mounted down low where it will mess with >>> night >>> vision. >>> >>> The all-around white would do for both under power and anchor >>> light, >>> so >>> I'm leaning towards that.. >>> >>> cheers, >>> John S. >>> >>> On 02/05/2016 01:51 PM, Thomas Buzzi wrote: >>> >>> Good idea. I am concerned about using that 180 point stern light >>> and >>> >>> preserving night vision. The newer montys have the stern light >>> flush >>> >>>> mounted on the transom so no light finds its way across the >>>> cockpit. >>>> <https://www.avast.com/sig-email> This email has been sent from a >>>> virus-free computer protected by Avast. >>>> www.avast.com <https://www.avast.com/sig-email> >>>> <#DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>>> >>>> On Fri, Feb 5, 2016 at 2:45 PM, Keith R. Martin < >>>> keith.richard.martin@gmail.com> wrote: >>>> >>>> Interesting discussion on stern lights..... >>>> >>>> In my case I chose to have a mast mounted tri-colour and an all >>>> round >>>> >>>> white, as well as side mounted nav lights on each side of the Bow. >>>>> >>>>> So when sailing just the typical tri-colour up top, but when >>>>> under >>>>> power >>>>> my >>>>> lights are configured with the all white up top and the side >>>>> mounted >>>>> nav >>>>> lights lit up, allowing me to avoid placement of an actual stern >>>>> light >>>>> at >>>>> cockpit level. >>>>> >>>>> Is anyone else using this configuration?? >>>>> >>>>> >>>>> >>>>> *Keith R. Martin, P.Eng.* >>>>> >>>>> *Burnaby, B.C. CanadaSerenity,** M17 Hull #353* >>>>> >>>>> >>>>> >>>>> On 4 February 2016 at 19:41, John Schinnerer < >>>>> john@eco-living.net> >>>>> wrote: >>>>> >>>>> On 02/04/2016 09:09 AM, Thomas Buzzi wrote: >>>>> >>>>> ... Also very handy for dealing with the aft running lite or when >>>>> >>>>> adding wiring for an auto helm. >>>>>> >>>>>> >>>>>>> Speaking of stern light - my M17 has the standard Perko dome >>>>>>> style >>>>>>> >>>>>>> light >>>>>>> >>>>>> installed on the downward slope of the port side coaming where >>>>>> it >>>>>> drops >>>>>> down to the transom. >>>>>> But it was just mounted flat on the slope, meaning it's tilted >>>>>> quite >>>>>> steeply. The solid part of the dome blocks a lot of the light >>>>>> astern >>>>>> (problematic, for a stern light!). >>>>>> >>>>>> Some of the pictures shared recently about other things (like >>>>>> rudders) >>>>>> included a view of same light in same place, but with a nice >>>>>> wood >>>>>> wedge >>>>>> under the light so it sits level with respect to the horizon. >>>>>> >>>>>> For those who have something like that for their stern light - >>>>>> was >>>>>> it >>>>>> something you bought, or did you make it or have it made, >>>>>> one-off? >>>>>> >>>>>> I want to level my light in same way so wondering if there's >>>>>> something >>>>>> ready-made or I'll need to make it. >>>>>> >>>>>> thanks, >>>>>> John S. >>>>>> >>>>>> >>>>>> -- >>>>>> John Schinnerer - M.A., Whole Systems Design >>>>>> -------------------------------------------- >>>>>> - Eco-Living - >>>>>> Whole Systems Design Services >>>>>> People - Place - Learning - Integration >>>>>> john@eco-living.net - 510.982.1334 >>>>>> http://eco-living.net >>>>>> http://sociocracyconsulting.com >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> >>>>>> John Schinnerer - M.A., Whole Systems Design >>>>> >>>> -------------------------------------------- >>> - Eco-Living - >>> Whole Systems Design Services >>> People - Place - Learning - Integration >>> john@eco-living.net - 510.982.1334 >>> http://eco-living.net >>> http://sociocracyconsulting.com >>> >>> >>> >>> -- >>> >>> John Schinnerer - M.A., Whole Systems Design >> > -------------------------------------------- > - Eco-Living - > Whole Systems Design Services > People - Place - Learning - Integration > john@eco-living.net - 510.982.1334 > http://eco-living.net > http://sociocracyconsulting.com > > > > > --
John Schinnerer - M.A., Whole Systems Design -------------------------------------------- - Eco-Living - Whole Systems Design Services People - Place - Learning - Integration john@eco-living.net - 510.982.1334 http://eco-living.net http://sociocracyconsulting.com