the evinrude e-tec 115 (no longer make a 90) weighs 370+ pounds.
you OK with that?
your current nissan weighs less than 200 right?
it's like having twins on the transom.
plus, as you've heard time and time again...
"you'll void your warranty".
engine size , 50, 60, 70 ?
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Bobby T.-26X #4767
- Captain
- Posts: 906
- Joined: Mon Jan 05, 2004 10:48 am
- Sailboat: MacGregor 26X
- Location: Oceanside Harbor, CA
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waternwaves
- Admiral
- Posts: 1499
- Joined: Wed Oct 13, 2004 8:18 pm
- Location: X less in North Puget Sound -have to sail other boats for a while
Bobby,
The Etec is very much in production, here is the link to the evinrude webpage Evinrude Etec, Evinrude has not updated their main page, and rather constructed a new entry portal for the E-tec engine series.
btw, as a buyer of a used 96 mac, taint got no warranty........according to mac and consumer law in washinton...
and since I am integrating the engine upgrade as a package..... (internal tri-axial glass, molded beams etc) transom, hull, engine, steering , rudder modifications together, (believe it or not, this started as a project to reclaim the aft berth from the previous owners lectrasan head, shower, and holding tank installation) which is the only way to do this right , I think. my goal is to have the mods done internally and result in a stronger boat, not just stronger parts on the boat.
For those who are contemplating this, I will take the time and advise you now, powering through 6 ft breakers pust extreme stress on more thna just the transom and engine. the mast step is also a location that could use considerable reinforcement, That is a small mast, and that location on the hull receives considerable stress. there is considerable whip the faster the boat goes...... This is the limiting factor for me...right now, and much harder to design an elegant solution to. I have purchased strain gauges to measure the amount of deck flex, but if my old Mech eng training suffices here. having the flex of the mast with 1/2 its period results in about 4 times the stress in the beam of the mast, the faster you pound it...the shorter the flex period..... strain gauges show a period of about 7/10 ths of a secon at 18 mph , I'll do some analysis of this.... but it causes me some concern at higher speeds, the chainplates seem to have the capacity, since there is also flex in the deck to take that load, but the fore and aft stays connections may need a little beefing also..... ( which I wanted anyway for stormjib, staysail, trysail running and I have not figured out a way to measure strain in the hull at the bow... only in the forestay).
The mac really is an integrated boat, So like many other engineering types that are working on this forum.... it is a platform for me....
now for the preferred failure modes..... I would prefer the mast to snap before the rigging, or the hull conections, I would prefer the steering to break inside the boat (so I dont have to hold onto the rudders again to steer), I will design an emergency tiller bar which connects to the steering bend bracket to give me a backup tiller.. ( looks like the Edson tilting radar mast bracket 2 3/8" is perfect for this application) and a 3ft long vertical handle seems to provide plenty of torque, and does not hit the engine.
So .. I understand your intent..and concern about repowering, But it can be done safely.. Would be really nice if Roger shared some of his hull structural design analysis for those of us who want to re-engineer some items. seems he could get come free engineering out of the deal... oh thats right.......HE DOESNT MAKE a 26X anymore..
so, I will gladly change structural design info of transom mods for someone who comes up with a way to reinforce the mast connection.. cuz I will have to wait a year before I'll have time...
enjoy all, for me its back to measuring
The Etec is very much in production, here is the link to the evinrude webpage Evinrude Etec, Evinrude has not updated their main page, and rather constructed a new entry portal for the E-tec engine series.
btw, as a buyer of a used 96 mac, taint got no warranty........according to mac and consumer law in washinton...
and since I am integrating the engine upgrade as a package..... (internal tri-axial glass, molded beams etc) transom, hull, engine, steering , rudder modifications together, (believe it or not, this started as a project to reclaim the aft berth from the previous owners lectrasan head, shower, and holding tank installation) which is the only way to do this right , I think. my goal is to have the mods done internally and result in a stronger boat, not just stronger parts on the boat.
For those who are contemplating this, I will take the time and advise you now, powering through 6 ft breakers pust extreme stress on more thna just the transom and engine. the mast step is also a location that could use considerable reinforcement, That is a small mast, and that location on the hull receives considerable stress. there is considerable whip the faster the boat goes...... This is the limiting factor for me...right now, and much harder to design an elegant solution to. I have purchased strain gauges to measure the amount of deck flex, but if my old Mech eng training suffices here. having the flex of the mast with 1/2 its period results in about 4 times the stress in the beam of the mast, the faster you pound it...the shorter the flex period..... strain gauges show a period of about 7/10 ths of a secon at 18 mph , I'll do some analysis of this.... but it causes me some concern at higher speeds, the chainplates seem to have the capacity, since there is also flex in the deck to take that load, but the fore and aft stays connections may need a little beefing also..... ( which I wanted anyway for stormjib, staysail, trysail running and I have not figured out a way to measure strain in the hull at the bow... only in the forestay).
The mac really is an integrated boat, So like many other engineering types that are working on this forum.... it is a platform for me....
now for the preferred failure modes..... I would prefer the mast to snap before the rigging, or the hull conections, I would prefer the steering to break inside the boat (so I dont have to hold onto the rudders again to steer), I will design an emergency tiller bar which connects to the steering bend bracket to give me a backup tiller.. ( looks like the Edson tilting radar mast bracket 2 3/8" is perfect for this application) and a 3ft long vertical handle seems to provide plenty of torque, and does not hit the engine.
So .. I understand your intent..and concern about repowering, But it can be done safely.. Would be really nice if Roger shared some of his hull structural design analysis for those of us who want to re-engineer some items. seems he could get come free engineering out of the deal... oh thats right.......HE DOESNT MAKE a 26X anymore..
so, I will gladly change structural design info of transom mods for someone who comes up with a way to reinforce the mast connection.. cuz I will have to wait a year before I'll have time...
enjoy all, for me its back to measuring
Last edited by waternwaves on Wed Nov 24, 2004 10:10 pm, edited 1 time in total.
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Jeff Ritsema
- First Officer
- Posts: 204
- Joined: Tue Sep 28, 2004 10:09 am
- Location: Grand Rapids, Michigan
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Frank C
Hmmmm. I recall an adage about a pot and a kettle ??Bobby T.(26X w/TLDI 90) wrote: . . . plus, as you've heard time and time again ... "you'll void your warranty".
" . . . hull structural design analysis . . . " ???waternwaves wrote: ... Would be really nice if Roger shared some of his hull structural design analysis for those of us who want to re-engineer some items.
Most boat builders start in a garage, then when they're really, really successful, they can move to a double garage. I doubt that any but Hunter, Beneteau and Catalina know what "design analysis" IS, much less have done any. Surely you jest! Macgregor??? Surely!!!
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Bobby T.-26X #4767
- Captain
- Posts: 906
- Joined: Mon Jan 05, 2004 10:48 am
- Sailboat: MacGregor 26X
- Location: Oceanside Harbor, CA