long shaft on a 15" transom?

lowpro · 08 February 2016, 12:22

First post. I have 20" but my boat calls for a 15". I have a 11 ' PVC Zodiac Active V. Anyone ever modify their transom for this?
I am going to run it with the 20" to see how it handles and go from there.
I was thinking on fabricating a bracket out of stainless and starboard and bolt to the transom but would be stoked to see if anyone has done this before?

I don't need to go fast just get on plane and be safe. I am kinda stuck with the 20" cause I use it as a kicker on my 24.

office888 · 08 February 2016, 12:24

It places undue stress on the transom due to the enhanced "levering" motion.

But, if you really want to take that approach, this is your best bet:
Mini-Jacker™ Jack Plate | T-H Marine Supplies

lowpro · 08 February 2016, 13:31

That was fast, thanks Richard! That looks simple enough to me, done.

jeffstevens763@g · 08 February 2016, 13:51

Quote:

Originally Posted by office888

It places undue stress on the transom due to the enhanced "levering" motion.

But, if you really want to take that approach, this is your best bet:
Mini-Jacker™ Jack Plate | T-H Marine Supplies

it states 3 inch vertical offset do you think it could be pushed to 5 inch looks quite a substantial plate ?

jyasaki · 08 February 2016, 15:34

Quote:

Originally Posted by jeffstevens763@g

it states 3 inch vertical offset do you think it could be pushed to 5 inch looks quite a substantial plate ?

That puts you 2" low, which is a lot better than 5".

The plate says it rated for a 35HP; I doubt you're anywhere near that with an 11' boat. I'd say it would be fine. In truth, assuming we're talking less than half the rating, I'd say mount the plate a couple of inches high and you're in the sweet(ish) spot.

jky

lowpro · 08 February 2016, 17:19

All thanks, already ordered it. Looks like with extra holes on the transom flanges will allow me to set it up to my desired height. I will post pics after I get it all set up. It's a 20hp.

lowpro · 09 February 2016, 04:18

Quote:

Originally Posted by office888

It places undue stress on the transom due to the enhanced "levering" motion.

But, if you really want to take that approach, this is your best bet:
Mini-Jacker™ Jack Plate | T-H Marine Supplies

Had to look up "levering" and the example was - "the old man was levering his way up out of the chair" Makes sense now, gotta good laugh out of that one. I have been told the long shaft will create some stress on the transom glue and welds. Thanks for the tip on the Mini-Jacker and I will keep an eye on levering.

jeffstevens763@g · 09 February 2016, 07:15

not familar with your boat but you could go with two struts from the transom to the deck as extra support to counteract the leverage, an engineer could work out the extra stress for position of the struts, if it were me i would put two in with barrel screws so they can be adjusted exactly anyway.

cheers

office888 · 09 February 2016, 12:19

Quote:

Originally Posted by lowpro

Had to look up "levering" and the example was - "the old man was levering his way up out of the chair" Makes sense now, gotta good laugh out of that one. I have been told the long shaft will create some stress on the transom glue and welds. Thanks for the tip on the Mini-Jacker and I will keep an eye on levering.

The Acti-V has a welded transom.

It will probably not be a concern, so long as the wood is kept from rotting. Zodiac used an aviation grade marine plywood for the transom, so it is very high quality and very strong, but if the coating is allowed to peel off, then the wood is unprotected.

Fenlander · 13 February 2016, 09:25

>>>The Acti-V has a welded transom.

I ask because I'm interested... not to say you're wrong... how do they weld PVC to wood?

jeffstevens763@g · 13 February 2016, 10:28

Quote:

Originally Posted by Fenlander

>>>The Acti-V has a welded transom.

I ask because I'm interested... not to say you're wrong... how do they weld PVC to wood?

Possibly a composite transom David I would think one of the many plastics. Direct plastics in Sheffield have a good site explaining all sorts of products and there application.

Cheers

dave3235 · 13 February 2016, 10:31

Quote:

Originally Posted by Fenlander

>>>The Acti-V has a welded transom.

I ask because I'm interested... not to say you're wrong... how do they weld PVC to wood?

Hi all

I found a post under (sib transom strengtheners) it shows what stuff and how to make what it says,not sure how to link the post but am sure someone can paste it in.

Fenlander · 13 February 2016, 11:29

>>>Possibly a composite transom David

The Honwaves are ply between outer GRP and have nice thick strong transoms which I've always liked but I think they are the only SIB transoms that are other than just wood.

I assume you mean a plastic composite which isn't the case with UK Zodiac Cadet/Acti-V's... they have painted plywood transoms of a (to me) rather minimal thickness. I've had two that were fine at 10+yrs old but one that de-laminated within a week of use!

jeffstevens763@g · 13 February 2016, 11:56

My Mercury is ply with what looks to be a thin plastic film bit strange really possibly sprayed on I don't really know how that's glued or heat sealed to the transom again not sure the rest of the tube is heat bonded.
We have a SIT inflateable at work made in the UK it has a plastic transom possibly HDPE boat is called a resicraft 5m air floor.

Cheers

Fenlander · 13 February 2016, 12:08

Thanks for the info Jeff... I'm not well up on the small "commercial" brands so it's interesting to know that and have a look round their website.

On at least two of my Zodiac Acti-V's the transom did look like there was evidence of "spot weld" type fixings and it always puzzled me.

dave3235 · 13 February 2016, 12:19

Quote:

Originally Posted by Fenlander

Thanks for the info Jeff... I'm not well up on the small "commercial" brands so it's interesting to know that and have a look round their website.

On at least two of my Zodiac Acti-V's the transom did look like there was evidence of "spot weld" type fixings and it always puzzled me.

Hi all

Here is the link.

Sorry didn't work

jeffstevens763@g · 13 February 2016, 12:44

Quote:

Originally Posted by Fenlander

Thanks for the info Jeff... I'm not well up on the small "commercial" brands so it's interesting to know that and have a look round their website.

On at least two of my Zodiac Acti-V's the transom did look like there was evidence of "spot weld" type fixings and it always puzzled me.

The SIT stuff is mainly for rescue services we bought one as a safety boat 5m 80kg the floor has a boot lace holding it in and an inflatable keel all pump up together not keen on the boat myself as the tubes are not high enough for me as the floor is well up and convex but for rescue spot on with good carrying capacity.spot welding I can see that may be used for set up during manufacture,something that might interest you I started a thread welding HDPE I bought a hot air welder interestingly on you tube they show fixing patches with it on PVC fabric heating and using a roller to flat out.
I am going to buy some cheep fabric and have a play when I have time,done some welding with it and it's spot on would be very easy to make up boxes,consoles bespoke to your needs.

Cheers

lowpro · 13 February 2016, 23:33

The bottom of the transom is definitely glued together, but not so much on my boat after taking out the floor and inspecting. The transom itself looks like it is possibly a plastic dip or just painted. I fixed the one and only hole and still good after 3 days, also put in some D-rings for surfboards. Next step is pull up the entire bottom of the transom, clean, re-glue. Oh yeah, also put on the mini-jacker and got it up to 5". Seems way solid but I am concerned about rolling it up. I think I will have to make a canvas cover with padding for mini, jacker.

lowpro · 13 February 2016, 23:35

More pics...

office888 · 14 February 2016, 01:28

Quote:

Originally Posted by Fenlander

>>>The Acti-V has a welded transom.

I ask because I'm interested... not to say you're wrong... how do they weld PVC to wood?

They don't... They weld through the wood.

There's about 20 plastic rivets that are ran through holes in the wood. If you stare very closely, you can see the little dimples in the plastic.