PDA

View Full Version : how should i mount the old girl



ozzyfisho
30-06-2003, 04:26 AM
my 18ft beast sit low at the rear. in a decent swell waves come over the transom. if i pod mount the outboard will this make the rear end sit a bit higher in the water.

also if i move the bateries up front and run long cables down to the the motor will i loose any starting power.


ozzy

BS
30-06-2003, 04:50 AM
Adding a pod should provide more positive bouyancy and also help you stay on the plane at lower speeds offshore if it's built right. Make sure you get a professional to do it - could be costly depending on what construction your boat is.... ally or glass ???

If the batteries are mounted up on some shelves in the transom you shouldn't have any probs with water (if that's why you want to move them forward for ???).

Big_Kev
30-06-2003, 11:47 AM
Oz with a Post Heading like that I thought you were on the wrong web site for a minute.LOL
Cheers Kev.

ozzyfisho
30-06-2003, 12:09 PM
Oz with a Post Heading like that I thought you were on the wrong web site for a minute.LOL
Cheers Kev.

this coming from a guy named "reel hard" haha ha

bs she's a fibreglass rig and im in the position to design and draw plans myself. my only doubt is. more weight, further back would give more leverage over the center of gravity and therefor pull the back down more. or would the center of gravity move further down the boat putting more weight at the front, therefor making the boat sit morte level.

ps ive had a dozen scotches so if i dont make sense i edit this in the morning.

ozshy fisso

caveman
30-06-2003, 02:04 PM
from behind is good that way you don't get slapped in the face

ba229
30-06-2003, 02:47 PM
or smell her breath ;D ::)

peterbo3
30-06-2003, 03:20 PM
Evening OZY,
I have drunk half a bottle of cheap bourbon so we start out even.
If you pod mount your engine on a S/S frame as some tend to do , your centre of gravity will indeed #move towards the stern & the waves will really come over the back as your stern will tend to sit lower because your O/B will exert more downward force as there will be no bouyancy beneath it..
Should you glass a full width pod with sealed bouyancy
chambers to the stern and mount your engine on this, then you are effectively increasing the length of the boat & this will also move your C of G rearward. However, I think your real need is more bouyancy at the stern to handle the weight of the motor and the full width pod should do this.
The addition of a pod can cause huge stresses to the original hull & it may well be money not wasted to get an opinion from a glass boat builder.
There are other considerations such as invalidating your insurance & the need for a longer trailer.
If you want to move your batteries forward for better weight distribution you may need to go to much heavier cable to avoid a significant voltage drop on starting. If they are up front they tend to get banged around a bit in rough weather .

NQCairns
01-07-2003, 04:16 AM
Hi Ozzi Peter is right you will make the problem worse, you may even end up swamping the O/b dependant on how bad your problem is allready, a hull extension pod with floatation is the only way to go if you want the best of both worlds or a large engine only pod that displaces water can work to some degree but it will make the boat less stable at rest.I am in the process of slowly doing up a boat which I will pod but having never seen her in the water, I am stumped about waht to do and will just have to make a best guess in the end and live with it I spose. If you do pod post your thoughts I for one would be interested. Nq

ozzyfisho
02-07-2003, 01:09 PM
thanks guys

i had intended to use a sealed aluminium pod bolted through the transom. i dont think the extra weight or extra boyancy will make any substantial diff (probly cancel each other out leaving me back where i started). i may have to fill my positive floatation chambers with helium that should do the trick. oh well back to the drawing board (literally). once again thanks anyway.

blaze
02-07-2003, 05:40 PM
Hi all
I know a bloke local that is just finishing off a pod (alliminium on 18 foot glass) see if I can get some pics and post report when finished
cheers
blaze

drevil
03-07-2003, 02:35 AM
Out of curiosity, what size motor do you have on the back?

BS
03-07-2003, 05:42 AM
Not sure of your boat or motor size, but huge stresses are put onto any transom as you "get out of the hole" and now that stress will be applied both to the mountings and the pod (more than what the transom was originally designed to take).

Your Insurer may reject any future claim if you have not obtained their prior approval - every client has a duty of disclosure to their Insurer which you will breach. Depending on the company you have insured your boat with, they may also be able to suggest repairer's capable of doing such work.
Glassing a pod will be more expensive but I think is definitely a better way to go.