osprey splash over transom query

[beerbelly]

hi out with me osprey eagle today and every time I stopped there was water sloshing around the transom so while underway I looked around and I have a lot of water spraying up around the tube cones and up the transom . on one side the top of the transom has like a lip that directs the water backwards but on the starboard side the lip has been cut away to allow an aux outboard and the waters piling over there. is this just a trait of the osprey and something ill have to live with or is there possibly something else wrong .the boat seems to ride great otherwise straight and true .the outboards a contra rotation offset the correct amount but I cant see how that would cause this, a friend out with me said he thought I had quite a rooster tail going on

[Chris]

What do you have hanging off the transom... any transducers. Is the aux clear of the water when you are running at speed. ?

[pilotwillie]

Sounds like outboard might need lifted, very similar to what I first had. I lifted mine up 2 holes which stopped the rooster tail and associated splashing over the transom. On my Viper the transom lip is still intact on the stbd side but I removed part on the port side for an aux outboard. No water comes over at all anymore. Trial and error as most RIB / engine / weight set ups are all slightly different.

[beerbelly]

thanks there is no aux fitted at the moment there is a small transducer but its on the starboard side and it splashes both sides. the outboard has already been lifted as there is a gap of about 30mm between transom top and the outboard saddle and im not sure how much higher it can go without having to alter the transom

[Chris]

With the engine trimmed fully in (down) Where is the engines Vent plate (or cav plate) in relation to the bottom of the transom. Can you take a picture of the back of your boat at prop level so we can see ?

[beerbelly]

Thanks I'll do that tonight when I get in from work

[beerbelly]

ok so I finally managed to get some pics and its looking like my outboards to low but its already mounted high on the transom if I lift it more to get the cav plate level I'm going to have the saddle two and a half inches above the transom top pics to follow when I manage to upload them

[beerbelly]

[Xk59D]

that wouldn't bother me in the slightest....put a 2.5" bit of wood under it if it bothers you or glass it in if it really bothers you.

my own engine is probably similar (bit less maybe to be fair) above the transom if it makes you feel any better

[beerbelly]

it does thanks. to get it at the correct height i am going to have to lift it the last 2 holes then thats it it cant go any higher without drilling new holes in the transom.i wonder if this outboard has an extra long leg but to be fair its running like a swiss watch at the moment so im quite keen to keep it and the rib apart from the splash is driving great

[Chris]

Ideally you want the vent plate about 1-2" above the bottom of the transom (depending on prop). So looking at your ruler I think you need to lift at least 2.5" and I would think with two holes left you only have 1.5" to go.

Can you take a picture of the transom from the inside showing engine position. It may be you have an XL shaft on a 21" transom which would explain your issue.

[beerbelly]

will do this was the transom measured from the top.where would i measure the outboard leg to determin the length

[beerbelly]

i have just had a look at the vin plate and the leg is UL (i m assuming that ultra long) looks like i may just have to put up with the splash. although i could try it on its highest setting

[Chris]

Originally Posted by beerbelly

i have just had a look at the vin plate and the leg is UL (i m assuming that ultra long) looks like i may just have to put up with the splash. although i could try it on its highest setting

The transom is 22" so it is designed for a standard 20" Long shaft.

You may be able to change out the leg and drive shaft for a shorter one. You'll never get the best performance out of an Eagle with the bottom of the leg buried in the water. Definitely worth looking at ways to resolve.

As well as splashing you may well find that the RIB tends to lean to port and also your fuel consumption will be higher and your speed lower...

[beerbelly]

the outboard is a contra rotating unit offset to port and it seems to run true and straight.its topping out at 39 knotts on flat water.any idea where i could get the parts to convert it to a shorter leg its a 130 yamaha v4. what about a jack up plate from america although im not sure i like the thought of that

[Chris]

Originally Posted by beerbelly

the outboard is a contra rotating unit offset to port and it seems to run true and straight.its topping out at 39 knotts on flat water.any idea where i could get the parts to convert it to a shorter leg its a 130 yamaha v4. what about a jack up plate from america although im not sure i like the thought of that

a 130 Yamaha (guessing its a V4 2 stroke) should push that Eagle to 45 knots.

With your engine being mounted to port already it will need to be a Contra rotating one which wont be easy to find, although ebay would be a good place to look. I should imagine its the same leg as a 115 and possibly 150 however don't quote me on that.

All depends on how far you want to go. If it were me I would source a longshaft standard rotation, remove the engine and fill the holes (properly) and then refit the engine with some starboard offset.

If you are comfortable doing this yourself you should be able to find the parts to do all this and then hopefully manage to sell your XL or UL shaft parts to recover most of the cost..

A nice winter project perhaps !.

[Chris]

This is a useful resource for looking up parts and seeing what other models the gearboxes were fitted to.

http://www.boats.net/parts/search/Ya...ard/parts.html

[beerbelly]

thanks i appreciate your input