kevlacat 5.2 and f60 yammies where did i go wrong

[fly_1]

I have had no dramas with mine either. And Ian, I used to get a bit of water in the front as well, and we traced it to a leaky side window. Water coming in along the side and staight into my forward storage areas. I just sicca flexed them shut, and have had no dramas since. I thought something was wrong Deano !!!!
I was told very very early on that you should check the rear hatches and pods every few months, as plenty of moisture can be sucked in thru the seals on the cheap plastic spinouts.
As far as props go,I have the 15's on mine and after 400 hrs in the last 2 yrs, they have never missed a beat...

[Dean1]

Well well what a difference 250 litres of in your hull can make!! I took mine for a spin today and man what a difference.

I knew I was in for a nice suprise as soon as I launched it. It sat up so much higher in the rear. About 60-70mm.

Gets up straight up on plane now and I got 30kts WOT at 5700- 5800rpm. Cruises very easy 23kts 4800 1.5-1.6 klms/ 1 litre.

Its got that floating feeling back. I'll try to put up a few pics of her in the water.

Fromeo put on 15's 2 3/4 inches from bottom of hull to cav plate check for water in hull and youll get the same figures. Cheers.

[finding_time]

All i can say deano is , About friggin time mate!!!


Fromeo

Deans figures mirror mine and dare i say Trents ( fly1) get the 15k's get them the right height and you'll be very happy!

[Dean1]

Ian I have pics how it used to sit in the water and what a difference.

The pics are 8mp and they wont load. The motors sounded like they were doing it so much easier today, quieter and so much punchier.

I'll look into getting the props shaved a bit. Bring on the hards trips!!

[lippa]

fat mates aye deano?is it the same fat mate that told you ya had water in ya hulls 4 months ago?

good to see its goin well again

[Scaredy Cat]

Has anyone with the 5.2m tried 4 blades,
Thanks to Ian and a trip out through Round Hill Bar in atrocious conditions (only to dump the frames of his fishing expedition), I have parted with my money and am now in the elite K/cat Club, I am running 60 bigfoot Mercs that appear to be over propped with Vengeance 16p, talked to Solas last week and Steve recommended 4 blade/15p.
Any thoughts would be highly regarded, as $1300.00 is a lot of money if little extra is achieved. On Fri in great conditions on Morton Bay, Wot was 50km at 5200rpm, average WOT offshore 38km/h at 5000RPM, seems to dig in excessively and bleed speed in following sea and sluggish response in bar and to plan,

[insideout]

Very interesting question.... for a kc 5.2 is a couple of yammy f60s better than yammy f60 high thrusts? what is the difference? Thanks.

[FNQCairns]

Has anyone with the 5.2m tried 4 blades,
Thanks to Ian and a trip out through Round Hill Bar in atrocious conditions (only to dump the frames of his fishing expedition), I have parted with my money and am now in the elite K/cat Club, I am running 60 bigfoot Mercs that appear to be over propped with Vengeance 16p, talked to Solas last week and Steve recommended 4 blade/15p.
Any thoughts would be highly regarded, as $1300.00 is a lot of money if little extra is achieved. On Fri in great conditions on Morton Bay, Wot was 50km at 5200rpm, average WOT offshore 38km/h at 5000RPM, seems to dig in excessively and bleed speed in following sea and sluggish response in bar and to plan,

Don't do it's bad advice, with the exception of where you are coming from then anything will see you happy, your potential well propped cruse speed which is what the cats are famous for ie the ability to sit at good cruise speed and take on all water till destination) will suffer as will fuel. the extra surace area it will afford is always nice but it's not a fair trade.

With respect your boat is a total dog ATM try not to fall into the trap of anything is better because it probably will be, it's expensive too! save your money. 3 blade 15p with low cup to help get those revs up might be better. Also if the 4 blade props are no cup it might be worth a test but with an eye toward not falling into the anything is better/see you happy. Try not to compromise on reaching full RPM, if you can get there it will all come together.

cheers fnq

[finding_time]

Very interesting question.... for a kc 5.2 is a couple of yammy f60s better than yammy f60 high thrusts? what is the difference? Thanks.

Nup , you need the high thrusts for several reasons but the main one is leg lenght! It keeps the power head out of the water

[finding_time]

Has anyone with the 5.2m tried 4 blades,
Thanks to Ian and a trip out through Round Hill Bar in atrocious conditions (only to dump the frames of his fishing expedition), I have parted with my money and am now in the elite K/cat Club, I am running 60 bigfoot Mercs that appear to be over propped with Vengeance 16p, talked to Solas last week and Steve recommended 4 blade/15p.
Any thoughts would be highly regarded, as $1300.00 is a lot of money if little extra is achieved. On Fri in great conditions on Morton Bay, Wot was 50km at 5200rpm, average WOT offshore 38km/h at 5000RPM, seems to dig in excessively and bleed speed in following sea and sluggish response in bar and to plan,

Scaredycat

Mate Fnq is spot on! As usual ! But you have to do something as at the moment your trying to bite of more water than your engines can chew! Get you Revs at wot to 5800 and you'll get your speed! I haven't had much to do with the big foot mercs but there specs are very similar to the yami's so the performance should be similar! Trent ( Fly1) has tried many differant props from solas but settled on the standard Yami 15k alloy props as they offered the best all round performance! As fnq sais a 3 blade prop with lower pitch may well be the go as they work on the yami's.

Good to see there is another kc in the pba you can start giving that kittycat a run for his money!

ian

[Dean1]

fat mates aye deano?is it the same fat mate that told you ya had water in ya hulls 4 months ago?

good to see its goin well again

Yes Bryan thats correct it was Santa Claus

[Dean1]

Scaredycat

Mate Fnq is spot on! As usual ! But you have to do something as at the moment your trying to bite of more water than your engines can chew! Get you Revs at wot to 5800 and you'll get your speed! I haven't had much to do with the big foot mercs but there specs are very similar to the yami's so the performance should be similar! Trent ( Fly1) has tried many differant props from solas but settled on the standard Yami 15k alloy props as they offered the best all round performance! As fnq sais a 3 blade prop with lower pitch may well be the go as they work on the yami's.

Good to see there is another kc in the pba you can start giving that kittycat a run for his money!

ian

Ye I wouldnt be too keen on the 4 blade Solas Props myself.. I spoke to solas recently and they are doing a 13p 3 blade stainless job that they claim gives you the revs easily with the speed as well. They gaurantee them, if not happy you dont pay. Ive been thinking about giving them a run! Nothing to lose only performance to gain! Solas claim that yamaha "K" series props are a bad design altho im happy with mine now. $1100 for the pair.

[BM]

Scaredy Cat,

Mercury make the best props in the business, hands down. Stick with Merc to get the right props for your rig.

cheers

[Dean1]

Scaredy Cat,

Mercury make the best props in the business, hands down. Stick with Merc to get the right props for your rig.

cheers

BM good call i know a guy with F 60's on a 5.2 kc that had Stainless Mercury Vengenance (whatever their called) props and raved about them. Merc props do fit yammies hey??

[BM]

Merc props fit everything mate! You buy the hub you need to suit your brand of outboard and pop it into the prop. Pretty logical really. Why just make props for your own engines when that same prop can be made to fit every engine.

Since the dawn of boating Merc have spent the most on prop R&D and as such they are the market leader.

Cheers