>Can anybody out there tell me if this is a valid solution? Here's the problem:
>I'm running a 20' bowrider with a Merc 4.3LX and a 21" prop. It's very easy to
>over rev this setup, but I need it to pull up a 200 pounder on 1 ski. I don't
>want to lose my holeshot as it stands now, but I don't want to have to be
>constantly watching the tach so's not to over rev, (nor do I want to shell out
>a fortune for a variable pitch prop) My solution: Bolt on a doel fin and go
>back to my 23" prop for top end and fuel economy(if it planes faster, then I
>should get better acceleration with that fin) It would be really great if I
>could get my 56-57 mph top end back with the 23 incher, and still haul up that
>slalom skier. What do you think?
Doel fins (and all the clones) work great in two situations:
1. the boat is stern-heavy, and there is no way to redistribute
2. the boat is underpowered, and re-powering is impractical.
If you need the 21" prop to pull a 200 pounder out of the hole, then your best bet
is to keep it on there, and watch your tach carefully. Otherwise put the 23" prop
back on for best top speed. a 20' bowrider (approx weight ? maybe about 3000 lbs)
with a 4.3 V6 is a marginal combination for deep water starts with 200 lb skiers.
The Doel Fin will lift the stern, but unless that 23" prop will allow the engine
to rev up to it's power curve, your acceleration will suffer, as will fuel economy,
and engine wear.
Best bet is to get your skiing buddy to go on a diet !