aft lift prop?
09-02-2010, 08:46 AM
#11
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Nope, it's actually one of the latest ever built, model year 07.
But the principle is pretty much valid for any V hull with a single screw: all other things being equal, a RH prop introduces a list to port, and a LH prop does the opposite.
It's also intuitive, if you think about it: the lower half of the prop is the one which "grabs" more water, and with a RH prop the lower half of the prop "pushes" the boat to rotate counterclockwise (looking at the boat from astern) around its longitudinal axis.
This applies also to boats with the outdrive installed deep in the water, but the effect is even more relevant when the outdrive is rather high, as it normally is on a 27 Fever.
On mine for instance the X dim is 19", which means that the prop shaft is only 2" 13/16 under the hull bottom, because on Bravos the distance between the engine shaft and the prop shaft is 21" 13/16.
But the principle is pretty much valid for any V hull with a single screw: all other things being equal, a RH prop introduces a list to port, and a LH prop does the opposite.
It's also intuitive, if you think about it: the lower half of the prop is the one which "grabs" more water, and with a RH prop the lower half of the prop "pushes" the boat to rotate counterclockwise (looking at the boat from astern) around its longitudinal axis.
This applies also to boats with the outdrive installed deep in the water, but the effect is even more relevant when the outdrive is rather high, as it normally is on a 27 Fever.
On mine for instance the X dim is 19", which means that the prop shaft is only 2" 13/16 under the hull bottom, because on Bravos the distance between the engine shaft and the prop shaft is 21" 13/16.
BTW...I spent some time on Italy's west coast betwenn Naples and Rome...where are you located?
Last edited by Thunderstruck27; 09-02-2010 at 02:09 PM. Reason: add text
09-02-2010, 10:06 AM
#12
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huh never thought of that your good mapism , also makes sense . i have talked to a few people that have let me know that fountain 27 's came with left hand props especially my years (before steps) and that they work better with them and are more efficent . which is why i want to try one , not to disrespect bblades but a bravo 1 left hand prop is f'n expensive and i have found these powertech ofx props to work on other big single screw boats just not fountains so being that they are $410.00 i figure why not !
09-02-2010, 04:55 PM
#13
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Of course there are other factors affecting any boat behaviour, but how the same boat which lists to stbd with a RH prop can run flat with a LH prop, that's beyond me.
But surely around here there are folks who are much more expert than myself on this. I'd love to hear from them.
Re. your last question, I'm located in northern Italy, and I enjoy my Fever on lake Como.
If you're planning to return around here in the future, just let me know and we could go for a ride.
09-02-2010, 05:10 PM
#14
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Never tried a RH prop though, but I guess it couldn't get any better. She runs flat and stable, and reaches 70mph when lightly loaded, with the stock 496ho.
On the other hand, there are guys who run a RH prop and reported awful results after trying a LH prop, as for instance SDFever in this thread.
There's no real substitute for testing, I reckon.
09-03-2010, 02:26 PM
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Actually, also mine, which is stepped, came from the factory with a LH 24" Bravo I, and I'm now running a 26" labbed Bravo I (also LH).
Never tried a RH prop though, but I guess it couldn't get any better. She runs flat and stable, and reaches 70mph when lightly loaded, with the stock 496ho.
On the other hand, there are guys who run a RH prop and reported awful results after trying a LH prop, as for instance SDFever in this thread.
There's no real substitute for testing, I reckon.
Never tried a RH prop though, but I guess it couldn't get any better. She runs flat and stable, and reaches 70mph when lightly loaded, with the stock 496ho.
On the other hand, there are guys who run a RH prop and reported awful results after trying a LH prop, as for instance SDFever in this thread.
There's no real substitute for testing, I reckon.
09-03-2010, 04:08 PM
#16
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Was anything discussed about the actual picth of 26 Bravo when you bought it? I don't know for sure, but I've heard that Bravo I's are actually 2 pitchs less than what is stamped on them. Also, do you know anything about the Bravo I being a bow lift or stern lift prop?
But according to what I read around here, the Bravo I should be 1" shorter than its nominal pitch, not 2".
And as I'm told, it's a good all-round prop. Probably neither the absolute best for top speed (Hydro?), nor for acceleration (Maximus?), but a very good compromise.
I had a talk with Brett of BBlades after I bought the boat, but when I gave him my numbers he was honest enough to tell me that I'm already getting all I can expect, from this hull with stock power.
