Bad Porpoise
#11
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I have a Lavey 2750 that had a bad porpoise problem over 70 mph. After I put a Whipple on it it really got exciting. I tried different props, 4 & 5 and no help. Finally had the bottom blueprinted and removed a couple lifting strakes and went with a 2" Imco shortie with a Hering 5 blade. Now I can run low 90's with no bounce at all, almost can run it hands off, and no tabs. Very happy but a little poorer.
Sounds fun....and sounds like a bravo eater with that whipple and 5 blade.
#12
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It is quite an improvement for sure- I fought it for 5 years and went back and forth with Lavey, who were no help at all- said it was driver, not the boat. Turns out it was the boat. Now it's fun, and we have gone by a few Bravo's, but there are sure alot more that will go by us. At least we're not bouncing when they do.
#13
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My 270 hallett only porpoises in flat to semi flat water. Before the engine upgrade it would porpoise around 68 to top speed of 75mph. I purchased a 5 blade Maximus and it helped a little but still porpoised in flat water (The five blade did carry the bow a little higher at higher speeds).
Talked to Hallet and received no useful info.
Since the upgraded HP (800hp and -2 IMCO drive) the boat still porpoises around 70 to 80 in flat water and goes away up to about 90mph. I currently have a stock 4 blade 32p prop with the engine upgrade and won't put on a 5 blade since the outdrive (XR) won't last with that much HP and bite from the prop.
I personally think the Hallet 270 is a heavy boat for it's size and to try and maintain the bow up at the higher speeds in smooth water is asking a lot from the prop (bow lift). I guess that is why the Hallet rides so smoooooooth in rough water. Take the good with the bad. I've have to admit the boat handles like a dream above 80 and besides the inconveince of the propoising in flat water it's very stable.... I do notice that the porpoising reduces with less trim which is expected since the prop is not trying to lift the bow as high.
Talked to Hallet and received no useful info.
Since the upgraded HP (800hp and -2 IMCO drive) the boat still porpoises around 70 to 80 in flat water and goes away up to about 90mph. I currently have a stock 4 blade 32p prop with the engine upgrade and won't put on a 5 blade since the outdrive (XR) won't last with that much HP and bite from the prop.
I personally think the Hallet 270 is a heavy boat for it's size and to try and maintain the bow up at the higher speeds in smooth water is asking a lot from the prop (bow lift). I guess that is why the Hallet rides so smoooooooth in rough water. Take the good with the bad. I've have to admit the boat handles like a dream above 80 and besides the inconveince of the propoising in flat water it's very stable.... I do notice that the porpoising reduces with less trim which is expected since the prop is not trying to lift the bow as high.
#15
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My 270 hallett only porpoises in flat to semi flat water. Before the engine upgrade it would porpoise around 68 to top speed of 75mph. I purchased a 5 blade Maximus and it helped a little but still porpoised in flat water (The five blade did carry the bow a little higher at higher speeds).
Talked to Hallet and received no useful info.
Since the upgraded HP (800hp and -2 IMCO drive) the boat still porpoises around 70 to 80 in flat water and goes away up to about 90mph. I currently have a stock 4 blade 32p prop with the engine upgrade and won't put on a 5 blade since the outdrive (XR) won't last with that much HP and bite from the prop.
I personally think the Hallet 270 is a heavy boat for it's size and to try and maintain the bow up at the higher speeds in smooth water is asking a lot from the prop (bow lift). I guess that is why the Hallet rides so smoooooooth in rough water. Take the good with the bad. I've have to admit the boat handles like a dream above 80 and besides the inconveince of the propoising in flat water it's very stable.... I do notice that the porpoising reduces with less trim which is expected since the prop is not trying to lift the bow as high.
Talked to Hallet and received no useful info.
Since the upgraded HP (800hp and -2 IMCO drive) the boat still porpoises around 70 to 80 in flat water and goes away up to about 90mph. I currently have a stock 4 blade 32p prop with the engine upgrade and won't put on a 5 blade since the outdrive (XR) won't last with that much HP and bite from the prop.
I personally think the Hallet 270 is a heavy boat for it's size and to try and maintain the bow up at the higher speeds in smooth water is asking a lot from the prop (bow lift). I guess that is why the Hallet rides so smoooooooth in rough water. Take the good with the bad. I've have to admit the boat handles like a dream above 80 and besides the inconveince of the propoising in flat water it's very stable.... I do notice that the porpoising reduces with less trim which is expected since the prop is not trying to lift the bow as high.
#16
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The 5 blase was labbed by Mercruiser which had the diameter turned down to about 15 1/4" from the stock diameter. My prop slip went down but I think the my XR gears paid a price for the five blade prop. I took the new drive apart to install the -2 lower unit and noticed some wear issues on the gears. I only had a couple of hours on the drive and most of them was with the five blade. I was always easy coming out of the hole and changed my drive oil every 10 hrs. The marine shop (GT marine) even gussed that I was running a five blade from looking at the gears when they were taking it apart. I never told them I had a five blade and the prop was already sold.
Hope this info helps....
#17
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It is quite an improvement for sure- I fought it for 5 years and went back and forth with Lavey, who were no help at all- said it was driver, not the boat. Turns out it was the boat. Now it's fun, and we have gone by a few Bravo's, but there are sure alot more that will go by us. At least we're not bouncing when they do.
Last edited by hotlavey; 01-28-2008 at 06:40 PM. Reason: delete
#18
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#19
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Hallett Fan: I have a new unlabbed 30 pitch Maximus. Ran it once for testing, but like VegasHallett I have been reluctant to put the wear on the XR gears.
Hot Lavey: Where did you get your bottom blueprinting done? I've considered this.
Hot Lavey: Where did you get your bottom blueprinting done? I've considered this.
Last edited by zahndok; 01-28-2008 at 08:42 PM.
#20
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Gears wear. Shavings are normal. Chunks are not. Most wear occurs in the first few hours of usage.
5 blade propellers will not wreck a drive if used in the proper methods and with the proper HP ranges per the drives capabilities.
5 blade propellers will not wreck a drive if used in the proper methods and with the proper HP ranges per the drives capabilities.
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Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]