View Full Version : Negative tail rocker
25th November 2009, 04:52 AM
Has anybody experimented with negative tail rocker? A polyethelene Surf Partner Dry  I used in the 80's warped. To be more precise the highly flexible skin, and chop pounding, crushed the poor quality foam in the tail part. The double concaves became so deep that they almost met the upper deck, and the tail bent slightly downwards. The incredible thing was it became incredibly fast, and dangerous! On a memorable offshore gale [flat water inshore] day, with a Vinta fully battened 5.5, it locked into a screaming close reach, which I didn't how the hell to get out of! [Locked in straps and harness, and frozen with fright.] I scrapped the ruddy thing - couldn't keep up with the cost of disinfectant for the wetsuit! I wonder, though,was the whole board just skimming the surface with only the negative rocker tail [and fin] in contact? Is it a valid concept for speed boards? ------[Sorry about lack of paragraphs. I can't work these computer thingy's properly yet.]
25th November 2009, 02:12 PM
This is very interesting, but you should stop smoking Marijuana
25th November 2009, 05:45 PM
Sorry Viking, but it's Raquel Welch who floats my boat - it's her eyes you know! [ I once nearly sued her for aggravated injury when she invaded a dream and I almost fell out of bed in excitement.]
I do have a photo of that day [but don't know how to post it] just as the board reared up and crashed. It did earn me the the 'Flying Vinta' nickname - a couple of peeved Neil Pryde powered buddies hurled that one about! The point is, though, that it DEFINITELY was faster once the concaves deepened, and the tail sagged. It just became too difficult to handle. The impression was, of a flat stone skimming the surface of the water but still in contact, rather than the usual rearing up anf riding off the fin. The bent down tail seemed to hold the board down, so just what IS the fastest bottom shape for a board?
25th November 2009, 10:32 PM
Sounds like a Hypersonic to me ;-)
27th November 2009, 02:18 PM
No, I persist, sounds like marijuana for me
27th November 2009, 04:33 PM
What I take, Viking, is obtainable at all good branches of Tesco stores. It comes in natty orange PLASTIC barrel shaped containers with the word OVALTINE clearly stated! Since you insist,however, I have noticed my 'PING' rate [sudden brainwaves] increase after the change over from proper glass jars. [My tou, in my youth I regularly had a dozen 'pings' a day but inevitable decay meant I was lucky if it happened more than twice a month - until the universal introduction of plastic containers.]
How's this for an idea? In the 70's I recall there was a spate of Phaser bottomed surf boards. [Half tennis ball sized shapes pressed into the blank before glassing.] I don't remember the reasoning, and it didn.t seem to catch on but maybe Starboard should reinvent the idea for 2011! It could be the next big thing! ]Now excuse me while I go and have a snigger.]
14th January 2010, 07:12 PM
when i bought my '02 acid77 wood, it had a negative tail kick!
talked with scott mckercher and he said it was not a design feature, but some kind of production failure..
anyway, before i sanded the tail to a 'normal' slight positive rocker, i experienced following on the water:
- board was very fast and early planning
- it was exceptionally good in biting high speed tight carves (similar to bottom turns)
after modification, the board was still fast and turny, but lost this special turbo-hypermode!
now i got it back (more drive in carves) by installing twinser fins in the board..
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