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New Mirage Drive Spine http://www.hobie.com/forums/viewtopic.php?f=11&t=48473 |
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Author: | KayakingBob [ Sun Jul 14, 2013 9:28 pm ] |
Post subject: | Re: New Mirage Drive Spine |
Another Great post Roadrunner! |
Author: | mingle [ Sun Jul 14, 2013 10:05 pm ] |
Post subject: | Re: New Mirage Drive Spine |
Very informative post - thanks! |
Author: | RHale [ Mon Jul 15, 2013 6:55 am ] |
Post subject: | Re: New Mirage Drive Spine |
In my personal experience the new drive fits the drive well poorly and results in a clunk, clunk, clunk, as you pedal. |
Author: | Yakaholic [ Tue Jul 16, 2013 9:40 am ] |
Post subject: | Re: New Mirage Drive Spine |
RHale wrote: In my personal experience the new drive fits the drive well poorly and results in a clunk, clunk, clunk, as you pedal. If the clunking is from the drive fitting loose in the drive well and rocking fore to aft that was also a problem encountered long ago on a few hull variances and the mirage drive. I believe several owners ended up using a small piece of vinyl tubing and used it to both cushion and shim the front tab of the drive. I think the goal many years ago was also to help prevent drive well cracking in boats like the Outback. I know also of some drive and hull combinations that fit too tightly that the fix was to shave off a little of either the forward or aft spine tabs. The plastic hulls and their slight variances in drive well size because of shrinkage while cooling makes "perfect" fits a near impossibility. I'm guessing the 1/8" smaller spine helps people get the drive in easier. |
Author: | Yakaholic [ Tue Jul 16, 2013 9:55 am ] |
Post subject: | Re: New Mirage Drive Spine |
Roadrunner wrote: Perhaps the most noticeable change is the full length skirt. Hobie has attempted to mitigate fin-surge in the drivewell for some time, occasionally with undesired side effects. This seems to have solved the problem well. Keeping the surge out of the well makes the Drive run more efficiently. In this view, you can see the comprehensive coverage of the skirt vs the much smaller Drive Seal. Fitment dimensions are very close. The new spine extends the leading edge about 1/8" deeper for better fin clearance. Length is 1/8" shorter. I suppose this is to insure a better universal fit. In any event, it fits well and works flawlessly with my 2010 Adventure. The only modification necessary for older boats is to cut off the alignment pins. Great post! Questions I take it that with the new spine the rubber Drive Seal is not needed or can't be used? Safe to assume the 1/8" more depth to the leading edge reduces the "fin slap" on the hull we sometimes hear? I'm a little concerned about cutting off the alignment pin. Is the alignment pin not replaceable? Will a newer hull that uses the drive alignment pin have a problem with a pin cut off the spine? (I guess I hate removing something that I may need when I get a new Hobie) Finally do we have a part number for the new spine? Hopefully different from the old spine. I have a cracked spine at the sprocket shaft allen screw so might as well replace it with the new model spine. It is amazing how much water "surge" gets into the Island cockpit via the drive well when sailing and submarining. I have to believe the new spine will improve that situation. Thanks |
Author: | kickboyface [ Tue Jul 16, 2013 10:57 am ] |
Post subject: | Re: New Mirage Drive Spine |
great post, as always, roadrunner. thank you. one additional question ... have you done any of your patented speed tests to see if you're getting a touch more efficiency off the new design? |
Author: | CAP1 [ Tue Jul 16, 2013 7:26 pm ] |
Post subject: | Re: New Mirage Drive Spine |
Interesting. I have a new Revo 13 less than 2 months old and it did not come with the full skirt. I will have to compare which spine I have. |
Author: | atv223 [ Fri Jul 26, 2013 5:46 pm ] |
Post subject: | Re: New Mirage Drive Spine |
Apparently the 2013 kayaks shipped with a mix of drives. My dealer said it was a crap shoot which drive was in with the kayak when he opened it. I got the new one. |
Author: | hayeshaugen [ Fri Jan 17, 2014 9:15 pm ] |
Post subject: | Re: New Mirage Drive Spine |
The alignment pin is removable and does not have to be cut off for incompatible models. Simply rotate it with pliers and drive out with a hammer. The alignment pin is not compatible with the i9s as far as I can tell, perhaps this is the case for all the inflatables and their one piece mounts. |
Author: | Roadrunner [ Sun Jan 19, 2014 3:02 pm ] |
Post subject: | Re: New Mirage Drive Spine |
hayeshaugen wrote: The alignment pin is removable and does not have to be cut off for incompatible models. Simply rotate it with pliers and drive out with a hammer. That's true -- for Drives with non-skirted spines. A close examination of the first picture shows the older spine with pin removed and skirted spine with pin molded in the skirt. These earlier spines may still be shipping with inflatables -- they use a slightly different drivewell which may not fit the skirt. .
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Author: | Jcanracer [ Mon Jan 20, 2014 12:54 pm ] |
Post subject: | Re: New Mirage Drive Spine |
Its interesting that this thread got bumped after 6 months, around the same time as I discovered the difference by accident this weekend. I have two 2013 models, my Revo11 was shipped in January '13 and my Outback was a 2013 year-end clearance model. I grabbed the "wrong" drive and put the newer drive in the Revo and it performed so much better than normal! My older drive makes a clunking sound when I reach full extension on the pedal, but the new drive did not. I previously thought the sprocket needed to be changed, but now I think there is more that I should look into replacing. |
Author: | vilcoyote66 [ Wed Jun 17, 2015 3:30 pm ] |
Post subject: | Re: New Mirage Drive Spine |
Who knows the part number of the old spine/drive? (the old, with the venturi velocimeter hole). (I know that the part number of the new design is 81181001 SPINE NEW 2013) Thanks |
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