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mirage drive blocks. can they be raised http://www.hobie.com/forums/viewtopic.php?f=71&t=63328 |
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Author: | Roadrunner [ Sun Aug 12, 2018 8:28 pm ] |
Post subject: | Re: mirage drive blocks. can they be raised |
tonystott wrote: Sorry, but I have difficulty sgreeing with your logic. Tony, perhaps I didn't communicate well. I agree there is no benefit of raising the rear lip. I simply meant to suggest the possibility of building it forward to close the gap (shown in the first pic above). I wouldn't do it that way unless there were alignment issues (where Drive nose is pointing too far down).1. Pedal forces are concentrated on the FRONT lip. Only if the front Drive tongue contacts it. 2. Building up the rear of the socket will INCREASE forces on the front lip. Sorry, I don't follow you on this. I'm not sure wht the "rear of the socket" is. 3. In order to seal the leak, it appears necessary to build up the front lip during the repair. Agreed. 4. This will result, if nothing else changes, in greater pressure on the front lip due to the retaining "axle" If you shave off the underside of the Drive front tongue, space is created for the repair. There should be no static pressure at all. 5. Raising the "axle" by shimmimg the drive mount will lessen pressure on the front lip, Raising the axle by shimming risks insufficient fin clearance under the hull, requires extra work and is not necessary considering the alternative you mention in the next line. OR shaving off some of the front of the Miragedrive to accommodate the raised surface of the fron lip. I see absolutely no benefit in raising the rear lip. Agreed. As you can clearly see in the second pic, the rear of the Drive is resting squarely against the drivewell. It is not touching the front lip at all -- nothing but air is touching the front of the drivewell, including the front lip. The Drive pivots around the drum axle. It is designed to make first contact with the "lip" at the front of the drivewell. If the front Drive tongue is too high , it will pivot against the rear "lip" as it rotates further (as pictured). I have a Drive that does this, so there is no logic involved. I had occasion to work with another forum member with a PA who had this scenario and developed a leak in the rear of the drivewell where the blue arrow points (3rd pic). We applied the patch as I suggested here with the adhesive I suggested here and resolved the issue. So all the above recommendations were based on experience, not logic. This is just my opinion as an option to attempting to repair the front lip. I wish SI every success however he decides to handle the problem! |
Author: | WAVERIDER [ Mon Aug 13, 2018 4:11 am ] |
Post subject: | Re: mirage drive blocks. can they be raised |
I am interested in this as I have an old 2006 adventure hull with the same issue. I haven't bothered to repair due to lack of faith in repair. However I am thinking of turning it into mainly a paddle yak, hence not stressing the repair. This mod would allow me to still use the drive as a secondary option for occasional use. |
Author: | Sardinian Islander [ Thu Aug 16, 2018 12:44 am ] |
Post subject: | Re: mirage drive blocks. can they be raised |
in this moment the leak is fixed with plastic welding but I am not using the rear pedal. i removed half of the lip of the pedal but the quantity of added plastic it too high and the drive still doesnt enter properly. Raising the click and go is therefore necessary. I am waiting from Amazon the proper tool cause here in europe we cannot find easily a 3/14 inch ball allen! after i will raise the block I know that, as you said. there will always be a risk that the leak with come again. I thought to create a sort of "shaped" glove with resin that should cover that area of the drivewell. this resin will not attach the drivewell but after shaped it could be glued there. with this sort of shaped glove i should get 2 results: 1. the mirage drive will not hit and damage the plastic but will hit the resin. 2. since the resin is shaped the front force when u pedal will not go all in that damn small point but will be distributed on a larger area of the front drivewell. what do you think about it? |
Author: | tonystott [ Fri Aug 24, 2018 5:39 pm ] |
Post subject: | Re: mirage drive blocks. can they be raised |
Roadrunner wrote: tonystott wrote: Sorry, but I have difficulty sgreeing with your logic. Tony, perhaps I didn't communicate well. I agree there is no benefit of raising the rear lip. I simply meant to suggest the possibility of building it forward to close the gap (shown in the first pic above). I wouldn't do it that way unless there were alignment issues (where Drive nose is pointing too far down).1. Pedal forces are concentrated on the FRONT lip. Only if the front Drive tongue contacts it. 2. Building up the rear of the socket will INCREASE forces on the front lip. Sorry, I don't follow you on this. I'm not sure wht the "rear of the socket" is. 3. In order to seal the leak, it appears necessary to build up the front lip during the repair. Agreed. 4. This will result, if nothing else changes, in greater pressure on the front lip due to the retaining "axle" If you shave off the underside of the Drive front tongue, space is created for the repair. There should be no static pressure at all. 5. Raising the "axle" by shimmimg the drive mount will lessen pressure on the front lip, Raising the axle by shimming risks insufficient fin clearance under the hull, requires extra work and is not necessary considering the alternative you mention in the next line. OR shaving off some of the front of the Miragedrive to accommodate the raised surface of the fron lip. I see absolutely no benefit in raising the rear lip. Agreed. As you can clearly see in the second pic, the rear of the Drive is resting squarely against the drivewell. It is not touching the front lip at all -- nothing but air is touching the front of the drivewell, including the front lip. The Drive pivots around the drum axle. It is designed to make first contact with the "lip" at the front of the drivewell. If the front Drive tongue is too high , it will pivot against the rear "lip" as it rotates further (as pictured). I have a Drive that does this, so there is no logic involved. I had occasion to work with another forum member with a PA who had this scenario and developed a leak in the rear of the drivewell where the blue arrow points (3rd pic). We applied the patch as I suggested here with the adhesive I suggested here and resolved the issue. So all the above recommendations were based on experience, not logic. This is just my opinion as an option to attempting to repair the front lip. I wish SI every success however he decides to handle the problem! Roadrunner, my comments (NB I have no engineering qualifications) reflected my belief that the only areas of the hull experiencing forces generated by forward pressure on the Miragedrive pedals are 1) Strong downward force from the drive on the front lip of the drivewell 2) After maximum load is on the front lip, there will be upward force on the drive axle. There will be zero pedalling forces applied to the rear of the drivewell |
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