Hobie Cat Forums

It is currently Sun Oct 19, 2014 9:32 pm

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 14 posts ] 
Author Message
PostPosted: Thu May 15, 2014 2:49 am 
Offline
Site Rank - Captain

Joined: Sun May 11, 2014 5:18 am
Posts: 36
Location: Newcastle NSW Australia
Turbo unit knocking against hull. On AI On full pedal extension. Any ideas? Is it just a matter of bending the horizontal rod in the Top of the rubber fin section?
Ideas welcome.


Top
 Profile  
 
PostPosted: Thu May 15, 2014 11:13 am 
Offline
Site Rank - Captain

Joined: Fri Oct 25, 2013 8:58 am
Posts: 25
Sounds like you just dont have the pedals adjusted right. If its at the end of the stroke farthest away from you when it hits you need to go up a number on the pedal adjustment.


Top
 Profile  
 
PostPosted: Thu May 15, 2014 12:13 pm 
Offline
Site Admin

Joined: Tue May 27, 2003 12:44 pm
Posts: 9122
Location: Oceanside, California
Simple answer. Taking a pedal stroke to the stop is to be avoided.

As noted above... adjust the pedals forward to reduce the chance of the full stroke hitting, then if needed, adjust your technique.

_________________
Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA


Top
 Profile  
 
PostPosted: Thu May 15, 2014 1:50 pm 
Offline
Site Rank - Old Salt

Joined: Sat Nov 05, 2011 1:58 am
Posts: 1523
Location: Forster, NSW, Australia
Further to the above, I should add that due to a hip injury (and probably old age!), I >never< use the full pedal stroke. The beautiful thing about the Miragedrive is that it still works efficiently with less travel, and speed can be identical by increasing cadence. "Bottoming out" by hitting the hull at the end of a pedal stroke is bad for the drive as it causes forces to be applied to components outside their design parameters.

Having said that, however, I felt cramped in the standard seat, with pedals set at full extension, so I fitted a "skipper seat" which raised my backside by 4" and moved me back more than 2". I now use the middle pedal setting.

_________________
Tony Stott
2012 Tandem Island "SIC EM"
www.scenefromabove.com.au


Top
 Profile  
 
PostPosted: Fri May 16, 2014 2:19 am 
Offline
Site Rank - Captain

Joined: Sun May 11, 2014 5:18 am
Posts: 36
Location: Newcastle NSW Australia
Wow what a great forum! Thank you guys for your very generous and prompt support on this knocking issue.
By full extension I meant the pedals at their furthest distance apart. They are actually still on the 4 setting. The knocking only started on about the fourth voyage.

I will apply your advice.
Thank you
Kieran


Top
 Profile  
 
PostPosted: Fri May 16, 2014 3:04 am 
Offline
Site Rank - Old Salt

Joined: Tue Jun 19, 2007 6:14 pm
Posts: 1899
Location: South Florida
You need to get your hull up on sawhorses, or something, and get pictures or a video of what is happening. Something is not right.

Keith

_________________
I sail: Biscayne Bay, Everglades to Cape Romano, Ft Desoto, Cedar Key

"Any intelligent fool can make things bigger and more complex ... It takes a touch of genius and a lot of courage to move in the opposite direction." A. Einstein


Top
 Profile  
 
PostPosted: Fri May 16, 2014 4:57 am 
Offline
Site Rank - Old Salt

Joined: Sat Nov 05, 2011 1:58 am
Posts: 1523
Location: Forster, NSW, Australia
Kieran, The fins will hit the hull at the extreme of their travel (eg when the pedals are furthest apart). This is part of their design. If you move the pedal settings to 5, this should mean that when your leg is straightest, the fin will not quite reach the bottom of the hull.

However, it is possible to bang the fins against the hull with most pedal settings if you are too vigorous on the pedals! The thing to remember is that (as I mentioned earlier), the "stepper" style action of the Miragedrive works just as well with smaller steps, so as long as the fins don't bang on full stretch, there is no need to bring your knees up under your chin at the other end of travel.

I suspect the the problem showed up by about your fourth trip because your pedal stroke lengthened with familiarity, but you didn't notice. That's my theory and I'm sticking to it :D :D

_________________
Tony Stott
2012 Tandem Island "SIC EM"
www.scenefromabove.com.au


Top
 Profile  
 
PostPosted: Fri May 16, 2014 2:49 pm 
Offline
Site Rank - Captain

Joined: Sun May 11, 2014 5:18 am
Posts: 36
Location: Newcastle NSW Australia
What a wealth of knowledge and valued varied perspectives on this wonderful forum. Thank you so much. I shall apply these pointers systematically.
Much appreciated.
Kieran


Top
 Profile  
 
PostPosted: Sat May 17, 2014 6:58 am 
Offline
Site Rank - Captain

Joined: Sun May 08, 2011 6:36 am
Posts: 49
Location: CT
Ciaran….

First of all …. Welcome! You are correct…. This is a GREAT Forum!

I own a TI and am 6'4" 250 and my one son is 6'6" 260 and plays hockey, soooo, as Matt Miller suggested - your pedal stroke can affect the Mirage Drive.
Trying to tell a college hockey player to limit his stride, …. well… Good Luck! Eventually stretched the cables where they couldn't be adjusted.

The symptoms - adjust both pedals to the same number, hold them together and see if the fins are aligned vertical??? Mine were skewed off to the side!

Went to dealer and we replaced the wire cables that have the nut clamped on the ends - back in business!


Top
 Profile  
 
PostPosted: Sat May 17, 2014 6:57 pm 
Offline
Site Rank - Captain

Joined: Sun May 11, 2014 5:18 am
Posts: 36
Location: Newcastle NSW Australia
Thank you so much for sharing. I'm only 6' and 105kg but have strong cycling legs so this could be another factor. Now the wire did cross my mind and was hoping it wasn't bent. Tried the kayak yesterday and there seemed to be less knocking. The left of the two black levers which secure the turbo unit sometimes unlock and the unit rocks around a little. So I made sure to click it closed and the knocking seemed to disappear mostly. Would rather not have to repeatedly click it closed though.
Thanks again.
Cheers
Kieran


Top
 Profile  
 
PostPosted: Sat May 17, 2014 7:55 pm 
Offline
Site Rank - Old Salt

Joined: Sat Nov 05, 2011 1:58 am
Posts: 1523
Location: Forster, NSW, Australia
If either lever comes undone, you can jam the drive in its slot if you pedal vigorously in this condition. I noticed that the levers stick up a little more on the AI, whereas they are flush with the floor on the TI. A friend has modified his AI slightly by drilling a horizontal hole through the top of the levers, and then attaching some light bungee cord to the centre black ring, with small hooks which pass through the holes in the levers. He just has to undo these hooks before trying to remove the Miragedrive. Hope this helps.

_________________
Tony Stott
2012 Tandem Island "SIC EM"
www.scenefromabove.com.au


Top
 Profile  
 
PostPosted: Sun May 18, 2014 1:46 am 
Offline
Site Rank - Old Salt

Joined: Tue Jun 19, 2007 6:14 pm
Posts: 1899
Location: South Florida
Tony is correct--pedaling when the drive is not locked in place risks jamming it. If that happens, it becomes a real problem to get it unjammed; although, even that gets easier w/ practice. It is best to be aware that the drive latches can be accidentally opened and immediately correct them in that event.

Keith

_________________
I sail: Biscayne Bay, Everglades to Cape Romano, Ft Desoto, Cedar Key

"Any intelligent fool can make things bigger and more complex ... It takes a touch of genius and a lot of courage to move in the opposite direction." A. Einstein


Top
 Profile  
 
PostPosted: Sun May 18, 2014 4:35 am 
Offline
Site Rank - Captain

Joined: Sat Mar 24, 2007 10:30 pm
Posts: 32
Hi Kieran,

I'm 6' and I have my Mirage drive set to position 5 in the AI. In position 4 the fins strike the hull.

As others have said make sure you don't accidently unclick the click-n-go. Jamming the mirage drive is a PITA. Using a flat blade screwdriver to push down on the jammed locking lever is the easiest way to get your day back on track.

I really wish Hobie would fix this design fault on the Adventure / AI. I have almost been wiped out several times due to a jammed drive.

Cheers
Hoit


Top
 Profile  
 
PostPosted: Sun May 18, 2014 7:00 am 
Offline
Site Rank - Captain

Joined: Sun May 11, 2014 5:18 am
Posts: 36
Location: Newcastle NSW Australia
Once again thanks for these pointers re design and redesign of the mirage drive. It is greatly appreciated.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 14 posts ] 

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: motoenthusiast and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group