Grey MTI
09-17-2008 | 07:10 AM
#34
Banned
Joined: Sep 2007
Posts: 12,849
Likes: 3
From: Frankfort,ill
Boat is indeed the CMS boat.
Motors are Merc 1200's. Nothing is visibly altered. Possibly some internal magic, but they are running what appear to be "normal" pulley sizes.
Transmissions are very trick and compact air-shifted 4 speed units. Real gears and dogs - no clutches or sissy stuff. Throttles must be wide open in order for upshifting to be enabled. Shifts are allowed via an ignition interrupter that unloads the transmissions, the dog rapidly shifts out of one gear, sensors count pulses until the dog and mating gear are in correct position, and the dog is slammed home into the next gearset as the ignition receives power again. There is only a 4% ratio difference between each of the 4 gearsets. Sounds like a dirtbike shifting. Waaaaaaa...waaaaaaaaaa...waaaaaaaaa...waaaaaaaaaaa aaaaaaaaa.
Merc Six drives have the skegs cut off and are trimmable, but locked straight. Toe is hydraulically adjustable +/- a few degrees underway.
Boat fired up for the first time ever on Thursday before the Shootout. Boat ran well Saturday for first shot out of the box.
Boat is probably a little heavier than the Mystic.
Motors are Merc 1200's. Nothing is visibly altered. Possibly some internal magic, but they are running what appear to be "normal" pulley sizes.
Transmissions are very trick and compact air-shifted 4 speed units. Real gears and dogs - no clutches or sissy stuff. Throttles must be wide open in order for upshifting to be enabled. Shifts are allowed via an ignition interrupter that unloads the transmissions, the dog rapidly shifts out of one gear, sensors count pulses until the dog and mating gear are in correct position, and the dog is slammed home into the next gearset as the ignition receives power again. There is only a 4% ratio difference between each of the 4 gearsets. Sounds like a dirtbike shifting. Waaaaaaa...waaaaaaaaaa...waaaaaaaaa...waaaaaaaaaaa aaaaaaaaa.
Merc Six drives have the skegs cut off and are trimmable, but locked straight. Toe is hydraulically adjustable +/- a few degrees underway.
Boat fired up for the first time ever on Thursday before the Shootout. Boat ran well Saturday for first shot out of the box.
Boat is probably a little heavier than the Mystic.
ernaehrung004:
09-17-2008 | 10:22 AM
#35
SeaRay Sundancer
Joined: Nov 2005
Posts: 2,914
Likes: 0
From: SW Missouri
Boat is indeed the CMS boat.
Motors are Merc 1200's. Nothing is visibly altered. Possibly some internal magic, but they are running what appear to be "normal" pulley sizes.
Transmissions are very trick and compact air-shifted 4 speed units. Real gears and dogs - no clutches or sissy stuff. Throttles must be wide open in order for upshifting to be enabled. Shifts are allowed via an ignition interrupter that unloads the transmissions, the dog rapidly shifts out of one gear, sensors count pulses until the dog and mating gear are in correct position, and the dog is slammed home into the next gearset as the ignition receives power again. There is only a 4% ratio difference between each of the 4 gearsets. Sounds like a dirtbike shifting. Waaaaaaa...waaaaaaaaaa...waaaaaaaaa...waaaaaaaaaaa aaaaaaaaa.
Merc Six drives have the skegs cut off and are trimmable, but locked straight. Toe is hydraulically adjustable +/- a few degrees underway.
Boat fired up for the first time ever on Thursday before the Shootout. Boat ran well Saturday for first shot out of the box.
Boat is probably a little heavier than the Mystic.
Motors are Merc 1200's. Nothing is visibly altered. Possibly some internal magic, but they are running what appear to be "normal" pulley sizes.
Transmissions are very trick and compact air-shifted 4 speed units. Real gears and dogs - no clutches or sissy stuff. Throttles must be wide open in order for upshifting to be enabled. Shifts are allowed via an ignition interrupter that unloads the transmissions, the dog rapidly shifts out of one gear, sensors count pulses until the dog and mating gear are in correct position, and the dog is slammed home into the next gearset as the ignition receives power again. There is only a 4% ratio difference between each of the 4 gearsets. Sounds like a dirtbike shifting. Waaaaaaa...waaaaaaaaaa...waaaaaaaaa...waaaaaaaaaaa aaaaaaaaa.
Merc Six drives have the skegs cut off and are trimmable, but locked straight. Toe is hydraulically adjustable +/- a few degrees underway.
Boat fired up for the first time ever on Thursday before the Shootout. Boat ran well Saturday for first shot out of the box.
Boat is probably a little heavier than the Mystic.
So what is the point of 4 very close ratio gears as compared to 2 or 3 more spaced out gears? Just easier to get from 1 to 4 if you have 2 and 3 in the middle? As compared to a big jump for (what would be) 1 to 4....? Less stress on everything taking more smaller jumps?
09-18-2008 | 08:09 AM
#37
Platinum Member
Joined: Sep 2001
Posts: 5,769
Likes: 150
From: tn
I didn't know the tranny was a secret.
It's not like you can't already HEAR the shifts..
These are "old news" in Europe.
As far as ratios, the trans builder says that the first gen units had a "low" first, and much wider ratios, but the racers kept asking for closer and closer gearing. If you baseline your prop pitch at 40", four selections, each a 4% change would give you the effect of having 4 props. 37", 38.4", 40", 41.6"
That's pretty significant.
I'm a huge fan of the transmissions. I think all boats should have them. With further development and a market for them, these babies would be perfect for pleasure boats, especially when you look at the possible fuel economy benefits. As was mentioned, though, I agree that wider ratios would likely be the norm for pleasure applications. That, and of course, a reverse.
mc
It's not like you can't already HEAR the shifts..
These are "old news" in Europe.
As far as ratios, the trans builder says that the first gen units had a "low" first, and much wider ratios, but the racers kept asking for closer and closer gearing. If you baseline your prop pitch at 40", four selections, each a 4% change would give you the effect of having 4 props. 37", 38.4", 40", 41.6"
That's pretty significant.
I'm a huge fan of the transmissions. I think all boats should have them. With further development and a market for them, these babies would be perfect for pleasure boats, especially when you look at the possible fuel economy benefits. As was mentioned, though, I agree that wider ratios would likely be the norm for pleasure applications. That, and of course, a reverse.
mc
09-18-2008 | 10:22 AM
#38
Registered
Joined: Sep 2004
Posts: 1,292
Likes: 0
From: Pickwick Lake, USA
I didn't know the tranny was a secret.
It's not like you can't already HEAR the shifts..
These are "old news" in Europe.
As far as ratios, the trans builder says that the first gen units had a "low" first, and much wider ratios, but the racers kept asking for closer and closer gearing. If you baseline your prop pitch at 40", four selections, each a 4% change would give you the effect of having 4 props. 37", 38.4", 40", 41.6"
That's pretty significant.
I'm a huge fan of the transmissions. I think all boats should have them. With further development and a market for them, these babies would be perfect for pleasure boats, especially when you look at the possible fuel economy benefits. As was mentioned, though, I agree that wider ratios would likely be the norm for pleasure applications. That, and of course, a reverse.
mc
It's not like you can't already HEAR the shifts..
These are "old news" in Europe.
As far as ratios, the trans builder says that the first gen units had a "low" first, and much wider ratios, but the racers kept asking for closer and closer gearing. If you baseline your prop pitch at 40", four selections, each a 4% change would give you the effect of having 4 props. 37", 38.4", 40", 41.6"
That's pretty significant.
I'm a huge fan of the transmissions. I think all boats should have them. With further development and a market for them, these babies would be perfect for pleasure boats, especially when you look at the possible fuel economy benefits. As was mentioned, though, I agree that wider ratios would likely be the norm for pleasure applications. That, and of course, a reverse.
mc
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