Empathy List Archives

MM

Mike Maurice

Sat, Jan 15, 2005 5:22 AM

I have been sslurking on the trawler forum and now I remember why so many
people have twin engines. They are using velvet drives. If I had a velvet
drive, I would have twins or I would have nightmares. Come to think of it I
have nightmares about those drives, even when I don't have any.

Those drives are just fine for coastal work, if you don't mind having them
wearing out. They are lightweight drives and it is a big mistake to think
they are something to be taking way offshore. The only use I would have for
them might be for an engine of less than 80 hp. Otherwise, I would not want
them around for any kind of open passage.

I have had one on the only engine on the boat, 1000 miles offshore, and I
was NOT a happy camper. I would have preferred a Twin Disc 509 gear which
is built for continuous, heavy duty use, at least for the size engines it
is intended for.

Mike

Capt. Mike Maurice
Tualatin(Portland), Oregon

I have been sslurking on the trawler forum and now I remember why so many people have twin engines. They are using velvet drives. If I had a velvet drive, I would have twins or I would have nightmares. Come to think of it I have nightmares about those drives, even when I don't have any. Those drives are just fine for coastal work, if you don't mind having them wearing out. They are lightweight drives and it is a big mistake to think they are something to be taking way offshore. The only use I would have for them might be for an engine of less than 80 hp. Otherwise, I would not want them around for any kind of open passage. I have had one on the only engine on the boat, 1000 miles offshore, and I was NOT a happy camper. I would have preferred a Twin Disc 509 gear which is built for continuous, heavy duty use, at least for the size engines it is intended for. Mike Capt. Mike Maurice Tualatin(Portland), Oregon

CS

Chuck Shipley

Mon, Jan 17, 2005 8:49 PM

I guess after the July/August 2003 issue of Passagemaker, it is clear
that the CR2 Borg-Warner transmissions are real dogs, but whereas Bob
Smith seems to be saying that the non-CR2 velvet drives are fine, Mike
paints his scorn w/ a much broader brush.

So the question becomes: Mike, are your nightmares inspired by the
notorious CR2s
or do all velvet drives give you bad dreams? :-)

--chuck
Tusen Takk (w/ a non-CR2 velvet drive)
KK42-152

On Fri, 14 Jan 2005 21:22:48 -0800, Mike Maurice
mikem@yachtsdelivered.com wrote:

I have been sslurking on the trawler forum and now I remember why so many
people have twin engines. They are using velvet drives. If I had a velvet
drive, I would have twins or I would have nightmares. Come to think of it I
have nightmares about those drives, even when I don't have any.

Those drives are just fine for coastal work, if you don't mind having them
wearing out. They are lightweight drives and it is a big mistake to think
they are something to be taking way offshore. The only use I would have for
them might be for an engine of less than 80 hp. Otherwise, I would not want
them around for any kind of open passage.

<snip>

Capt. Mike Maurice

I guess after the July/August 2003 issue of Passagemaker, it is clear that the CR2 Borg-Warner transmissions are real dogs, but whereas Bob Smith seems to be saying that the non-CR2 velvet drives are fine, Mike paints his scorn w/ a much broader brush. So the question becomes: Mike, are your nightmares inspired by the notorious CR2s or do all velvet drives give you bad dreams? :-) --chuck Tusen Takk (w/ a non-CR2 velvet drive) KK42-152 On Fri, 14 Jan 2005 21:22:48 -0800, Mike Maurice <mikem@yachtsdelivered.com> wrote: > I have been sslurking on the trawler forum and now I remember why so many > people have twin engines. They are using velvet drives. If I had a velvet > drive, I would have twins or I would have nightmares. Come to think of it I > have nightmares about those drives, even when I don't have any. > > Those drives are just fine for coastal work, if you don't mind having them > wearing out. They are lightweight drives and it is a big mistake to think > they are something to be taking way offshore. The only use I would have for > them might be for an engine of less than 80 hp. Otherwise, I would not want > them around for any kind of open passage. > <snip> > Capt. Mike Maurice

MM

Mike Maurice

Mon, Jan 17, 2005 9:25 PM

At 03:49 PM 1/17/05 -0500, you wrote:

So the question becomes: Mike, are your nightmares inspired by the
notorious CR2s
or do all velvet drives give you bad dreams? :-)

It is hard to separate the various versions. The transmissions that have
caused trouble were those used on the Lehman 6 cylinder diesels. 120-275
hp. I have to admit that I can't tell you precisely what model or variation
was used and which ones were the culprits. But, as far as I can tell the
VD's were orginally used on gas engines and looking over the specs for the
new 71 and 72 series they appear to be pretty similar. I would be leery of
any of them, but that may not be justified. The spec sheets indicate about
80-100 hp for heavy duty use at about 2000 rpm, 200 ft pounds of torque.
The light duty version up to 390 ft.lbs. Using them for any harder use
would not seem to be a good idea.

I would still prefer a Twin Disc.

Mike

Capt. Mike Maurice
Tualatin(Portland), Oregon

At 03:49 PM 1/17/05 -0500, you wrote: >So the question becomes: Mike, are your nightmares inspired by the >notorious CR2s >or do all velvet drives give you bad dreams? :-) It is hard to separate the various versions. The transmissions that have caused trouble were those used on the Lehman 6 cylinder diesels. 120-275 hp. I have to admit that I can't tell you precisely what model or variation was used and which ones were the culprits. But, as far as I can tell the VD's were orginally used on gas engines and looking over the specs for the new 71 and 72 series they appear to be pretty similar. I would be leery of any of them, but that may not be justified. The spec sheets indicate about 80-100 hp for heavy duty use at about 2000 rpm, 200 ft pounds of torque. The light duty version up to 390 ft.lbs. Using them for any harder use would not seem to be a good idea. I would still prefer a Twin Disc. Mike Capt. Mike Maurice Tualatin(Portland), Oregon

passagemaking@lists.trawlering.com

Twins