Longer tanks, source of bad trim - Page 2

jluttichau · January 11th, 2006, 02:28 AM

Quote: (Originally Posted by fraser)

This is AG presumably Jonas? I think he has a far more pronounced arch in his trim than most of us, so would be affected by the longer cylinders.

Yes AG, could be an explanation.

Cheers

graham_hk · January 11th, 2006, 09:08 AM

Here's a question to ponder - does one have to arch ones back to be flat in the water? You don't have to arch your back to stand up straight so why would it be necessary underwater? I was initially taught to arch (by an instructor brought through the ranks by AG) but I don't think it necessary in such a pronounced fashion and ultimately is uncomfortable. There are plenty of pictures out there showing divers almost bent in two giving them essentially the same streamlining as a badly trimmed knees down diver...

Graham

*JohnKendall* · January 11th, 2006, 10:28 AM

Quote: (Originally Posted by graham_hk)

Here's a question to ponder - does one have to arch ones back to be flat in the water? You don't have to arch your back to stand up straight so why would it be necessary underwater? I was initially taught to arch (by an instructor brought through the ranks by AG) but I don't think it necessary in such a pronounced fashion and ultimately is uncomfortable. There are plenty of pictures out there showing divers almost bent in two giving them essentially the same streamlining as a badly trimmed knees down diver...

Graham

I think there is some requirement to arch your back, in order to be able to look forward while remaining horizontal. However yes, you could over do it.

J

Little Pete · January 11th, 2006, 11:48 AM

I find I don't arch as much as I used to try to do and have much better trim now. I use the ECS cylinders as well but even though they're long (and I'm not :p ) my trim works very well with them.

I've been told the bands are too low (the upper one is maybe 1.5-2 inches below the shoulder) but that's a different issue and I'll work on that separately. I can reach the valves and my trim is good (I think

) so I just need to make small adjustments to get used to it.

Davey Willo · January 11th, 2006, 12:06 PM

Sorry to be the one who has to break it to you Pete, but you're actually using a pair of 3ltr pony cylinders, they just look like ECS 12's next to you..... :D

Little Pete · January 11th, 2006, 12:18 PM

You mean I forked out several hundred on micro tanks??

??

??

Tell me the truth Dave, I know you would.......are they really pony tanks or are they the mini inflation cylinders from Buddy BCs???

Anyway, see my profile for a pic of me in bob's 18s :D

graham_hk · January 11th, 2006, 01:24 PM

Quote: (Originally Posted by JohnKendall)

I think there is some requirement to arch your back, in order to be able to look forward while remaining horizontal. However yes, you could over do it.

J

But I can look directly up while standing and not arch my back...so I still not sure of the need to arch - I think it over comes some of the problems of balance but in theory it shouldn't be necessary to acheive that flat body position.

Graham

January 11th, 2006, 09:08 AM	#12 (permalink)
graham_hk(Offline) GUE instructor Join Date: Nov 2005 Location: here, there and everywhere Posts: 783	Here's a question to ponder - does one have to arch ones back to be flat in the water? You don't have to arch your back to stand up straight so why would it be necessary underwater? I was initially taught to arch (by an instructor brought through the ranks by AG) but I don't think it necessary in such a pronounced fashion and ultimately is uncomfortable. There are plenty of pictures out there showing divers almost bent in two giving them essentially the same streamlining as a badly trimmed knees down diver... Graham Last edited by graham_hk; January 11th, 2006 at 09:09 AM. Reason: crap spelling

January 11th, 2006, 02:28 AM	#11 (permalink)
jluttichau(Offline) Custom User Title Join Date: Nov 2005 Location: Denmark Posts: 437	Quote: (Originally Posted by fraser) This is AG presumably Jonas? I think he has a far more pronounced arch in his trim than most of us, so would be affected by the longer cylinders. Yes AG, could be an explanation. Cheers

January 11th, 2006, 10:28 AM	#13 (permalink)
JohnKendall(Offline) GUE Instructor/DIRX Moderator Join Date: Nov 2005 Location: Cambridge, UK Posts: 1,115	Quote: (Originally Posted by graham_hk) Here's a question to ponder - does one have to arch ones back to be flat in the water? You don't have to arch your back to stand up straight so why would it be necessary underwater? I was initially taught to arch (by an instructor brought through the ranks by AG) but I don't think it necessary in such a pronounced fashion and ultimately is uncomfortable. There are plenty of pictures out there showing divers almost bent in two giving them essentially the same streamlining as a badly trimmed knees down diver... Graham I think there is some requirement to arch your back, in order to be able to look forward while remaining horizontal. However yes, you could over do it. J

January 11th, 2006, 11:48 AM	#14 (permalink)
Little Pete(Offline) New Member Join Date: Nov 2005 Location: UK Posts: 509	I find I don't arch as much as I used to try to do and have much better trim now. I use the ECS cylinders as well but even though they're long (and I'm not :p ) my trim works very well with them. I've been told the bands are too low (the upper one is maybe 1.5-2 inches below the shoulder) but that's a different issue and I'll work on that separately. I can reach the valves and my trim is good (I think ) so I just need to make small adjustments to get used to it.

January 11th, 2006, 12:06 PM	#15 (permalink)
Davey Willo(Offline) New Member Join Date: Nov 2005 Location: Cleveland Posts: 197	Sorry to be the one who has to break it to you Pete, but you're actually using a pair of 3ltr pony cylinders, they just look like ECS 12's next to you..... :D

January 11th, 2006, 12:18 PM	#16 (permalink)
Little Pete(Offline) New Member Join Date: Nov 2005 Location: UK Posts: 509	You mean I forked out several hundred on micro tanks?? ?? ?? Tell me the truth Dave, I know you would.......are they really pony tanks or are they the mini inflation cylinders from Buddy BCs??? Anyway, see my profile for a pic of me in bob's 18s :D

January 11th, 2006, 01:24 PM	#17 (permalink)
graham_hk(Offline) GUE instructor Join Date: Nov 2005 Location: here, there and everywhere Posts: 783	Quote: (Originally Posted by JohnKendall) I think there is some requirement to arch your back, in order to be able to look forward while remaining horizontal. However yes, you could over do it. J But I can look directly up while standing and not arch my back...so I still not sure of the need to arch - I think it over comes some of the problems of balance but in theory it shouldn't be necessary to acheive that flat body position. Graham