Bob Dunsire Bagpipe Forums

Bob Dunsire Bagpipe Forums (http://forums.bobdunsire.com/forums/index.php)
-   Beginners, Intermediate, + (http://forums.bobdunsire.com/forums/forumdisplay.php?f=346)
-   -   Testing air tightness of bag (http://forums.bobdunsire.com/forums/showthread.php?t=169573)

Lucky Phil 03-27-2020 05:55 PM

Testing air tightness of bag
 
Hi,

Plugged up the stocks with corrk, same as chanter, blown bag up to test it leaks (Something is, I think). Know how long should the bag last before starting to deflate.


Thanks

Pip01 03-27-2020 08:03 PM

Re: Testing air tightness of bag
 




Lucky Phil,

First question... what material?

Nonetheless... have a bit of mild soapy water
handy... to put on possible spots... as small
leaks... can be the Devil's Own... to spot. :)

What I have always done... to save time... is
to hold it up near my ear... and squeeze it
ever so gently... to see if I could hear any
air coming out.

All in all... if it's airtight... should be a good
half-hour or so... before you notice any lack
of rigidity in the bag.

Good Luck!!

Regards,

Pip01



Lucky Phil 03-27-2020 11:10 PM

Re: Testing air tightness of bag
 
Thanks Pip01,

Bags a black Bannantyne hybrid. Seems to be pretty old. After about 5 minutes it was obvious that there was a leak somewhere. Turned out to be the zipper.

Thanks for your advice.

el gaitero 03-28-2020 06:42 AM

Re: Testing air tightness of bag
 
Quote:

Originally Posted by Lucky Phil (Post 1344360)
Thanks Pip01,

Bags a black Bannantyne hybrid. Seems to be pretty old. After about 5 minutes it was obvious that there was a leak somewhere. Turned out to be the zipper.

Thanks for your advice.

Yes..the black bag is quite an oldie....they changed to a light tan color 6-7 years ago. My black one also had the zipper fail ..at the docking end...just a few days before a few upcoming gigs. I sealed it up with silicone caulk and duct tape. Then installed a new tan one ...very nice for a few years until the taped seam leaked.
I replaced it with a Canmore hybrid 3-1/2 years ago....still golden and as tight as a snare head + superior moisture control IMHO. ( simple vinyl tube trap + Trap-Dri)

magsevenband 03-30-2020 06:25 AM

Re: Testing air tightness of bag
 
Ditto on the black Bannatyne leaking at the zipper..this was several years ago...the darn thing was never tight...onto the Canmore Hybrid since then and no leaks...plays like the old L&M's but with better moisture control.

CalumII 03-30-2020 06:42 AM

Re: Testing air tightness of bag
 
Quote:

Originally Posted by Lucky Phil (Post 1344358)
how long should the bag last before starting to deflate.


There isn't one right answer to this, but in general if you fully inflate it, and can't force in any more air after thirty seconds, you can't get much better.



To me, if it still feels tight as a drum after thirty seconds, I'm happy. Synthetic bags always lose some air, and it's rarely fixable. If it's noticeably slack, then it will be noticeable when playing. If you're fit and not playing at your limits it may be manageable, but it's time to think about a replacement.

el gaitero 03-30-2020 06:48 AM

Re: Testing air tightness of bag
 
Quote:

Originally Posted by CalumII (Post 1344408)
There isn't one right answer to this, but in general if you fully inflate it, and can't force in any more air after thirty seconds, you can't get much better.



To me, if it still feels tight as a drum after thirty seconds, I'm happy. Synthetic bags always lose some air, and it's rarely fixable. If it's noticeably slack, then it will be noticeable when playing. If you're fit and not playing at your limits it may be manageable, but it's time to think about a replacement.

I’d readily agree 30 seconds is quite adequate....albeit there’s that recent demo video of Bruce Hitchings displaying the superb air efficiency of his Balance Tone drone reeds....the vid wherein a hard blown up syn bag with only the chanter stock corked remains drum tight laying on a countertop for ...???.. apparently well beyond 10 minutes before the drones finally start to sound from lowered air pressure.

CalumII 03-30-2020 11:14 AM

Re: Testing air tightness of bag
 
Yes, I've had bags that could remain tight overnight, but tbh I suspect videos like Bruce's are as much marketing as they are practical piping.

el gaitero 03-30-2020 12:00 PM

Re: Testing air tightness of bag
 
Quote:

Originally Posted by calumii (Post 1344421)


are as much marketing as they are practical piping.

reallly..? 😂


All times are GMT -7. The time now is 07:44 PM.