I use a liquid polyurethane called “Stormsure” sold by Clarke Rubber for small repairs. It has been very successful on all occasions. Tim
Sent from my iPad > On 5 Nov 2018, at 2:46 pm, Jim Crowhurst <[email protected]> wrote: > > Hi Everyone, > I want to make a small repair to a pin-hole leak in one of my clipper > plastics ballast bags. Unfortunately they no longer make ballast bags for > gliders, citing problems with insurance. Strangely they weren't able to help > me with the glue and material required to repair their particular bag > (lightweight fluoro orange). Has anyone successfully repaired a leak from one > of these bags, if so what did you use. Also, are there any Brisbane based > firms able make new bags - they need to be able to weld seams on bladder > bags? I'm waiting to hear back from turtle-pack. Anyone else make ballast > bags? > > Thanks > > Jim > >> On Mon, Aug 28, 2017 at 10:38 PM Noel Roediger <[email protected]> >> wrote: >> The best ballast bags I ever used were made by Clipper Plastics – a >> Melbourne based company. >> >> >> >> They had patterns for all sailplanes requiring such and the bags were >> reasonably priced. >> >> >> >> Noel. >> >> >> >> From: Bruce Taylor [mailto:[email protected]] >> Sent: Monday, August 28, 2017 3:32 PM >> To: 'Justin Sinclair'; 'Gary Stevenson' >> Cc: 'Discussion of issues relating to Soaring in Australia.'; 'Anthony >> Smith'; 'Gliding Australia Forum' >> Subject: RE: [gfaforum] RE: water bags and tanks >> >> >> >> Hi Gary and all, >> >> >> >> In regard to sourcing ballast bags, there is a company at Currumbin in Qld >> called Turtle Pac who make all kinds of water and fuel bags for aviation and >> marine use. You will find them at http://www.turtlepac.com/ >> >> >> >> I have used them in the past, as have a number of other gliding people, and >> they appear to provide a good quality product and are very pleasant and easy >> to deal with. >> >> >> >> Speaking of “Super ships” and matters of weight and balance, it is my >> experience that as weights and wing-loadings inevitably increase, then the >> chance of getting the loading wrong enough to matter also increases. The JS1 >> is a beautiful glider to own and fly, but it is the first glider that I have >> been involved with that has a real potential to be loaded well outside of >> its C of G limitations. Particularly in 21m span, the large wing ballast >> load, two separate tail tanks, jet fuel load and of course various pilot >> weights require that you do actually sit down with the supplied loading >> spreadsheet and put all the correct numbers into the calculation. >> Wing-loadings close to 60kg/sq m are a real hoot to fly with, but need to be >> treated with much respect. >> >> >> >> On the upside, the EASA-specified certification flight testing is now >> incredibly rigorous, so you can be assured that if you do get the numbers >> wrong, or have a ballast-dump malfunction, the glider will be doing its best >> to keep you alive. Things have changed since gliders like the Cirrus were >> certified! Spinning the JS1C/21m with a fully asymmetric ballast load, with >> the C of G WAY behind the aft limit, makes for particularly exciting >> viewing! It’s on Youtube somewhere. >> >> >> >> Cheers, BT. >> >> >> >> From: Justin Sinclair [mailto:[email protected]] >> Sent: Monday, August 28, 2017 7:38 AM >> To: Gary Stevenson >> Cc: Discussion of issues relating to Soaring in Australia.; Anthony Smith; >> Gliding Australia Forum >> Subject: Re: [gfaforum] RE: water bags and tanks >> >> >> >> My only comment having been involved as CFI of a club that has had an >> asymmetric balance accident would be that "if" you can pick that you have >> asymmetry make sure do a fast landing. >> >> >> >> I am not sure of the speed or flap setting but logic would dictate something >> above your normal fully ballasted/slow thermalling speed. The idea would be >> to lower the wing onto the ground before you lose aileron effectiveness, but >> do not do the traditional stall it on landing otherwise you get a big >> surprise as the heavy wing drops first. >> >> >> >> The issue with asymmetry should be structural not aerodynamic. Even if one >> wing has 200lts of water in it you average wing can easily develop enough >> angle of attack to pull 3G or 600lts/kg, so as long as you have speed/AoA >> you will be fine. >> >> >> >> My only other advice would be if you use tape to cover the vent holes >> instead of wing sticks make sure you do a proper ABCD walk around just >> before you jump in the seat and use any colour tape other than white. >> >> >> >> Justin >> >> >> >> Justin Sinclair >> >> 17 Queen St >> >> Scarborough Qld >> >> >> >> 0421061811 >> >> >> On 28 Aug 2017, at 12:18 am, Gary Stevenson <[email protected]> wrote: >> >> Hi Noel, >> >> Tend to agree with you here. >> >> >> >> Re “twisted” I am sure that this does not apply only to the bags. Think >> about some of the pilots you know! >> >> >> >> You say “Generally a sailplane will not display an imbalance until stalled. >> One wing doesn’t know it’s heavier than its partner until then.” A very >> interesting point, which I have had the misfortune to inadvertently explore >> a little bit, but – thank God – never seriously in the air. >> >> >> >> Without doubt the use of water ballast introduced a whole new dimension to >> gliding, as, just co-incidentally Mike B mentioned in a concurrent post. >> However it use is something that should never be treated lightly [groan]. A >> couple of hundred litres of ballast will turn your pussy cat into a tiger: >> In the glide; into a missile ..... almost. Take care that you are not >> lined up on one of your mates. >> >> >> >> You say “A number of prototype sailplanes have been lost while testing their >> ability to remain controllable at the stall with max. Imbalance” I have >> never had the chance to own/fly a current “super-ship”, but from the >> literature , they have (as a minimum), inboard tanks, outboard tanks, and >> fuselage tanks. It would seem to me that the situation could become somewhat >> fraught, if the slightest thing goes wrong with the dumping arrangement. >> >> >> >> Would any knowable person like to make comment here? >> >> >> >> Finally we come to the important practical question of “good ballast bags”. >> It would seem that these are becoming hard to source, due to potential >> liability issues. Who in Australia, or elsewhere, are making new >> replacement bags? >> >> >> >> Regards, >> >> Gary >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> From: Aus-soaring [mailto:[email protected]] On Behalf >> Of Noel Roediger >> Sent: Sunday, 27 August 2017 10:18 PM >> To: 'Anthony Smith'; 'Discussion of issues relating to Soaring in >> Australia.'; 'Gliding Australia Forum' >> Subject: Re: [Aus-soaring] [gfaforum] RE: American Soaring Symposia >> >> >> >> Thanks Anthony. >> >> >> >> The final question asked of Wil re assymetric water ballast merits further >> comment particularly for those who fly sailplanes with bags instead of tanks. >> >> >> >> I believe good ballast bags far outweigh the problems exhibited by rigid >> tanks which often leak into the surrounding structure. >> >> >> >> Having said that I don’t know of any “bagged” tank that is not extended and >> held in place by a rear cord. >> >> >> >> In reality bags should be held by two cords. One at its rear as is the norm >> but also one at its front to eliminate the possibility of its leading edge >> falling over the aft edge and becoming twisted. >> >> >> >> >> >> >> >> Regards >> >> >> >> Noel. >> >> >> >> From: Anthony Smith [mailto:[email protected]] >> Sent: Sunday, August 27, 2017 6:32 PM >> To: 'Discussion of issues relating to Soaring in Australia.'; 'Gliding >> Australia Forum' >> Subject: [gfaforum] RE: [Aus-soaring] American Soaring Symposia >> >> >> >> Part of the Wil Schumann paper is here: >> >> >> >> http://www.betsybyars.com/guy/soaring_symposia/72-modif.html >> >> >> >> From: Aus-soaring [mailto:[email protected]] On Behalf >> Of Ron Sanders >> Sent: Sunday, 27 August 2017 6:22 PM >> To: Gliding Australia Forum <[email protected]>; Discussion of >> issues relating to Soaring in Australia. <[email protected]> >> Subject: [Aus-soaring] American Soaring Symposia >> >> >> >> Any body got any idea where is can get any of these publications from the >> seventies?? >> >> Wil Schumann did a clean up of a libelle that i would like to read about >> again. >> >> >> >> Ron >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Gliding Australia Forum" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at >> https://groups.google.com/a/glidingaustralia.org/group/gfaforum/. >> >> >> >> >> >> Virus-free. www.avg.com >> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Gliding Australia Forum" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at >> https://groups.google.com/a/glidingaustralia.org/group/gfaforum/. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Gliding Australia Forum" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at >> https://groups.google.com/a/glidingaustralia.org/group/gfaforum/. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Gliding Australia Forum" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at >> https://groups.google.com/a/glidingaustralia.org/group/gfaforum/. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Gliding Australia Forum" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at >> https://groups.google.com/a/glidingaustralia.org/group/gfaforum/. > > -- > You received this message because you are subscribed to the Google Groups > "Gliding Australia Forum" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at > https://groups.google.com/a/glidingaustralia.org/group/gfaforum/.
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