KR>Isn't that PCB idea great?
Netters, What I really like about the KRNet is the incredible amount of creativity that we manage to pool together. I think that PCB idea is a perfect example. Indeed, it is fiberglass, of the best kind (multiple laminations). And I think it is the first time somebody tries to use it as an aircraft material, but surely, it can't be worse than our usual home-made, first-time builder fiberglass! Now, if somebody with a good knowledge of material properties could study typical PCB sheets to compare its properties with plywood and fiberglass, I think it would not be wasted effort. How much does PCB sheet cost, by the way? Serge Vidal KR2 ZS-WEC Johannesburg, South Africa
KR>Isn't that PCB idea great?
Thanks Serge, you understand me right. That is, now I am waiting more opinion on this issue. I do not know how much it cost some where, but for me here it is not expensive (~4$ for 1kg), though I can't find aircraft grade plywood at all. Again, I want to use it just for the spars, so, the weight penalty is not so important due of small quantity. But I guess it could be used for boat as well. BR, Alex Birca Moldova -Original Message- From: Serge F. Vidal [mailto:serge.vi...@ate-international.com] Sent: Wednesday, August 20, 2003 12:16 PM To: 'KR builders and pilots' Subject: KR>Isn't that PCB idea great? Netters, What I really like about the KRNet is the incredible amount of creativity that we manage to pool together. I think that PCB idea is a perfect example. Indeed, it is fiberglass, of the best kind (multiple laminations). And I think it is the first time somebody tries to use it as an aircraft material, but surely, it can't be worse than our usual home-made, first-time builder fiberglass! Now, if somebody with a good knowledge of material properties could study typical PCB sheets to compare its properties with plywood and fiberglass, I think it would not be wasted effort. How much does PCB sheet cost, by the way? Serge Vidal KR2 ZS-WEC Johannesburg, South Africa ___ see KRnet list details at http://www.krnet.org/instructions.html
KR>Isn't that PCB idea great?
Where in the world is Moldova? - Original Message - From: "Alexander Birca (MD/RMD)" <alexander.bi...@ericsson.com> To: <serge.vi...@ate-international.com>; "'KR builders and pilots'" <kr...@mylist.net> Sent: Wednesday, August 20, 2003 5:39 AM Subject: RE: KR>Isn't that PCB idea great? > Thanks Serge, you understand me right. > That is, now I am waiting more opinion on this issue. > I do not know how much it cost some where, but for me here it is not expensive (~4$ for 1kg), though I can't > find aircraft grade plywood at all. Again, I want to use it just for the spars, so, the weight penalty > is not so important due of small quantity. But I guess it could be used for boat as well. > > BR, > Alex Birca > Moldova > -Original Message- > From: Serge F. Vidal [mailto:serge.vi...@ate-international.com] > Sent: Wednesday, August 20, 2003 12:16 PM > To: 'KR builders and pilots' > Subject: KR>Isn't that PCB idea great? > > > Netters, > > What I really like about the KRNet is the incredible amount of creativity > that we manage to pool together. > > I think that PCB idea is a perfect example. Indeed, it is fiberglass, of the > best kind (multiple laminations). And I think it is the first time somebody > tries to use it as an aircraft material, but surely, it can't be worse than > our usual home-made, first-time builder fiberglass! > > Now, if somebody with a good knowledge of material properties could study > typical PCB sheets to compare its properties with plywood and fiberglass, I > think it would not be wasted effort. > > How much does PCB sheet cost, by the way? > > Serge Vidal > KR2 ZS-WEC > Johannesburg, South Africa > > > ___ > see KRnet list details at http://www.krnet.org/instructions.html > > ___ > see KRnet list details at http://www.krnet.org/instructions.html >
KR>Isn't that PCB idea great?
Robert, you will not believe, but it is a real country :-) Just that it is a ve-e-ery small. A exUSSR republic, have a look on the map, between Romanian and Ukraine. Do not ask where is Romania and Ukraine :-) BR, Alex Birca Moldova -Original Message- From: Robert Stone [mailto:rsto...@hot.rr.com] Sent: Wednesday, August 20, 2003 2:50 PM To: KR builders and pilots Subject: Re: KR>Isn't that PCB idea great? Where in the world is Moldova?
KR>Isn't that PCB idea great?
I would think the PBC would have the same strength or better than the plywood but I would want to know what kind of resin was used in the manafacture of the PBC. If it's made from a vinal ester product, then that's what I would use to glue it to the wood. If it's made from an epoxy resin I would use an epoxy resin glue. It's not a question of the type of glue used for the wood, it has to do with the bonding properties between the glue and the PBC. Mike Turner - Original Message - From: Alexander Birca (MD/RMD) To: 'Robert Stone' ; 'KR builders and pilots' Sent: Wednesday, August 20, 2003 6:57 AM Subject: RE: KR>Isn't that PCB idea great? Robert, you will not believe, but it is a real country :-) Just that it is a ve-e-ery small. A exUSSR republic, have a look on the map, between Romanian and Ukraine. Do not ask where is Romania and Ukraine :-) BR, Alex Birca Moldova -Original Message- From: Robert Stone [mailto:rsto...@hot.rr.com] Sent: Wednesday, August 20, 2003 2:50 PM To: KR builders and pilots Subject: Re: KR>Isn't that PCB idea great? Where in the world is Moldova? ___ see KRnet list details at http://www.krnet.org/instructions.html
KR>Isn't that PCB idea great?
Usually is used two type of resin, epoxy or phenolic. In my case it is epoxy. For PCB production is used only epoxy. BR, Alex Birca Moldova -Original Message- From: Mike Turner [mailto:aviato...@msn.com] Sent: Wednesday, August 20, 2003 6:31 PM To: KR builders and pilots; 'Robert Stone' Subject: Re: KR>Isn't that PCB idea great? I would think the PBC would have the same strength or better than the plywood but I would want to know what kind of resin was used in the manafacture of the PBC. If it's made from a vinal ester product, then that's what I would use to glue it to the wood. If it's made from an epoxy resin I would use an epoxy resin glue. It's not a question of the type of glue used for the wood, it has to do with the bonding properties between the glue and the PBC. Mike Turner - Original Message - From: Alexander Birca (MD/RMD) To: 'Robert Stone' ; 'KR builders and pilots' Sent: Wednesday, August 20, 2003 6:57 AM Subject: RE: KR>Isn't that PCB idea great? Robert, you will not believe, but it is a real country :-) Just that it is a ve-e-ery small. A exUSSR republic, have a look on the map, between Romanian and Ukraine. Do not ask where is Romania and Ukraine :-) BR, Alex Birca Moldova -Original Message- From: Robert Stone [mailto:rsto...@hot.rr.com] Sent: Wednesday, August 20, 2003 2:50 PM To: KR builders and pilots Subject: Re: KR>Isn't that PCB idea great? Where in the world is Moldova? ___ see KRnet list details at http://www.krnet.org/instructions.html ___ see KRnet list details at http://www.krnet.org/instructions.html
KR>Isn't that PCB idea great?
Those are good points. I've spent a few years repairing circuit boards made of this material and my BIG concern is how brittle the material is. Compared to the AC plywood I've used in the past PCB material just doesn't have the "give" that plywood has. In addition it seems to be heavy by comparison, but I haven't actually weighed it to see. I also agree with an earlier post the material does seem to contain more epoxy than glass. I would worry about bonding as mentioned and the structural brittleness that I've noticed while working with the material. I would certainly build some test panels and stress them pretty hard before committing to using PCB material in my plane. If anyone tests this stuff please let us know what your results were. Dennis ... Mike Turner <aviato...@msn.com> wrote: I would think the PBC would have the same strength or better than the plywood but I would want to know what kind of resin was used in the manafacture of the PBC. If it's made from a vinal ester product, then that's what I would use to glue it to the wood. If it's made from an epoxy resin I would use an epoxy resin glue. It's not a question of the type of glue used for the wood, it has to do with the bonding properties between the glue and the PBC. Mike Turner - Original Message - From: Alexander Birca (MD/RMD) To: 'Robert Stone' ; 'KR builders and pilots' Sent: Wednesday, August 20, 2003 6:57 AM Subject: RE: KR>Isn't that PCB idea great? Robert, you will not believe, but it is a real country :-) Just that it is a ve-e-ery small. A exUSSR republic, have a look on the map, between Romanian and Ukraine. Do not ask where is Romania and Ukraine :-) BR, Alex Birca Moldova -Original Message- From: Robert Stone [mailto:rsto...@hot.rr.com] Sent: Wednesday, August 20, 2003 2:50 PM To: KR builders and pilots Subject: Re: KR>Isn't that PCB idea great? Where in the world is Moldova? ___ see KRnet list details at http://www.krnet.org/instructions.html ___ see KRnet list details at http://www.krnet.org/instructions.html - Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software
