KR> Canopy frame
I need to make a canopy frame, what I am intending to do is mount the canopy, make a frame from foam and fit while the canopy is in place, and glass over with carbon fibre cloth. Bi directional Carbon cloth is about $60 -$70 per metre, so I was going to use some unidirectional cloth for about $12 per metre and alternate the weave at 90 degrees to each other, Any problems or flaws in using the cloth in this way? any better methods? Chris Johnston North Richmond NSW Australia -- This message has been scanned for viruses and dangerous content by Ozdocs MailScanner, and is believed to be clean.
KR> Canopy frame
Just remember that radio waves do not travel through carbon fiber. Regular cloth works very well for that purpose and costs 5 times less and you only have to use one layer. From: "Chris Johnston" List-Post: krnet@list.krnet.org Date: 2007/01/25 Thu PM 03:36:29 CST To: "KRnet" Subject: KR> Canopy frame I need to make a canopy frame, what I am intending to do is mount the canopy, make a frame from foam and fit while the canopy is in place, and glass over with carbon fibre cloth. Bi directional Carbon cloth is about $60 -$70 per metre, so I was going to use some unidirectional cloth for about $12 per metre and alternate the weave at 90 degrees to each other, Any problems or flaws in using the cloth in this way? any better methods? Chris Johnston North Richmond NSW Australia -- This message has been scanned for viruses and dangerous content by Ozdocs MailScanner, and is believed to be clean. ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Canopy frame
Chris, if you decide to use the carbon, laying multiple layers at 90 degrees to one another is fine. If you were laying up this way over a wing for example, it would be stronger than using bidirectional cloth. When fibers are woven in and out to form bidirectional cloth, the fibers are actually not as strong because they are not in straight lines. They end up with tiny kinks, up and down as the weaving process leaves them. Unidirectional fibres are the strongest. Larry H. From: Chris Johnston chr...@ozdocs.net.au I need to make a canopy frame, what I am intending to do is mount the canopy, make a frame from foam and fit while the canopy is in place, and glass over with carbon fibre cloth. Bi directional Carbon cloth is about $60 -$70 per metre, so I was going to use some unidirectional cloth for about $12 per metre and alternate the weave at 90 degrees to each other, Any problems or flaws in using the cloth in this way? any better methods? Chris Johnston North Richmond NSW Australia
KR> Canopy frame
> Just remember that radio waves do not travel through carbon fiber. Regular cloth works very well for that purpose and costs 5 times less and you only have to use one layer I don/t think the canopy frame would provide enough area to mask to any great significane any RF, if it were a wing panel or whole tail section then I would assume that would be large enough to present problems. The materials engineers at work tell me that the great advantage of cf is its light weight, I always was of the opinion its primary advantage structurally was a very good youngs modulus, ie its siffness, my theory being that two layers of cf at half the weight of the regular stuff would give a stiffer canopy frame than the usual glass. Just a thought though. Chris Johnston > > North Richmond > > NSW Australia - Original Message - From: To: "KRnet" Sent: Friday, January 26, 2007 8:49 AM Subject: Re: KR> Canopy frame > Just remember that radio waves do not travel through carbon fiber. > Regular cloth works very well for that purpose and costs 5 times less and > you only have to use one layer. > > From: "Chris Johnston" > Date: 2007/01/25 Thu PM 03:36:29 CST > To: "KRnet" > Subject: KR> Canopy frame > >I need to make a canopy frame, what I am intending to do is mount the > canopy, make a frame from foam and fit while the canopy is in place, and > glass over with carbon fibre cloth. Bi directional Carbon cloth is about > $60 -$70 per metre, so I was going to use some unidirectional cloth for > about $12 per metre and alternate the weave at 90 degrees to each other, > Any problems or flaws in using the cloth in this way? any better methods? > > > > Chris Johnston > > North Richmond > > NSW Australia > -- > This message has been scanned for viruses and > dangerous content by Ozdocs MailScanner, and is > believed to be clean. > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > -- > This message has been scanned for viruses and > dangerous content by Ozdocs MailScanner, and is > believed to be clean. > > -- This message has been scanned for viruses and dangerous content by Ozdocs MailScanner, and is believed to be clean.
KR> Canopy frame
Chris Johnston wrote:> Just remember that radio waves do not travel through carbon fiber. Regular cloth works very well for that purpose and costs 5 times less and you only have to use one layer I don/t think the canopy frame would provide enough area to mask to any great significane any RF, if it were a wing panel or whole tail section then I would assume that would be large enough to present problems. The materials engineers at work tell me that the great advantage of cf is its light weight, I always was of the opinion its primary advantage structurally was a very good youngs modulus, ie its siffness, my theory being that two layers of cf at half the weight of the regular stuff would give a stiffer canopy frame than the usual glass. Just a thought though. Chris Johnston > > North Richmond > > NSW Australia - Original Message - From: To: "KRnet" Sent: Friday, January 26, 2007 8:49 AM Subject: Re: KR> Canopy frame > Just remember that radio waves do not travel through carbon fiber. > Regular cloth works very well for that purpose and costs 5 times less and > you only have to use one layer. > > From: "Chris Johnston" > Date: 2007/01/25 Thu PM 03:36:29 CST > To: "KRnet" > Subject: KR> Canopy frame > > I need to make a canopy frame, what I am intending to do is mount the > canopy, make a frame from foam and fit while the canopy is in place, and > glass over with carbon fibre cloth. Bi directional Carbon cloth is about > $60 -$70 per metre, so I was going to use some unidirectional cloth for > about $12 per metre and alternate the weave at 90 degrees to each other, > Any problems or flaws in using the cloth in this way? any better methods? > > People that say this crack me up! Do radio waves go through aluminum? - Bored stiff? Loosen up... Download and play hundreds of games for free on Yahoo! Games.
KR> Canopy frame
, I always was of the opinion its primary advantage > structurally was a > very good youngs modulus, ie its siffness, my theory being that two > layers > of cf at half the weight of the regular stuff would give a stiffer > canopy > frame than the usual glass. Just a thought though. > > > > Subject: KR> Canopy frame > > > > I need to make a canopy frame, what I am intending to do is mount > the > > canopy, make a frame from foam and fit while the canopy is in > place, and > > glass over with carbon fibre cloth. Bi directional Carbon cloth is > about > > $60 -$70 per metre, so I was going to use some unidirectional > cloth for > > about $12 per metre and alternate the weave at 90 degrees to each > other, > > Any problems or flaws in using the cloth in this way? any better > methods? > > > > Just a thought here but I think that you guys are thinking that carbon fiber is way more self supporting than it actually is. The canopy frame by itself well surely be very close to a wet noodle. It is not until you add a corner or some other sort of shape to the lay up that you will see the value of the carbon fiber lay up. 2 layers is not a structure, add a honeycomb between then it well be something. I made the cowl out of 2 layers of carbon fiber and had to some judicial reinforcing to stiffen it up. It still only weighs about 7# with paint Joe Horton, Coopersburg, Pa. joe.kr2s.buil...@juno.com
KR> Canopy Frame
Hi I am planning on doing my canopy frame and hinges in a similar way to Mark L . I noticed he attached the frame to the plexiglass with epoxy. What type is best and should I rough the plexiglass up to get it to stick? Because of all the problems we have encountered with using a Jabiru 3300 engine, mainly down to weight and balance but also resistance from the LAA due to the power of the engine and a lack of data to support our case. We are probably going to go down the Jabiru 2200 route which is what was in mind when various mods had been done to the airframe in the first place! (before I had the project) The main consideration being weight, as it is about the lightest engine of its size around. I have in my garage a brand new Jabiru 3300 engine still in its crate if anyone is interested. We are looking for GBP12500 for it. Peter Drake Hereford UK www.peterskr2s.co.uk -- I am using the free version of SPAMfighter. We are a community of 7 million users fighting spam. SPAMfighter has removed 1124 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message
KR> Canopy Frame
Hi I am planning on doing my canopy frame and hinges in a similar way to Mark L . I noticed he attached the frame to the plexiglass with epoxy. What type is best and should I rough the plexiglass up to get it to stick? Because of all the problems we have encountered with using a Jabiru 3300 engine, mainly down to weight and balance but also resistance from the LAA due to the power of the engine and a lack of data to support our case. We are probably going to go down the Jabiru 2200 route which is what was in mind when various mods had been done to the airframe in the first place! (before I had the project) The main consideration being weight, as it is about the lightest engine of its size around. I have in my garage a brand new Jabiru 3300 engine still in its crate if anyone is interested. We are looking for GBP12500 for it. Peter Drake Hereford UK www.peterskr2s.co.uk -- I am using the free version of SPAMfighter. We are a community of 7 million users fighting spam. SPAMfighter has removed 1124 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message
KR> Canopy Frame
Peter, Isn't the 3300 a better fit for the KR as the weight is much closer to the VW 2180 which was the engine most used in that plane I am thinking you are going to have much more W&B issues with the 2200. Just use a good epoxy and definitely rough it up very rough. Nothing will stick really well, but as long as you glass over the edge, it won't come off. I used AeroPoxy for everything on my plane except where I had to use Vinyl Ester. See N64KR at http://KRBuilder.org - Then click on the pics See you at the 2012 - KR Gathering in Mt. Vernon, Il MVN 40th Anniversary There is a time for building and it is over. Daniel R. Heath - Lexington, SC -Original Message- I noticed he attached the frame to the plexiglass with epoxy. What type is best and should I rough the plexiglass up to get it to stick? Because of all the problems we have encountered with using a Jabiru 3300 engine
KR> Canopy Frame
Peter Drake wrote: >>I am planning on doing my canopy frame and hinges in a similar way to Mark >>L . I noticed he attached the frame to the plexiglass with epoxy. What >>type is best and should I rough the plexiglass up to get it to stick?<< Yep, you'd definitely want to rough up the edges of the canopy to help with adhesion. I certainly did, using 50 grit or so, I believe. Mask over the area adjacent to ensure that you don't accidently scratch it though. I proved it's good to 245 mph, if that'll work for you. I used Aeropoxy for that connection, as I did the whole rest of the composite parts of the plane, and there was never so much as a hint of separation with that connection, but I'd think that most any high strength epoxy would work as well. Drilling holes in it is asking for trouble. One thing I'd do differently is to move the canopy hinge attach points out to the longerons to stabilize things to the max, while lightening and simplifying things, as done on the Bambi and also John Martindale's plane. Last time I went looking, John's link was dead, so if somebody knows what it is now, please update me. http://www.flycorvair.com/martindale.html shows some good shots of his Corvair engine (and canopy hinge arrangement). I'm still wearing my LAA (Light Aircraft Association) fleece with pride, and just last night an old-timer aviator asked what the Light Aircraft Association was. I had to explain the whole arrangement, and how the LAA (former PFA) and Francis Donaldson have to walk a tightrope to keep the feds happy, while allowing at least a little aviation to happen! I heard a lot of stories there regarding ultra-conservative "engineering" that didn't make much sense to me, I must confess. Americans don't realize how lucky we are to be able to build pretty much whatever we want and fly the things. I bought the fleece at the "big" airshow at Sywell. I met Richard Mole there (for probably the 10th time) when I was fortunate enough to have the company paying for a seven month TDY in England. I thoroughly fell in love with the place. Details are at http://www.n56ml.com/england/ , and there's plenty of aviation in there as well... Mark Langford ML at N56ML.com website at http://www.N56ML.com
KR> Canopy Frame
What type is best and should I rough the plexiglass up to get it to stick? -- I used west system, but I'm told any Epoxy will work. BUT since I did mine, a friend who makes canopies told the Polyester resin sticks much better to the plexi then epoxy, then you could use the epoxy to make the frame as it will stick VERY well to the Polyester. Or use polyester for all the frame. Get an off cut of plexi and use polyester on one and epoxy on the other and see which one comes off the easiest, you will be surprised, I was. Both work well. Phil Matheson Down under. ___ Search the KRnet Archives at http://mylist.net/private/krnet/ to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Canopy Frame
I believe that "Todds" canopy instructions I received with my canopy stated not to use polyester because it will eventually cloud the plexi. But then I would ask the manufacturer of the bubble first. Don't trust me. Steve Phillabaum Shorter, Alabama (Just down the road from Tuskegee Airport and Museum) -Original Message- From: Phil Matheson To: 'KRnet' Sent: Sun, Feb 19, 2012 9:27 pm Subject: RE: KR> Canopy Frame What type is best and should I rough the plexiglass up to get it to stick? - I used west system, but I'm told any Epoxy will work. BUT since I did mine, a friend who makes canopies told the Polyester resin ticks much better to the plexi then epoxy, then you could use the epoxy to ake the frame as it will stick VERY well to the Polyester. Or use polyester for all the frame. Get an off cut of plexi and use polyester on one and epoxy on the other and ee which one comes off the easiest, you will be surprised, I was. Both work well. Phil Matheson own under. ___ earch the KRnet Archives at http://mylist.net/private/krnet/ o UNsubscribe from KRnet, send a message to krnet-le...@mylist.net lease see other KRnet info at http://www.krnet.org/info.html __ earch the KRnet Archives at http://mylist.net/private/krnet/ o UNsubscribe from KRnet, send a message to krnet-le...@mylist.net lease see other KRnet info at http://www.krnet.org/info.html
KR> Canopy frame / radios
> >Chris Johnston wrote:> Just remember that >radio waves do not travel through carbon fiber. >Regular cloth works very well for that purpose and costs 5 times less and >you only have to use one layer > > > People that say this crack me up! Do radio waves go through aluminum? ++ Not very well. That's why the antennas on spam cans are on the outside. If I'm not mistaken, the aluminum skin is used as a ground plane. Then again, I may not know what I'm talking about. :-) Larry Flesner
KR> Canopy frame wanted
Would anyone have a canopy frame for a plans built KR2 for sale. Thanks Brad
KR> Canopy frame weight
KR - Friends. We are almost finished with de canopy frame for the dragonfly canopy. Made it from CF. Knows some body wat a reasoneble weight is for the frame. I am just interested what we made is it not to heavy or is it very light. I think we are about 9 pounds. This is inclusief the locking mechanism. Thanks Stef Stef and Ted are building the KR-2S see http://www.masttotaalconcept.nl/kr2
KR> Canopy frame weight
Made a calculation mistake. It is almost 2 KG so about 4.4 pounds. Stef Stef and Ted are building the KR-2S see http://www.masttotaalconcept.nl/kr2 Van: krnet-boun...@mylist.net namens stef...@kpnmail.nl Verzonden: do 18-8-2011 8:23 Aan: kr net Onderwerp: KR> Canopy frame weight KR - Friends. We are almost finished with de canopy frame for the dragonfly canopy. Made it from CF. Knows some body wat a reasoneble weight is for the frame. I am just interested what we made is it not to heavy or is it very light. I think we are about 9 pounds. This is inclusief the locking mechanism. Thanks Stef Stef and Ted are building the KR-2S see http://www.masttotaalconcept.nl/kr2 ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
