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#1
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K8b restoration
I was given a junked K8b due to water damage to the wood at the wing root and multiple tears in the original fabric and chipped/peeling paint. However, it looks like it may be restorable (worth it, that's another story). Anyway, I'm interested to know if there is an online repair manual that lays out the specific techniques of repairing or replacing wood in the wings, and specifications on what type of wood to be used, etc. I looked around and found the list of ADs, but nothing that laid out what I am looking for. I've contacted Schleicher as well, but they simply directed me to a link on their website, that didn't really give the information I needed. This is a certified glider, and I'd like to keep it that way, as I'm hoping to use it as a club glider.
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#2
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K8b restoration
On Fri, 01 Feb 2019 17:29:37 -0800, John Foster wrote:
I was given a junked K8b due to water damage to the wood at the wing root and multiple tears in the original fabric and chipped/peeling paint. However, it looks like it may be restorable (worth it, that's another story). Anyway, I'm interested to know if there is an online repair manual that lays out the specific techniques of repairing or replacing wood in the wings, and specifications on what type of wood to be used, etc. I looked around and found the list of ADs, but nothing that laid out what I am looking for. I've contacted Schleicher as well, but they simply directed me to a link on their website, that didn't really give the information I needed. This is a certified glider, and I'd like to keep it that way, as I'm hoping to use it as a club glider. If you can't find anything more specific, this might help: Workshop Practice For Building and Repairing Wooden Gliders and Sailplanes by Hans Jacobs publisher Eqip, 45 euros. Available from Eqip, amazon.de or www.vintagesailplane.org I've no personal experience of that book, but I do have some of Eqip's other books (Sailplanes 1920-1945, Sailplanes 1945-1965 and Sailplanes 1965-2000, which are excellent. -- Martin | martin at Gregorie | gregorie dot org |
#3
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K8b restoration
At 02:05 02 February 2019, Martin Gregorie wrote:
On Fri, 01 Feb 2019 17:29:37 -0800, John Foster wrote: I was given a junked K8b due to water damage to the wood at the wing root and multiple tears in the original fabric and chipped/peeling paint. However, it looks like it may be restorable (worth it, that's another story). Anyway, I'm interested to know if there is an online repair manual that lays out the specific techniques of repairing or replacing wood in the wings, and specifications on what type of wood to be used, etc. I looked around and found the list of ADs, but nothing that laid out what I am looking for. I've contacted Schleicher as well, but they simply directed me to a link on their website, that didn't really give the information I needed. This is a certified glider, and I'd like to keep it that way, as I'm hoping to use it as a club glider. If you can't find anything more specific, this might help: Workshop Practice For Building and Repairing Wooden Gliders and Sailplanes by Hans Jacobs publisher Eqip, 45 euros. Available from Eqip, amazon.de or www.vintagesailplane.org I've no personal experience of that book, but I do have some of Eqip's other books (Sailplanes 1920-1945, Sailplanes 1945-1965 and Sailplanes 1965-2000, which are excellent. -- Martin | martin at Gregorie | gregorie dot org Schleicher has all the drawings. The plywood used is birch, GL I spec. Measure thickness or original material when replacing. Some is 5 ply, but most ia 3-ply. Wood is spruce by heart. Specs are in the Jacobs book. Wooden Sxhleichers are known to suffer from Kaurit glue joint brittleness by ageing, and a full glue survey of wings, fin and controls would be prudent to see if a rebuild is viable. Have a look at the YouTube channel “Kaurit in gliders” to see what to look for... |
#4
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K8b restoration
On Saturday, February 2, 2019 at 1:15:04 AM UTC-6, Eric Munk wrote:
Much snippery... Wood is spruce by heart. Sorry, Eric, bust I must disagree with you on that. Keifer is not the same as Spruce. If you use Spruce in equivalent thickness, you come out with a weaker spar. Also, to another comment. Longer scarfs required for Keifer and backing blocks, as dictated by AC43.13 are not to be used, as they impart a "stiff spot" in the wing. Please buy a copy of the translation of Workshop Practices, join VSA, and absorb the knowledge that is available through this group (VSA). Steve Leonard |
#5
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K8b restoration
Kiefer is Pine, however can't you just pick the wood in the local warehouse, there is specifications as curls per cm, humidity etc to be OK for planes.
Workshop Practice by the Vintage Sailplane Association is translated from German and covers all you need to know on wood, selection, testing, gluing etc and some more. |
#6
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K8b restoration
At 17:32 02 February 2019, Steve Leonard wrote:
On Saturday, February 2, 2019 at 1:15:04 AM UTC-6, Eric Munk wrote: Much snippery... Wood is spruce by heart. Sorry, Eric, bust I must disagree with you on that. Keifer is not the same as Spruce. If you use Spruce in equivalent thickness, you come out with a weaker spar. Also, to another comment. Longer scarfs required for Keifer and backing blocks, as dictated by AC43.13 are not to be used, as they impart a "stiff spot" in the wing. Please buy a copy of the translation of Workshop Practices, join VSA, and absorb the knowledge that is available through this group (VSA). Steve Leonard Always happy to stand corrected, Steve. Have been putting lots of Kiefer in Schleicher's finest as of late, on the European side of the Atlantic, but thought spruce would be a good translation for it... PS: the VSA's translation of Jacobs' masterpiece is lovely! |
#7
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K8b restoration
Jacob’s book is the definitive work in this field.
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#8
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K8b restoration
At 01:29 02 February 2019, John Foster wrote:
I was given a junked K8b due to water damage to the wood at the wing root a= nd multiple tears in the original fabric and chipped/peeling paint. Howeve= r, it looks like it may be restorable (worth it, that's another story). An= yway, I'm interested to know if there is an online repair manual that lays = out the specific techniques of repairing or replacing wood in the wings, an= d specifications on what type of wood to be used, etc. I looked around and= found the list of ADs, but nothing that laid out what I am looking for. I= 've contacted Schleicher as well, but they simply directed me to a link on = their website, that didn't really give the information I needed. This is a= certified glider, and I'd like to keep it that way, as I'm hoping to use i= t as a club glider. As a general guide download "Standard Repairs to Gliders" from the BGA website. It's in the Airworthiness section of their library, in a number of chapters. Link to chapter 1: https://members.gliding.co.uk/wp- content/uploads/sites/3/2015/04/1430312226_Section%201.pdf Specific information on the Ka8 has to come from Schleicher. |
#9
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K8b restoration
At 10:48 02 February 2019, James Thomson wrote:
At 01:29 02 February 2019, John Foster wrote: I was given a junked K8b due to water damage to the wood at the wing root a= nd multiple tears in the original fabric and chipped/peeling paint. Howeve= r, it looks like it may be restorable (worth it, that's another story). An= yway, I'm interested to know if there is an online repair manual that lays = out the specific techniques of repairing or replacing wood in the wings, an= d specifications on what type of wood to be used, etc. I looked around and= found the list of ADs, but nothing that laid out what I am looking for. I= 've contacted Schleicher as well, but they simply directed me to a link on = their website, that didn't really give the information I needed. This is a= certified glider, and I'd like to keep it that way, as I'm hoping to use i= t as a club glider. As a general guide download "Standard Repairs to Gliders" from the BGA website. It's in the Airworthiness section of their library, in a numbe of chapters. Link to chapter 1: https://members.gliding.co.uk/wp- content/uploads/sites/3/2015/04/1430312226_Section %201.pdf Specific information on the Ka8 has to come from Schleicher. Contact Rattlesden GC.They are have almost finished the renovation of a K13 which had the glue issue. |
#10
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K8b restoration
It might be best to start with an thorough inspection by someone with wood repair and wood rot knowledge. Also ask about requirements to return the ship to service. Where are you located? In the US, the best way to go would be to license the ship in the Experimental category which can be used in clubs.
Hope this helps, JJ |
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