If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
DuoDiscus Wing
Enough time has past such that several DuoDiscus wings must have been
inspected. However, there have been no reports as to what was found during the inspection or what, if anything had to be done. All owner should communicate with each other so that we all can have a better handle on what is happening to the fleet. I would like to request that all owners provide the following information when available. It would be appropriate to obtain data for all ships; those that passed and those that failed. 1) Serial Number 2) Any problems doing the inspection 3) Results of the inspection 4) What repairs, if any, were required 5) Cost or reimbursement from Schempp-Hirth 6) Any other info that you would care to share. Some voids were found in the spar of the ship that I am involved with (S/N 217). In one spot a wire could be inserted for what appeared to be the full width of the spar cap. The ship was transported to M & H for a "second opinion" and any repairs as required. I will provide additional info when the ship is returned home. Duane |
#2
|
|||
|
|||
In article 3fRab.527488$uu5.88216@sccrnsc04,
says... Enough time has past such that several DuoDiscus wings must have been inspected. However, there have been no reports as to what was found during the inspection or what, if anything had to be done. All owner should communicate with each other so that we all can have a better handle on what is happening to the fleet. I would like to request that all owners provide the following information when available. It would be appropriate to obtain data for all ships; those that passed and those that failed. There is a thread on www.gliderforum.com under the Duo Discus section about this that might contain some of what you are after. -- !Replace DECIMAL.POINT in my e-mail address with just a . to reply directly Eric Greenwell Richland, WA (USA) |
#3
|
|||
|
|||
I am not involved with a duo but of the three inspected so far by our local
repair shop all required repairs, a 4th has still to be inspected. gary "Duane Eisenbeiss" wrote in message news:3fRab.527488$uu5.88216@sccrnsc04... Enough time has past such that several DuoDiscus wings must have been inspected. However, there have been no reports as to what was found during the inspection or what, if anything had to be done. All owner should communicate with each other so that we all can have a better handle on what is happening to the fleet. I would like to request that all owners provide the following information when available. It would be appropriate to obtain data for all ships; those that passed and those that failed. 1) Serial Number 2) Any problems doing the inspection 3) Results of the inspection 4) What repairs, if any, were required 5) Cost or reimbursement from Schempp-Hirth 6) Any other info that you would care to share. Some voids were found in the spar of the ship that I am involved with (S/N 217). In one spot a wire could be inserted for what appeared to be the full width of the spar cap. The ship was transported to M & H for a "second opinion" and any repairs as required. I will provide additional info when the ship is returned home. Duane |
#4
|
|||
|
|||
I would like to request that all owners provide
the following information when available. It would be appropriate to obtain data for all ships; those that passed and those that failed. 1) Serial Number 2) Any problems doing the inspection 3) Results of the inspection 4) What repairs, if any, were required 5) Cost or reimbursement from Schempp-Hirth 6) Any other info that you would care to share. Duane Some have responded directly to me. The info is appreciated, However .... Actually I was not trying to collect info just for me. I was hoping that the info would be posted to the Group so that owners around the world would also know what is being found and be better able to evaluate their Duo. Duane |
#5
|
|||
|
|||
"Duane Eisenbeiss" wrote in message news:3fRab.527488$uu5.88216@sccrnsc04... Enough time has past such that several DuoDiscus wings must have been inspected. However, there have been no reports as to what was found during the inspection or what, if anything had to be done. All owner should communicate with each other so that we all can have a better handle on what is happening to the fleet. Duane The report for the inspection of ship S/N 217 has been received. The left wing had 1 small void. The right wing had 4 small voids. Has anyone had an inspection that revealed large voids? say larger than 12 inches or 30 cm. Duane |
#6
|
|||
|
|||
One here in NZ had a void of 14-15 inchs long,the engineers here think
the problem has been from making the glue mixture to thin and it has just flowed out of the rear side as there is a ridged edge on the front side to make all the mix go towards the rear. One comment made was they thought that the factory had attempted to push some mix into that void by hand by reaching through the access point but had only been partially successful gary "Duane Eisenbeiss" wrote in message news:rQDhb.533114$Oz4.430152@rwcrnsc54... "Duane Eisenbeiss" wrote in message news:3fRab.527488$uu5.88216@sccrnsc04... Enough time has past such that several DuoDiscus wings must have been inspected. However, there have been no reports as to what was found during the inspection or what, if anything had to be done. All owner should communicate with each other so that we all can have a better handle on what is happening to the fleet. Duane The report for the inspection of ship S/N 217 has been received. The left wing had 1 small void. The right wing had 4 small voids. Has anyone had an inspection that revealed large voids? say larger than 12 inches or 30 cm. Duane |
#7
|
|||
|
|||
"goneill" wrote in message ...
One here in NZ had a void of 14-15 inchs long,the engineers here think the problem has been from making the glue mixture to thin and it has just flowed out of the rear side as there is a ridged edge on the front side to make all the mix go towards the rear. One comment made was they thought that the factory had attempted to push some mix into that void by hand by reaching through the access point but had only been partially successful gary ************************************************** ******************************** It would be interesting to know if there is a commonality between all of these discrepancies. Was the bonding paste always too thin or did they mix it according to the clearances of each wing? If the mixture really was too thin causing a void of 14-15 inches long then there are probably many other voids which can't be seen on video. There needs to be an ultrasonic inspection procedure developed which can map the bonding interface. |
#8
|
|||
|
|||
"Slingsby" wrote in message It would be interesting to know if there is a commonality between all of these discrepancies. Was the bonding paste always too thin or did they mix it according to the clearances of each wing? If the mixture really was too thin causing a void of 14-15 inches long then there are probably many other voids which can't be seen on video. There needs to be an ultrasonic inspection procedure developed which can map the bonding interface. I have no first hand knowledge. Talked to the owner of a well known, respected composite repair shop who said that cotton threads are added to the epoxy to thicken it and keep it from running. And that apparently they had failed to add enough cotton fiber and this resulted in epoxy running out, creating the voids. -- bumper - ZZ "Dare to be different . . . circle in sink." to reply, the last half is right to left --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.521 / Virus Database: 319 - Release Date: 9/23/2003 |
#9
|
|||
|
|||
"John Morgan" wrote in message ...
"Slingsby" wrote in message It would be interesting to know if there is a commonality between all of these discrepancies. Was the bonding paste always too thin or did they mix it according to the clearances of each wing? If the mixture really was too thin causing a void of 14-15 inches long then there are probably many other voids which can't be seen on video. There needs to be an ultrasonic inspection procedure developed which can map the bonding interface. I have no first hand knowledge. Talked to the owner of a well known, respected composite repair shop who said that cotton threads are added to the epoxy to thicken it and keep it from running. And that apparently they had failed to add enough cotton fiber and this resulted in epoxy running out, creating the voids. According to the DG website the bonding paste should be about as thick as cake icing. I suppose too much cotton would also weaken the bond as cotton fibres aren't as strong as epoxy. I still believe that if there are voids which can be seen and can have wires poked into them then there must also be voids which can't be seen and are far to thin to allow wire into them. A .0005 to .008mm thick gap between the spar cap and shear web could not be seen on a video but it would still be an area where there is no bond. Ultrasound would still reflect off of the interface and show a gap. The ultrasonic technique would need to be proven and calibrated on actual wings where voids have been found. Filling the voids immediately makes the chances of developing another inspection method unlikely. |
#10
|
|||
|
|||
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
ANG Woman Wing Commander Doesn't See Herself as Pioneer, By Master Sgt. Bob Haskell | Otis Willie | Military Aviation | 0 | March 18th 04 08:40 PM |
Props and Wing Warping... was soaring vs. flaping | Wright1902Glider | Home Built | 0 | September 29th 03 03:40 PM |
Can someone explain wing loading? | Frederick Wilson | Home Built | 4 | September 10th 03 02:33 AM |
An Affordable Homebrue 60 in DS machine | Grant | Soaring | 0 | August 8th 03 03:52 AM |
Wing Extensions | Jay | Home Built | 22 | July 27th 03 12:23 PM |