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Hi all, Developing a wing leading edge skin repair for a Czech Blanik L-23 glider and need to use CherryMax or equivalent rivets in a couple of locations. Blanik repair manual says "If the area is inaccessible from the inside...use special rivets with pins per the Standard 1646S49 (or 1646549...

Drawoh, Please do your homework.....In FAA speak a Designated Airworthiness Representative is a DAR and a DER is a Designated Engineering Representative. Typically neither has much to do with any revolutions. Primarily, the DAR is involved with Airworthiness issues and a DER with Engineering...

Drawoh, You cited the problem OK but unless I'm confused about the situation I think you need DER help not DAR help, Right?

Michael, We did the testing of the full-scale full deployed Vortex Ring chute in the settling chamber of the UAC main subsonic tunnel. The 18 ft octagonal test section was too small!! Neat project; I have a test report around here somewhere. Good luck, John Cragin

Michael Orenstein Speaking about ancient history of parachutes...I was involved in full-scale wind tunnel tests at United Aircraft Corp (Now United Technology)back in the 60's of a Vortex Ring parachute being developed hy Pioneer Parachute, Manchester, CT. Designed as I reccall by a Dave...

Hi All, I need material properties, primarily tensile strength, on 20 mil thick pvc film used for boat and tent windows, seat covers etc. This material is described as double polished, optically clear and cold crack resistant to -40 F Can anybody help with tensile strength details? Thanks JQCF1

Kontik99, I'd tell the ASI to go pound sand if he came up with that mandate!! Maybe the AD dimple was just filled with paint or Bondo?? What then? You'd do more damage replacing many 402 rivets than just leaving them alone. JQC DER/DAR

GBor Your finagle factor of 1.15 is right out of 23.625 and probably Part 25 and 27 as well. The problem is the definition of "fitting"?? I understand a seat belt fitting that goes between the nylon webbing and the seat. But what if the manufacturer identifies a widget as a "bracket" and the...

Hi all. When asked why the T-18 doesn't have more lightening holes, John Thorp's reply typically was "Because they weaken the stucture faster than they lighten it!! Agree?? John Q.

This string reminds me of an old saying in the post-WWII days by Theodore Von Karman a famous low speed aerodymacist from the Netherlands I believe. A typical aerodynamacist will define his problem condtions before proceding and will say "Assume the aircraft weighs 2000#, has xxx ft squared...

I'm chasing details of an STC SA3458WE that refs Volpar drawing list 5300, rev B of 6/28/77. Can anybody help in my search? To my recollection Volpar is long in the history books. Any source of Volpar dwgs? Thanks for any comments. John Q.

Hi Berkshire, We must be on the same frequency!! I also found Space Age Control (via Google) and some of their components look quite doable. Neat website. I forwarded their URL to my client and we'll see what he wants to do. He's holding the purse strings. I'm also proposing a Pitot probe at...

RB and Berkshire. Neat ideas. I like the trailing probe. This a/c is pressurized. How do we trail the p/s probe? ie, How do we release it to trail after take-off and retrieve it before landing? I've never used this scheme but it sounds like it will work. Are there kits available or do we...

Hi Rb and Field Team, We do not propose changing the pitot probes, just the radome configuration; and that not drastically. The static ports are on the aft fuselage and will not be disturbed. This TC'd a/c is currently operating on a Special/Experimental A/W cert (8130-7) so we can play games...

Hi all, We are considering minor exterior (aerodynamic) changes to a nose radome. Any leads as to how this will/might affect the pitot (total pressure) probe that is slightly aft of the radome. We are talking Vne appx 250kts. Any reasonable measure of probe standoff distance to fuselage...

Jim, Try Genuine Aircraft Hardware Co. 888-247-2738 for a very usable catalog. Mine is in daily use as a DER. Regards, John

To all the contributors to my question... My initial description was correct but not quite clear....mia culpa!! The three raised dashes are in a straight line (like a DD but three) not in the 43.13 form for a 7075-T73 head. The location was fairly benign so we went ahead with MS20470AD rivets...

Hi all, Looked at some impact damage on a wing LE of a TBM700 yesterday and the a/c is assembled with rivets with three small raised dashes on the head as a rivet identifier. Typically on US a/c, as you all know, it would be a single dimple identifier for an MS20470AD rivet in this...

Hi All, Can anybody lead me to MIL-HDBK 23, with a title something like Sandwich Construction?? I bombed out at Assist Shopping Wizard etc. Any help will be appreciated, thanks. John Q.

My thanks to all contributors to this string....Just what I needed. Your comments are all on the point. In actuality it is a vintage 11BC Chief, now with an STC'd 0-200 and we are going for twin 13 gal wing tanks and no fuselage tankage. Identical wing as Champ that has these tanks as option...