Brodhead Pietenpol Association

Original Posted By: Dougl52955(at)aol.com
Subject: Pietenpol-List: Re: Fishmouth>The * and x are the same: corrosion resistant aircraft bolt. Ref: Bingelis;>Sportplane Construction Techniques; pg. 20>>________________________________________________________________________________

Original Posted By: Matt Kirk
Fishmouthing is just a "V" notch in the end of a tube. A tube welded allaround in a straight line is a no-no because it makes that tube prone toaxial failure. The v notch (that looks like a fish's open mouth whenfetching for a hook or Mike Cuy for a candy bar), spreads that heatedarea out along those angles of the v notch. Old timers have told me thatwelding around a tube in a straight line or circumference is akin tocutting the tube a quarter of the way thru, that much strengthloss.........especially in shear.Question of the day: Any of you guys ever notice that some A.N. Boltshave an asterisk * on the head instead of an X ....? Or why ?Earl Myers -----Original Message-----

Original Posted By: GREA738(at)aol.com
Subject: Fishmouth Fishmouthing is when you shape the metal around a carp's face... Actually it just describes the shape that you cut the metal in toprovide a good fit for welding.________________________________________________________________________________

Original Posted By: Ken Beanlands
In a message dated 09/14/1999 11:30:48 PM Eastern Daylight Time, farmerdel(at)rocketmail.com writes:>Del,A little hard to describe. Say your end fitting body is 1" dia., make the straight portion about 4" long and on the end opposite the fitting machine a deep "vee" with unequal ends. Easier, and just as effective, machine an unequal outside "vee".Attached is a .bmp sketch of the side view of a fitting. "A" is the fishmouth, "B" is the outside vee. However you do it keep the ends of the vee uneven by about 25%, and vee both the plug and tube. If you have the EAA book "Building the Custom Aircraft with Welding" look at the page titled " Typical welded steel tube terminals". Good luck!Den________________________________________________________________________________

Original Posted By: robert hensarling
The * and x are the same: corrosion resistant aircraft bolt. Ref: Bingelis; Sportplane Construction Techniques; pg. 20 ________________________________________________________________________________

Original Posted By: Earl Myers
Fishmouthing is when you shape the metal around a carp's face...Actually it just describes the shape that you cut the metal in toprovide a good fit for welding.Fishmouthing is when you shape themetal arounda carp's face...Actually it just describes the shapethat youcut the metal in to provide a good fit for welding.________________________________________________________________________________

Original Posted By: GREA738(at)aol.com
On Wed, 15 Sep 1999, Earl Myers wrote:> Question of the day: Any of you guys ever notice that some A.N. Bolts> have an asterisk * on the head instead of an X ....? Or why ? Earl> MyersI believe it denotes different manufacturers.Ken Beanlands B.Eng (Aerospace)Calgary, Alberta, CanadaChristavia MK 1 C-GREN________________________________________________________________________________

Original Posted By: User554784(at)aol.com
Corrosion Resistant bolts have a single dash on the head. I will check thisreference you pointed out.....sounds like a mis-interpretation. AND NOTE:Altho these bolts will rust over time, they are made of "coldheading gradestainless steel". The carbon added to make them coldheadable is whatenhances the rust or corrosion as well as the copper lubing that sometimesdoesn't get cleaned off.........they are mainly intended for high tempapplications like turbos or exhaust systems........the little 18-8 (grade303-306 ) stainless machine/sheetmetal screws are the ones that won't rust,at least in our lifetime...........Earl Myers-----Original Message-----

Original Posted By: nle97(at)juno.com
Fishmouth is the shape you can cut into the end of a tube to be weldedonto a smaller diameter tube that slips inside the larger tube. A 30degree cut can also be made and is acceptable, but the FAA does preferthe fishmouth weld as it provides more welding surface (suppossedly). Ihave repaired a couple of plane with a fishmouth weld and it is moredifficult than the 30 degree weld. I usually use the latter since it'squicker and I don't see that the weld area is actually less. I also liketo have the weld joint spread over a larger area. Where space is aproblem, the fishmouth often fits in better.John Langstonwrites:>Fishmouthing is when you shape the metal around a carp's face...>Actually it just describes the shape that you cut the metal in to >provide a good fit for welding. __________________________________________________________________________________________