Brodhead Pietenpol Association

Original Posted By: "john francis"
danhelsper(at)aol.com wrote:> John,> > Before you make a mistake you might regret forever, please check the plans,which call for 7/32" floor thickness. 3/8" would be overkill and add unnecessaryweight. I myself would never deviate from the plans (unless the changes werereally necessary or cool-looking) used 1/4" since that is what was available.> > There seems to be a real power vacuum on this list since the "resignation".I am sure it will all be sorted out in due time. Applications for the Board ofCurmudgeons are still being accepted. But, in the end, the purists will prevail,as they rightly always do. > > Dan Helsper> Puryear, TN> > My bad. It was a long day and I have the 1/4 plywood in my shop. Dont evenhave a piece of 3/8th so I would of caught that. > > > > > ----------John FrancisRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Cross Braces

Original Posted By: "Catdesigns"
I cant find these two cross braces on the plans. Can anyone enlighten me as towhy they are there?--------John FrancisRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/imag ... ___Subject: Pietenpol-List: Re: Cross Braces

Original Posted By: "Catdesigns"
Johnlook at the plan sheet labeled Drawing No. 1. (upper right corner) There are somedetail drawings in the lower right corner of this sheet. Look at the one forthe fire wall. You will see the upper one is for the engine tray and the loweris to back up the firewall to floor joint.--------ChrisSacramento, CAWestCoastPiet.comRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Cross Braces

Original Posted By: "Douwe Blumberg"
Woops, I see you have two lower braces. I'm guessing the builder added anotherone because the lower one interferes with the lower engine mount fittings andhas to be trimmed short of the side.This is what some would call a builder improvement............. but is likely notneeded.--------ChrisSacramento, CAWestCoastPiet.comRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________

Original Posted By: "womenfly2"
It appears to be a lot lighter too.Another "Simplicate and add lightness."possibility.Maybe even close to helium filled ping pongballs.ClifThe one thing I am most afraid of is a new idea.Chairman Mao I have barely heard of Oratex. Can't be better than my ice cream ! My gelato is damned good too. Thanks Sent from my iPhone________________________________________________________________________________Subject: Pietenpol-List: Re: Cross Braces

Original Posted By: "john francis"
See the "shelf" detail under "constructional view of front of fuselage". It callsfor an 1 1/4" x 1 1/2" Ash top motor mount bearing brace and a 3/4" squareSpruce lower floor board brace. Sorry for the picture size, but it better to readat this scale.Enjoy the journey! .... WF2--------Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Cross Braces

Original Posted By: "womenfly2"
Thanks for the responses and I do see them on the prints. However, with a Corvairengine, I believe these are modified because of the mounts. I just need toknow how.John--------John FrancisRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Cross Braces

Original Posted By: "Gary Boothe"
You did not mention Corvair engine. ;)WF2--------Read this topic online here:http://forums.matronics.com/viewtopic.p ... __________

Original Posted By: owner-pietenpol-list-server(at)matronics.com
John,The corvair doesn't change much, if anything, especially if you use the WWmount. One thing I am very glad I did (stole the idea from Jim Boyer), wasto glue some "firewall placement dowels" in the x-piece supports (that's whythey are longer than plans). That piece of plywood must have come off and onat least 100 times! After final attachment, just cut the dowels flush andinstall the firewall metal. If you don't have a forward fuel tank, you canuse the x-piece as a support for a forward baggage.Gary BootheNX308MB-----Original Message-----

Original Posted By: glenschweizer(at)yahoo.com
Gary,Thanks, the picture explains a lot. Did you build the top crosspiece as the planssuggest and notch it to fit around the front strut? That I cant see in thepicture.John--------John FrancisRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/cros ... __________

Original Posted By: owner-pietenpol-list-server(at)matronics.com [mailto:owner-pietenpol-list-server(at)matronics.com] On Behalf Of john francis
No. that is done as extra support for the Model A engine.Gary BootheNX308MB-----Original Message-----

Original Posted By: "William Wynne"
Thanks for the resource, William!--Jeffrey H. Boatright, PhD, FARVOAssociate Professor of OphthalmologyEmory University School of MedicineOn 3/12/14 2:20 AM, "William Wynne" wrote:>>Pieten-people,>>If builders and fans have not had a chance to see it, I have a single>page on my main site where all of our Piet and BHP stories are collected.>It is at this link:>>http://flycorvair.net/2013/11/28/corvai ... -page/>>It is not all Corvair stuff, it has information on the life and influence>of BHP, Cabanes and fuel lines, Weight and Balance, mount construction,>landing gear design, props, cooling, box spars, etc. There are 34>separate stories there, a few hundred photos.>>I like Corvairs, but I am not a zealot about them. I am glad to provide>information to any builder, I don't care what has or will power his>plane. I have many happy hours behind All manner of Continentals and>Lycomings, Radials from PW, Warner, Wright and the Russians, even Olds>and Chevy V-8s....(But never a Rotax 912)... We even own a Schweizer>1-26 that has no motor at all.>>If you are a Continental or Ford guy our two webpages still have info you>can use. http://www.flycorvair.com/ has pages on carbs, thrust and HP>testing, FI and props. http://flycorvair.net/ has nearly 500 stories,>many on instrumentation, wiring, flight tests, books and more. Plenty of>things to learn there, even if we have nothing for you to buy.-ww>>>Read this topic online here:>>http://forums.matronics.com/viewtopic.p ... ______This e-mail message (including any attachments) is for the sole use ofthe intended recipient(s) and may contain confidential and privilegedinformation. If the reader of this message is not the intendedrecipient, you are hereby notified that any dissemination, distributionor copying of this message (including any attachments) is strictlyprohibited.If you have received this message in error, please contactthe sender by reply e-mail message and destroy all copies of theoriginal message (including attachments).________________________________________________________________________________Subject: Pietenpol-List: Re: Cross Braces

Original Posted By: "john francis"
John, To add to what Gary and others have said; As pointed out, the strength of the cross brace in the original plans is becauseit is the aft end of the motor mount bearers. This was common in the'20s, lookat how an OX-5 is in a jenny (it is kind of imbedded in the fuselage but itis on bearers) Fast forward to the 1960s and look at BHP's original Corvair mount. At first glanceit is an odd structural design, but looking at it, the purpose emerges asa retrofit to existing fuselage construction. It has two large steel main tubesthat are taking the function of the ash bearers. BHP's Corvair mount is alsotied into the cross brace that forms the bottom of the shelf. The mounts we build today are different. Here is a view of one of our mounts onthe same airframe, Mark Chouinard's, that was used as your original picture:http://flycorvair.net/2013/10/17/pieten ... -airframe/ On a modern build, the cross brace has much lower load on it, and it can be madelight, as in Gary's photos. However, I want everyone to understand that theplywood firewall must now go all the way to the top of the upper longerons (orhigher) because it stabilizes them against the slight load they get pulling themtogether. I have flown a modern mount on our Piet with a low firewall and shelf (Our planewas originally Ford powered) without thinking about it much, but I went backlater and raised the firewall to full height and put a 1"x1" cross brace on itjust below the top longerons to stiffen it .Gary's plane has the thrust line in the stock location, which also mimics the Fordinstallation. This is required on a BHP Corvair conversion, because he retainedthe blower fan. A modern electric start Corvair can have the thrust linemoved up 3" without getting into the top cowl. This was tested on our Piet in1999. The modern mounts we make in our fixture all come this way. I have handbuilt a few with the original low line for guys like Bob Lester, who was tryingto fit an original cowl, but all the ones you see on projects like Mark Chouinard's,Kevin Purtee's, Dave Aldrich's, Jim Boyer's and Terry Hand's are allhigh thrust line mounts. There is some pretty good photos covering thrust linesand axle location at this link:http://flycorvair.net/2012/11/08/pieten ... ts/-wwRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Cross Braces

Original Posted By: "womenfly2"
Picture of Mark Chouinard Piet and his Corvair motor mount ... may help.WF2--------Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Cross Braces

Original Posted By: "taildrags"
Picture of Mark Chouinard Piet and his Corvair motor mount ... may help. Your bracesalmost look the same.WF2--------Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Cross Braces