Original Posted By: "Owen Davies"
I was just wondering if anyone here had any experiences with the rotaryengines, like the Mazda RX7's have (or had) and if they would be good on anaircamper!?! If anyone could give me any information about them I wouldappreciate it! Thanks!!One other question.. I've heard about using a Subaru engine.. but can'tremember if it was an EA81 or EA82.. Thanks ahead of time for any input!--ShawnGulfport, MS________________________________________________________________________________
Pietenpol-List: Rotary Engines
Re: Pietenpol-List: Elmer's and Pine
Original Posted By: "John McNarry"
Michael Brusilow observed:> Correct me if I am wrong, but white pine is a FAA approved material> & I do believe that weldwood glue is the only FAA approved glue.White pine surely is approved, though AC 43.13-1b notes thatit is "somewhat low in hardness and shock-resisting capacity.Cannot be used as substitute for spruce without increase in sizesto compensate for lesser strength." That last probably doesn'tapply to the Piet, of course, given how much it's overbuilt.I've attached the section of AC 43.13-1b that deals with glue.My machine was virus-free until this e-mail, none of which hadany attachments, so the file should be safe.If you don't want to bother opening it, the gist is that the FAAmore or less passes the buck. What they say is,"(2) Adhesives meeting the requirements of a MilitarySpecification (Mil Spec), Aerospace Material Specification(AMS), or Technical Standard Order (TSO) for wooden aircraftstructures are satisfactory providing they are found to becompatible with existing structural materials in the aircraftand the fabrication methods to be used in the repair."Then they look at half a dozen varieties of glue. They say thatcasein glues are obsolete, urea-formaldehyde glues "shouldbe considered obsolete," and phenol-formaldehyde glues are"not practical for use in structural repair." (I think Weldwoodis a phenol-formaldehyde glue, but can't remember for sure.)Epoxies get qualified approval "providing they meet therequirements of paragraph 1-4a," of which the quotation aboveis the clearest part. The only unqualified endorsement is forresorcinol, which they say "fully meets necessary strength anddurability requirements."The entire text of AC 43.13-1b can be downloaded as zippedPDF files at http://www.moneypit.net/~pratt/ac43/ .(Incidentally, hi, Mike. We met years ago, when Don Stoopscame by to pick up that Ford engine. He's flying an Ercoupethese days. Neither of us has yet gotten a Piet into the air.It's coming, though. Hope all's well with you.)Owen Davies________________________________________________________________________________
Michael Brusilow observed:> Correct me if I am wrong, but white pine is a FAA approved material> & I do believe that weldwood glue is the only FAA approved glue.White pine surely is approved, though AC 43.13-1b notes thatit is "somewhat low in hardness and shock-resisting capacity.Cannot be used as substitute for spruce without increase in sizesto compensate for lesser strength." That last probably doesn'tapply to the Piet, of course, given how much it's overbuilt.I've attached the section of AC 43.13-1b that deals with glue.My machine was virus-free until this e-mail, none of which hadany attachments, so the file should be safe.If you don't want to bother opening it, the gist is that the FAAmore or less passes the buck. What they say is,"(2) Adhesives meeting the requirements of a MilitarySpecification (Mil Spec), Aerospace Material Specification(AMS), or Technical Standard Order (TSO) for wooden aircraftstructures are satisfactory providing they are found to becompatible with existing structural materials in the aircraftand the fabrication methods to be used in the repair."Then they look at half a dozen varieties of glue. They say thatcasein glues are obsolete, urea-formaldehyde glues "shouldbe considered obsolete," and phenol-formaldehyde glues are"not practical for use in structural repair." (I think Weldwoodis a phenol-formaldehyde glue, but can't remember for sure.)Epoxies get qualified approval "providing they meet therequirements of paragraph 1-4a," of which the quotation aboveis the clearest part. The only unqualified endorsement is forresorcinol, which they say "fully meets necessary strength anddurability requirements."The entire text of AC 43.13-1b can be downloaded as zippedPDF files at http://www.moneypit.net/~pratt/ac43/ .(Incidentally, hi, Mike. We met years ago, when Don Stoopscame by to pick up that Ford engine. He's flying an Ercoupethese days. Neither of us has yet gotten a Piet into the air.It's coming, though. Hope all's well with you.)Owen Davies________________________________________________________________________________