Brodhead Pietenpol Association

Original Posted By: Ray Krause
Hello A guys..What kind of RPM do you see or use for takeoff and cruiseJust wondering as I do more ground runs..I've been having an issue with blowing water out of the overflow..not overheatingjust blowing it out at high rpm's.I added a steam tube to the front of the head...cut down the impeller blades onthe water pump a bit after a bit of reading on modern radiators and old pumps.. put in a 160 deg thermostat today mostly as a restrictor and that seems to havehelped a lot.. i think the water was just being pumped too fast to the top tankat full power.but that got me thinking... what is cruise RPM on the AjeffRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Stabilizer brackets..

Original Posted By: Gary Boothe
Help!Are the guide wire brackets on the stabilizer mounted on the spar at the same levelas the "rib" (cap strips) so that the bracket is then mounted after coveringand on top of the fabric? Or are the brackets mounted on the spar, belowthe rib level so that the brackets are under the fabric and only the tips thatattach to the guide wires protrude through the fabric?I remember seeing this on Jim Boyer's Piet, but cannot remember how they were setup.Thanks,Ray KrauseSkyScoutSent from my iPad________________________________________________________________________________

Original Posted By: "CraigAho"
The answer is, "Yes." It's your call. Mine are under the fabric.GarySent from my iPhoneOn Apr 5, 2013, at 3:21 PM, Ray Krause wrote:> > Help!> > Are the guide wire brackets on the stabilizer mounted on the spar at the samelevel as the "rib" (cap strips) so that the bracket is then mounted after coveringand on top of the fabric? Or are the brackets mounted on the spar, belowthe rib level so that the brackets are under the fabric and only the tips thatattach to the guide wires protrude through the fabric?> > I remember seeing this on Jim Boyer's Piet, but cannot remember how they wereset up.> > Thanks,> > Ray Krause> SkyScout> > Sent from my iPad> > > > ________________________________________________________________________________Subject: Pietenpol-List: Re: Stabilizer brackets..

Original Posted By: Ray Krause
On my NX40772 I had them on the surface. I will have to take a look at those whohave put them under to see how I would like to do it on the next go round.CraigRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/file ... __________

Original Posted By: Jim Boyer

Original Posted By: Ray Krause
Thanks, Jim!I am leaning towards doing it that way; but I will never be able to race Gary's airstream Piet!Jim, are your cabanes steel or aluminum? What are you doing for the main struts?Thanks,RaySent from my iPadOn Apr 5, 2013, at 6:35 PM, Jim Boyer wrote:> Hi Ray,> > If you mean the mounting tabs for the stabilizer brace wires. Mine are mounted at the same level as the top of the stabilizer ribs so they are on top of the fabric.> > Cheers,> > Jim> > > > > > > > ============================================================================================================================================> ________________________________________________________________________________

Original Posted By: Jack
Winner or loser! The guy is second place is the first loser! Gary is so COMPETATIVE,RaySent from my iPadOn Apr 5, 2013, at 6:36 PM, Jim Boyer wrote:> Ray what is the difference between 75 mph and 75.2 mph?> > Jim> > > > > > ============================================================================================================================================> ________________________________________________________________________________Subject: Re: Pietenpol-List: Re: Cables; control and brace

Original Posted By: "Douwe Blumberg"
I once tried to drill out a link, does not work in hardened state...Sent from my iPadJack TextorOn Apr 4, 2013, at 4:04 PM, "TOM STINEMETZE" wrote:> > Mark:> > I purchased a length of #50 chain from Tractor Supply along with a Chain Breaker(around $10) which makes short work of separating the links. For less than$20 you can have a drawer full of links.> > Tom Stinemetze> N328X> >>>> "Mark Roberts" 4/4/2013 3:24 PM >>>> > Thanks Guys!> > I appreciate the info. I guess I am looking for the actual chain and disassemblethe links, or is ther #50 masters a type of link (another name for a connectorlink that has the clip on one side...) I will stop at The Home Depot onthe way home.> > Thanks again!> > Mark> > > > > Read this topic online here:> > http://forums.matronics.com/viewtopic.p ... 871#397871 > > > > > > > > > > > > > > > > ________________________________________________________________________________

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Thinking about waxing my plane for xtra speedwhat do they use on those P-51=99s at Reno?Gary BootheNX308MB

Original Posted By:> owner-pietenpol-list-server(at)matronics.com [mailto:owner-pietenpol-li
Snot...Sent from my iPadJack TextorOn Apr 6, 2013, at 7:04 AM, "Gary Boothe" wrote:> Thinking about waxing my plane for xtra speedwhat do they use on those P-51=99s at Reno?> > Gary Boothe> NX308MB>

Original Posted By:> owner-pietenpol-list-server(at)matronics.com [mailto:owner-pietenpol-li
See, I told you!Ray Krause Sent from my iPadOn Apr 6, 2013, at 5:04 AM, "Gary Boothe" wrote:> Thinking about waxing my plane for xtra speedwhat do they use on those P-51=99s at Reno?> > Gary Boothe> NX308MB>

Original Posted By: Jim Boyer

Original Posted By: Jim Boyer

Original Posted By: Ray Krause
Thanks, Jim. I remember they were pretty thin (fore and aft) and looked really neat. I am copying Gary's (?) and trying to make them out of wood. I made one set and did not like them, started a new set today. Sure takes a lot of stickum to laminate them!Gary, hat wood did you use?Thanks,Ray Krause Sent from my iPadOn Apr 6, 2013, at 8:04 PM, Jim Boyer wrote:> Hi Ray,> > My cabane struts are steel streamline from AS&S; I am going to use the aluminium wing struts from Carlson Aircraft. I belied Dan Helsper used them on his Piet. He had some really nice photos of how to connect them at each end; they are on Chris Tracy's West Coast Piet site.> > Cheers,> > Jim> > > > > > ============================================================================================================================================> ________________________________________________________________________________

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Hickory. 3 laminations, 1=9D thick x 2 =C2=BC=9D.Gary BootheNX308MB

Original Posted By:> owner-pietenpol-list-server(at)matronics.com [mailto:owner-pietenpol-li
Did you include any plywood in the laminations? I just laid up the cabanes with a center layer of mahogany, two layers of 1/8" plywood then a layer if VG Doug Fir on the outside. Final Outside measurements are 11/8" by 2". Of course, that will be worked down in shaping.What grain orientation do you look for with hickory, any? What about main struts?Thanks,RaySent from my iPadOn Apr 6, 2013, at 10:32 PM, "Gary Boothe" wrote:> Hickory. 3 laminations, 1=C3=A2=82=AC=C2=9D thick x 2 =C3=82=C2=BC=C3=A2=82=AC=C2=9D.> > Gary Boothe> NX308MB>

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Ray,No plywood laminations on mine. I seriously doubt if plywood adds any strength.maybe some character. The attached picture is of my current lift struts. You can see the orientation. Also, a strength chart, that shows tensile strength, which is really what you need. Following is my favorite excerpt from an email I got from the very wise Clif Dawson, nearly 4 years ago:"Spruce has a tensile strength of 6700 lb/square inch.For the sake of argument let=99s say a strut is 1" X 3 1/2". With streamlining the area should be 2/3 of the square area, or 2.3 square inch. There are four struts or 5.2 square inches. That=99s 34840 lbs( yes I know the front ones take the majority of the load) .Dividing on the assumption of equal load on a 1200 lb AC we get 29 g! How much less if properly calculated? 25 g? 20 g? Is this adequate?There's a bolt at each end. The strength here is based on how much force required to pull a plug of wood out by the bolt. That plug has two faces, the square area of which is the width of the strut times the distance from the end to the bolt. If the strut is 1" thick and the bolt is 1" from the end then you have two faces each 1" square or two square inches. The "shear parallel to the grain" is 1120 lb per square inch. So we have a strength here of 2240 lb. Four struts so that=99s a total of 8960 lb. That's still over 7 g. If we added another such bolt we have 14 g capacity. Taking into account the higher front strut stress I'd bet we still have at least 10 g to play with.And this is for plain, solid spruce, no plywood, no laminated straps or embedded tubing or anything else to complicate matters. You can add a little more strength by using Western Hemlock or Doug Fir but not much. "Gary BootheNX308MB

Original Posted By:> owner-pietenpol-list-server(at)matronics.com [mailto:owner-pietenpol-li
Gary,Thanks so much! That really helps a lot. I printed this out as a permanent reference. Beautiful work!Ray Krause Sent from my iPadOn Apr 7, 2013, at 8:57 AM, "Gary Boothe" wrote:> Ray,> > No plywood laminations on mine. I seriously doubt if plywood adds any strength.maybe some character.> > The attached picture is of my current lift struts. You can see the orientation. Also, a strength chart, that shows tensile strength, which is really what you need. Following is my favorite excerpt from an email I got from the very wise Clif Dawson, nearly 4 years ago:> > "Spruce has a tensile strength of 6700 lb/square inch.> For the sake of argument let=99s say a strut is 1" X 3 1/2". With > streamlining the area should be 2/3 of the square area, or 2.3 square inch. There are four struts or 5.2 square inches. That=99s 34840 lbs( yes I know the front ones take the majority of the load) .Dividing on the assumption of equal load on a 1200 lb AC we get 29 g! How much less if properly calculated? 25 g? 20 g? Is this adequate?> > There's a bolt at each end. The strength here is based on how much force required to pull a plug of wood out by the bolt. That plug has two faces, the square area of which is the width of the strut times the distance from the end to the bolt. If the strut is 1" thick and the bolt is 1" from the end then you have two faces each 1" square or two square inches. The "shear parallel to the grain" is 1120 lb per square inch. So we have a strength here of 2240 lb. Four struts so that=99s a total of 8960 lb. That's still over 7 g. If we added another such bolt we have 14 g capacity. Taking into account the higher front strut stress I'd bet we still have at least 10 g to play with.> > And this is for plain, solid spruce, no plywood, no laminated straps or embedded tubing or anything else to complicate matters. > > You can add a little more strength by using Western Hemlock or Doug Fir but not much. "> > Gary Boothe> NX308MB>