Brodhead Pietenpol Association

Original Posted By: "Sutton, Mark"
Thanks Mike! I wasn't sure if I was going to use truss screws like you did or #8machine screws with blind nut plates. I think your method will be my weaponof choice. .Thanks again!Kyle--------Airspeed, altitude or brains: Two are always needed to successfully complete theflight.Read this topic online here:http://forums.matronics.com/viewtopic.p ... __________

Original Posted By: owner-pietenpol-list-server(at)matronics.com [mailto:owner-pietenpol-list-server(at)matronics.com] On Behalf Of Barry Davis
Subject: RE: Pietenpol-List: In Carrollton for a couple days...today....Barry, I'm a Piet builder over in Locust Grove Ga. Would love to get some adviceon finishing my project, can't make this Monday nite but would love to nextMonday nite. Is that alright? -----Original Message-----

Original Posted By: airlion
Chuck,Truss head screws have a larger head diameter, and lower profile than round headscrews. They provide more bearing surface under the head, and protrude less.I've attached a handy old handmade chart that I used to use for drafting - backin the days when screws were drawn by hand (instead of computer).Bill C.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/scre ... ______Date: Mon, 5 Mar 2012 14:50:38 -0800 (PST)

Original Posted By: Michael Perez
Just would like to thank Mr. Cuy for giving me this idea for the center wing lid.Here is my version so far..--------Airspeed, altitude or brains: Two are always needed to successfully complete theflight.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/img_ ... ______Date: Thu, 8 Mar 2012 14:51:35 -0800 (PST)

Original Posted By: "Kyle85"
Chuck,Hans' drawing actually does specify the thickness (.025), just above the Bill ofMaterials chart. http://mykitplane.com/Planes/PeoplesFil ... ng.pdfBill C.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: center section storage lid hinge-to-front spar

Original Posted By: "dgaldrich"
Chuck, Here is a picture of my trial fit. Still need to figure out a way to mount thepiano hinge to my front spar in order for my piano hinge to mount flush with the"skin" I may need to bond a strip of wood to the top of my spar to take upthe gap and then mount to that. My method of attaching will still be truss screws.Kyle--------Airspeed, altitude or brains: Two are always needed to successfully complete theflight.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/img_ ... ___Subject: Pietenpol-List: Re: Bendix magneto starting issues

Original Posted By: "C N Campbell"
Jim: Think about this from a theory point of view. When the points CLOSE, the C isout of the picture -- it's shorted out -- so you have an RL circuit. As the fieldbuilds up, the current goes from 0 toward a steady state that is determinedsolely by the R in the circuit. That R is a function of the ballast resistorand the internal resistance of the coil. The RL time constant determines theshape of the first part of the curve I drew.Side note: Notice that the faster the engine runs, the earlier on that curve thepoints open. That means less energy stored in the coil to produce a spark.As a conventional system speeds up, the spark actually becomes weaker. Notso with magnetos. The faster the magneto turns (up to a point) the more energyis available. The faster a wire moves through a magnetic field, the more inducedvoltage. The slower the movement, the less voltage. That's why magnetoscan sometimes be hard to start and why impulse couplings were developed. Theimpulse coupling accelerates the magnets through the windings in a ratchet kindof motion.Now the points open. You have a series RLC circuit with a DC supply voltage. That is a circuit that cannot resonate and is what is called a band pass filter.Only frequencies in a range around the square root of 2*Pi*L*C if memory serves,will get through. DC will not.The graph I drew is actually incorrect. The current in the low voltage/primarywinding actually drops to zero almost immediately. The energy stored in themagnetic field of both coil windings has only one way to dissipate and that'sthrough the high voltage/secondary side via the spark plug which has much lesseffective resistance than the primary side.What you may have read about is some of the solid state systems may have a resonantcircuit used to charge a capacitor in a system commonly known as a CDI forCapacitor Discharge Ignition. There is no such thing as a DC transformer soin order to get a higher than 14 v supply, the system either uses a resonantcircuit or chops dc in very short on/off pulses. These look like AC to a transformerand by proper selection of windings, you can get almost any AC voltageyou want. Rectify it and - voila - high(er) voltage DC. That's the principlethe 110 v adapters you plug in your cigarette lighter work on.This is probably one of those cases of "ask me what time it is and I'll tell youhow to build a watch".Hope this helps.DaveRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________

Original Posted By: "Kyle85"
Yeah, Kyle, that's what I did to make everything line up. I just cut a piece approximately the shape I needed, glued it on, and then shaped it with a block plane so that everything lines up. Your pic looks great. I was originally planning to cover just the area between the main spars. I'm about to run it on back to where the aileron spar goes -- like Mike and, apparently, you did. I also liked Mike's design of the little compartment where he can get to the aileron cables and pulleys. Thanks for your help. Chuck----- Original Message -----

Original Posted By: Michael Perez

Original Posted By: Ben Charvet

Original Posted By: "dgaldrich"
Jim,Now THAT would take some serious hand-eye coordination.Unless you mean doing the two activities separately. :)Jim Ash wrote:> My bucket list includes (amongst a hundred other things) playing the banjo andpainting a landscape. Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Bendix magneto starting issues

Original Posted By: Jim Ash
First, I've reread my posts on this subject and I must admit that they do soundpedantic. That was not my intent. I probably would have made a terrible teacher.I'm also with you on the banjo.Did some more research on the subject and it turns out we are both correct. Thebasic theory as we have both described it is correct. Points open, field collapses,spark occurs. The selection of correct values for coil and condenservalues require an analysis of the type you describe. There ARE alternating currentharmonics generated, as there are any time you open or close a DC switch.R, L, and C are chosen to control/dampen that oscillation as fast as possible-- 3 to 4 oscillations max --and still have a rapid, controlled field collapse/hotspark. The field collapse that produces the spark is pretty much a singleDC only event. The oscillation really is more of an unwanted by-productof physics than it is necessary for the function of spark production since thecircuits do not continue to oscillate past the 3 or 4 damped cycles. I foundsome typical L and C numbers and the resonant frequency for the primary circuitis something like 10 khz. Considering a 4 cylinder engine at 3000 rpm firesat a 100 hz rate, the time spent oscillating is close to inconsequential. That was (sort of) my point. DaveRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Sun, 11 Mar 2012 23:38:29 -0400 (GMT-04:00)

Original Posted By: "Ben Charvet"
Hi BenYou can come over and hang out with me and Skip Gadd and whoever else shows up. I will have some cold beer.I'm already in Fla. Camping on the Okachabee waterway at the St. Locks.Dick N.612-805-1742----- Original Message -----

Original Posted By: owner-pietenpol-list-server(at)matronics.com
BenSorry, no Big Piets at Sun n Fun this year, especially after they sent us abill for $28,000 for moving and cleanup.Barry -----Original Message-----

Original Posted By: airlion

Original Posted By: Ben Charvet

Original Posted By: Dan Yocum

Original Posted By:> owner-pietenpol-list-server(at)matronics.com
> --> Pietenpol-List message posted> by: "Sutton, Mark" > > Barry, I'm a Piet builder over in Locust Grove> Ga. Would love to get some advice on finishing my> project, can't make this Monday nite but would love to next> Monday nite. Is that alright? > > -----Original Message-----