Brodhead Pietenpol Association

Original Posted By: "walt evans"
OK, I am ready to drill and need to know what everyone has done with the front of the fin . . . offset it or not????? If you don't, do you end up having to put a trim tab on the rudder?? (which I DO NOT want to do)Please help!Gene________________________________________________________________________________Date: Mon, 28 Apr 2008 18:22:23 -0400

Original Posted By: Gene Rambo
Gene,The LE of the vertical fin on NX18235 is offset about 3/4" and it could use about 1/8" more.If you can build the attachment brackets to allow for ground adjustment you might save some heartburn later.Greg ----- Original Message -----

Original Posted By: walt evans
I guess it would help to know which engine and fuselage you guys have before I can make an informed decision. I have the short fuselage and model A engine, maybe those of you with longer fuselages don't need to offset???Gene ----- Original Message -----

Original Posted By: Pastor Mike Townsley

Original Posted By: Gene Rambo
Good point.NX18235 is a long fuselage, A-65 powered Air Camper. Engine is offset about 1" to the right, fin is offset to the left about 3/4" and I need to hold a little right rudder in cruise. No trim tabs installed or desired.Greg Cardinal ----- Original Message -----

Original Posted By: Clif Dawson

Original Posted By: "Phillips, Jack"
Hey there,I bought my plane as a started project and the fuse was pretty much built. Never really cked if it's the long or short fuse. What is the length of each, and is it measured from firewall to tailpost?Finally up to the color coats in the doping process, thank God the color coats cover better than the silver or I'd be going through ten gallons. It really looks nice and it feels great to see the wings and tail parts in the final color. My question is this. I want to paint my numbers large on the wings. I'm going to use rounded numbers as they were more common in the early thirties until CAA mandated the squared style. What would be a good way to mask a rounded shape like this, especially on a wing which isn't flat between the ribs? what did you guys do?Douwe________________________________________________________________________________Subject: RE: Pietenpol-List: vertical fin offsetDate: Tue, 29 Apr 2008 07:36:12 -0400

Original Posted By: "Phillips, Jack"

Original Posted By: Phillips, Jack
Now that I am clamping and drilling, I am finding that even if I make extra holes for offsetting the fin, the rear fitting will not allow the fin to move without really stressing the rear spar, so I am now thinking that I will just make it straight and live with it.Gene ----- Original Message -----

Original Posted By: Pastor Mike Townsley

Original Posted By: Tim Verthein

Original Posted By: "Phillips, Jack"

Original Posted By: "chase143"
Jack, Congrats!! What an honor!Gene in Tennessee________________________________________________________________________________Subject: Pietenpol-List: Re: vertical fin offset

Original Posted By: "Phillips, Jack"

Original Posted By: "chase143"
> Isn't it the little turbine that's putting out the huge rpms that boost> the engine?They feed back the used exhaust and they use it to drive that> little bugger which in turn gives extra drive to the main engine.My> understanding of a turbine and a super charger are two different things> though.A turbine once started operates at a constant speed The speed of a turbocharger changes with engine RPM, although not directlycoupled. It's like a water wheel on an old mill, driven by the flow of theriver, except it uses exhaust gases instead of water. The "water wheel" thenturns an impeller, via a shared shaft, which forces air into the inductionsystem. The harder the combustion gases push the "water wheel", the fasterthe impeller spins, and the faster it spins, the more air is forced into thecombustion chamber.Shaft speed is ultimately limited by a waste gate which is essentially ahole that opens to bypass some of the exhaust gasses, reducing the forces onthe "water wheel".> where as a supercharger is only used for> short periods like for take offs or drag racing.A super charger is a> feed back system sort of like an after burner on a jet.A supercharger works much in the same way except that the impeller isn'tturned by exhaust gases, it's belt-driven off the crankshaft. http://static.howstuffworks.com/gif/sup ... -6a.jpgThe two most common superchargers are centrifugal, like with theturbocharger or screw driven.http://images.chevyhiperformance.com/te ... pgAlthough superchargers are mostly recognized on dragsters and funny cars,they see daily duty in diesel trucks and many "modern" automobiles such assome mid 80's Ford Thunderbirds and late 90's (early 2000's) Pontiac GrandPrix, not to mention the Mercedes Benz C230 Kompressor Sport Sedan.Supercharging and turbocharging were most likely developed and certainlyrefined (perfected) during WWII for high-altitude flying.Many "modern" piston powered aircraft use turbocharging, especially thosethat have pressurized cabins. John Steere has a supercharged Thunderbird Powered BD-4. We wrote about itseveral years ago in CONTACT! Magazine.I hope this helps.Pat________________________________________________________________________________Subject: Pietenpol-List: Re: vertical fin offset

Original Posted By: "Phillips, Jack"
Jack,Excellent point! I think several FMS recipients (mostly European) adopted chutes.Yes, I don't think anything will want to get that Low and Slow to escort you.Are you bringing your Piet to the Air Show/Open House at Andrews in May?Steve C.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: RE: Pietenpol-List: Re: vertical fin offsetDate: Wed, 30 Apr 2008 15:08:50 -0400

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