Today's Message Index:
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1. 08:13 PM - Re: substituting 7075 T6 aluminum for 4130 steel (Ted Brousseau)
2. 11:37 PM - diesel air camper (allen smith)
Message 1
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| Subject: | Re: substituting 7075 T6 aluminum for 4130 steel |
--> Pietenpol-List message posted by: "Ted Brousseau" <nfn00979@naples.net>
DJ
Sorry to be so late in responding. I volunteered for the week at SnF. Just
got caught up in reading all the messages.
I used a plain ole wood bandsaw, at regular speed, with a regular wood blade
(3/8 or 1/2). It cuts 4130 like butter. Doesn't do good on curves though.
But that is not a problem. Just rough cut it and then finish on a grinding
wheel or sanding wheel. Really wasn't a problem and I got some pretty nice
looking metal fittings.
Ted Brousseau
Naples, FL
Just getting back up to speed after missing 10 days.
----- Original Message -----
From: "DJ Vegh" <aircamper@imagedv.com>
Subject: Pietenpol-List: substituting 7075 T6 aluminum for 4130 steel
> --> Pietenpol-List message posted by: "DJ Vegh" <aircamper@imagedv.com>
>
> I'm at the point now in the project where I need to build the center wing
> section and bolt it up to my cabanes.
>
> I'm building the GN-1 variant which has a slightly different method of
> attaching the wing than a Piet. It uses .065" 4130 steel plates that bolt
> to both sides of the center section spar and also to the wing spar. The
> plates stick out past the spars and have a hole in them where you slip a
> bolt through to join the center section and wing plates.
>
> My problem is in cutting these plates. I do not have a slow speed metal
> band saw and I'm not sure even if I did I'd want to cut the 4130 myself.
So
> I drew up the plates in a CAD format and was going to have a laser cutting
> shop cut them out for me.
>
> I just got the quote from a couple places today. Anywhere from $25 to $35
a
> piece. There are 16 pieces total. That's $400 to $560 for wing spar
> plates!!?*
>
> WAY too much if you ask me. So I got to thinking. What's the problem if
I
> use .19" (3/16) 7075 T6 aluminum? I can use my carbide wood cutting
> equipment to mill them out myself. I did a bit of research and found that
> if I tripled the thickness, 7075 T6 aluminum would be equal to or stonger
> than 4130 in tensile and shear strength.
>
> If I do it in aluminum I save myself about $350. I can sure use that
extra
> $$ to get a carb (see
> http://www.aeroconversions.com/images/Aero_Carb_032701.jpg ) for my
Corvair.
>
> I'll go 4130 steel, but I need a better(cheaper) solution to cutting
them...
> otherwise it's 7075 T6.
>
> Gimme some feedback on this...
>
> DJ Vegh
> N74DV
> imagedv.com/aircamper
> Mesa, AZ
>
>
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>
Message 2
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| Subject: | diesel air camper |
--> Pietenpol-List message posted by: "allen smith" <allenfarleysmith@hotmail.com>
Dear Pietenpol folks
Has anyone tried to fly a Pietenpol with the new 1.9 l VW TDI (diesel )
engine? Seems to me that the high torque low RPM engine ( 155 ft. lbs @
1900 RPM ) would allow you to sling a nice big prop similar to that used
with an A powered air camper. Obviously, weight may be the major obstacle.
What would be an acceptable maximum engine weight considering that you may
even end up with an increase in available power?
Thanks,
Allen Smith
allen.smith@insitugroup.net
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