Pietenpol-List: cooling eyebrows

matronics · Post by **matronics** » Sat Oct 26, 2002 5:26 pm

Original Posted By: ZigoDan(at)aol.com
Howdy, low 'n' slow fliers;Not sure if this is of any help unless you're using a Franklin engine, but may be good for some cooling eyebrow ideas anyway. There are some fairly close-up pictures of the eyebrows on Ernie Moreno's Piet on my website, at http://www.flysquirrel.net/piets/piets2.html The last picture on the page is the most detailed.Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.nethttp://resour ... __________

matronics · Post by **matronics** » Mon May 08, 2006 1:50 pm

Original Posted By: Gene Beenenga

matronics · Post by **matronics** » Mon May 08, 2006 2:19 pm

Original Posted By: "walt evans"

matronics · Post by **matronics** » Mon May 22, 2006 11:24 am

Original Posted By: Robert Toliver
X-MS-Has-Attach: X-AOL-DATE: Mon, 22 May 2006 12:17:55 PM Eastern Daylight Time________________________________

matronics · Post by **matronics** » Mon May 22, 2006 1:48 pm

Original Posted By:

matronics · Post by **matronics** » Mon May 22, 2006 2:15 pm

Original Posted By: Matt Dralle

matronics · Post by **matronics** » Mon May 22, 2006 3:15 pm

Original Posted By: KMHeide
Harvey asks->I need to know if there are plates below the cylinder jugs on the bottom?Well, when I got 41CC it didn't have the intercylinder baffles but I've since added them. I heard varying stories (they're absolutely essential; they didn't use them on J-3s; you don't need them if you hang the cylinders out in the breeze, etc. etc.) and they were so simple to make and install that it was a no-brainer.Templates for the little baffles are in Tony Bingelis' books and they are easily formed from soft aluminum sheet and held in place with some all-thread with metal locknuts, or even safety wired in place.I can take pictures of mine if anyone is interested. There is a top and a bottom baffle on each side, mine are held together sandwiching the cylinder gap space. They force the cooling air to stay around the cylinders rather than "jumping out" the gap between the cylinders without cooling the rearmost cylinders.Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________Date: Mon, 22 May 2006 14:24:04 -0700 (PDT)

matronics · Post by **matronics** » Mon May 22, 2006 4:54 pm

Original Posted By: KMHeide
sweet Jesus! this is just what I need!!!! dimensions?? width at firewall and height? radius of arc on top? If they fit my GN1 I will take a set ASAPDJ Veghveghdesign.comMesa, AZ 602.743.5768 ----- Original Message -----

matronics · Post by **matronics** » Mon May 22, 2006 9:03 pm

Original Posted By:

matronics · Post by **matronics** » Tue May 23, 2006 8:59 am

Original Posted By: barnstmr(at)aol.com

matronics · Post by **matronics** » Sat May 27, 2006 3:51 pm

Original Posted By:

matronics · Post by **matronics** » Thu Jan 04, 2007 12:35 pm

Original Posted By: "Oscar Zuniga"
There was a set of cardboard templates of the J-3 cooling eyebrows making the rounds about a year ago. I think they were taken from the templates that Mike Cuy used to make his from. Anybody know where they are now? Sounds like it could save somebody a few $$ and plenty of time not having to reverse-engineer them.I have plenty of photographs of the eyebrows on 41CC thanks to Corky's documentation of the construction process.Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net_________________________________________________________________The MSN Entertainment Guide to Golden Globes is here. Get all the scoop. http://tv.msn.com/tv/globes2007/?icid=n ... __________

matronics · Post by **matronics** » Sun Jan 06, 2008 8:44 pm

Original Posted By: Oscar Zuniga
Dick N. asked-> On your eyebrows, did you make the ends that attach to the valve covers > of steel? I Made the 1 1/2" end of steel and rivited it to aluminum. Corky built the eyebrows and it looks to me like all components are aluminum. I'll sure take your idea under advisement.Oscar ZunigaSan Antonio, TXmailto: taildrags@hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________

matronics · Post by **matronics** » Sun Jan 16, 2011 7:22 pm

Original Posted By: Woodflier(at)aol.com
Cracking of aluminum eyebrows seems rampant, and I was wondering. wouldanother thin metal be more crack resistant? Thin steel wouldn't add muchweight, and might re less prone to harden and crack? I don't mind a littleextra weight on the nose anyhow.I know the attach points to the cylinder nuts need to be steel so they don'tcrush over time, and I know the attach straps should rivet onto the shrouditself on a large surface using many rivets to distribute the vibration.Was just rethinking the whole material ideaDouwe________________________________________________________________________________

matronics · Post by **matronics** » Sun Jan 16, 2011 7:35 pm

Original Posted By: "Billy McCaskill"
Subject: Pietenpol-List: Weight and balance calculationsWeighed the airplane today, and was real pleased that the empty weight came out out to be 634 lbs. In doing the weight and balance calculations back home, I find that I'm close to the rear limit of 20" aft of the leading edge when my big butt is in the rear seat. I used the center of the rear seat as the CG of the occupant but I'm seeing that a more accurate location of the occupant's CG is under the navel, or in my case, an inch or so aft of the front of the seat bottom. If that's the case, I'm within the aft limit. Any thoughts on this or am I just avoiding the fact that I really need to lose a few lbs myself?Matt Paxton________________________________________________________________________________Subject: Pietenpol-List: Re: cooling eyebrows

matronics · Post by **matronics** » Sun Jan 16, 2011 7:46 pm

Original Posted By: "Jack Phillips"
Sounds like a reasonable idea to me Douwe, but then again I'm not an A&P, metallurgist,or engineer. Other more knowledgeable list members should definitelycomment on this.--------Billy McCaskillUrbana, ILtail section almost done, starting on ribs soonRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________

matronics · Post by **matronics** » Sun Jan 16, 2011 8:28 pm

Original Posted By: owner-pietenpol-list-server(at)matronics.com
I doubled the thickness of the aluminum in my shrouds and went to 5052,which is a more fatigue resistant alloy that 3003. We'll see how long theylast.Jack PhillipsNX899JP "Icarus Plummet"Raleigh, NC _____

matronics · Post by **matronics** » Sun Jan 16, 2011 8:30 pm

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Sounds like you're in good shape, Matt. The pilot's belt buckle is theaccepted cg location of the pilot. Mine is a bit aft of 20" aft of the LE.I'm at 34% of chord, or about 20.4" aft of the LE, and it flies just fine.Jack PhillipsNX899JP "Icarus Plummet"Raleigh, NC _____

matronics · Post by **matronics** » Mon Jan 17, 2011 5:24 am

Original Posted By: Douwe Blumberg
Douwe,With your ability you could make those eyebrows out of some appropriate alloy of brass. I can visualize a highly-polished cowling eyebrow assembly. That would be cool to see. Let's get some new ideas out there!Dan HelsperPoplar Grove, IL. -----Original Message-----

matronics · Post by **matronics** » Mon Jan 17, 2011 5:35 am

Original Posted By: "Charles Campbell"
Matt,I agree with Jack about your W & B being fine. I am told the airplane actually flies better when the balance is toward the rear anyway. My airplane (model A) is actually nose heavy. I was very surprised because the conventional wisdom is that the Piet is always tail heavy. Walt Bowe (Model A, from California) told me his came out nose heavy also. I set my engine mount to the plans, and I was very worried because of the conventional wisdom. Some model A fellows move the engine forward as much as 7 inches (Ken Perkins). I am able to trim it out in flight, but it still bugs me, and I am racking my brain on how to actually add more tail weight (magically, without consequences) so the CG can move back. I am about 155# so I guess this is the reason.Dan HelsperPoplar Grove, IL. ________________________________________________________________________________

matronics · Post by **matronics** » Mon Jan 17, 2011 6:12 am

Original Posted By: helspersew(at)aol.com
I didn't know that any grown man was ever that light -- 155? Wish I could say that! ----- Original Message -----

matronics · Post by **matronics** » Mon Jan 17, 2011 3:57 pm

Original Posted By: Dave and Connie

matronics · Post by **matronics** » Mon Jan 17, 2011 4:15 pm

Original Posted By: owner-pietenpol-list-server(at)matronics.com
I remember now where I saw this setup with a coil in the line to take thevibration and motion. As usual, just about any question on how to build anairplane is covered in the Bingelis books. Look in Firewall Forward, onpage 173, figure 5. You'll see exactly what I was talking about.Jack PhillipsNX899JP "Icarus Plummet"Raleigh, NC _____

matronics · Post by **matronics** » Tue Jun 03, 2014 10:04 am

Original Posted By: "Douwe Blumberg"
I believe I've mentioned this before, but "RE-PIET" began life withoutcooling eyebrows because I liked the "clean cylinder" look so much. Basedon the Rose Parakeet, I omitted the eyebrows, but installed a temporary CHTto see how things went.Long story short, RE-PIET now sports cooling eyebrows and intercylinderbaffling.Even in fall temps, the CHT would climb pretty high during a longish climb.I figured that didn't bode well for summer flying so made up a set ofeyebrows, installed the intercylinder baffling and have enjoyed worry freetemps ever since.That's my story, your mileage may vary.$.02________________________________________________________________________________

matronics · Post by **matronics** » Fri Apr 28, 2017 9:35 pm

Original Posted By: helspersew(at)aol.com
Anyone make their tank from fiberglass? What's the best cloth to use - seems there are many advantages and disadvantages to each style.Tom B. ________________________________________________________________________________Subject: Re: Pietenpol-List: cooling eyebrows

matronics · Post by **matronics** » Fri Apr 28, 2017 9:35 pm

Original Posted By:>
> > > > > > > > > > > > > > > > > > > > > > > I doubled> the thickness of the> aluminum in my shrouds and went to 5052, which is a more> fatigue resistant> alloy that 3003. Well see how long they> last. > > > > > Jack> Phillips > > NX899JP> Icarus Plummet > > Raleigh,> NC> > > > > > > > > > > > > > > >

matronics · Post by **matronics** » Fri Apr 28, 2017 9:35 pm

Original Posted By:>
> > > > > > > > > > > > > > > > > > > > > > > I doubled> the thickness of the> aluminum in my shrouds and went to 5052, which is a more> fatigue resistant> alloy that 3003. Well see how long they> last. > > > > > Jack> Phillips > > NX899JP > Icarus Plummet > > Raleigh,> NC> > > > > > > > > > > > > > > >

Brodhead Pietenpol Association