Original Posted By: "Cuy, Michael D. (GRC-RXD0)[Vantage Partners, LLC]"
Hey chaps (and lasses.)Just found an interesting article from a 1996 Buckeye Pietenpol AssociationNewsletter about a guy (Joe Leonard from Garrettsville, OH) experimentingwith his center section cut-out.To Paraphrase. He had a cut-out in his center section with a roundedtrailing edge. Somebody at Brodhead suggested the founded edge was causingturbulent airflow over the tail.As an experiment, he laminated up some foam shaped it to fill the cutout,duct taped it in place nad went flying.He did three landings and take-offs, a few stalls etc and reports "it waslike flying a totally different airplane! Stall speed dropped about 5 m.p.h.The best climb rate previously occurred at 65 m.p.h, with the cut-outfilled, it dropped to 60 m.p.h." "With the center section closed, it floatslike a cub at 60. The rate of climb has not increased and I'm still notsure if the cruise speed has increased or not." "I've been telling peopleall along the center section is not a factor in creating lift, which istrue, BUT it affects a bunch of other things."Pretty interesting info to ponder for those eliminating the flop. MayBernhard new what he was doing??DouweProgress report; had a granite engraving friend cut some stencils fromadhesive backed rubber for my tail numbers and a little tail logo (decidedagainst anything on the fuselage because with the side pipes it was toobusy) and that worked great. She now has some stuff on the tail. Going topinstripe the edges of the letters today.When I was building my wheels I forgot grease fittings, plus they're coveredso. rather than having to remove the wheels to grease them (no biggiereally) I welded up a little tube with a ninety degree in it and a greasefitting on one end. This goes inside the axle just behind the wheelretaining cap and is welded into a little hole in the axle between thebearings in the wheel. When I shoot grease into it, it comes out inside thewheel.Triple checking the engine installation before I install the cowling.Working on seat cushion designsDid one coaming then started the other and found out I had underestimatedhow many eyelets I needed so that stopped until more are delivered.The only area I sprayed latex over the old dope, under my center section, isstaying a little tacky. Am hoping it'll dry up eventually.Starting my tailwheel re-education soon from one of the EAA pilots of theFord Tri-motor here in beautiful Fallmouth, KY!!!________________________________________________________________________________
Pietenpol-List: center section cut out
Pietenpol-List: Re: center section cut out
Original Posted By: "skipgadd(at)earthlink.net"
My understanding is Bernard claimed that a cutout was equivalent to cutting twofeet off the wing span.Read this topic online here:http://forums.matronics.com/viewtopic.p ... __________
My understanding is Bernard claimed that a cutout was equivalent to cutting twofeet off the wing span.Read this topic online here:http://forums.matronics.com/viewtopic.p ... __________
Pietenpol-List: center section cut out
Original Posted By: shad bell
Mikee wrote->I have a cutout with a handhold and my plane stalls power off at 29 mph.>Build it light and it will stall nicely with or without a cutout.>My empty weight is 632 lbs.If you've ever seen pictures of Mike, it's hard to tell that he weighsthat much, but maybe it's the loose-fitting tee shirts that he wears. Ormaybe he meant that his *airplane's* empty weight is 632? ;o)Scout came in with an empty weight of 636 when I did the new W&B afterswapping in the A75 engine and that's with three quarts of oil in the sump.No center section cutout... my airplane has a hinged flop.Like "Four-Eight-Mike-Charlie", "Four-One-Charlie-Charlie" stalls so lowdown on the airspeed indicator arc that I know the reading can't possiblybe accurate. Pitot is out on the starboard side jury strut, just downfrom the wing leading edge, so it's well out of the propwash. The pointis, build it light and it will fly great, stall at a very slow airspeedwith good controllability, and you'll love flying it.Oscar ZunigaAir Camper NX41CC "Scout"Flying Squirrel N2069Z "Rocket"Medford/Ashland, ORwebsite at http://www.flysquirrel.net ________________________________________________________________________________Date: Wed, 4 Jul 2012 11:35:41 -0700 (PDT)
Mikee wrote->I have a cutout with a handhold and my plane stalls power off at 29 mph.>Build it light and it will stall nicely with or without a cutout.>My empty weight is 632 lbs.If you've ever seen pictures of Mike, it's hard to tell that he weighsthat much, but maybe it's the loose-fitting tee shirts that he wears. Ormaybe he meant that his *airplane's* empty weight is 632? ;o)Scout came in with an empty weight of 636 when I did the new W&B afterswapping in the A75 engine and that's with three quarts of oil in the sump.No center section cutout... my airplane has a hinged flop.Like "Four-Eight-Mike-Charlie", "Four-One-Charlie-Charlie" stalls so lowdown on the airspeed indicator arc that I know the reading can't possiblybe accurate. Pitot is out on the starboard side jury strut, just downfrom the wing leading edge, so it's well out of the propwash. The pointis, build it light and it will fly great, stall at a very slow airspeedwith good controllability, and you'll love flying it.Oscar ZunigaAir Camper NX41CC "Scout"Flying Squirrel N2069Z "Rocket"Medford/Ashland, ORwebsite at http://www.flysquirrel.net ________________________________________________________________________________Date: Wed, 4 Jul 2012 11:35:41 -0700 (PDT)