Original Posted By: Michael D Cuy
Hi Pieters, I'm back with another dumb question. The original Piet plans show 1 inch thick spars with routed sections tosave weight. The full-size rib pattern from BHP shows 1 inch thickspars also. The three piece wing supplemental sheet calls the sparsthree quarters of an inch. The Piet wood kit I received from AircraftSpruce contains spars that are three quarters of an inch. Since I ambuilding my wing rib jig now, I need to know which width to set it upfor and whether to contact ASS for a spar exchange. HELP!'Ol TomMcPherson Kansas ____ | ____ 8/ / ________________________________________________________________________________Date: Thu, 30 Dec 2004 11:23:07 -0500
Pietenpol-List: Spar Thickness
Re: Pietenpol-List: Spar Thickness
Original Posted By: Tom Stinemetze
Tom,It's builders choice. The 3/4" solid spar is easy, simple and equally strong asthe original routed 1" spar.If you want to experiment with built-up spars using plywood webs and spruce orfir flanges then you'll want to build your ribs to handle 1" spars.If you already have the 3/4" spar material then use it, don't complicate your life.I have a good article from an early '60's Sport Aviation on designing built upspars. I'll send out a copy to anyone who sends a self-addressed, stamped envelopeto:Greg Cardinal5236 Shoreview Ave. So.Minneapolis, MN 55417 ----- Original Message -----
Tom,It's builders choice. The 3/4" solid spar is easy, simple and equally strong asthe original routed 1" spar.If you want to experiment with built-up spars using plywood webs and spruce orfir flanges then you'll want to build your ribs to handle 1" spars.If you already have the 3/4" spar material then use it, don't complicate your life.I have a good article from an early '60's Sport Aviation on designing built upspars. I'll send out a copy to anyone who sends a self-addressed, stamped envelopeto:Greg Cardinal5236 Shoreview Ave. So.Minneapolis, MN 55417 ----- Original Message -----
Pietenpol-List: Spar Thickness
Original Posted By: Jim Ash
Re: Pietenpol-List: Spar Thickness
Original Posted By: "parts4u"
Subject: Re: Pietenpol-List: Spar ThicknessIn a message dated 12/30/04 10:22:26 AM Central Standard Time, stinemetze(at)mpks.net writes:>Tom,Set up your jig for the 3/4" spars, and use the quarter sawn, straight grain, spars that you have.Chuck G.________________________________________________________________________________
Subject: Re: Pietenpol-List: Spar ThicknessIn a message dated 12/30/04 10:22:26 AM Central Standard Time, stinemetze(at)mpks.net writes:>Tom,Set up your jig for the 3/4" spars, and use the quarter sawn, straight grain, spars that you have.Chuck G.________________________________________________________________________________
Re: Pietenpol-List: Spar Thickness
Original Posted By:
carry on your ok with 3/4" spars----- Original Message -----
carry on your ok with 3/4" spars----- Original Message -----
Re: Pietenpol-List: Spar Thickness
Original Posted By: Rcaprd(at)aol.com
Subject: Re: Pietenpol-List: Spar ThicknessCaution3/4 spars ok however make your spar positions on the rib jig adjustable for 3/4 and 1" spar openings to accomodate the root ribs, center plate and outboardribs which fit over the spar and spar plates and steel lift fittings. 3/4 + 1/8 + 1/8 = 1"Just a caution. If building the 3 pc wing this will require 8 ribs of 1" opening.Carve necessary clearances for steel.Corky in humid Louisiana but happy to be a part of this new year.________________________________________________________________________________
Subject: Re: Pietenpol-List: Spar ThicknessCaution3/4 spars ok however make your spar positions on the rib jig adjustable for 3/4 and 1" spar openings to accomodate the root ribs, center plate and outboardribs which fit over the spar and spar plates and steel lift fittings. 3/4 + 1/8 + 1/8 = 1"Just a caution. If building the 3 pc wing this will require 8 ribs of 1" opening.Carve necessary clearances for steel.Corky in humid Louisiana but happy to be a part of this new year.________________________________________________________________________________
Re: Pietenpol-List: Spar Thickness
Original Posted By: Rcaprd(at)aol.com
Subject: Re: Pietenpol-List: Spar ThicknessIn a message dated 1/2/05 9:00:19 AM Central Standard Time, Isablcorky(at)aol.com writes:>Very good point !! Another consideration might be to alter the size of the aft gusset of the rib that is at the inboard end of the aileron cut out. Or, you could just install the extended gusset while you are building the ribs, which would mean you have a R/H and a L/H rib in that location. Build new rib jig, so that the gussets and the upright x next to the spars, are spaced 28 1/16" to 28 1/8" apart. This should be the exact dimention between the spars, with the exception of the 3 center ribs, and the outboard ribs where the struts attach. These locations have 1/8" plywood doublerson each side of the spar. On my Model A Radiator installation, I used the center section of the wing, forward of the front spar, and designed so as to allow the top of the radiator to be within the wing. Two 1/8" plywood L.E. ribs were spaced evenlybetween, and paralell to, R1 and L1. These ribs will accept the 1/16" plywoodL.E. (on top), and the 1/32" plywood (within the radiator cavity). I had the radiator custom built so the top tank was inside the wing, out of the prop slipstream, and it was the width of the cabanes, and extended down about 12", soyou could see under the radiator. Hinges are numbered 1 thru 6, beginning on the left wing tip. Lots of places on the wing needed to be drilled using Granpap's hand crank drill (chordless !!), because of clearance reasons. Cable guide blocks were numbered 1 thru 8, starting at the top left. Jury strut C/L is 37" outboard of C/L of cabane strut attachments. I estimated the placement of the jury strut attachments by referring to the pictureof the Pietenpol on the 1999 I A M Union Calender. The 1/8" Plywood doublers, located at the center section and the lift strut attachments, should have Spaded Ends (football shaped). These doublers bring the width of the spar to the plans width of 1", and allow the plans dimentions to be used for all the fittings.Chuck G.________________________________________________________________________________
Subject: Re: Pietenpol-List: Spar ThicknessIn a message dated 1/2/05 9:00:19 AM Central Standard Time, Isablcorky(at)aol.com writes:>Very good point !! Another consideration might be to alter the size of the aft gusset of the rib that is at the inboard end of the aileron cut out. Or, you could just install the extended gusset while you are building the ribs, which would mean you have a R/H and a L/H rib in that location. Build new rib jig, so that the gussets and the upright x next to the spars, are spaced 28 1/16" to 28 1/8" apart. This should be the exact dimention between the spars, with the exception of the 3 center ribs, and the outboard ribs where the struts attach. These locations have 1/8" plywood doublerson each side of the spar. On my Model A Radiator installation, I used the center section of the wing, forward of the front spar, and designed so as to allow the top of the radiator to be within the wing. Two 1/8" plywood L.E. ribs were spaced evenlybetween, and paralell to, R1 and L1. These ribs will accept the 1/16" plywoodL.E. (on top), and the 1/32" plywood (within the radiator cavity). I had the radiator custom built so the top tank was inside the wing, out of the prop slipstream, and it was the width of the cabanes, and extended down about 12", soyou could see under the radiator. Hinges are numbered 1 thru 6, beginning on the left wing tip. Lots of places on the wing needed to be drilled using Granpap's hand crank drill (chordless !!), because of clearance reasons. Cable guide blocks were numbered 1 thru 8, starting at the top left. Jury strut C/L is 37" outboard of C/L of cabane strut attachments. I estimated the placement of the jury strut attachments by referring to the pictureof the Pietenpol on the 1999 I A M Union Calender. The 1/8" Plywood doublers, located at the center section and the lift strut attachments, should have Spaded Ends (football shaped). These doublers bring the width of the spar to the plans width of 1", and allow the plans dimentions to be used for all the fittings.Chuck G.________________________________________________________________________________