Original Posted By: Michael D Cuy
In Pietenpol's Builder's manual it mentions thatPietenpol did incorporate washout in his wings- about3/8" to 1/2" as I recall from the literature. ________________________________________________________________________________
Pietenpol-List: Washout
Pietenpol-List: Re: Washout
Original Posted By: Michael D Cuy
what is washout? or where can I look to learn aboutwashout?---Michael D Cuy wrote:>> In Pietenpol's Builder's manual it mentions that> Pietenpol did incorporate washout in his wings- about> 3/8" to 1/2" as I recall from the literature. > > ________________________________________________________________________________
what is washout? or where can I look to learn aboutwashout?---Michael D Cuy wrote:>> In Pietenpol's Builder's manual it mentions that> Pietenpol did incorporate washout in his wings- about> 3/8" to 1/2" as I recall from the literature. > > ________________________________________________________________________________
Pietenpol-List: Re: Washout
Original Posted By: mbell1(at)columbiaenergygroup.com
>what is washout? or where can I look to learn about>washout?If you rig your Piet wing with both the rear strut and front strut being exactly the same length, then pictureadding a small amount of length to the rear strut, itwould push the last few ribs towards the rear of the wingby the aileron UP. If you have an adjustable rearstrut you can rig the wing flat, then turn that fork endout a few threads until you get 3/8" or 1/2" washout orupward bend out towards the aileron. Cubs have it, Champs have it, etc....We setup the Piet perfectly level then took a longlevel on it to get the wing level or flat out by the liftstrut attatch points, then taped a 3/8" diam. bolt tothe TOP of the level. When you hold that up againstthe bottom of the wing the level will be off by 3/8" so you crank out that adjustable fork end fitting on the rearstrut until the level comes back to neutral, and whala, you have 3/8" wash out at the tip. We used I think thethird rib in from the end to make our leveling and washoutmeasurements from. Another handy rigging tool is a magnetic/plastic facedangle finder device which has a pointer that always seeksstraight up or straight down, and tells you how many degreesyou are on any given part. We strapped this angle finder(found at your hardware/Wal-Mart, etc. stores for under15$...maybe even 7 or 8) to a long straight edge for things like wing dihedral measurements, or washout.________________________________________________________________________________
>what is washout? or where can I look to learn about>washout?If you rig your Piet wing with both the rear strut and front strut being exactly the same length, then pictureadding a small amount of length to the rear strut, itwould push the last few ribs towards the rear of the wingby the aileron UP. If you have an adjustable rearstrut you can rig the wing flat, then turn that fork endout a few threads until you get 3/8" or 1/2" washout orupward bend out towards the aileron. Cubs have it, Champs have it, etc....We setup the Piet perfectly level then took a longlevel on it to get the wing level or flat out by the liftstrut attatch points, then taped a 3/8" diam. bolt tothe TOP of the level. When you hold that up againstthe bottom of the wing the level will be off by 3/8" so you crank out that adjustable fork end fitting on the rearstrut until the level comes back to neutral, and whala, you have 3/8" wash out at the tip. We used I think thethird rib in from the end to make our leveling and washoutmeasurements from. Another handy rigging tool is a magnetic/plastic facedangle finder device which has a pointer that always seeksstraight up or straight down, and tells you how many degreesyou are on any given part. We strapped this angle finder(found at your hardware/Wal-Mart, etc. stores for under15$...maybe even 7 or 8) to a long straight edge for things like wing dihedral measurements, or washout.________________________________________________________________________________
Pietenpol-List: Re: Washout
Original Posted By: Greg Cardinal
Washout is a little twist to the wing, downward at the leading edge at thetis, that reduces the angle of incidence at the wing tips. By reducing this,the wing tips will tend to stall later than the root and will allow theailerons to remain effective when you begin to stall.Washin is just the reverse and would tend to cause your plane to spin in astall since the ailerons will have lost control already. This might be goodfor an aerobatc plane, but I don't think that a Piet falls into thiscategory.Which brings up another question. Has anyone spin tested their Piet? If so,please tell us about it.Thanks,Mike BellColumbia, SCMaiser(at)adena.byu.edu on 09/13/99 10:20:31 AMPlease respond to piet(at)byu.edu @ INTERNETcc:Subject: Pietenpol-List: Re: Washoutwhat is washout? or where can I look to learn aboutwashout?---Michael D Cuy wrote:>> In Pietenpol's Builder's manual it mentions that> Pietenpol did incorporate washout in his wings- about> 3/8" to 1/2" as I recall from the literature.>>________________________________________________________________________________
Washout is a little twist to the wing, downward at the leading edge at thetis, that reduces the angle of incidence at the wing tips. By reducing this,the wing tips will tend to stall later than the root and will allow theailerons to remain effective when you begin to stall.Washin is just the reverse and would tend to cause your plane to spin in astall since the ailerons will have lost control already. This might be goodfor an aerobatc plane, but I don't think that a Piet falls into thiscategory.Which brings up another question. Has anyone spin tested their Piet? If so,please tell us about it.Thanks,Mike BellColumbia, SCMaiser(at)adena.byu.edu on 09/13/99 10:20:31 AMPlease respond to piet(at)byu.edu @ INTERNETcc:Subject: Pietenpol-List: Re: Washoutwhat is washout? or where can I look to learn aboutwashout?---Michael D Cuy wrote:>> In Pietenpol's Builder's manual it mentions that> Pietenpol did incorporate washout in his wings- about> 3/8" to 1/2" as I recall from the literature.>>________________________________________________________________________________
Pietenpol-List: Re: Washout
Original Posted By: Larry Neal
The book 'Composite Construction for Homebuilt Aircraft' by Jack Lambie, is a really good book on composites, but it also has MUCH info on aerodynamics, construction, maintenance, repair,and How-To and design information. On page 31 it has illustrations of 5 different wing planforms, and shows the stall progression of each type. The first is the rectangle wing - safe stall pattern. The stall begins on the inboard section, and progresses outboard. Because of this pattern, Washout is not needed on a hershybar wing planform.Chuck Gantzer________________________________________________________________________________
The book 'Composite Construction for Homebuilt Aircraft' by Jack Lambie, is a really good book on composites, but it also has MUCH info on aerodynamics, construction, maintenance, repair,and How-To and design information. On page 31 it has illustrations of 5 different wing planforms, and shows the stall progression of each type. The first is the rectangle wing - safe stall pattern. The stall begins on the inboard section, and progresses outboard. Because of this pattern, Washout is not needed on a hershybar wing planform.Chuck Gantzer________________________________________________________________________________
Pietenpol-List: Re: Washout
Original Posted By: Pat Panzera
how I understand itslightly less angle of attack at wings tip. As air speed reduces andnear stall, loss of liftbegins at wing root yet outer wing is the last area to lose lift andaileron control.rob fawcettdel magsam wrote:> what is washout? or where can I look to learn about> washout?>> ---Michael D Cuy wrote:> >> > In Pietenpol's Builder's manual it mentions that> > Pietenpol did incorporate washout in his wings- about> > 3/8" to 1/2" as I recall from the literature.> >> >>> ________________________________________________________________________________
how I understand itslightly less angle of attack at wings tip. As air speed reduces andnear stall, loss of liftbegins at wing root yet outer wing is the last area to lose lift andaileron control.rob fawcettdel magsam wrote:> what is washout? or where can I look to learn about> washout?>> ---Michael D Cuy wrote:> >> > In Pietenpol's Builder's manual it mentions that> > Pietenpol did incorporate washout in his wings- about> > 3/8" to 1/2" as I recall from the literature.> >> >>> ________________________________________________________________________________
Pietenpol-List: Re: Washout
Original Posted By: nle97(at)juno.com
Washout out means to decrease the angle of incidence of a wing whereaswashin means to increase the angle of incidence. On a Cessna 100 seriesairplane the adjustment is made at the aft spar attachment bolt to thefuselage, all the way inboard. Angle of incidence is very similiar toangle of attack except that angle of incidence is set by a mechanic orbuilder and cannot be changed in flight. The pilot contols angle ofattack with the stick, throotle, or trim.John Langstonwrites:>how I understand it>slightly less angle of attack at wings tip. As air speed reduces and>near stall, loss of lift>begins at wing root yet outer wing is the last area to lose lift and>aileron control.>rob fawcett>>del magsam wrote:>>> what is washout? or where can I look to learn about>> washout?>>>> ---Michael D Cuy wrote:>> >>> > In Pietenpol's Builder's manual it mentions that>> > Pietenpol did incorporate washout in his wings- about>> > 3/8" to 1/2" as I recall from the literature.>> >>> >>>>> >__________________________________________________________________________________________
Washout out means to decrease the angle of incidence of a wing whereaswashin means to increase the angle of incidence. On a Cessna 100 seriesairplane the adjustment is made at the aft spar attachment bolt to thefuselage, all the way inboard. Angle of incidence is very similiar toangle of attack except that angle of incidence is set by a mechanic orbuilder and cannot be changed in flight. The pilot contols angle ofattack with the stick, throotle, or trim.John Langstonwrites:>how I understand it>slightly less angle of attack at wings tip. As air speed reduces and>near stall, loss of lift>begins at wing root yet outer wing is the last area to lose lift and>aileron control.>rob fawcett>>del magsam wrote:>>> what is washout? or where can I look to learn about>> washout?>>>> ---Michael D Cuy wrote:>> >>> > In Pietenpol's Builder's manual it mentions that>> > Pietenpol did incorporate washout in his wings- about>> > 3/8" to 1/2" as I recall from the literature.>> >>> >>>>> >__________________________________________________________________________________________